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。