micropython/ports/samd/mphalport.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2019 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/mpstate.h"
#include "py/mphal.h"
#include "lib/utils/interrupt_char.h"
#include "samd_soc.h"
#include "tusb.h"
#if MICROPY_KBD_EXCEPTION
void tud_cdc_rx_wanted_cb(uint8_t itf, char wanted_char) {
(void)itf;
(void)wanted_char;
tud_cdc_read_char(); // discard interrupt char
mp_keyboard_interrupt();
}
void mp_hal_set_interrupt_char(int c) {
if (c != -1) {
mp_obj_exception_clear_traceback(MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)));
}
tud_cdc_set_wanted_char(c);
}
void mp_keyboard_interrupt(void) {
MP_STATE_VM(mp_pending_exception) = MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception));
#if MICROPY_ENABLE_SCHEDULER
if (MP_STATE_VM(sched_state) == MP_SCHED_IDLE) {
MP_STATE_VM(sched_state) = MP_SCHED_PENDING;
}
#endif
}
#endif
void mp_hal_delay_ms(mp_uint_t ms) {
ms += 1;
uint32_t t0 = systick_ms;
while (systick_ms - t0 < ms) {
MICROPY_EVENT_POLL_HOOK
}
}
void mp_hal_delay_us(mp_uint_t us) {
uint32_t ms = us / 1000 + 1;
uint32_t t0 = systick_ms;
while (systick_ms - t0 < ms) {
__WFI();
}
}
int mp_hal_stdin_rx_chr(void) {
for (;;) {
if (USARTx->USART.INTFLAG.bit.RXC) {
return USARTx->USART.DATA.bit.DATA;
}
if (tud_cdc_connected() && tud_cdc_available()) {
uint8_t buf[1];
uint32_t count = tud_cdc_read(buf, sizeof(buf));
if (count) {
return buf[0];
}
}
__WFI();
}
}
void mp_hal_stdout_tx_strn(const char *str, mp_uint_t len) {
if (tud_cdc_connected()) {
for (size_t i = 0; i < len;) {
uint32_t n = len - i;
uint32_t n2 = tud_cdc_write(str + i, n);
if (n2 < n) {
while (!tud_cdc_write_flush()) {
__WFI();
}
}
i += n2;
}
while (!tud_cdc_write_flush()) {
__WFI();
}
}
while (len--) {
while (!(USARTx->USART.INTFLAG.bit.DRE)) { }
USARTx->USART.DATA.bit.DATA = *str++;
}
}