circuitpython/ports/esp32/uart.c

60 lines
2.2 KiB
C

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* Development of the code in this file was sponsored by Microbric Pty Ltd
*
* The MIT License (MIT)
*
* Copyright (c) 2016 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 <stdio.h>
#include "driver/uart.h"
#include "py/runtime.h"
#include "py/mphal.h"
STATIC void uart_irq_handler(void *arg);
void uart_init(void) {
uart_isr_handle_t handle;
uart_isr_register(UART_NUM_0, uart_irq_handler, NULL, ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM, &handle);
uart_enable_rx_intr(UART_NUM_0);
}
// all code executed in ISR must be in IRAM, and any const data must be in DRAM
STATIC void IRAM_ATTR uart_irq_handler(void *arg) {
volatile uart_dev_t *uart = &UART0;
uart->int_clr.rxfifo_full = 1;
uart->int_clr.frm_err = 1;
uart->int_clr.rxfifo_tout = 1;
while (uart->status.rxfifo_cnt) {
uint8_t c = uart->fifo.rw_byte;
if (c == mp_interrupt_char) {
mp_keyboard_interrupt();
} else {
// this is an inline function so will be in IRAM
ringbuf_put(&stdin_ringbuf, c);
}
}
}