kopia lustrzana https://github.com/espressif/esp-idf
145 wiersze
6.1 KiB
C
145 wiersze
6.1 KiB
C
/*
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* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_check.h"
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#include "esp_sleep.h"
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#include "soc/uart_pins.h"
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#include "driver/uart.h"
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#include "driver/gpio.h"
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#include "sdkconfig.h"
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#define EXAMPLE_UART_NUM 0
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/* Notice that ESP32 has to use the iomux input to configure uart as wakeup source
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* Please use 'UxRXD_GPIO_NUM' as uart rx pin. No limitation to the other target */
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#define EXAMPLE_UART_TX_IO_NUM U0TXD_GPIO_NUM
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#define EXAMPLE_UART_RX_IO_NUM U0RXD_GPIO_NUM
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#define EXAMPLE_UART_WAKEUP_THRESHOLD 3
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#define EXAMPLE_READ_BUF_SIZE 1024
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#define EXAMPLE_UART_BUF_SIZE (EXAMPLE_READ_BUF_SIZE * 2)
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static const char *TAG = "uart_wakeup";
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static QueueHandle_t uart_evt_que = NULL;
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static void uart_wakeup_task(void *arg)
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{
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uart_event_t event;
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if (uart_evt_que == NULL) {
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ESP_LOGE(TAG, "uart_evt_que is NULL");
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abort();
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}
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uint8_t* dtmp = (uint8_t*) malloc(EXAMPLE_READ_BUF_SIZE);
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while(1) {
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// Waiting for UART event.
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if(xQueueReceive(uart_evt_que, (void * )&event, (TickType_t)portMAX_DELAY)) {
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ESP_LOGI(TAG, "uart%d recved event:%d", EXAMPLE_UART_NUM, event.type);
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switch(event.type) {
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case UART_DATA:
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ESP_LOGI(TAG, "[UART DATA]: %d", event.size);
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uart_read_bytes(EXAMPLE_UART_NUM, dtmp, event.size, portMAX_DELAY);
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ESP_LOGI(TAG, "[DATA EVT]:");
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uart_write_bytes(EXAMPLE_UART_NUM, (const char *)dtmp, event.size);
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break;
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// Event of HW FIFO overflow detected
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case UART_FIFO_OVF:
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ESP_LOGI(TAG, "hw fifo overflow");
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// If fifo overflow happened, you should consider adding flow control for your application.
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// The ISR has already reset the rx FIFO,
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// As an example, we directly flush the rx buffer here in order to read more data.
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uart_flush_input(EXAMPLE_UART_NUM);
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xQueueReset(uart_evt_que);
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break;
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// Event of UART ring buffer full
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case UART_BUFFER_FULL:
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ESP_LOGI(TAG, "ring buffer full");
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// If buffer full happened, you should consider encreasing your buffer size
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// As an example, we directly flush the rx buffer here in order to read more data.
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uart_flush_input(EXAMPLE_UART_NUM);
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xQueueReset(uart_evt_que);
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break;
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// Event of UART RX break detected
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case UART_BREAK:
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ESP_LOGI(TAG, "uart rx break");
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break;
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// Event of UART parity check error
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case UART_PARITY_ERR:
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ESP_LOGI(TAG, "uart parity error");
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break;
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// Event of UART frame error
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case UART_FRAME_ERR:
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ESP_LOGI(TAG, "uart frame error");
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break;
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// ESP32 can wakeup by uart but there is no wake up interrupt
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#if SOC_UART_SUPPORT_WAKEUP_INT
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// Event of waking up by UART
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case UART_WAKEUP:
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ESP_LOGI(TAG, "uart wakeup");
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break;
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#endif
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default:
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ESP_LOGI(TAG, "uart event type: %d", event.type);
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break;
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}
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}
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}
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free(dtmp);
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vTaskDelete(NULL);
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}
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static esp_err_t uart_initialization(void)
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{
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uart_config_t uart_cfg = {
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.baud_rate = CONFIG_ESP_CONSOLE_UART_BAUDRATE,
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.data_bits = UART_DATA_8_BITS,
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.parity = UART_PARITY_DISABLE,
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.stop_bits = UART_STOP_BITS_1,
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.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
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.source_clk = UART_SCLK_DEFAULT,
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};
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//Install UART driver, and get the queue.
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ESP_RETURN_ON_ERROR(uart_driver_install(EXAMPLE_UART_NUM, EXAMPLE_UART_BUF_SIZE, EXAMPLE_UART_BUF_SIZE, 20, &uart_evt_que, 0),
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TAG, "Install uart failed");
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if (EXAMPLE_UART_NUM == CONFIG_ESP_CONSOLE_UART_NUM) {
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/* temp fix for uart garbled output, can be removed when IDF-5683 done */
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ESP_RETURN_ON_ERROR(uart_wait_tx_idle_polling(EXAMPLE_UART_NUM), TAG, "Wait uart tx done failed");
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}
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ESP_RETURN_ON_ERROR(uart_param_config(EXAMPLE_UART_NUM, &uart_cfg), TAG, "Configure uart param failed");
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ESP_RETURN_ON_ERROR(uart_set_pin(EXAMPLE_UART_NUM, EXAMPLE_UART_TX_IO_NUM, EXAMPLE_UART_RX_IO_NUM, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE),
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TAG, "Configure uart gpio pins failed");
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return ESP_OK;
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}
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static esp_err_t uart_wakeup_config(void)
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{
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/* UART will wakeup the chip up from light sleep if the edges that RX pin received has reached the threshold
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* Besides, the Rx pin need extra configuration to enable it can work during light sleep */
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ESP_RETURN_ON_ERROR(gpio_sleep_set_direction(EXAMPLE_UART_RX_IO_NUM, GPIO_MODE_INPUT), TAG, "Set uart sleep gpio failed");
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ESP_RETURN_ON_ERROR(gpio_sleep_set_pull_mode(EXAMPLE_UART_RX_IO_NUM, GPIO_PULLUP_ONLY), TAG, "Set uart sleep gpio failed");
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ESP_RETURN_ON_ERROR(uart_set_wakeup_threshold(EXAMPLE_UART_NUM, EXAMPLE_UART_WAKEUP_THRESHOLD),
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TAG, "Set uart wakeup threshold failed");
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/* Only uart0 and uart1 (if has) support to be configured as wakeup source */
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ESP_RETURN_ON_ERROR(esp_sleep_enable_uart_wakeup(EXAMPLE_UART_NUM),
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TAG, "Configure uart as wakeup source failed");
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return ESP_OK;
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}
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esp_err_t example_register_uart_wakeup(void)
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{
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/* Initialize uart1 */
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ESP_RETURN_ON_ERROR(uart_initialization(), TAG, "Initialize uart%d failed", EXAMPLE_UART_NUM);
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/* Enable wakeup from uart */
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ESP_RETURN_ON_ERROR(uart_wakeup_config(), TAG, "Configure uart as wakeup source failed");
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xTaskCreate(uart_wakeup_task, "uart_wakeup_task", 4096, NULL, 5, NULL);
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ESP_LOGI(TAG, "uart wakeup source is ready");
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return ESP_OK;
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}
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