125 lines
4.3 KiB
C
125 lines
4.3 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* Development of the code in this file was sponsored by Microbric Pty Ltd
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2016 Damien P. George
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/runtime.h"
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#include "py/mphal.h"
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#include "uart.h"
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#if MICROPY_HW_ENABLE_UART_REPL
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#include <stdio.h>
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#include "hal/uart_hal.h"
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// Backwards compatibility for when MICROPY_HW_UART_REPL was a ESP-IDF UART
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// driver enum. Only UART_NUM_0 was supported with that version of the driver.
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#define UART_NUM_0 0
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STATIC void uart_irq_handler(void *arg);
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// Declaring the HAL structure on the stack saves a tiny amount of static RAM
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#define REPL_HAL_DEFN() { .dev = UART_LL_GET_HW(MICROPY_HW_UART_REPL) }
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// RXFIFO Full interrupt threshold. Set the same as the ESP-IDF UART driver
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#define RXFIFO_FULL_THR (SOC_UART_FIFO_LEN - 8)
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// RXFIFO RX timeout threshold. This is in bit periods, so 10==one byte. Same as ESP-IDF UART driver.
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#define RXFIFO_RX_TIMEOUT (10)
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void uart_stdout_init(void) {
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uart_hal_context_t repl_hal = REPL_HAL_DEFN();
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uint32_t sclk_freq;
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#if UART_SCLK_DEFAULT == SOC_MOD_CLK_APB
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sclk_freq = APB_CLK_FREQ; // Assumes no frequency scaling
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#else
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// ESP32-H2 and ESP32-C2, I think
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#error "This SoC uses a different default UART SCLK source, code needs updating."
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#endif
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uart_hal_init(&repl_hal, MICROPY_HW_UART_REPL); // Sets defaults: 8n1, no flow control
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uart_hal_set_baudrate(&repl_hal, MICROPY_HW_UART_REPL_BAUD, sclk_freq);
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uart_hal_rxfifo_rst(&repl_hal);
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uart_hal_txfifo_rst(&repl_hal);
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ESP_ERROR_CHECK(
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esp_intr_alloc(uart_periph_signal[MICROPY_HW_UART_REPL].irq,
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ESP_INTR_FLAG_LOWMED | ESP_INTR_FLAG_IRAM,
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uart_irq_handler,
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NULL,
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NULL)
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);
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// Enable RX interrupts
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uart_hal_set_rxfifo_full_thr(&repl_hal, RXFIFO_FULL_THR);
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uart_hal_set_rx_timeout(&repl_hal, RXFIFO_RX_TIMEOUT);
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uart_hal_ena_intr_mask(&repl_hal, UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT);
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}
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int uart_stdout_tx_strn(const char *str, size_t len) {
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uart_hal_context_t repl_hal = REPL_HAL_DEFN();
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size_t remaining = len;
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uint32_t written = 0;
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// TODO add a timeout
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for (;;) {
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uart_hal_write_txfifo(&repl_hal, (const void *)str, remaining, &written);
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if (written >= remaining) {
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break;
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}
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remaining -= written;
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str += written;
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ulTaskNotifyTake(pdFALSE, 1);
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}
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return len;
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}
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// all code executed in ISR must be in IRAM, and any const data must be in DRAM
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STATIC void IRAM_ATTR uart_irq_handler(void *arg) {
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uint8_t rbuf[SOC_UART_FIFO_LEN];
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int len;
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uart_hal_context_t repl_hal = REPL_HAL_DEFN();
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uart_hal_clr_intsts_mask(&repl_hal, UART_INTR_RXFIFO_FULL | UART_INTR_RXFIFO_TOUT | UART_INTR_FRAM_ERR);
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len = uart_hal_get_rxfifo_len(&repl_hal);
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uart_hal_read_rxfifo(&repl_hal, rbuf, &len);
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for (int i = 0; i < len; i++) {
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if (rbuf[i] == mp_interrupt_char) {
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mp_sched_keyboard_interrupt();
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} else {
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// this is an inline function so will be in IRAM
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ringbuf_put(&stdin_ringbuf, rbuf[i]);
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}
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}
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}
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#endif // MICROPY_HW_ENABLE_UART_REPL
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