76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/* UART asynchronous example, that uses separate RX and TX tasks
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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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_system.h"
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#include "esp_log.h"
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#include "driver/uart.h"
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#include "soc/uart_struct.h"
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#include "string.h"
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static const int RX_BUF_SIZE = 1024;
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#define TXD_PIN (GPIO_NUM_4)
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#define RXD_PIN (GPIO_NUM_5)
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void init() {
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const uart_config_t uart_config = {
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.baud_rate = 115200,
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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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};
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uart_param_config(UART_NUM_1, &uart_config);
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uart_set_pin(UART_NUM_1, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
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// We won't use a buffer for sending data.
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uart_driver_install(UART_NUM_1, RX_BUF_SIZE * 2, 0, 0, NULL, 0);
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}
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int sendData(const char* logName, const char* data)
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{
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const int len = strlen(data);
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const int txBytes = uart_write_bytes(UART_NUM_1, data, len);
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ESP_LOGI(logName, "Wrote %d bytes", txBytes);
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return txBytes;
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}
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static void tx_task()
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{
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static const char *TX_TASK_TAG = "TX_TASK";
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esp_log_level_set(TX_TASK_TAG, ESP_LOG_INFO);
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while (1) {
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sendData(TX_TASK_TAG, "Hello world");
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vTaskDelay(2000 / portTICK_PERIOD_MS);
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}
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}
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static void rx_task()
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{
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static const char *RX_TASK_TAG = "RX_TASK";
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esp_log_level_set(RX_TASK_TAG, ESP_LOG_INFO);
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uint8_t* data = (uint8_t*) malloc(RX_BUF_SIZE+1);
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while (1) {
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const int rxBytes = uart_read_bytes(UART_NUM_1, data, RX_BUF_SIZE, 1000 / portTICK_RATE_MS);
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if (rxBytes > 0) {
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data[rxBytes] = 0;
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ESP_LOGI(RX_TASK_TAG, "Read %d bytes: '%s'", rxBytes, data);
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ESP_LOG_BUFFER_HEXDUMP(RX_TASK_TAG, data, rxBytes, ESP_LOG_INFO);
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}
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}
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free(data);
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}
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void app_main()
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{
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init();
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xTaskCreate(rx_task, "uart_rx_task", 1024*2, NULL, configMAX_PRIORITIES, NULL);
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xTaskCreate(tx_task, "uart_tx_task", 1024*2, NULL, configMAX_PRIORITIES-1, NULL);
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}
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