stm32与esp01s连接代码

以下是使用STM32与ESP01S连接的示例代码：

#include <stdio.h>
#include "stm32f10x.h"

#define SSID "your_wifi_ssid"
#define PASSWORD "your_wifi_password"

USART_InitTypeDef USART_InitStructure;

void USART1_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* Enable GPIOA clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    /* Enable USART1 clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

    /* Configure USART1 Tx (PA9) as alternate function push-pull */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* Configure USART1 Rx (PA10) as input floating */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    /* USART1 configuration */
    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_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStructure);

    /* Enable USART1 */
    USART_Cmd(USART1, ENABLE);
}

void USART1_SendString(const char* str)
{
    while (*str != '\0')
    {
        while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
        USART_SendData(USART1, *str++);
    }
}

void USART1_SendByte(uint8_t ch)
{
    while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    USART_SendData(USART1, ch);
}

void USART1_SendCommand(const char* cmd)
{
    USART1_SendString("AT+");
    USART1_SendString(cmd);
    USART1_SendString("\r\n");
}

void USART1_WaitResponse(const char* expectedResponse)
{
    char buffer[100] = {0};
    int i = 0;
    do
    {
        while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
        buffer[i] = USART_ReceiveData(USART1);
        i++;
    } while (i < 100 && buffer[i-1] != '\n');

    if (strstr(buffer, expectedResponse) == NULL)
    {
        printf("Error: expected response \"%s\" not received.\n", expectedResponse);
    }
}

int main(void)
{
    USART1_Init();

    USART1_SendCommand("RST");
    USART1_WaitResponse("ready");

    USART1_SendCommand("CWMODE=1");
    USART1_WaitResponse("OK");

    USART1_SendCommand("CWJAP=\"" SSID "\",\"" PASSWORD "\"");
    USART1_WaitResponse("OK");

    USART1_SendCommand("CIFSR");
    USART1_WaitResponse("OK");

    while (1)
    {
        USART1_SendCommand("CIPSTART=\"TCP\",\"example.com\",80");
        USART1_WaitResponse("OK");

        USART1_SendCommand("CIPSEND=4");
        USART1_WaitResponse(">");

        USART1_SendString("GET ");
        USART1_SendByte(13);
        USART1_SendByte(10);
        USART1_SendByte(13);
        USART1_SendByte(10);

        USART1_WaitResponse("SEND OK");

        USART1_WaitResponse("+IPD");

        char buffer[100] = {0};
        int i = 0;
        do
        {
            while (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == RESET);
            buffer[i] = USART_ReceiveData(USART1);
            i++;
        } while (i < 100 && buffer[i-1] != '\n');

        printf("Received data: %s\n", buffer);

        USART1_SendCommand("CIPCLOSE");
        USART1_WaitResponse("OK");

        delay_ms(5000); // wait 5 seconds before trying again
    }
}

这个示例代码使用了USART1串口连接到ESP01S。它连接到Wi-Fi网络，然后定期发送HTTP GET请求并显示响应。请注意，此代码仅用于演示目的，实际应用程序需要更多的错误处理和容错机制。