74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* Uart Events 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 <string.h>
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#include <stdlib.h>
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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 "nvs_flash.h"
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#include "driver/uart.h"
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#include "freertos/queue.h"
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#include "esp_log.h"
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#include "soc/uart_struct.h"
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/**
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* This is a example exaple which echos any data it receives on UART1 back to the sender, with hardware flow control
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* turned on. It does not use UART driver event queue.
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*
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* - port: UART1
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* - rx buffer: on
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* - tx buffer: off
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* - flow control: on
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* - event queue: off
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* - pin assignment: txd(io4), rxd(io5), rts(18), cts(19)
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*/
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#define ECHO_TEST_TXD (4)
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#define ECHO_TEST_RXD (5)
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#define ECHO_TEST_RTS (18)
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#define ECHO_TEST_CTS (19)
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#define BUF_SIZE (1024)
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//an example of echo test with hardware flow control on UART1
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static void echo_task()
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{
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const int uart_num = UART_NUM_1;
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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_CTS_RTS,
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.rx_flow_ctrl_thresh = 122,
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};
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//Configure UART1 parameters
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uart_param_config(uart_num, &uart_config);
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//Set UART1 pins(TX: IO4, RX: I05, RTS: IO18, CTS: IO19)
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uart_set_pin(uart_num, ECHO_TEST_TXD, ECHO_TEST_RXD, ECHO_TEST_RTS, ECHO_TEST_CTS);
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//Install UART driver (we don't need an event queue here)
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//In this example we don't even use a buffer for sending data.
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uart_driver_install(uart_num, BUF_SIZE * 2, 0, 0, NULL, 0);
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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 UART
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int len = uart_read_bytes(uart_num, data, BUF_SIZE, 20 / portTICK_RATE_MS);
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//Write data back to UART
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uart_write_bytes(uart_num, (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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//A uart read/write example without event queue;
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xTaskCreate(echo_task, "uart_echo_task", 1024, NULL, 10, NULL);
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}
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