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Add USART support, connected to stdio for REPL.

osx
Damien 2013-10-26 18:01:48 +01:00
parent 9281cd66c9
commit 8f7491a109
7 changed files with 2057 additions and 13 deletions
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2
stm/Makefile
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@ -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 \

1487
stm/lib/stm32f4xx_usart.c 100644
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431
stm/lib/stm32f4xx_usart.h 100644
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@ -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
*
* <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
*
* 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****/

57
stm/main.c
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@ -5,6 +5,7 @@
#include <stm32f4xx_tim.h>
#include <stm32f4xx_pwr.h>
#include <stm32f4xx_rtc.h>
#include <stm32f4xx_usart.h>
#include <stm_misc.h>
#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);
}

12
stm/printf.c
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@ -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);
}
}

74
stm/usart.c 100644
View File

@ -0,0 +1,74 @@
#include <stm32f4xx_rcc.h>
#include <stm32f4xx_gpio.h>
#include <stm32f4xx_usart.h>
#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);
}
}

7
stm/usart.h 100644
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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);