esp-idf/examples/system/light_sleep/main/uart_wakeup.c

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2022-01-11 22:03:38 -05:00
/*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Unlicense OR CC0-1.0
*/
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_check.h"
#include "esp_sleep.h"
#include "soc/uart_pins.h"
#include "driver/uart.h"
#include "driver/gpio.h"
#define EXAMPLE_UART_NUM 0
/* Notice that ESP32 has to use the iomux input to configure uart as wakeup source
* Please use 'UxRXD_GPIO_NUM' as uart rx pin. No limitation to the other target */
#define EXAMPLE_UART_TX_IO_NUM U0TXD_GPIO_NUM
#define EXAMPLE_UART_RX_IO_NUM U0RXD_GPIO_NUM
#define EXAMPLE_UART_WAKEUP_THRESHOLD 3
#define EXAMPLE_READ_BUF_SIZE 1024
#define EXAMPLE_UART_BUF_SIZE (EXAMPLE_READ_BUF_SIZE * 2)
static const char *TAG = "uart_wakeup";
static QueueHandle_t uart_evt_que = NULL;
static void uart_wakeup_task(void *arg)
{
uart_event_t event;
if (uart_evt_que == NULL) {
ESP_LOGE(TAG, "uart_evt_que is NULL");
abort();
}
uint8_t* dtmp = (uint8_t*) malloc(EXAMPLE_READ_BUF_SIZE);
while(1) {
// Waiting for UART event.
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);
switch(event.type) {
case UART_DATA:
ESP_LOGI(TAG, "[UART DATA]: %d", event.size);
uart_read_bytes(EXAMPLE_UART_NUM, dtmp, event.size, portMAX_DELAY);
ESP_LOGI(TAG, "[DATA EVT]:");
uart_write_bytes(EXAMPLE_UART_NUM, (const char *)dtmp, event.size);
break;
// Event of HW FIFO overflow detected
case UART_FIFO_OVF:
ESP_LOGI(TAG, "hw fifo overflow");
// If fifo overflow happened, you should consider adding flow control for your application.
// The ISR has already reset the rx FIFO,
// As an example, we directly flush the rx buffer here in order to read more data.
uart_flush_input(EXAMPLE_UART_NUM);
xQueueReset(uart_evt_que);
break;
// Event of UART ring buffer full
case UART_BUFFER_FULL:
ESP_LOGI(TAG, "ring buffer full");
// If buffer full happened, you should consider encreasing your buffer size
// As an example, we directly flush the rx buffer here in order to read more data.
uart_flush_input(EXAMPLE_UART_NUM);
xQueueReset(uart_evt_que);
break;
// Event of UART RX break detected
case UART_BREAK:
ESP_LOGI(TAG, "uart rx break");
break;
// Event of UART parity check error
case UART_PARITY_ERR:
ESP_LOGI(TAG, "uart parity error");
break;
// Event of UART frame error
case UART_FRAME_ERR:
ESP_LOGI(TAG, "uart frame error");
break;
// ESP32 can wakeup by uart but there is no wake up interrupt
#if SOC_UART_SUPPORT_WAKEUP_INT
// Event of waking up by UART
case UART_WAKEUP:
ESP_LOGI(TAG, "uart wakeup");
break;
#endif
default:
ESP_LOGI(TAG, "uart event type: %d", event.type);
break;
}
}
}
free(dtmp);
vTaskDelete(NULL);
}
static esp_err_t uart_initialization(void)
{
uart_config_t uart_cfg = {
.baud_rate = 115200,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
.source_clk = UART_SCLK_APB,
};
//Install UART driver, and get the queue.
ESP_RETURN_ON_ERROR(uart_driver_install(EXAMPLE_UART_NUM, EXAMPLE_UART_BUF_SIZE, EXAMPLE_UART_BUF_SIZE, 20, &uart_evt_que, 0),
TAG, "Install uart failed");
ESP_RETURN_ON_ERROR(uart_param_config(EXAMPLE_UART_NUM, &uart_cfg), TAG, "Configure uart param failed");
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),
TAG, "Configure uart gpio pins failed");
return ESP_OK;
}
static esp_err_t uart_wakeup_config(void)
{
/* UART will wakeup the chip up from light sleep if the edges that RX pin received has reached the threshold
* Besides, the Rx pin need extra configuration to enable it can work during light sleep */
ESP_RETURN_ON_ERROR(gpio_sleep_set_direction(EXAMPLE_UART_RX_IO_NUM, GPIO_MODE_INPUT), TAG, "Set uart sleep gpio failed");
ESP_RETURN_ON_ERROR(gpio_sleep_set_pull_mode(EXAMPLE_UART_RX_IO_NUM, GPIO_PULLUP_ONLY), TAG, "Set uart sleep gpio failed");
ESP_RETURN_ON_ERROR(uart_set_wakeup_threshold(EXAMPLE_UART_NUM, EXAMPLE_UART_WAKEUP_THRESHOLD),
TAG, "Set uart wakeup threshold failed");
/* Only uart0 and uart1 (if has) support to be configured as wakeup source */
ESP_RETURN_ON_ERROR(esp_sleep_enable_uart_wakeup(EXAMPLE_UART_NUM),
TAG, "Configure uart as wakeup source failed");
return ESP_OK;
}
esp_err_t example_register_uart_wakeup(void)
{
/* Initialize uart1 */
ESP_RETURN_ON_ERROR(uart_initialization(), TAG, "Initialize uart%d failed", EXAMPLE_UART_NUM);
/* Enable wakeup from uart */
ESP_RETURN_ON_ERROR(uart_wakeup_config(), TAG, "Configure uart as wakeup source failed");
xTaskCreate(uart_wakeup_task, "uart_wakeup_task", 4096, NULL, 5, NULL);
ESP_LOGI(TAG, "uart wakeup source is ready");
return ESP_OK;
}