stm32连接esp8266代码

以下是使用STM32与ESP8266进行连接的示例代码，使用了HAL库和AT指令集进行通信：

#include "main.h"
#include "stdio.h"
#include "string.h"

UART_HandleTypeDef huart2;

void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);

char uart_buf[1024];

void ESP8266_Init(void)
{
    HAL_Delay(500);
    // 发送AT指令，检查ESP8266是否正常工作
    sprintf(uart_buf, "AT\r\n");
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 1000);
    HAL_Delay(1000);

    // 设置ESP8266为STA模式
    sprintf(uart_buf, "AT+CWMODE=1\r\n");
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 1000);
    HAL_Delay(1000);

    // 连接WiFi
    sprintf(uart_buf, "AT+CWJAP=\"WiFi_SSID\",\"WiFi_Pass\"\r\n");
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 10000);
    HAL_Delay(10000);

    // 获取IP地址
    sprintf(uart_buf, "AT+CIFSR\r\n");
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 1000);
    HAL_Delay(1000);
}

void ESP8266_SendData(char* data)
{
    // 连接TCP服务器
    sprintf(uart_buf, "AT+CIPSTART=\"TCP\",\"Server_IP\",Server_Port\r\n");
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 1000);
    HAL_Delay(1000);

    // 发送数据
    sprintf(uart_buf, "AT+CIPSEND=%d\r\n", strlen(data));
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 1000);
    HAL_Delay(1000);
    HAL_UART_Transmit(&huart2, (uint8_t *)data, strlen(data), 1000);
    HAL_Delay(1000);

    // 关闭TCP连接
    sprintf(uart_buf, "AT+CIPCLOSE\r\n");
    HAL_UART_Transmit(&huart2, (uint8_t *)uart_buf, strlen(uart_buf), 1000);
    HAL_Delay(1000);
}

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    MX_USART2_UART_Init();

    ESP8266_Init();

    while (1)
    {
        ESP8266_SendData("Hello, World!");
        HAL_Delay(5000);
    }
}

void SystemClock_Config(void)
{
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

    /** Initializes the RCC Oscillators according to the specified parameters
    * in the RCC_OscInitTypeDef structure.
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
        Error_Handler();
    }
    /** Initializes the CPU, AHB and APB buses clocks
    */
    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                                |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_USART2_UART_Init(void)
{
    huart2.Instance = USART2;
    huart2.Init.BaudRate = 115200;
    huart2.Init.WordLength = UART_WORDLENGTH_8B;
    huart2.Init.StopBits = UART_STOPBITS_1;
    huart2.Init.Parity = UART_PARITY_NONE;
    huart2.Init.Mode = UART_MODE_TX_RX;
    huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart2.Init.OverSampling = UART_OVERSAMPLING_16;
    if (HAL_UART_Init(&huart2) != HAL_OK)
    {
        Error_Handler();
    }
}

static void MX_GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    /* GPIO Ports Clock Enable */
    __HAL_RCC_GPIOA_CLK_ENABLE();

    /*Configure GPIO pin : PA5 */
    GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}

void Error_Handler(void)
{
    while(1);
}

在代码中，您需要进行以下更改：

1. 将"WiFi_SSID"和"WiFi_Pass"更改为您的WiFi网络的名称和密码；
2. 将"Server_IP"和"Server_Port"更改为您要连接的TCP服务器的IP地址和端口号；
3. 将“Hello，World！”更改为您要发送的数据。

此代码中的UART2用于与ESP8266通信。您需要在HAL库中启用它，并将其连接到适当的引脚。