stm32与esp32通过UART串口传送字符串
时间: 2023-12-25 08:03:28 浏览: 63
首先,需要确保STM32和ESP32都有UART串口通信功能,并且它们的波特率、数据位、停止位、校验位等参数都一致。
接着,在STM32的程序中,需要使用UART的发送函数将字符串发送给ESP32。具体实现步骤如下:
1. 初始化UART串口,设置波特率、数据位、停止位、校验位等参数。
2. 编写发送函数,将字符串转换成字符数组,然后使用UART的发送函数逐个发送字符。
3. 在ESP32的程序中,同样需要初始化UART串口,并设置相同的波特率、数据位、停止位、校验位等参数。
4. 编写接收函数,不断读取UART串口接收缓存区中的数据,直到读取到结束符(例如'\0')为止。然后将接收到的字符串打印出来。
下面是一个简单的示例代码,实现了STM32向ESP32发送字符串,并在ESP32上打印接收到的字符串。
STM32程序:
```c
#include "stm32f10x.h"
#include <stdio.h>
#define UART_TX_PIN GPIO_Pin_9
#define UART_RX_PIN GPIO_Pin_10
void UART_Init(void) {
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = UART_TX_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = UART_RX_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void UART_SendString(char *str) {
while (*str) {
USART_SendData(USART1, *str++);
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
}
int main(void) {
UART_Init();
char *str = "Hello, ESP32!\n";
UART_SendString(str);
while (1);
}
```
ESP32程序:
```c
#include "driver/uart.h"
#include <stdio.h>
#define UART_NUM UART_NUM_2
#define UART_BAUDRATE 115200
void UART_Init(void) {
uart_config_t uart_config = {
.baud_rate = UART_BAUDRATE,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE
};
ESP_ERROR_CHECK(uart_param_config(UART_NUM, &uart_config));
ESP_ERROR_CHECK(uart_set_pin(UART_NUM, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE));
ESP_ERROR_CHECK(uart_driver_install(UART_NUM, 1024, 0, 0, NULL, 0));
}
void UART_ReceiveString(char *buf, int len) {
int i = 0;
while (i < len - 1) {
int n = uart_read_bytes(UART_NUM, (uint8_t*)buf + i, 1, pdMS_TO_TICKS(10));
if (n == 1) {
if (buf[i] == '\0') {
break;
}
i++;
}
}
buf[i] = '\0';
}
void app_main(void) {
UART_Init();
char buf[1024];
UART_ReceiveString(buf, sizeof(buf));
printf("%s", buf);
}
```