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/*
* 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 "py/runtime.h"
#include "py/mphal.h"
#include "uart.h"
#if MICROPY_HW_ENABLE_UART_REPL
#include <stdio.h>
#include "driver/uart.h" // For uart_get_sclk_freq()
#include "hal/uart_hal.h"
STATIC void uart_irq_handler(void *arg);
// Declaring the HAL structure on the stack saves a tiny amount of static RAM
#define REPL_HAL_DEFN() { .dev = UART_LL_GET_HW(MICROPY_HW_UART_REPL) }
// RXFIFO Full interrupt threshold. Set the same as the ESP-IDF UART driver
#define RXFIFO_FULL_THR (SOC_UART_FIFO_LEN - 8)
// RXFIFO RX timeout threshold. This is in bit periods, so 10==one byte. Same as ESP-IDF UART driver.
#define RXFIFO_RX_TIMEOUT (10)
void uart_stdout_init(void) {
uart_hal_context_t repl_hal = REPL_HAL_DEFN();
#if ESP_IDF_VERSION < ESP_IDF_VERSION_VAL(5, 3, 0)
uart_sclk_t sclk;
#else
soc_module_clk_t sclk;
#endif
uint32_t sclk_freq;
uart_hal_get_sclk(&repl_hal, &sclk); // To restore SCLK after uart_hal_init() resets it
ESP_ERROR_CHECK(uart_get_sclk_freq(sclk, &sclk_freq));
uart_hal_init(&repl_hal, MICROPY_HW_UART_REPL); // Sets defaults: 8n1, no flow control
uart_hal_set_sclk(&repl_hal, sclk);
uart_hal_set_baudrate(&repl_hal, MICROPY_HW_UART_REPL_BAUD, sclk_freq);
uart_hal_rxfifo_rst(&repl_hal);
uart_hal_txfifo_rst(&repl_hal);
ESP_ERROR_CHECK(
esp_intr_alloc(uart_periph_signal[MICROPY_HW_UART_REPL].irq,
ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM,
uart_irq_handler,
NULL,
NULL)
);
// Enable RX interrupts
uart_hal_set_rxfifo_full_thr(&repl_hal, RXFIFO_FULL_THR);
uart_hal_set_rx_timeout(&repl_hal, RXFIFO_RX_TIMEOUT);
uart_hal_ena_intr_mask(&repl_hal, UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT);
}
int uart_stdout_tx_strn(const char *str, size_t len) {
uart_hal_context_t repl_hal = REPL_HAL_DEFN();
size_t remaining = len;
uint32_t written = 0;
// TODO add a timeout
for (;;) {
uart_hal_write_txfifo(&repl_hal, (const void *)str, remaining, &written);
if (written >= remaining) {
break;
}
remaining -= written;
str += written;
ulTaskNotifyTake(pdFALSE, 1);
}
return len;
}
// 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) {
uint8_t rbuf[SOC_UART_FIFO_LEN];
int len;
uart_hal_context_t repl_hal = REPL_HAL_DEFN();
uart_hal_clr_intsts_mask(&repl_hal, UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT | UART_INTR_FRAM_ERR);
len = uart_hal_get_rxfifo_len(&repl_hal);
uart_hal_read_rxfifo(&repl_hal, rbuf, &len);
for (int i = 0; i < len; i++) {
if (rbuf[i] == mp_interrupt_char) {
mp_sched_keyboard_interrupt();
} else {
// this is an inline function so will be in IRAM
ringbuf_put(&stdin_ringbuf, rbuf[i]);
}
}
}
#endif // MICROPY_HW_ENABLE_UART_REPL
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