and i want to communicate with uart and serial port
i took the following code example:
Code: Select all
/* UART Echo Example
This example code is in the Public Domain (or CC0 licensed, at your option.)
Unless required by applicable law or agreed to in writing, this
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/uart.h"
#include "esp_log.h"
/**
* This is an example which echos any data it receives on UART1 back to the sender,
* with hardware flow control turned off. It does not use UART driver event queue.
*
* - Port: UART1
* - Receive (Rx) buffer: on
* - Transmit (Tx) buffer: off
* - Flow control: off
* - Event queue: off
* - Pin assignment: see defines below
*/
#define ECHO_TEST_TXD (GPIO_NUM_4)
#define ECHO_TEST_RXD (GPIO_NUM_5)
#define ECHO_TEST_RTS (UART_PIN_NO_CHANGE)
#define ECHO_TEST_CTS (UART_PIN_NO_CHANGE)
#define BUF_SIZE (1024)
static const char *TAG = "UART ECHO";
static void echo_task()
{
/* Configure parameters of an UART driver,
* communication pins and install the driver */
uart_config_t uart_config = {
.baud_rate = 9600,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE
};
uart_param_config(UART_NUM_0, &uart_config);
uart_set_pin(UART_NUM_0, 21, 22, ECHO_TEST_RTS, ECHO_TEST_CTS);
uart_driver_install(UART_NUM_0, BUF_SIZE * 2, 0, 0, NULL, 0);
// Configure a temporary buffer for the incoming data
uint8_t *data = (uint8_t *) malloc(BUF_SIZE);
while (1) {
// Read data from the UART
int len = uart_read_bytes(UART_NUM_0, data, BUF_SIZE, 20 / portTICK_RATE_MS);
if(len > 0)
ESP_LOGI(TAG, "[DATA EVT]: %s, %d",(const char *) data, len);
uart_write_bytes(UART_NUM_0, (const char *) data, len);
}
}
void app_main()
{
xTaskCreate(echo_task, "uart_echo_task", 1024, NULL, 10, NULL);
}
i've attached a picture of the wiring
the chip connected to esp32 is increase the volt to fit the pc (sp3232ecp 0633L)
is there a guide or an example how to make it works?
thank you