stm32收发at指令程序编写

下面是一个使用STM32收发AT指令的简单示例程序，以使用USART1为例：

#include "stm32f1xx_hal.h"

#define RX_BUFFER_SIZE 1024
#define TX_BUFFER_SIZE 1024

UART_HandleTypeDef huart1;
uint8_t rx_buffer[RX_BUFFER_SIZE];
uint16_t rx_idx = 0;
uint8_t tx_buffer[TX_BUFFER_SIZE];
uint16_t tx_idx = 0;

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
    if (huart == &huart1) {
        if (rx_idx < RX_BUFFER_SIZE) {
            rx_buffer[rx_idx++] = huart->Instance->DR;
        }
        HAL_UART_Receive_IT(&huart1, &huart1->Instance->DR, 1);
    }
}

void HAL_UART_TxCpltCallback(UART_HandleTypeDef *huart)
{
    if (huart == &huart1) {
        if (tx_idx > 0) {
            uint16_t size = tx_idx > TX_BUFFER_SIZE ? TX_BUFFER_SIZE : tx_idx;
            HAL_UART_Transmit_IT(&huart1, tx_buffer, size);
            tx_idx -= size;
            for (int i = 0; i < tx_idx; i++) {
                tx_buffer[i] = tx_buffer[i + size];
            }
        }
    }
}

void HAL_UART_ErrorCallback(UART_HandleTypeDef *huart)
{
    if (huart == &huart1) {
        HAL_UART_Receive_IT(&huart1, &huart1->Instance->DR, 1);
    }
}

void send_at_command(const char *command)
{
    uint16_t len = strlen(command);
    if (len <= TX_BUFFER_SIZE - tx_idx) {
        memcpy(tx_buffer + tx_idx, command, len);
        tx_idx += len;
        HAL_UART_Transmit_IT(&huart1, tx_buffer, len);
    }
}

int main(void)
{
    HAL_Init();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_USART1_CLK_ENABLE();
    
    GPIO_InitTypeDef gpio_init = {
        .Pin = GPIO_PIN_9 | GPIO_PIN_10,
        .Mode = GPIO_MODE_AF_PP,
        .Pull = GPIO_PULLUP,
        .Speed = GPIO_SPEED_FREQ_HIGH,
        .Alternate = GPIO_AF7_USART1,
    };
    HAL_GPIO_Init(GPIOA, &gpio_init);
    
    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;
    HAL_UART_Init(&huart1);
    
    HAL_UART_Receive_IT(&huart1, &huart1->Instance->DR, 1);  //开启接收中断

    while (1) {
        // 发送 AT 指令
        send_at_command("AT\r\n");
        HAL_Delay(500);

        // 接收 AT 指令的回复
        if (rx_idx > 0) {
            rx_buffer[rx_idx] = '\0';
            printf("Recv: %s", rx_buffer);
            rx_idx = 0;
        }
    }
}

注意事项：

1. 在使用HAL库时，需要在stm32f1xx_hal_conf.h文件中开启UART中断接收和发送的宏定义：

#define HAL_UART_MODULE_ENABLED
#define HAL_UART_RX_IT_ENABLE
#define HAL_UART_TX_IT_ENABLE

2. 在发送和接收AT指令时，需要使用\r\n结尾。

3. 在接收数据时，需要在HAL_UART_RxCpltCallback回调函数中开启下一次接收。

4. 在发送数据时，需要在HAL_UART_TxCpltCallback回调函数中继续发送缓冲区中剩余的数据。

5. 在出现串口接收错误时，需要在HAL_UART_ErrorCallback回调函数中重新开启接收。