STM32发送AT控制NB模块的代码

以下是基于HAL库的STM32发送AT指令控制NB模块的示例代码：

#include "stdio.h"
#include "string.h"
#include "stm32f1xx_hal.h"

#define NB_UART huart1 // NB模块使用的UART
#define NB_BUFFER_SIZE 128 // NB模块通信缓冲区大小

UART_HandleTypeDef NB_UART;
uint8_t nb_buffer[NB_BUFFER_SIZE];

void nb_send_cmd(char* cmd) {
    HAL_UART_Transmit(&NB_UART, (uint8_t*)cmd, strlen(cmd), HAL_MAX_DELAY);
}

void nb_send_data(uint8_t* data, uint16_t len) {
    HAL_UART_Transmit(&NB_UART, data, len, HAL_MAX_DELAY);
}

void nb_receive_data(uint8_t* data, uint16_t len) {
    HAL_UART_Receive(&NB_UART, data, len, HAL_MAX_DELAY);
}

void nb_reset(void) {
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET);
    HAL_Delay(100);
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_SET);
}

int nb_init(void) {
    nb_reset();

    nb_send_cmd("AT\r\n");
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    nb_send_cmd("AT+CGATT=1\r\n"); // 激活PS网络
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    nb_send_cmd("AT+CGDCONT=1,\"IP\",\"cmnet\"\r\n"); // 设置APN
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    nb_send_cmd("AT+CNMP=38\r\n"); // 设置NB-IoT网络
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    nb_send_cmd("AT+CMNB=1\r\n"); // 设置NB模式
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    return 0;
}

int nb_connect(char* host, int port) {
    char cmd[32];
    sprintf(cmd, "AT+QNACT=1\r\n");
    nb_send_cmd(cmd); // 激活PDP上下文
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    sprintf(cmd, "AT+QIOPEN=1,0,\"TCP\",\"%s\",%d,0,1\r\n", host, port);
    nb_send_cmd(cmd); // 建立TCP连接
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "OK") == NULL) {
        return -1;
    }

    return 0;
}

void nb_disconnect(void) {
    nb_send_cmd("AT+QICLOSE=0\r\n"); // 关闭TCP连接
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    nb_send_cmd("AT+QNACT=0\r\n"); // 停止PDP上下文
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
}

int nb_send(char* data) {
    char cmd[32];
    int len = strlen(data);
    sprintf(cmd, "AT+QISEND=0,%d\r\n", len);
    nb_send_cmd(cmd); // 准备发送数据
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, ">") == NULL) {
        return -1;
    }

    nb_send_data((uint8_t*)data, len); // 发送数据
    nb_receive_data(nb_buffer, NB_BUFFER_SIZE); // 接收AT响应
    if (strstr((char*)nb_buffer, "SEND OK") == NULL) {
        return -1;
    }

    return 0;
}

int main(void) {
    HAL_Init();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_USART1_CLK_ENABLE();

    GPIO_InitTypeDef GPIO_InitStruct = {0};
    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    NB_UART.Instance = USART1;
    NB_UART.Init.BaudRate = 115200;
    NB_UART.Init.WordLength = UART_WORDLENGTH_8B;
    NB_UART.Init.StopBits = UART_STOPBITS_1;
    NB_UART.Init.Parity = UART_PARITY_NONE;
    NB_UART.Init.Mode = UART_MODE_TX_RX;
    NB_UART.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    NB_UART.Init.OverSampling = UART_OVERSAMPLING_16;
    HAL_UART_Init(&NB_UART);

    nb_init(); // 初始化NB模块

    nb_connect("www.example.com", 80); // 连接服务器
    nb_send("Hello, World!"); // 发送数据
    nb_disconnect(); // 断开连接

    while (1) {
        // 你的代码
    }
}

注意：以上代码仅供参考，实际使用时需要根据NB模块和STM32的具体型号进行相应的修改。