63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/* UART Echo Example
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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 <stdio.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/uart.h"
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/**
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* This is an example which echos any data it receives on UART1 back to the sender,
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* with hardware flow control turned off. It does not use UART driver event queue.
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*
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* - Port: UART1
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* - Receive (Rx) buffer: on
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* - Transmit (Tx) buffer: off
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* - Flow control: off
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* - Event queue: off
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* - Pin assignment: see defines below
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*/
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#define ECHO_TEST_TXD (GPIO_NUM_4)
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#define ECHO_TEST_RXD (GPIO_NUM_5)
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#define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
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#define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)
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#define BUF_SIZE (1024)
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static void echo_task()
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{
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/* Configure parameters of an UART driver,
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* communication pins and install the driver */
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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, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS);
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uart_driver_install(UART_NUM_1, BUF_SIZE * 2, 0, 0, NULL, 0);
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// Configure a temporary buffer for the incoming data
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uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
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while (1) {
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// Read data from the UART
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int len = uart_read_bytes(UART_NUM_1, data, BUF_SIZE, 20 / portTICK_RATE_MS);
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// Write data back to the UART
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uart_write_bytes(UART_NUM_1, (const char *) data, len);
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}
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}
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void app_main()
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{
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xTaskCreate(echo_task, "uart_echo_task", 1024, NULL, 10, NULL);
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}
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