#define CM_RESP_TIME_OUT (3)

`#define CM_RESP_TIME_OUT (3)` 是一个宏定义，它定义了一个名为 `CM_RESP_TIME_OUT` 的常量，并将其值设为 3。在程序中使用 `CM_RESP_TIME_OUT` 可以代替直接使用数字 3，使得程序更加易于维护和修改。这个宏定义的含义是某个操作的超时时间为 3 秒。

如果在程序中需要多次使用相同的超时时间，可以使用宏定义来避免多次输入相同的数字。另外，如果需要修改超时时间，只需要修改宏定义的值即可，而不需要在程序中搜索每一个使用到超时时间的地方进行修改。

相关问题

使用stm32f407vet6的SPI1接口接ADS131A04芯片，使用PA3作为DRDY引脚，写出ADS131A04的驱动程序

好的，以下是基于HAL库的ADS131A04驱动程序示例：

#include "stm32f4xx_hal.h"

#define ADS131A04_SPI_TIMEOUT   1000

/* ADS131A04命令字 */
#define CMD_WAKEUP      0x02
#define CMD_STANDBY     0x04
#define CMD_RESET       0x06
#define CMD_START       0x08
#define CMD_STOP        0x0A
#define CMD_RDATA       0x12
#define CMD_RDATAC      0x14
#define CMD_SDATAC      0x16
#define CMD_RREG        0x20
#define CMD_WREG        0x40

/* ADS131A04寄存器地址 */
#define REG_ID          0x00
#define REG_CONFIG1     0x01
#define REG_CONFIG2     0x02
#define REG_CONFIG3     0x03
#define REG_CH1SET      0x04
#define REG_CH2SET      0x05
#define REG_CH3SET      0x06
#define REG_CH4SET      0x07
#define REG_CH5SET      0x08
#define REG_CH6SET      0x09
#define REG_CH7SET      0x0A
#define REG_CH8SET      0x0B
#define REG_RLD_SENSP   0x0C
#define REG_RLD_SENSN   0x0D
#define REG_LOFF        0x0E
#define REG_RESP1       0x10
#define REG_RESP2       0x11

/* ADS131A04寄存器值 */
#define CONFIG1_VAL     0x30    // 采样率2KSPS，无功率线干扰滤波器
#define CONFIG2_VAL     0x00    // 正常功率线频率
#define CONFIG3_VAL     0x00    // 内部参考电压
#define CHNSET_VAL      0x00    // 缺省通道设置，单端，增益1

/* ADS131A04引脚定义 */
#define DRDY_PIN        GPIO_PIN_3
#define DRDY_PORT       GPIOA

/* ADS131A04寄存器读写函数 */
static uint8_t ADS131A04_ReadReg(SPI_HandleTypeDef *hspi, uint8_t reg)
{
    uint8_t txbuf[2] = {CMD_RREG | reg, 0x00};
    uint8_t rxbuf[2] = {0x00, 0x00};

    HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_SET);   // 关闭DRDY中断

    HAL_SPI_TransmitReceive(hspi, txbuf, rxbuf, 2, ADS131A04_SPI_TIMEOUT);

    HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_RESET); // 重新打开DRDY中断

    return rxbuf[1];
}

static void ADS131A04_WriteReg(SPI_HandleTypeDef *hspi, uint8_t reg, uint8_t val)
{
    uint8_t txbuf[2] = {CMD_WREG | reg, val};

    HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_SET);   // 关闭DRDY中断

    HAL_SPI_Transmit(hspi, txbuf, 2, ADS131A04_SPI_TIMEOUT);

    HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_RESET); // 重新打开DRDY中断
}

/* ADS131A04控制函数 */
void ADS131A04_Init(SPI_HandleTypeDef *hspi)
{
    // 等待ADS131A04上电稳定
    HAL_Delay(10);

    // 复位ADS131A04
    ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_RESET);
    HAL_Delay(100); // 复位后需要一定时间恢复

    // 设置ADS131A04采样率和滤波器
    ADS131A04_WriteReg(hspi, REG_CONFIG1, CONFIG1_VAL);
    ADS131A04_WriteReg(hspi, REG_CONFIG2, CONFIG2_VAL);
    ADS131A04_WriteReg(hspi, REG_CONFIG3, CONFIG3_VAL);

    // 配置通道设置
    ADS131A04_WriteReg(hspi, REG_CH1SET, CHNSET_VAL);
    ADS131A04_WriteReg(hspi, REG_CH2SET, CHNSET_VAL);
    ADS131A04_WriteReg(hspi, REG_CH3SET, CHNSET_VAL);
    ADS131A04_WriteReg(hspi, REG_CH4SET, CHNSET_VAL);

    // 退出SDATAC模式
    ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_RDATAC);
}

void ADS131A04_Start(SPI_HandleTypeDef *hspi)
{
    ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_START);
}

void ADS131A04_Stop(SPI_HandleTypeDef *hspi)
{
    ADS131A04_WriteReg(hspi, REG_CONFIG1, CMD_STOP);
}

void ADS131A04_ReadData(SPI_HandleTypeDef *hspi, uint8_t *rxbuf, uint32_t len)
{
    uint8_t txbuf[1] = {CMD_RDATA};

    // 关闭DRDY中断
    HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_SET);

    // 发送读取数据命令
    HAL_SPI_Transmit(hspi, txbuf, 1, ADS131A04_SPI_TIMEOUT);

    // 读取数据
    HAL_SPI_Receive(hspi, rxbuf, len, ADS131A04_SPI_TIMEOUT);

    // 重新打开DRDY中断
    HAL_GPIO_WritePin(DRDY_PORT, DRDY_PIN, GPIO_PIN_RESET);
}

uint8_t ADS131A04_ReadStatus(SPI_HandleTypeDef *hspi)
{
    return ADS131A04_ReadReg(hspi, REG_CONFIG1);
}

需要注意的是，该代码中使用PA3作为DRDY引脚，需要在初始化时将其配置为输入模式，并开启外部中断。在中断服务函数中，应当更新数据缓冲区并处理数据。

NB-IOT硬件驱动开发代码

NB-IoT硬件驱动开发代码的实现过程与具体的硬件平台和NB-IoT模组有关，下面是一份基于 STM32 平台和SIMCom SIM7020E模组的NB-IoT硬件驱动开发代码，供参考：

1. 硬件接口定义：

/* 串口接口定义 */
#define NB_UART              USART1
#define NB_UART_CLK          RCC_APB2Periph_USART1
#define NB_UART_CLK_CMD      RCC_APB2PeriphClockCmd
#define NB_UART_IRQn         USART1_IRQn
#define NB_UART_IRQHandler   USART1_IRQHandler
#define NB_UART_TX_PIN       GPIO_Pin_9
#define NB_UART_RX_PIN       GPIO_Pin_10
#define NB_UART_GPIO         GPIOA
#define NB_UART_GPIO_CLK     RCC_APB2Periph_GPIOA

/* GPIO接口定义 */
#define NB_PWRKEY_PIN        GPIO_Pin_1
#define NB_PWRKEY_GPIO       GPIOB
#define NB_PWRKEY_GPIO_CLK   RCC_APB2Periph_GPIOB
#define NB_PWRKEY_HIGH()     GPIO_SetBits(NB_PWRKEY_GPIO, NB_PWRKEY_PIN)
#define NB_PWRKEY_LOW()      GPIO_ResetBits(NB_PWRKEY_GPIO, NB_PWRKEY_PIN)

#define NB_STATUS_PIN        GPIO_Pin_0
#define NB_STATUS_GPIO       GPIOB
#define NB_STATUS_GPIO_CLK   RCC_APB2Periph_GPIOB
#define NB_STATUS_READ()     GPIO_ReadInputDataBit(NB_STATUS_GPIO, NB_STATUS_PIN)

2. 驱动程序编写：

（1）初始化NB-IOT模组

void nb_init(void)
{
    /* 使能UART和GPIO时钟 */
    RCC_APB2PeriphClockCmd(NB_UART_CLK | NB_UART_GPIO_CLK | NB_PWRKEY_GPIO_CLK | NB_STATUS_GPIO_CLK, ENABLE);

    /* 配置UART引脚 */
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = NB_UART_TX_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(NB_UART_GPIO, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = NB_UART_RX_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
    GPIO_Init(NB_UART_GPIO, &GPIO_InitStructure);

    /* 配置GPIO引脚 */
    GPIO_InitStructure.GPIO_Pin = NB_PWRKEY_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(NB_PWRKEY_GPIO, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = NB_STATUS_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(NB_STATUS_GPIO, &GPIO_InitStructure);

    /* 复位NB-IOT模组 */
    NB_PWRKEY_LOW();
    delay_ms(100);
    NB_PWRKEY_HIGH();
    delay_ms(5000);
}

（2）发送AT指令

uint8_t nb_send_at_cmd(char *cmd, char *resp, uint16_t timeout)
{
    uint8_t i = 0, j = 0;
    uint8_t ret = 0;
    char rx_buf[256] = {0};
    uint32_t t1 = 0, t2 = 0;

    /* 发送AT指令 */
    USART_ITConfig(NB_UART, USART_IT_RXNE, DISABLE);
    USART_ITConfig(NB_UART, USART_IT_TC, ENABLE);

    while (cmd[i] != '\0')
    {
        USART_SendData(NB_UART, (uint16_t)cmd[i++]);
        while (USART_GetFlagStatus(NB_UART, USART_FLAG_TC) == RESET);
    }

    /* 等待模组应答 */
    USART_ITConfig(NB_UART, USART_IT_TC, DISABLE);
    USART_ITConfig(NB_UART, USART_IT_RXNE, ENABLE);

    t1 = millis();
    while ((millis() - t1) < timeout)
    {
        if (USART_GetFlagStatus(NB_UART, USART_FLAG_RXNE) == SET)
        {
            rx_buf[j++] = (char)USART_ReceiveData(NB_UART);
        }

        if (strstr(rx_buf, resp) != NULL)
        {
            ret = 1;
            break;
        }
    }

    return ret;
}

（3）数据收发

void nb_send_data(uint8_t *data, uint16_t len)
{
    /* 发送数据 */
    char cmd[64] = {0};
    sprintf(cmd, "AT+NMGS=%d,%02X", len, data[0]);
    nb_send_at_cmd(cmd, "OK", 2000);

    memset(cmd, 0, sizeof(cmd));
    for (uint16_t i = 0; i < len; i++)
    {
        sprintf(cmd + strlen(cmd), "%02X", data[i]);
    }

    nb_send_at_cmd(cmd, "OK", 2000);
}

uint16_t nb_recv_data(uint8_t *data)
{
    /* 接收数据 */
    char cmd[64] = {0};
    nb_send_at_cmd("AT+NMGR=1", "+NMGR:", 2000);

    char *ptr = strstr((char *)nb_rx_buf, ",");
    ptr++;

    uint16_t len = 0;
    sscanf(ptr, "%02X", &len);

    ptr += 2;
    for (uint16_t i = 0; i < len; i++)
    {
        sscanf(ptr + i * 2, "%02X", (unsigned int *)(data + i));
    }

    return len;
}

3. 应用程序开发

（1）连接网络

uint8_t nb_connect_network(void)
{
    nb_send_at_cmd("AT+CFUN=0", "OK", 2000);
    nb_send_at_cmd("AT+CFUN=1", "OK", 2000);
    nb_send_at_cmd("AT+COPS=1,2,\"46001\"", "OK", 2000);
    nb_send_at_cmd("AT+CGDCONT=1,\"IP\",\"ctnet\"", "OK", 2000);
    nb_send_at_cmd("AT+CFUN=0", "OK", 2000);
    nb_send_at_cmd("AT+CFUN=1", "OK", 2000);
    nb_send_at_cmd("AT+CSQ", "OK", 2000);

    uint8_t i = 0;
    while (i < 10)
    {
        if (NB_STATUS_READ() == 0)
        {
            return 1;
        }

        delay_ms(1000);
        i++;
    }

    return 0;
}

（2）发送数据

uint8_t nb_send(uint8_t *data, uint16_t len)
{
    uint8_t retry = 3;

    while (retry > 0)
    {
        nb_send_data(data, len);

        if (nb_send_at_cmd("AT+NMGS?", "+NMGS:", 2000) == 1)
        {
            return 1;
        }

        retry--;
    }

    return 0;
}

（3）接收数据

uint16_t nb_recv(uint8_t *data)
{
    uint16_t len = 0;

    if (nb_send_at_cmd("AT+NMGR?", "+NMGR:", 2000) == 1)
    {
        len = nb_recv_data(data);
    }

    return len;
}

以上代码仅供参考，实际使用时需要根据具体的硬件平台和NB-IoT模组进行相应的修改和调试。