esp8266-01s与stm32通信代码hal库
时间: 2023-09-13 07:07:45 浏览: 57
下面是使用HAL库实现ESP8266-01S与STM32通信的代码示例:
1. 初始化串口
首先,需要使用HAL库初始化STM32的串口,以便与ESP8266-01S进行通信。假设使用的是USART1,波特率为115200,代码如下:
```c
/* 定义串口句柄 */
UART_HandleTypeDef huart1;
/* 串口初始化函数 */
void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}
```
2. 发送AT指令
在与ESP8266-01S通信的过程中,需要发送AT指令给ESP8266-01S,以便设置与连接WiFi等操作。发送AT指令的函数如下:
```c
void sendAT(char* at_cmd)
{
HAL_UART_Transmit(&huart1, (uint8_t*)at_cmd, strlen(at_cmd), 1000);
HAL_Delay(500);
}
```
3. 接收ESP8266-01S的回复
发送AT指令后,需要等待ESP8266-01S的回复。接收ESP8266-01S的回复的函数如下:
```c
void recvResponse(char* response)
{
uint8_t recvByte;
uint8_t index = 0;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
while(recvByte != '\n')
{
response[index] = recvByte;
index++;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
}
response[index] = '\0';
}
```
4. 发送数据给ESP8266-01S
如果需要向ESP8266-01S发送数据,可以使用如下的函数:
```c
void sendDataToESP(char* data)
{
HAL_UART_Transmit(&huart1, (uint8_t*)data, strlen(data), 1000);
}
```
5. 接收ESP8266-01S发送的数据
如果ESP8266-01S向STM32发送了数据,可以使用如下的函数接收数据:
```c
void recvDataFromESP(char* data)
{
uint8_t recvByte;
uint8_t index = 0;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
while(recvByte != '\n')
{
data[index] = recvByte;
index++;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
}
data[index] = '\0';
}
```
6. 示例代码
下面是一个完整的示例代码,可以参考实现ESP8266-01S和STM32的通信:
```c
#include "stm32f1xx_hal.h"
#include <string.h>
UART_HandleTypeDef huart1;
void MX_USART1_UART_Init(void);
void sendAT(char* at_cmd);
void recvResponse(char* response);
void sendDataToESP(char* data);
void recvDataFromESP(char* data);
int main(void)
{
HAL_Init();
MX_USART1_UART_Init();
char response[100];
char data[100];
/* 发送AT指令 */
sendAT("AT\r\n");
recvResponse(response);
/* 解析ESP8266-01S的回复 */
if(strstr(response, "OK"))
{
/* 设置模式为STA,连接指定WiFi */
sendAT("AT+CWMODE=1\r\n");
recvResponse(response);
if(strstr(response, "OK"))
{
sendAT("AT+CWJAP=\"SSID\",\"PASSWORD\"\r\n");
recvResponse(response);
if(strstr(response, "OK"))
{
/* 连接成功,向ESP8266-01S发送数据 */
sendDataToESP("Hello ESP8266-01S!\r\n");
/* 接收ESP8266-01S发送的数据 */
recvDataFromESP(data);
}
}
}
while (1)
{
}
}
void MX_USART1_UART_Init(void)
{
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart1.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart1) != HAL_OK)
{
Error_Handler();
}
}
void sendAT(char* at_cmd)
{
HAL_UART_Transmit(&huart1, (uint8_t*)at_cmd, strlen(at_cmd), 1000);
HAL_Delay(500);
}
void recvResponse(char* response)
{
uint8_t recvByte;
uint8_t index = 0;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
while(recvByte != '\n')
{
response[index] = recvByte;
index++;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
}
response[index] = '\0';
}
void sendDataToESP(char* data)
{
HAL_UART_Transmit(&huart1, (uint8_t*)data, strlen(data), 1000);
}
void recvDataFromESP(char* data)
{
uint8_t recvByte;
uint8_t index = 0;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
while(recvByte != '\n')
{
data[index] = recvByte;
index++;
HAL_UART_Receive(&huart1, &recvByte, 1, 2000);
}
data[index] = '\0';
}
```