circuitpython/ports/esp32/uart.c

105 lines
3.5 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 "soc/uart_periph.h"
#include "py/runtime.h"
#include "py/mphal.h"
#include "uart.h"
STATIC void uart_irq_handler(void *arg);
void uart_stdout_init(void) {
uart_config_t uartcfg = {
.baud_rate = MICROPY_HW_UART_REPL_BAUD,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.rx_flow_ctrl_thresh = 0
};
uart_param_config(MICROPY_HW_UART_REPL, &uartcfg);
const uint32_t rxbuf = 129; // IDF requires > 128 min
const uint32_t txbuf = 0;
uart_driver_install(MICROPY_HW_UART_REPL, rxbuf, txbuf, 0, NULL, 0);
uart_isr_handle_t handle;
uart_isr_free(MICROPY_HW_UART_REPL);
uart_isr_register(MICROPY_HW_UART_REPL, uart_irq_handler, NULL, ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM, &handle);
uart_enable_rx_intr(MICROPY_HW_UART_REPL);
}
int uart_stdout_tx_strn(const char *str, size_t len) {
size_t remaining = len;
// TODO add a timeout
for (;;) {
int ret = uart_tx_chars(MICROPY_HW_UART_REPL, str, remaining);
if (ret == -1) {
return -1;
}
remaining -= ret;
if (remaining <= 0) {
break;
}
str += ret;
ulTaskNotifyTake(pdFALSE, 1);
}
return len - remaining;
}
// 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;
#if CONFIG_IDF_TARGET_ESP32S3
uart->int_clr.rxfifo_full_int_clr = 1;
uart->int_clr.rxfifo_tout_int_clr = 1;
#else
uart->int_clr.rxfifo_full = 1;
uart->int_clr.rxfifo_tout = 1;
uart->int_clr.frm_err = 1;
#endif
while (uart->status.rxfifo_cnt) {
#if CONFIG_IDF_TARGET_ESP32
uint8_t c = uart->fifo.rw_byte;
#elif CONFIG_IDF_TARGET_ESP32C3 || CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
uint8_t c = READ_PERI_REG(UART_FIFO_AHB_REG(0)); // UART0
#endif
if (c == mp_interrupt_char) {
mp_sched_keyboard_interrupt();
} else {
// this is an inline function so will be in IRAM
ringbuf_put(&stdin_ringbuf, c);
}
}
}