diff --git a/stm/Makefile b/stm/Makefile
index cf4ba8690..8a1980a9d 100644
--- a/stm/Makefile
+++ b/stm/Makefile
@@ -23,6 +23,7 @@ SRC_C = \
malloc0.c \
systick.c \
stm32fxxx_it.c \
+ usart.c \
usb.c \
sdio.c \
lexerstm.c \
@@ -66,6 +67,7 @@ SRC_STM = \
stm32f4xx_sdio.c \
stm32f4xx_pwr.c \
stm32f4xx_rtc.c \
+ stm32f4xx_usart.c \
stm_misc.c \
usb_core.c \
usb_dcd.c \
diff --git a/stm/lib/stm32f4xx_usart.c b/stm/lib/stm32f4xx_usart.c
new file mode 100644
index 000000000..bf9f4d737
--- /dev/null
+++ b/stm/lib/stm32f4xx_usart.c
@@ -0,0 +1,1487 @@
+/**
+ ******************************************************************************
+ * @file stm32f4xx_usart.c
+ * @author MCD Application Team
+ * @version V1.1.0
+ * @date 11-January-2013
+ * @brief This file provides firmware functions to manage the following
+ * functionalities of the Universal synchronous asynchronous receiver
+ * transmitter (USART):
+ * + Initialization and Configuration
+ * + Data transfers
+ * + Multi-Processor Communication
+ * + LIN mode
+ * + Half-duplex mode
+ * + Smartcard mode
+ * + IrDA mode
+ * + DMA transfers management
+ * + Interrupts and flags management
+ *
+ @verbatim
+ ===============================================================================
+ ##### How to use this driver #####
+ ===============================================================================
+ [..]
+ (#) Enable peripheral clock using the following functions
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USARTx, ENABLE) for USART1 and USART6
+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_USARTx, ENABLE) for USART2, USART3,
+ UART4 or UART5.
+
+ (#) According to the USART mode, enable the GPIO clocks using
+ RCC_AHB1PeriphClockCmd() function. (The I/O can be TX, RX, CTS,
+ or/and SCLK).
+
+ (#) Peripheral's alternate function:
+ (++) Connect the pin to the desired peripherals' Alternate
+ Function (AF) using GPIO_PinAFConfig() function
+ (++) Configure the desired pin in alternate function by:
+ GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
+ (++) Select the type, pull-up/pull-down and output speed via
+ GPIO_PuPd, GPIO_OType and GPIO_Speed members
+ (++) Call GPIO_Init() function
+
+ (#) Program the Baud Rate, Word Length , Stop Bit, Parity, Hardware
+ flow control and Mode(Receiver/Transmitter) using the USART_Init()
+ function.
+
+ (#) For synchronous mode, enable the clock and program the polarity,
+ phase and last bit using the USART_ClockInit() function.
+
+ (#) Enable the NVIC and the corresponding interrupt using the function
+ USART_ITConfig() if you need to use interrupt mode.
+
+ (#) When using the DMA mode
+ (++) Configure the DMA using DMA_Init() function
+ (++) Active the needed channel Request using USART_DMACmd() function
+
+ (#) Enable the USART using the USART_Cmd() function.
+
+ (#) Enable the DMA using the DMA_Cmd() function, when using DMA mode.
+
+ -@- Refer to Multi-Processor, LIN, half-duplex, Smartcard, IrDA sub-sections
+ for more details
+
+ [..]
+ In order to reach higher communication baudrates, it is possible to
+ enable the oversampling by 8 mode using the function USART_OverSampling8Cmd().
+ This function should be called after enabling the USART clock (RCC_APBxPeriphClockCmd())
+ and before calling the function USART_Init().
+
+ @endverbatim
+ ******************************************************************************
+ * @attention
+ *
+ *
© COPYRIGHT 2013 STMicroelectronics
+ *
+ * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.st.com/software_license_agreement_liberty_v2
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************
+ */
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f4xx_conf.h"
+#include "stm32f4xx_usart.h"
+#include "stm32f4xx_rcc.h"
+
+/** @addtogroup STM32F4xx_StdPeriph_Driver
+ * @{
+ */
+
+/** @defgroup USART
+ * @brief USART driver modules
+ * @{
+ */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+
+/*!< USART CR1 register clear Mask ((~(uint16_t)0xE9F3)) */
+#define CR1_CLEAR_MASK ((uint16_t)(USART_CR1_M | USART_CR1_PCE | \
+ USART_CR1_PS | USART_CR1_TE | \
+ USART_CR1_RE))
+
+/*!< USART CR2 register clock bits clear Mask ((~(uint16_t)0xF0FF)) */
+#define CR2_CLOCK_CLEAR_MASK ((uint16_t)(USART_CR2_CLKEN | USART_CR2_CPOL | \
+ USART_CR2_CPHA | USART_CR2_LBCL))
+
+/*!< USART CR3 register clear Mask ((~(uint16_t)0xFCFF)) */
+#define CR3_CLEAR_MASK ((uint16_t)(USART_CR3_RTSE | USART_CR3_CTSE))
+
+/*!< USART Interrupts mask */
+#define IT_MASK ((uint16_t)0x001F)
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup USART_Private_Functions
+ * @{
+ */
+
+/** @defgroup USART_Group1 Initialization and Configuration functions
+ * @brief Initialization and Configuration functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Initialization and Configuration functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to initialize the USART
+ in asynchronous and in synchronous modes.
+ (+) For the asynchronous mode only these parameters can be configured:
+ (++) Baud Rate
+ (++) Word Length
+ (++) Stop Bit
+ (++) Parity: If the parity is enabled, then the MSB bit of the data written
+ in the data register is transmitted but is changed by the parity bit.
+ Depending on the frame length defined by the M bit (8-bits or 9-bits),
+ the possible USART frame formats are as listed in the following table:
+ +-------------------------------------------------------------+
+ | M bit | PCE bit | USART frame |
+ |---------------------|---------------------------------------|
+ | 0 | 0 | | SB | 8 bit data | STB | |
+ |---------|-----------|---------------------------------------|
+ | 0 | 1 | | SB | 7 bit data | PB | STB | |
+ |---------|-----------|---------------------------------------|
+ | 1 | 0 | | SB | 9 bit data | STB | |
+ |---------|-----------|---------------------------------------|
+ | 1 | 1 | | SB | 8 bit data | PB | STB | |
+ +-------------------------------------------------------------+
+ (++) Hardware flow control
+ (++) Receiver/transmitter modes
+
+ [..]
+ The USART_Init() function follows the USART asynchronous configuration
+ procedure (details for the procedure are available in reference manual (RM0090)).
+
+ (+) For the synchronous mode in addition to the asynchronous mode parameters these
+ parameters should be also configured:
+ (++) USART Clock Enabled
+ (++) USART polarity
+ (++) USART phase
+ (++) USART LastBit
+
+ [..]
+ These parameters can be configured using the USART_ClockInit() function.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Deinitializes the USARTx peripheral registers to their default reset values.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @retval None
+ */
+void USART_DeInit(USART_TypeDef* USARTx)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ if (USARTx == USART1)
+ {
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
+ }
+ else if (USARTx == USART2)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
+ }
+ else if (USARTx == USART3)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
+ }
+ else if (USARTx == UART4)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
+ }
+ else if (USARTx == UART5)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
+ }
+ else if (USARTx == USART6)
+ {
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, ENABLE);
+ RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART6, DISABLE);
+ }
+ else if (USARTx == UART7)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART7, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART7, DISABLE);
+ }
+ else
+ {
+ if (USARTx == UART8)
+ {
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART8, ENABLE);
+ RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART8, DISABLE);
+ }
+ }
+}
+
+/**
+ * @brief Initializes the USARTx peripheral according to the specified
+ * parameters in the USART_InitStruct .
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_InitStruct: pointer to a USART_InitTypeDef structure that contains
+ * the configuration information for the specified USART peripheral.
+ * @retval None
+ */
+void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct)
+{
+ uint32_t tmpreg = 0x00, apbclock = 0x00;
+ uint32_t integerdivider = 0x00;
+ uint32_t fractionaldivider = 0x00;
+ RCC_ClocksTypeDef RCC_ClocksStatus;
+
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_BAUDRATE(USART_InitStruct->USART_BaudRate));
+ assert_param(IS_USART_WORD_LENGTH(USART_InitStruct->USART_WordLength));
+ assert_param(IS_USART_STOPBITS(USART_InitStruct->USART_StopBits));
+ assert_param(IS_USART_PARITY(USART_InitStruct->USART_Parity));
+ assert_param(IS_USART_MODE(USART_InitStruct->USART_Mode));
+ assert_param(IS_USART_HARDWARE_FLOW_CONTROL(USART_InitStruct->USART_HardwareFlowControl));
+
+ /* The hardware flow control is available only for USART1, USART2, USART3 and USART6 */
+ if (USART_InitStruct->USART_HardwareFlowControl != USART_HardwareFlowControl_None)
+ {
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ }
+
+/*---------------------------- USART CR2 Configuration -----------------------*/
+ tmpreg = USARTx->CR2;
+
+ /* Clear STOP[13:12] bits */
+ tmpreg &= (uint32_t)~((uint32_t)USART_CR2_STOP);
+
+ /* Configure the USART Stop Bits, Clock, CPOL, CPHA and LastBit :
+ Set STOP[13:12] bits according to USART_StopBits value */
+ tmpreg |= (uint32_t)USART_InitStruct->USART_StopBits;
+
+ /* Write to USART CR2 */
+ USARTx->CR2 = (uint16_t)tmpreg;
+
+/*---------------------------- USART CR1 Configuration -----------------------*/
+ tmpreg = USARTx->CR1;
+
+ /* Clear M, PCE, PS, TE and RE bits */
+ tmpreg &= (uint32_t)~((uint32_t)CR1_CLEAR_MASK);
+
+ /* Configure the USART Word Length, Parity and mode:
+ Set the M bits according to USART_WordLength value
+ Set PCE and PS bits according to USART_Parity value
+ Set TE and RE bits according to USART_Mode value */
+ tmpreg |= (uint32_t)USART_InitStruct->USART_WordLength | USART_InitStruct->USART_Parity |
+ USART_InitStruct->USART_Mode;
+
+ /* Write to USART CR1 */
+ USARTx->CR1 = (uint16_t)tmpreg;
+
+/*---------------------------- USART CR3 Configuration -----------------------*/
+ tmpreg = USARTx->CR3;
+
+ /* Clear CTSE and RTSE bits */
+ tmpreg &= (uint32_t)~((uint32_t)CR3_CLEAR_MASK);
+
+ /* Configure the USART HFC :
+ Set CTSE and RTSE bits according to USART_HardwareFlowControl value */
+ tmpreg |= USART_InitStruct->USART_HardwareFlowControl;
+
+ /* Write to USART CR3 */
+ USARTx->CR3 = (uint16_t)tmpreg;
+
+/*---------------------------- USART BRR Configuration -----------------------*/
+ /* Configure the USART Baud Rate */
+ RCC_GetClocksFreq(&RCC_ClocksStatus);
+
+ if ((USARTx == USART1) || (USARTx == USART6))
+ {
+ apbclock = RCC_ClocksStatus.PCLK2_Frequency;
+ }
+ else
+ {
+ apbclock = RCC_ClocksStatus.PCLK1_Frequency;
+ }
+
+ /* Determine the integer part */
+ if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
+ {
+ /* Integer part computing in case Oversampling mode is 8 Samples */
+ integerdivider = ((25 * apbclock) / (2 * (USART_InitStruct->USART_BaudRate)));
+ }
+ else /* if ((USARTx->CR1 & USART_CR1_OVER8) == 0) */
+ {
+ /* Integer part computing in case Oversampling mode is 16 Samples */
+ integerdivider = ((25 * apbclock) / (4 * (USART_InitStruct->USART_BaudRate)));
+ }
+ tmpreg = (integerdivider / 100) << 4;
+
+ /* Determine the fractional part */
+ fractionaldivider = integerdivider - (100 * (tmpreg >> 4));
+
+ /* Implement the fractional part in the register */
+ if ((USARTx->CR1 & USART_CR1_OVER8) != 0)
+ {
+ tmpreg |= ((((fractionaldivider * 8) + 50) / 100)) & ((uint8_t)0x07);
+ }
+ else /* if ((USARTx->CR1 & USART_CR1_OVER8) == 0) */
+ {
+ tmpreg |= ((((fractionaldivider * 16) + 50) / 100)) & ((uint8_t)0x0F);
+ }
+
+ /* Write to USART BRR register */
+ USARTx->BRR = (uint16_t)tmpreg;
+}
+
+/**
+ * @brief Fills each USART_InitStruct member with its default value.
+ * @param USART_InitStruct: pointer to a USART_InitTypeDef structure which will
+ * be initialized.
+ * @retval None
+ */
+void USART_StructInit(USART_InitTypeDef* USART_InitStruct)
+{
+ /* USART_InitStruct members default value */
+ USART_InitStruct->USART_BaudRate = 9600;
+ USART_InitStruct->USART_WordLength = USART_WordLength_8b;
+ USART_InitStruct->USART_StopBits = USART_StopBits_1;
+ USART_InitStruct->USART_Parity = USART_Parity_No ;
+ USART_InitStruct->USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+ USART_InitStruct->USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+}
+
+/**
+ * @brief Initializes the USARTx peripheral Clock according to the
+ * specified parameters in the USART_ClockInitStruct .
+ * @param USARTx: where x can be 1, 2, 3 or 6 to select the USART peripheral.
+ * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef structure that
+ * contains the configuration information for the specified USART peripheral.
+ * @note The Smart Card and Synchronous modes are not available for UART4 and UART5.
+ * @retval None
+ */
+void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct)
+{
+ uint32_t tmpreg = 0x00;
+ /* Check the parameters */
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ assert_param(IS_USART_CLOCK(USART_ClockInitStruct->USART_Clock));
+ assert_param(IS_USART_CPOL(USART_ClockInitStruct->USART_CPOL));
+ assert_param(IS_USART_CPHA(USART_ClockInitStruct->USART_CPHA));
+ assert_param(IS_USART_LASTBIT(USART_ClockInitStruct->USART_LastBit));
+
+/*---------------------------- USART CR2 Configuration -----------------------*/
+ tmpreg = USARTx->CR2;
+ /* Clear CLKEN, CPOL, CPHA and LBCL bits */
+ tmpreg &= (uint32_t)~((uint32_t)CR2_CLOCK_CLEAR_MASK);
+ /* Configure the USART Clock, CPOL, CPHA and LastBit ------------*/
+ /* Set CLKEN bit according to USART_Clock value */
+ /* Set CPOL bit according to USART_CPOL value */
+ /* Set CPHA bit according to USART_CPHA value */
+ /* Set LBCL bit according to USART_LastBit value */
+ tmpreg |= (uint32_t)USART_ClockInitStruct->USART_Clock | USART_ClockInitStruct->USART_CPOL |
+ USART_ClockInitStruct->USART_CPHA | USART_ClockInitStruct->USART_LastBit;
+ /* Write to USART CR2 */
+ USARTx->CR2 = (uint16_t)tmpreg;
+}
+
+/**
+ * @brief Fills each USART_ClockInitStruct member with its default value.
+ * @param USART_ClockInitStruct: pointer to a USART_ClockInitTypeDef structure
+ * which will be initialized.
+ * @retval None
+ */
+void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct)
+{
+ /* USART_ClockInitStruct members default value */
+ USART_ClockInitStruct->USART_Clock = USART_Clock_Disable;
+ USART_ClockInitStruct->USART_CPOL = USART_CPOL_Low;
+ USART_ClockInitStruct->USART_CPHA = USART_CPHA_1Edge;
+ USART_ClockInitStruct->USART_LastBit = USART_LastBit_Disable;
+}
+
+/**
+ * @brief Enables or disables the specified USART peripheral.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the USARTx peripheral.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the selected USART by setting the UE bit in the CR1 register */
+ USARTx->CR1 |= USART_CR1_UE;
+ }
+ else
+ {
+ /* Disable the selected USART by clearing the UE bit in the CR1 register */
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_UE);
+ }
+}
+
+/**
+ * @brief Sets the system clock prescaler.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_Prescaler: specifies the prescaler clock.
+ * @note The function is used for IrDA mode with UART4 and UART5.
+ * @retval None
+ */
+void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ /* Clear the USART prescaler */
+ USARTx->GTPR &= USART_GTPR_GT;
+ /* Set the USART prescaler */
+ USARTx->GTPR |= USART_Prescaler;
+}
+
+/**
+ * @brief Enables or disables the USART's 8x oversampling mode.
+ * @note This function has to be called before calling USART_Init() function
+ * in order to have correct baudrate Divider value.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the USART 8x oversampling mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the 8x Oversampling mode by setting the OVER8 bit in the CR1 register */
+ USARTx->CR1 |= USART_CR1_OVER8;
+ }
+ else
+ {
+ /* Disable the 8x Oversampling mode by clearing the OVER8 bit in the CR1 register */
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_OVER8);
+ }
+}
+
+/**
+ * @brief Enables or disables the USART's one bit sampling method.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the USART one bit sampling method.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the one bit method by setting the ONEBITE bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_ONEBIT;
+ }
+ else
+ {
+ /* Disable the one bit method by clearing the ONEBITE bit in the CR3 register */
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_ONEBIT);
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group2 Data transfers functions
+ * @brief Data transfers functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Data transfers functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to manage the USART data
+ transfers.
+ [..]
+ During an USART reception, data shifts in least significant bit first through
+ the RX pin. In this mode, the USART_DR register consists of a buffer (RDR)
+ between the internal bus and the received shift register.
+ [..]
+ When a transmission is taking place, a write instruction to the USART_DR register
+ stores the data in the TDR register and which is copied in the shift register
+ at the end of the current transmission.
+ [..]
+ The read access of the USART_DR register can be done using the USART_ReceiveData()
+ function and returns the RDR buffered value. Whereas a write access to the USART_DR
+ can be done using USART_SendData() function and stores the written data into
+ TDR buffer.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Transmits single data through the USARTx peripheral.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param Data: the data to transmit.
+ * @retval None
+ */
+void USART_SendData(USART_TypeDef* USARTx, uint16_t Data)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DATA(Data));
+
+ /* Transmit Data */
+ USARTx->DR = (Data & (uint16_t)0x01FF);
+}
+
+/**
+ * @brief Returns the most recent received data by the USARTx peripheral.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @retval The received data.
+ */
+uint16_t USART_ReceiveData(USART_TypeDef* USARTx)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ /* Receive Data */
+ return (uint16_t)(USARTx->DR & (uint16_t)0x01FF);
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group3 MultiProcessor Communication functions
+ * @brief Multi-Processor Communication functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Multi-Processor Communication functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to manage the USART
+ multiprocessor communication.
+ [..]
+ For instance one of the USARTs can be the master, its TX output is connected
+ to the RX input of the other USART. The others are slaves, their respective
+ TX outputs are logically ANDed together and connected to the RX input of the
+ master.
+ [..]
+ USART multiprocessor communication is possible through the following procedure:
+ (#) Program the Baud rate, Word length = 9 bits, Stop bits, Parity, Mode
+ transmitter or Mode receiver and hardware flow control values using
+ the USART_Init() function.
+ (#) Configures the USART address using the USART_SetAddress() function.
+ (#) Configures the wake up method (USART_WakeUp_IdleLine or USART_WakeUp_AddressMark)
+ using USART_WakeUpConfig() function only for the slaves.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Enter the USART slaves in mute mode using USART_ReceiverWakeUpCmd() function.
+ [..]
+ The USART Slave exit from mute mode when receive the wake up condition.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Sets the address of the USART node.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_Address: Indicates the address of the USART node.
+ * @retval None
+ */
+void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_ADDRESS(USART_Address));
+
+ /* Clear the USART address */
+ USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_ADD);
+ /* Set the USART address node */
+ USARTx->CR2 |= USART_Address;
+}
+
+/**
+ * @brief Determines if the USART is in mute mode or not.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the USART mute mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the USART mute mode by setting the RWU bit in the CR1 register */
+ USARTx->CR1 |= USART_CR1_RWU;
+ }
+ else
+ {
+ /* Disable the USART mute mode by clearing the RWU bit in the CR1 register */
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_RWU);
+ }
+}
+/**
+ * @brief Selects the USART WakeUp method.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_WakeUp: specifies the USART wakeup method.
+ * This parameter can be one of the following values:
+ * @arg USART_WakeUp_IdleLine: WakeUp by an idle line detection
+ * @arg USART_WakeUp_AddressMark: WakeUp by an address mark
+ * @retval None
+ */
+void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_WAKEUP(USART_WakeUp));
+
+ USARTx->CR1 &= (uint16_t)~((uint16_t)USART_CR1_WAKE);
+ USARTx->CR1 |= USART_WakeUp;
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group4 LIN mode functions
+ * @brief LIN mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### LIN mode functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to manage the USART LIN
+ Mode communication.
+ [..]
+ In LIN mode, 8-bit data format with 1 stop bit is required in accordance with
+ the LIN standard.
+ [..]
+ Only this LIN Feature is supported by the USART IP:
+ (+) LIN Master Synchronous Break send capability and LIN slave break detection
+ capability : 13-bit break generation and 10/11 bit break detection
+
+ [..]
+ USART LIN Master transmitter communication is possible through the following
+ procedure:
+ (#) Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
+ Mode transmitter or Mode receiver and hardware flow control values using
+ the USART_Init() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Enable the LIN mode using the USART_LINCmd() function.
+ (#) Send the break character using USART_SendBreak() function.
+ [..]
+ USART LIN Master receiver communication is possible through the following procedure:
+ (#) Program the Baud rate, Word length = 8bits, Stop bits = 1bit, Parity,
+ Mode transmitter or Mode receiver and hardware flow control values using
+ the USART_Init() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Configures the break detection length using the USART_LINBreakDetectLengthConfig()
+ function.
+ (#) Enable the LIN mode using the USART_LINCmd() function.
+
+ -@- In LIN mode, the following bits must be kept cleared:
+ (+@) CLKEN in the USART_CR2 register,
+ (+@) STOP[1:0], SCEN, HDSEL and IREN in the USART_CR3 register.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Sets the USART LIN Break detection length.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_LINBreakDetectLength: specifies the LIN break detection length.
+ * This parameter can be one of the following values:
+ * @arg USART_LINBreakDetectLength_10b: 10-bit break detection
+ * @arg USART_LINBreakDetectLength_11b: 11-bit break detection
+ * @retval None
+ */
+void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_LIN_BREAK_DETECT_LENGTH(USART_LINBreakDetectLength));
+
+ USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LBDL);
+ USARTx->CR2 |= USART_LINBreakDetectLength;
+}
+
+/**
+ * @brief Enables or disables the USART's LIN mode.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the USART LIN mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the LIN mode by setting the LINEN bit in the CR2 register */
+ USARTx->CR2 |= USART_CR2_LINEN;
+ }
+ else
+ {
+ /* Disable the LIN mode by clearing the LINEN bit in the CR2 register */
+ USARTx->CR2 &= (uint16_t)~((uint16_t)USART_CR2_LINEN);
+ }
+}
+
+/**
+ * @brief Transmits break characters.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @retval None
+ */
+void USART_SendBreak(USART_TypeDef* USARTx)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+
+ /* Send break characters */
+ USARTx->CR1 |= USART_CR1_SBK;
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group5 Halfduplex mode function
+ * @brief Half-duplex mode function
+ *
+@verbatim
+ ===============================================================================
+ ##### Half-duplex mode function #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to manage the USART
+ Half-duplex communication.
+ [..]
+ The USART can be configured to follow a single-wire half-duplex protocol where
+ the TX and RX lines are internally connected.
+ [..]
+ USART Half duplex communication is possible through the following procedure:
+ (#) Program the Baud rate, Word length, Stop bits, Parity, Mode transmitter
+ or Mode receiver and hardware flow control values using the USART_Init()
+ function.
+ (#) Configures the USART address using the USART_SetAddress() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Enable the half duplex mode using USART_HalfDuplexCmd() function.
+
+
+ -@- The RX pin is no longer used
+ -@- In Half-duplex mode the following bits must be kept cleared:
+ (+@) LINEN and CLKEN bits in the USART_CR2 register.
+ (+@) SCEN and IREN bits in the USART_CR3 register.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the USART's Half Duplex communication.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the USART Communication.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the Half-Duplex mode by setting the HDSEL bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_HDSEL;
+ }
+ else
+ {
+ /* Disable the Half-Duplex mode by clearing the HDSEL bit in the CR3 register */
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_HDSEL);
+ }
+}
+
+/**
+ * @}
+ */
+
+
+/** @defgroup USART_Group6 Smartcard mode functions
+ * @brief Smartcard mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Smartcard mode functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to manage the USART
+ Smartcard communication.
+ [..]
+ The Smartcard interface is designed to support asynchronous protocol Smartcards as
+ defined in the ISO 7816-3 standard.
+ [..]
+ The USART can provide a clock to the smartcard through the SCLK output.
+ In smartcard mode, SCLK is not associated to the communication but is simply derived
+ from the internal peripheral input clock through a 5-bit prescaler.
+ [..]
+ Smartcard communication is possible through the following procedure:
+ (#) Configures the Smartcard Prescaler using the USART_SetPrescaler() function.
+ (#) Configures the Smartcard Guard Time using the USART_SetGuardTime() function.
+ (#) Program the USART clock using the USART_ClockInit() function as following:
+ (++) USART Clock enabled
+ (++) USART CPOL Low
+ (++) USART CPHA on first edge
+ (++) USART Last Bit Clock Enabled
+ (#) Program the Smartcard interface using the USART_Init() function as following:
+ (++) Word Length = 9 Bits
+ (++) 1.5 Stop Bit
+ (++) Even parity
+ (++) BaudRate = 12096 baud
+ (++) Hardware flow control disabled (RTS and CTS signals)
+ (++) Tx and Rx enabled
+ (#) POptionally you can enable the parity error interrupt using the USART_ITConfig()
+ function
+ (#) PEnable the USART using the USART_Cmd() function.
+ (#) PEnable the Smartcard NACK using the USART_SmartCardNACKCmd() function.
+ (#) PEnable the Smartcard interface using the USART_SmartCardCmd() function.
+
+ Please refer to the ISO 7816-3 specification for more details.
+
+ -@- It is also possible to choose 0.5 stop bit for receiving but it is recommended
+ to use 1.5 stop bits for both transmitting and receiving to avoid switching
+ between the two configurations.
+ -@- In smartcard mode, the following bits must be kept cleared:
+ (+@) LINEN bit in the USART_CR2 register.
+ (+@) HDSEL and IREN bits in the USART_CR3 register.
+ -@- Smartcard mode is available on USART peripherals only (not available on UART4
+ and UART5 peripherals).
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Sets the specified USART guard time.
+ * @param USARTx: where x can be 1, 2, 3 or 6 to select the USART or
+ * UART peripheral.
+ * @param USART_GuardTime: specifies the guard time.
+ * @retval None
+ */
+void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+
+ /* Clear the USART Guard time */
+ USARTx->GTPR &= USART_GTPR_PSC;
+ /* Set the USART guard time */
+ USARTx->GTPR |= (uint16_t)((uint16_t)USART_GuardTime << 0x08);
+}
+
+/**
+ * @brief Enables or disables the USART's Smart Card mode.
+ * @param USARTx: where x can be 1, 2, 3 or 6 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the Smart Card mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the SC mode by setting the SCEN bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_SCEN;
+ }
+ else
+ {
+ /* Disable the SC mode by clearing the SCEN bit in the CR3 register */
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_SCEN);
+ }
+}
+
+/**
+ * @brief Enables or disables NACK transmission.
+ * @param USARTx: where x can be 1, 2, 3 or 6 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the NACK transmission.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+ if (NewState != DISABLE)
+ {
+ /* Enable the NACK transmission by setting the NACK bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_NACK;
+ }
+ else
+ {
+ /* Disable the NACK transmission by clearing the NACK bit in the CR3 register */
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_NACK);
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group7 IrDA mode functions
+ * @brief IrDA mode functions
+ *
+@verbatim
+ ===============================================================================
+ ##### IrDA mode functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to manage the USART
+ IrDA communication.
+ [..]
+ IrDA is a half duplex communication protocol. If the Transmitter is busy, any data
+ on the IrDA receive line will be ignored by the IrDA decoder and if the Receiver
+ is busy, data on the TX from the USART to IrDA will not be encoded by IrDA.
+ While receiving data, transmission should be avoided as the data to be transmitted
+ could be corrupted.
+ [..]
+ IrDA communication is possible through the following procedure:
+ (#) Program the Baud rate, Word length = 8 bits, Stop bits, Parity, Transmitter/Receiver
+ modes and hardware flow control values using the USART_Init() function.
+ (#) Enable the USART using the USART_Cmd() function.
+ (#) Configures the IrDA pulse width by configuring the prescaler using
+ the USART_SetPrescaler() function.
+ (#) Configures the IrDA USART_IrDAMode_LowPower or USART_IrDAMode_Normal mode
+ using the USART_IrDAConfig() function.
+ (#) Enable the IrDA using the USART_IrDACmd() function.
+
+ -@- A pulse of width less than two and greater than one PSC period(s) may or may
+ not be rejected.
+ -@- The receiver set up time should be managed by software. The IrDA physical layer
+ specification specifies a minimum of 10 ms delay between transmission and
+ reception (IrDA is a half duplex protocol).
+ -@- In IrDA mode, the following bits must be kept cleared:
+ (+@) LINEN, STOP and CLKEN bits in the USART_CR2 register.
+ (+@) SCEN and HDSEL bits in the USART_CR3 register.
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Configures the USART's IrDA interface.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_IrDAMode: specifies the IrDA mode.
+ * This parameter can be one of the following values:
+ * @arg USART_IrDAMode_LowPower
+ * @arg USART_IrDAMode_Normal
+ * @retval None
+ */
+void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_IRDA_MODE(USART_IrDAMode));
+
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IRLP);
+ USARTx->CR3 |= USART_IrDAMode;
+}
+
+/**
+ * @brief Enables or disables the USART's IrDA interface.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param NewState: new state of the IrDA mode.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the IrDA mode by setting the IREN bit in the CR3 register */
+ USARTx->CR3 |= USART_CR3_IREN;
+ }
+ else
+ {
+ /* Disable the IrDA mode by clearing the IREN bit in the CR3 register */
+ USARTx->CR3 &= (uint16_t)~((uint16_t)USART_CR3_IREN);
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group8 DMA transfers management functions
+ * @brief DMA transfers management functions
+ *
+@verbatim
+ ===============================================================================
+ ##### DMA transfers management functions #####
+ ===============================================================================
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the USART's DMA interface.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_DMAReq: specifies the DMA request.
+ * This parameter can be any combination of the following values:
+ * @arg USART_DMAReq_Tx: USART DMA transmit request
+ * @arg USART_DMAReq_Rx: USART DMA receive request
+ * @param NewState: new state of the DMA Request sources.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_DMAREQ(USART_DMAReq));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ if (NewState != DISABLE)
+ {
+ /* Enable the DMA transfer for selected requests by setting the DMAT and/or
+ DMAR bits in the USART CR3 register */
+ USARTx->CR3 |= USART_DMAReq;
+ }
+ else
+ {
+ /* Disable the DMA transfer for selected requests by clearing the DMAT and/or
+ DMAR bits in the USART CR3 register */
+ USARTx->CR3 &= (uint16_t)~USART_DMAReq;
+ }
+}
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Group9 Interrupts and flags management functions
+ * @brief Interrupts and flags management functions
+ *
+@verbatim
+ ===============================================================================
+ ##### Interrupts and flags management functions #####
+ ===============================================================================
+ [..]
+ This subsection provides a set of functions allowing to configure the USART
+ Interrupts sources, DMA channels requests and check or clear the flags or
+ pending bits status.
+ The user should identify which mode will be used in his application to manage
+ the communication: Polling mode, Interrupt mode or DMA mode.
+
+ *** Polling Mode ***
+ ====================
+ [..]
+ In Polling Mode, the SPI communication can be managed by 10 flags:
+ (#) USART_FLAG_TXE : to indicate the status of the transmit buffer register
+ (#) USART_FLAG_RXNE : to indicate the status of the receive buffer register
+ (#) USART_FLAG_TC : to indicate the status of the transmit operation
+ (#) USART_FLAG_IDLE : to indicate the status of the Idle Line
+ (#) USART_FLAG_CTS : to indicate the status of the nCTS input
+ (#) USART_FLAG_LBD : to indicate the status of the LIN break detection
+ (#) USART_FLAG_NE : to indicate if a noise error occur
+ (#) USART_FLAG_FE : to indicate if a frame error occur
+ (#) USART_FLAG_PE : to indicate if a parity error occur
+ (#) USART_FLAG_ORE : to indicate if an Overrun error occur
+ [..]
+ In this Mode it is advised to use the following functions:
+ (+) FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);
+ (+) void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);
+
+ *** Interrupt Mode ***
+ ======================
+ [..]
+ In Interrupt Mode, the USART communication can be managed by 8 interrupt sources
+ and 10 pending bits:
+
+ (#) Pending Bits:
+
+ (##) USART_IT_TXE : to indicate the status of the transmit buffer register
+ (##) USART_IT_RXNE : to indicate the status of the receive buffer register
+ (##) USART_IT_TC : to indicate the status of the transmit operation
+ (##) USART_IT_IDLE : to indicate the status of the Idle Line
+ (##) USART_IT_CTS : to indicate the status of the nCTS input
+ (##) USART_IT_LBD : to indicate the status of the LIN break detection
+ (##) USART_IT_NE : to indicate if a noise error occur
+ (##) USART_IT_FE : to indicate if a frame error occur
+ (##) USART_IT_PE : to indicate if a parity error occur
+ (##) USART_IT_ORE : to indicate if an Overrun error occur
+
+ (#) Interrupt Source:
+
+ (##) USART_IT_TXE : specifies the interrupt source for the Tx buffer empty
+ interrupt.
+ (##) USART_IT_RXNE : specifies the interrupt source for the Rx buffer not
+ empty interrupt.
+ (##) USART_IT_TC : specifies the interrupt source for the Transmit complete
+ interrupt.
+ (##) USART_IT_IDLE : specifies the interrupt source for the Idle Line interrupt.
+ (##) USART_IT_CTS : specifies the interrupt source for the CTS interrupt.
+ (##) USART_IT_LBD : specifies the interrupt source for the LIN break detection
+ interrupt.
+ (##) USART_IT_PE : specifies the interrupt source for the parity error interrupt.
+ (##) USART_IT_ERR : specifies the interrupt source for the errors interrupt.
+
+ -@@- Some parameters are coded in order to use them as interrupt source
+ or as pending bits.
+ [..]
+ In this Mode it is advised to use the following functions:
+ (+) void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
+ (+) ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);
+ (+) void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);
+
+ *** DMA Mode ***
+ ================
+ [..]
+ In DMA Mode, the USART communication can be managed by 2 DMA Channel requests:
+ (#) USART_DMAReq_Tx: specifies the Tx buffer DMA transfer request
+ (#) USART_DMAReq_Rx: specifies the Rx buffer DMA transfer request
+ [..]
+ In this Mode it is advised to use the following function:
+ (+) void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);
+
+@endverbatim
+ * @{
+ */
+
+/**
+ * @brief Enables or disables the specified USART interrupts.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_IT: specifies the USART interrupt sources to be enabled or disabled.
+ * This parameter can be one of the following values:
+ * @arg USART_IT_CTS: CTS change interrupt
+ * @arg USART_IT_LBD: LIN Break detection interrupt
+ * @arg USART_IT_TXE: Transmit Data Register empty interrupt
+ * @arg USART_IT_TC: Transmission complete interrupt
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt
+ * @arg USART_IT_IDLE: Idle line detection interrupt
+ * @arg USART_IT_PE: Parity Error interrupt
+ * @arg USART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)
+ * @param NewState: new state of the specified USARTx interrupts.
+ * This parameter can be: ENABLE or DISABLE.
+ * @retval None
+ */
+void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState)
+{
+ uint32_t usartreg = 0x00, itpos = 0x00, itmask = 0x00;
+ uint32_t usartxbase = 0x00;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CONFIG_IT(USART_IT));
+ assert_param(IS_FUNCTIONAL_STATE(NewState));
+
+ /* The CTS interrupt is not available for UART4 and UART5 */
+ if (USART_IT == USART_IT_CTS)
+ {
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ }
+
+ usartxbase = (uint32_t)USARTx;
+
+ /* Get the USART register index */
+ usartreg = (((uint8_t)USART_IT) >> 0x05);
+
+ /* Get the interrupt position */
+ itpos = USART_IT & IT_MASK;
+ itmask = (((uint32_t)0x01) << itpos);
+
+ if (usartreg == 0x01) /* The IT is in CR1 register */
+ {
+ usartxbase += 0x0C;
+ }
+ else if (usartreg == 0x02) /* The IT is in CR2 register */
+ {
+ usartxbase += 0x10;
+ }
+ else /* The IT is in CR3 register */
+ {
+ usartxbase += 0x14;
+ }
+ if (NewState != DISABLE)
+ {
+ *(__IO uint32_t*)usartxbase |= itmask;
+ }
+ else
+ {
+ *(__IO uint32_t*)usartxbase &= ~itmask;
+ }
+}
+
+/**
+ * @brief Checks whether the specified USART flag is set or not.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_FLAG: specifies the flag to check.
+ * This parameter can be one of the following values:
+ * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5)
+ * @arg USART_FLAG_LBD: LIN Break detection flag
+ * @arg USART_FLAG_TXE: Transmit data register empty flag
+ * @arg USART_FLAG_TC: Transmission Complete flag
+ * @arg USART_FLAG_RXNE: Receive data register not empty flag
+ * @arg USART_FLAG_IDLE: Idle Line detection flag
+ * @arg USART_FLAG_ORE: OverRun Error flag
+ * @arg USART_FLAG_NE: Noise Error flag
+ * @arg USART_FLAG_FE: Framing Error flag
+ * @arg USART_FLAG_PE: Parity Error flag
+ * @retval The new state of USART_FLAG (SET or RESET).
+ */
+FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG)
+{
+ FlagStatus bitstatus = RESET;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_FLAG(USART_FLAG));
+
+ /* The CTS flag is not available for UART4 and UART5 */
+ if (USART_FLAG == USART_FLAG_CTS)
+ {
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ }
+
+ if ((USARTx->SR & USART_FLAG) != (uint16_t)RESET)
+ {
+ bitstatus = SET;
+ }
+ else
+ {
+ bitstatus = RESET;
+ }
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the USARTx's pending flags.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_FLAG: specifies the flag to clear.
+ * This parameter can be any combination of the following values:
+ * @arg USART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5).
+ * @arg USART_FLAG_LBD: LIN Break detection flag.
+ * @arg USART_FLAG_TC: Transmission Complete flag.
+ * @arg USART_FLAG_RXNE: Receive data register not empty flag.
+ *
+ * @note PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
+ * error) and IDLE (Idle line detected) flags are cleared by software
+ * sequence: a read operation to USART_SR register (USART_GetFlagStatus())
+ * followed by a read operation to USART_DR register (USART_ReceiveData()).
+ * @note RXNE flag can be also cleared by a read to the USART_DR register
+ * (USART_ReceiveData()).
+ * @note TC flag can be also cleared by software sequence: a read operation to
+ * USART_SR register (USART_GetFlagStatus()) followed by a write operation
+ * to USART_DR register (USART_SendData()).
+ * @note TXE flag is cleared only by a write to the USART_DR register
+ * (USART_SendData()).
+ *
+ * @retval None
+ */
+void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG)
+{
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CLEAR_FLAG(USART_FLAG));
+
+ /* The CTS flag is not available for UART4 and UART5 */
+ if ((USART_FLAG & USART_FLAG_CTS) == USART_FLAG_CTS)
+ {
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ }
+
+ USARTx->SR = (uint16_t)~USART_FLAG;
+}
+
+/**
+ * @brief Checks whether the specified USART interrupt has occurred or not.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_IT: specifies the USART interrupt source to check.
+ * This parameter can be one of the following values:
+ * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
+ * @arg USART_IT_LBD: LIN Break detection interrupt
+ * @arg USART_IT_TXE: Transmit Data Register empty interrupt
+ * @arg USART_IT_TC: Transmission complete interrupt
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt
+ * @arg USART_IT_IDLE: Idle line detection interrupt
+ * @arg USART_IT_ORE_RX : OverRun Error interrupt if the RXNEIE bit is set
+ * @arg USART_IT_ORE_ER : OverRun Error interrupt if the EIE bit is set
+ * @arg USART_IT_NE: Noise Error interrupt
+ * @arg USART_IT_FE: Framing Error interrupt
+ * @arg USART_IT_PE: Parity Error interrupt
+ * @retval The new state of USART_IT (SET or RESET).
+ */
+ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT)
+{
+ uint32_t bitpos = 0x00, itmask = 0x00, usartreg = 0x00;
+ ITStatus bitstatus = RESET;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_GET_IT(USART_IT));
+
+ /* The CTS interrupt is not available for UART4 and UART5 */
+ if (USART_IT == USART_IT_CTS)
+ {
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ }
+
+ /* Get the USART register index */
+ usartreg = (((uint8_t)USART_IT) >> 0x05);
+ /* Get the interrupt position */
+ itmask = USART_IT & IT_MASK;
+ itmask = (uint32_t)0x01 << itmask;
+
+ if (usartreg == 0x01) /* The IT is in CR1 register */
+ {
+ itmask &= USARTx->CR1;
+ }
+ else if (usartreg == 0x02) /* The IT is in CR2 register */
+ {
+ itmask &= USARTx->CR2;
+ }
+ else /* The IT is in CR3 register */
+ {
+ itmask &= USARTx->CR3;
+ }
+
+ bitpos = USART_IT >> 0x08;
+ bitpos = (uint32_t)0x01 << bitpos;
+ bitpos &= USARTx->SR;
+ if ((itmask != (uint16_t)RESET)&&(bitpos != (uint16_t)RESET))
+ {
+ bitstatus = SET;
+ }
+ else
+ {
+ bitstatus = RESET;
+ }
+
+ return bitstatus;
+}
+
+/**
+ * @brief Clears the USARTx's interrupt pending bits.
+ * @param USARTx: where x can be 1, 2, 3, 4, 5, 6, 7 or 8 to select the USART or
+ * UART peripheral.
+ * @param USART_IT: specifies the interrupt pending bit to clear.
+ * This parameter can be one of the following values:
+ * @arg USART_IT_CTS: CTS change interrupt (not available for UART4 and UART5)
+ * @arg USART_IT_LBD: LIN Break detection interrupt
+ * @arg USART_IT_TC: Transmission complete interrupt.
+ * @arg USART_IT_RXNE: Receive Data register not empty interrupt.
+ *
+ * @note PE (Parity error), FE (Framing error), NE (Noise error), ORE (OverRun
+ * error) and IDLE (Idle line detected) pending bits are cleared by
+ * software sequence: a read operation to USART_SR register
+ * (USART_GetITStatus()) followed by a read operation to USART_DR register
+ * (USART_ReceiveData()).
+ * @note RXNE pending bit can be also cleared by a read to the USART_DR register
+ * (USART_ReceiveData()).
+ * @note TC pending bit can be also cleared by software sequence: a read
+ * operation to USART_SR register (USART_GetITStatus()) followed by a write
+ * operation to USART_DR register (USART_SendData()).
+ * @note TXE pending bit is cleared only by a write to the USART_DR register
+ * (USART_SendData()).
+ *
+ * @retval None
+ */
+void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT)
+{
+ uint16_t bitpos = 0x00, itmask = 0x00;
+ /* Check the parameters */
+ assert_param(IS_USART_ALL_PERIPH(USARTx));
+ assert_param(IS_USART_CLEAR_IT(USART_IT));
+
+ /* The CTS interrupt is not available for UART4 and UART5 */
+ if (USART_IT == USART_IT_CTS)
+ {
+ assert_param(IS_USART_1236_PERIPH(USARTx));
+ }
+
+ bitpos = USART_IT >> 0x08;
+ itmask = ((uint16_t)0x01 << (uint16_t)bitpos);
+ USARTx->SR = (uint16_t)~itmask;
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/stm/lib/stm32f4xx_usart.h b/stm/lib/stm32f4xx_usart.h
new file mode 100644
index 000000000..391fe769d
--- /dev/null
+++ b/stm/lib/stm32f4xx_usart.h
@@ -0,0 +1,431 @@
+/**
+ ******************************************************************************
+ * @file stm32f4xx_usart.h
+ * @author MCD Application Team
+ * @version V1.1.0
+ * @date 11-January-2013
+ * @brief This file contains all the functions prototypes for the USART
+ * firmware library.
+ ******************************************************************************
+ * @attention
+ *
+ * © COPYRIGHT 2013 STMicroelectronics
+ *
+ * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
+ * You may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.st.com/software_license_agreement_liberty_v2
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ ******************************************************************************
+ */
+
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __STM32F4xx_USART_H
+#define __STM32F4xx_USART_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include "stm32f4xx.h"
+
+/** @addtogroup STM32F4xx_StdPeriph_Driver
+ * @{
+ */
+
+/** @addtogroup USART
+ * @{
+ */
+
+/* Exported types ------------------------------------------------------------*/
+
+/**
+ * @brief USART Init Structure definition
+ */
+
+typedef struct
+{
+ uint32_t USART_BaudRate; /*!< This member configures the USART communication baud rate.
+ The baud rate is computed using the following formula:
+ - IntegerDivider = ((PCLKx) / (8 * (OVR8+1) * (USART_InitStruct->USART_BaudRate)))
+ - FractionalDivider = ((IntegerDivider - ((u32) IntegerDivider)) * 8 * (OVR8+1)) + 0.5
+ Where OVR8 is the "oversampling by 8 mode" configuration bit in the CR1 register. */
+
+ uint16_t USART_WordLength; /*!< Specifies the number of data bits transmitted or received in a frame.
+ This parameter can be a value of @ref USART_Word_Length */
+
+ uint16_t USART_StopBits; /*!< Specifies the number of stop bits transmitted.
+ This parameter can be a value of @ref USART_Stop_Bits */
+
+ uint16_t USART_Parity; /*!< Specifies the parity mode.
+ This parameter can be a value of @ref USART_Parity
+ @note When parity is enabled, the computed parity is inserted
+ at the MSB position of the transmitted data (9th bit when
+ the word length is set to 9 data bits; 8th bit when the
+ word length is set to 8 data bits). */
+
+ uint16_t USART_Mode; /*!< Specifies wether the Receive or Transmit mode is enabled or disabled.
+ This parameter can be a value of @ref USART_Mode */
+
+ uint16_t USART_HardwareFlowControl; /*!< Specifies wether the hardware flow control mode is enabled
+ or disabled.
+ This parameter can be a value of @ref USART_Hardware_Flow_Control */
+} USART_InitTypeDef;
+
+/**
+ * @brief USART Clock Init Structure definition
+ */
+
+typedef struct
+{
+
+ uint16_t USART_Clock; /*!< Specifies whether the USART clock is enabled or disabled.
+ This parameter can be a value of @ref USART_Clock */
+
+ uint16_t USART_CPOL; /*!< Specifies the steady state of the serial clock.
+ This parameter can be a value of @ref USART_Clock_Polarity */
+
+ uint16_t USART_CPHA; /*!< Specifies the clock transition on which the bit capture is made.
+ This parameter can be a value of @ref USART_Clock_Phase */
+
+ uint16_t USART_LastBit; /*!< Specifies whether the clock pulse corresponding to the last transmitted
+ data bit (MSB) has to be output on the SCLK pin in synchronous mode.
+ This parameter can be a value of @ref USART_Last_Bit */
+} USART_ClockInitTypeDef;
+
+/* Exported constants --------------------------------------------------------*/
+
+/** @defgroup USART_Exported_Constants
+ * @{
+ */
+
+#define IS_USART_ALL_PERIPH(PERIPH) (((PERIPH) == USART1) || \
+ ((PERIPH) == USART2) || \
+ ((PERIPH) == USART3) || \
+ ((PERIPH) == UART4) || \
+ ((PERIPH) == UART5) || \
+ ((PERIPH) == USART6) || \
+ ((PERIPH) == UART7) || \
+ ((PERIPH) == UART8))
+
+#define IS_USART_1236_PERIPH(PERIPH) (((PERIPH) == USART1) || \
+ ((PERIPH) == USART2) || \
+ ((PERIPH) == USART3) || \
+ ((PERIPH) == USART6))
+
+/** @defgroup USART_Word_Length
+ * @{
+ */
+
+#define USART_WordLength_8b ((uint16_t)0x0000)
+#define USART_WordLength_9b ((uint16_t)0x1000)
+
+#define IS_USART_WORD_LENGTH(LENGTH) (((LENGTH) == USART_WordLength_8b) || \
+ ((LENGTH) == USART_WordLength_9b))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Stop_Bits
+ * @{
+ */
+
+#define USART_StopBits_1 ((uint16_t)0x0000)
+#define USART_StopBits_0_5 ((uint16_t)0x1000)
+#define USART_StopBits_2 ((uint16_t)0x2000)
+#define USART_StopBits_1_5 ((uint16_t)0x3000)
+#define IS_USART_STOPBITS(STOPBITS) (((STOPBITS) == USART_StopBits_1) || \
+ ((STOPBITS) == USART_StopBits_0_5) || \
+ ((STOPBITS) == USART_StopBits_2) || \
+ ((STOPBITS) == USART_StopBits_1_5))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Parity
+ * @{
+ */
+
+#define USART_Parity_No ((uint16_t)0x0000)
+#define USART_Parity_Even ((uint16_t)0x0400)
+#define USART_Parity_Odd ((uint16_t)0x0600)
+#define IS_USART_PARITY(PARITY) (((PARITY) == USART_Parity_No) || \
+ ((PARITY) == USART_Parity_Even) || \
+ ((PARITY) == USART_Parity_Odd))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Mode
+ * @{
+ */
+
+#define USART_Mode_Rx ((uint16_t)0x0004)
+#define USART_Mode_Tx ((uint16_t)0x0008)
+#define IS_USART_MODE(MODE) ((((MODE) & (uint16_t)0xFFF3) == 0x00) && ((MODE) != (uint16_t)0x00))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Hardware_Flow_Control
+ * @{
+ */
+#define USART_HardwareFlowControl_None ((uint16_t)0x0000)
+#define USART_HardwareFlowControl_RTS ((uint16_t)0x0100)
+#define USART_HardwareFlowControl_CTS ((uint16_t)0x0200)
+#define USART_HardwareFlowControl_RTS_CTS ((uint16_t)0x0300)
+#define IS_USART_HARDWARE_FLOW_CONTROL(CONTROL)\
+ (((CONTROL) == USART_HardwareFlowControl_None) || \
+ ((CONTROL) == USART_HardwareFlowControl_RTS) || \
+ ((CONTROL) == USART_HardwareFlowControl_CTS) || \
+ ((CONTROL) == USART_HardwareFlowControl_RTS_CTS))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Clock
+ * @{
+ */
+#define USART_Clock_Disable ((uint16_t)0x0000)
+#define USART_Clock_Enable ((uint16_t)0x0800)
+#define IS_USART_CLOCK(CLOCK) (((CLOCK) == USART_Clock_Disable) || \
+ ((CLOCK) == USART_Clock_Enable))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Clock_Polarity
+ * @{
+ */
+
+#define USART_CPOL_Low ((uint16_t)0x0000)
+#define USART_CPOL_High ((uint16_t)0x0400)
+#define IS_USART_CPOL(CPOL) (((CPOL) == USART_CPOL_Low) || ((CPOL) == USART_CPOL_High))
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Clock_Phase
+ * @{
+ */
+
+#define USART_CPHA_1Edge ((uint16_t)0x0000)
+#define USART_CPHA_2Edge ((uint16_t)0x0200)
+#define IS_USART_CPHA(CPHA) (((CPHA) == USART_CPHA_1Edge) || ((CPHA) == USART_CPHA_2Edge))
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_Last_Bit
+ * @{
+ */
+
+#define USART_LastBit_Disable ((uint16_t)0x0000)
+#define USART_LastBit_Enable ((uint16_t)0x0100)
+#define IS_USART_LASTBIT(LASTBIT) (((LASTBIT) == USART_LastBit_Disable) || \
+ ((LASTBIT) == USART_LastBit_Enable))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Interrupt_definition
+ * @{
+ */
+
+#define USART_IT_PE ((uint16_t)0x0028)
+#define USART_IT_TXE ((uint16_t)0x0727)
+#define USART_IT_TC ((uint16_t)0x0626)
+#define USART_IT_RXNE ((uint16_t)0x0525)
+#define USART_IT_ORE_RX ((uint16_t)0x0325) /* In case interrupt is generated if the RXNEIE bit is set */
+#define USART_IT_IDLE ((uint16_t)0x0424)
+#define USART_IT_LBD ((uint16_t)0x0846)
+#define USART_IT_CTS ((uint16_t)0x096A)
+#define USART_IT_ERR ((uint16_t)0x0060)
+#define USART_IT_ORE_ER ((uint16_t)0x0360) /* In case interrupt is generated if the EIE bit is set */
+#define USART_IT_NE ((uint16_t)0x0260)
+#define USART_IT_FE ((uint16_t)0x0160)
+
+/** @defgroup USART_Legacy
+ * @{
+ */
+#define USART_IT_ORE USART_IT_ORE_ER
+/**
+ * @}
+ */
+
+#define IS_USART_CONFIG_IT(IT) (((IT) == USART_IT_PE) || ((IT) == USART_IT_TXE) || \
+ ((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \
+ ((IT) == USART_IT_IDLE) || ((IT) == USART_IT_LBD) || \
+ ((IT) == USART_IT_CTS) || ((IT) == USART_IT_ERR))
+#define IS_USART_GET_IT(IT) (((IT) == USART_IT_PE) || ((IT) == USART_IT_TXE) || \
+ ((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \
+ ((IT) == USART_IT_IDLE) || ((IT) == USART_IT_LBD) || \
+ ((IT) == USART_IT_CTS) || ((IT) == USART_IT_ORE) || \
+ ((IT) == USART_IT_ORE_RX) || ((IT) == USART_IT_ORE_ER) || \
+ ((IT) == USART_IT_NE) || ((IT) == USART_IT_FE))
+#define IS_USART_CLEAR_IT(IT) (((IT) == USART_IT_TC) || ((IT) == USART_IT_RXNE) || \
+ ((IT) == USART_IT_LBD) || ((IT) == USART_IT_CTS))
+/**
+ * @}
+ */
+
+/** @defgroup USART_DMA_Requests
+ * @{
+ */
+
+#define USART_DMAReq_Tx ((uint16_t)0x0080)
+#define USART_DMAReq_Rx ((uint16_t)0x0040)
+#define IS_USART_DMAREQ(DMAREQ) ((((DMAREQ) & (uint16_t)0xFF3F) == 0x00) && ((DMAREQ) != (uint16_t)0x00))
+
+/**
+ * @}
+ */
+
+/** @defgroup USART_WakeUp_methods
+ * @{
+ */
+
+#define USART_WakeUp_IdleLine ((uint16_t)0x0000)
+#define USART_WakeUp_AddressMark ((uint16_t)0x0800)
+#define IS_USART_WAKEUP(WAKEUP) (((WAKEUP) == USART_WakeUp_IdleLine) || \
+ ((WAKEUP) == USART_WakeUp_AddressMark))
+/**
+ * @}
+ */
+
+/** @defgroup USART_LIN_Break_Detection_Length
+ * @{
+ */
+
+#define USART_LINBreakDetectLength_10b ((uint16_t)0x0000)
+#define USART_LINBreakDetectLength_11b ((uint16_t)0x0020)
+#define IS_USART_LIN_BREAK_DETECT_LENGTH(LENGTH) \
+ (((LENGTH) == USART_LINBreakDetectLength_10b) || \
+ ((LENGTH) == USART_LINBreakDetectLength_11b))
+/**
+ * @}
+ */
+
+/** @defgroup USART_IrDA_Low_Power
+ * @{
+ */
+
+#define USART_IrDAMode_LowPower ((uint16_t)0x0004)
+#define USART_IrDAMode_Normal ((uint16_t)0x0000)
+#define IS_USART_IRDA_MODE(MODE) (((MODE) == USART_IrDAMode_LowPower) || \
+ ((MODE) == USART_IrDAMode_Normal))
+/**
+ * @}
+ */
+
+/** @defgroup USART_Flags
+ * @{
+ */
+
+#define USART_FLAG_CTS ((uint16_t)0x0200)
+#define USART_FLAG_LBD ((uint16_t)0x0100)
+#define USART_FLAG_TXE ((uint16_t)0x0080)
+#define USART_FLAG_TC ((uint16_t)0x0040)
+#define USART_FLAG_RXNE ((uint16_t)0x0020)
+#define USART_FLAG_IDLE ((uint16_t)0x0010)
+#define USART_FLAG_ORE ((uint16_t)0x0008)
+#define USART_FLAG_NE ((uint16_t)0x0004)
+#define USART_FLAG_FE ((uint16_t)0x0002)
+#define USART_FLAG_PE ((uint16_t)0x0001)
+#define IS_USART_FLAG(FLAG) (((FLAG) == USART_FLAG_PE) || ((FLAG) == USART_FLAG_TXE) || \
+ ((FLAG) == USART_FLAG_TC) || ((FLAG) == USART_FLAG_RXNE) || \
+ ((FLAG) == USART_FLAG_IDLE) || ((FLAG) == USART_FLAG_LBD) || \
+ ((FLAG) == USART_FLAG_CTS) || ((FLAG) == USART_FLAG_ORE) || \
+ ((FLAG) == USART_FLAG_NE) || ((FLAG) == USART_FLAG_FE))
+
+#define IS_USART_CLEAR_FLAG(FLAG) ((((FLAG) & (uint16_t)0xFC9F) == 0x00) && ((FLAG) != (uint16_t)0x00))
+
+#define IS_USART_BAUDRATE(BAUDRATE) (((BAUDRATE) > 0) && ((BAUDRATE) < 7500001))
+#define IS_USART_ADDRESS(ADDRESS) ((ADDRESS) <= 0xF)
+#define IS_USART_DATA(DATA) ((DATA) <= 0x1FF)
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/* Exported macro ------------------------------------------------------------*/
+/* Exported functions --------------------------------------------------------*/
+
+/* Function used to set the USART configuration to the default reset state ***/
+void USART_DeInit(USART_TypeDef* USARTx);
+
+/* Initialization and Configuration functions *********************************/
+void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct);
+void USART_StructInit(USART_InitTypeDef* USART_InitStruct);
+void USART_ClockInit(USART_TypeDef* USARTx, USART_ClockInitTypeDef* USART_ClockInitStruct);
+void USART_ClockStructInit(USART_ClockInitTypeDef* USART_ClockInitStruct);
+void USART_Cmd(USART_TypeDef* USARTx, FunctionalState NewState);
+void USART_SetPrescaler(USART_TypeDef* USARTx, uint8_t USART_Prescaler);
+void USART_OverSampling8Cmd(USART_TypeDef* USARTx, FunctionalState NewState);
+void USART_OneBitMethodCmd(USART_TypeDef* USARTx, FunctionalState NewState);
+
+/* Data transfers functions ***************************************************/
+void USART_SendData(USART_TypeDef* USARTx, uint16_t Data);
+uint16_t USART_ReceiveData(USART_TypeDef* USARTx);
+
+/* Multi-Processor Communication functions ************************************/
+void USART_SetAddress(USART_TypeDef* USARTx, uint8_t USART_Address);
+void USART_WakeUpConfig(USART_TypeDef* USARTx, uint16_t USART_WakeUp);
+void USART_ReceiverWakeUpCmd(USART_TypeDef* USARTx, FunctionalState NewState);
+
+/* LIN mode functions *********************************************************/
+void USART_LINBreakDetectLengthConfig(USART_TypeDef* USARTx, uint16_t USART_LINBreakDetectLength);
+void USART_LINCmd(USART_TypeDef* USARTx, FunctionalState NewState);
+void USART_SendBreak(USART_TypeDef* USARTx);
+
+/* Half-duplex mode function **************************************************/
+void USART_HalfDuplexCmd(USART_TypeDef* USARTx, FunctionalState NewState);
+
+/* Smartcard mode functions ***************************************************/
+void USART_SmartCardCmd(USART_TypeDef* USARTx, FunctionalState NewState);
+void USART_SmartCardNACKCmd(USART_TypeDef* USARTx, FunctionalState NewState);
+void USART_SetGuardTime(USART_TypeDef* USARTx, uint8_t USART_GuardTime);
+
+/* IrDA mode functions ********************************************************/
+void USART_IrDAConfig(USART_TypeDef* USARTx, uint16_t USART_IrDAMode);
+void USART_IrDACmd(USART_TypeDef* USARTx, FunctionalState NewState);
+
+/* DMA transfers management functions *****************************************/
+void USART_DMACmd(USART_TypeDef* USARTx, uint16_t USART_DMAReq, FunctionalState NewState);
+
+/* Interrupts and flags management functions **********************************/
+void USART_ITConfig(USART_TypeDef* USARTx, uint16_t USART_IT, FunctionalState NewState);
+FlagStatus USART_GetFlagStatus(USART_TypeDef* USARTx, uint16_t USART_FLAG);
+void USART_ClearFlag(USART_TypeDef* USARTx, uint16_t USART_FLAG);
+ITStatus USART_GetITStatus(USART_TypeDef* USARTx, uint16_t USART_IT);
+void USART_ClearITPendingBit(USART_TypeDef* USARTx, uint16_t USART_IT);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __STM32F4xx_USART_H */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/stm/main.c b/stm/main.c
index ab6c12d56..47907dd5c 100644
--- a/stm/main.c
+++ b/stm/main.c
@@ -5,6 +5,7 @@
#include
#include
#include
+#include
#include
#include "std.h"
@@ -16,6 +17,7 @@
#include "lcd.h"
#include "storage.h"
#include "mma.h"
+#include "usart.h"
#include "usb.h"
#include "ff.h"
@@ -226,6 +228,23 @@ static py_obj_t pyb_info(void) {
return py_const_none;
}
+py_obj_t pyb_usart_send(py_obj_t data) {
+ usart_tx_char(py_get_int(data));
+ return py_const_none;
+}
+
+py_obj_t pyb_usart_receive(void) {
+ return py_obj_new_int(usart_rx_char());
+}
+
+py_obj_t pyb_usart_status(void) {
+ if (usart_rx_any()) {
+ return py_const_true;
+ } else {
+ return py_const_false;
+ }
+}
+
char *strdup(const char *str) {
uint32_t len = strlen(str);
char *s2 = m_new(char, len + 1);
@@ -238,21 +257,33 @@ char *strdup(const char *str) {
static const char *readline_hist[READLINE_HIST_SIZE] = {NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL};
+void stdout_tx_str(const char *str) {
+ usart_tx_str(str);
+ usb_vcp_send_str(str);
+}
+
int readline(vstr_t *line, const char *prompt) {
- usb_vcp_send_str(prompt);
+ stdout_tx_str(prompt);
int len = vstr_len(line);
int escape = 0;
int hist_num = 0;
for (;;) {
- while (usb_vcp_rx_any() == 0) {
+ char c;
+ for (;;) {
+ if (usb_vcp_rx_any() != 0) {
+ c = usb_vcp_rx_get();
+ break;
+ } else if (usart_rx_any()) {
+ c = usart_rx_char();
+ break;
+ }
sys_tick_delay_ms(1);
}
- char c = usb_vcp_rx_get();
if (escape == 0) {
if (c == 4 && vstr_len(line) == len) {
return 0;
} else if (c == '\r') {
- usb_vcp_send_str("\r\n");
+ stdout_tx_str("\r\n");
for (int i = READLINE_HIST_SIZE - 1; i > 0; i--) {
readline_hist[i] = readline_hist[i - 1];
}
@@ -263,11 +294,11 @@ int readline(vstr_t *line, const char *prompt) {
} else if (c == 127) {
if (vstr_len(line) > len) {
vstr_cut_tail(line, 1);
- usb_vcp_send_str("\b \b");
+ stdout_tx_str("\b \b");
}
} else if (32 <= c && c <= 126) {
vstr_add_char(line, c);
- usb_vcp_send_strn(&c, 1);
+ stdout_tx_str(line->buf + line->len - 1);
}
} else if (escape == 1) {
if (c == '[') {
@@ -282,13 +313,13 @@ int readline(vstr_t *line, const char *prompt) {
if (hist_num < READLINE_HIST_SIZE && readline_hist[hist_num] != NULL) {
// erase line
for (int i = line->len - len; i > 0; i--) {
- usb_vcp_send_str("\b \b");
+ stdout_tx_str("\b \b");
}
// set line to history
line->len = len;
vstr_add_str(line, readline_hist[hist_num]);
// draw line
- usb_vcp_send_str(readline_hist[hist_num]);
+ stdout_tx_str(readline_hist[hist_num]);
// increase hist num
hist_num += 1;
}
@@ -301,8 +332,8 @@ int readline(vstr_t *line, const char *prompt) {
}
void do_repl(void) {
- usb_vcp_send_str("Micro Python 0.5; STM32F405RG; PYBv2\r\n");
- usb_vcp_send_str("Type \"help\" for more information.\r\n");
+ stdout_tx_str("Micro Python 0.5; STM32F405RG; PYBv2\r\n");
+ stdout_tx_str("Type \"help\" for more information.\r\n");
vstr_t line;
vstr_init(&line);
@@ -355,7 +386,7 @@ void do_repl(void) {
}
}
- usb_vcp_send_str("\r\n");
+ stdout_tx_str("\r\n");
}
bool do_file(const char *filename) {
@@ -607,6 +638,7 @@ int main(void) {
// more sub-system init
sw_init();
storage_init();
+ usart_init();
soft_reset:
@@ -638,6 +670,9 @@ soft_reset:
rt_store_attr(m, qstr_from_str_static("mma"), rt_make_function_0(pyb_mma_read));
rt_store_attr(m, qstr_from_str_static("hid"), rt_make_function_1(pyb_hid_send_report));
rt_store_attr(m, qstr_from_str_static("time"), rt_make_function_0(pyb_rtc_read));
+ rt_store_attr(m, qstr_from_str_static("uout"), rt_make_function_1(pyb_usart_send));
+ rt_store_attr(m, qstr_from_str_static("uin"), rt_make_function_0(pyb_usart_receive));
+ rt_store_attr(m, qstr_from_str_static("ustat"), rt_make_function_0(pyb_usart_status));
rt_store_name(qstr_from_str_static("pyb"), m);
}
diff --git a/stm/printf.c b/stm/printf.c
index 4c178b94b..d3f5a4d35 100644
--- a/stm/printf.c
+++ b/stm/printf.c
@@ -3,6 +3,7 @@
#include "std.h"
#include "misc.h"
#include "lcd.h"
+#include "usart.h"
#include "usb.h"
#define PF_FLAG_LEFT_ADJUST (0x01)
@@ -213,10 +214,17 @@ int pfenv_printf(const pfenv_t *pfenv, const char *fmt, va_list args) {
}
void stdout_print_strn(void *data, const char *str, unsigned int len) {
- // send stdout to LCD and USB CDC VCP
+ // send stdout to USART, USB CDC VCP, and LCD if nothing else
+ bool any = false;
+ if (usart_is_enabled()) {
+ usart_tx_strn_cooked(str, len);
+ any = true;
+ }
if (usb_vcp_is_enabled()) {
usb_vcp_send_strn_cooked(str, len);
- } else {
+ any = true;
+ }
+ if (!any) {
lcd_print_strn(str, len);
}
}
diff --git a/stm/usart.c b/stm/usart.c
new file mode 100644
index 000000000..307aff166
--- /dev/null
+++ b/stm/usart.c
@@ -0,0 +1,74 @@
+#include
+#include
+#include
+
+#include "misc.h"
+#include "usart.h"
+
+static bool is_enabled;
+
+// USART6 on PC6 (TX), PC7 (RX)
+void usart_init(void) {
+ RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART6, ENABLE);
+
+ GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART6);
+ GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_USART6);
+
+ GPIO_InitTypeDef GPIO_InitStructure;
+ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
+ GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
+ GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
+ GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
+ GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
+ GPIO_Init(GPIOC, &GPIO_InitStructure);
+
+ USART_InitTypeDef USART_InitStructure;
+ USART_InitStructure.USART_BaudRate = 115200;
+ USART_InitStructure.USART_WordLength = USART_WordLength_8b;
+ USART_InitStructure.USART_StopBits = USART_StopBits_1;
+ USART_InitStructure.USART_Parity = USART_Parity_No;
+ USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
+ USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
+ USART_Init(USART6, &USART_InitStructure);
+
+ USART_Cmd(USART6, ENABLE);
+
+ is_enabled = true;
+}
+
+bool usart_is_enabled(void) {
+ return is_enabled;
+}
+
+bool usart_rx_any(void) {
+ return USART_GetFlagStatus(USART6, USART_FLAG_RXNE) == SET;
+}
+
+int usart_rx_char(void) {
+ return USART_ReceiveData(USART6);
+}
+
+void usart_tx_char(int c) {
+ if (is_enabled) {
+ // wait until the end of any previous transmission
+ uint32_t timeout = 100000;
+ while (USART_GetFlagStatus(USART6, USART_FLAG_TC) == RESET && --timeout > 0) {
+ }
+ USART_SendData(USART6, c);
+ }
+}
+
+void usart_tx_str(const char *str) {
+ for (; *str; str++) {
+ usart_tx_char(*str);
+ }
+}
+
+void usart_tx_strn_cooked(const char *str, int len) {
+ for (const char *top = str + len; str < top; str++) {
+ if (*str == '\n') {
+ usart_tx_char('\r');
+ }
+ usart_tx_char(*str);
+ }
+}
diff --git a/stm/usart.h b/stm/usart.h
new file mode 100644
index 000000000..9d92e59f5
--- /dev/null
+++ b/stm/usart.h
@@ -0,0 +1,7 @@
+void usart_init(void);
+bool usart_is_enabled(void);
+bool usart_rx_any(void);
+int usart_rx_char(void);
+void usart_tx_char(int c);
+void usart_tx_str(const char *str);
+void usart_tx_strn_cooked(const char *str, int len);