用HAL库写驱动3个ads1115

好的，下面是基于STM32 HAL库的3个ADS1115驱动的代码示例：

首先，需要定义一些常量和变量：

// 定义ADS1115器件地址
#define ADS1115_ADDR_1  0x90
#define ADS1115_ADDR_2  0x92
#define ADS1115_ADDR_3  0x94

// 定义ADS1115内部寄存器地址
#define ADS1115_REG_CONVERSION  0x00
#define ADS1115_REG_CONFIG      0x01

// ADS1115配置寄存器的bit位定义
#define ADS1115_CFG_OS          15
#define ADS1115_CFG_MUX         12
#define ADS1115_CFG_PGA         9
#define ADS1115_CFG_MODE        8
#define ADS1115_CFG_DR          5
#define ADS1115_CFG_COMP_MODE   4
#define ADS1115_CFG_COMP_POL    3
#define ADS1115_CFG_COMP_LAT    2
#define ADS1115_CFG_COMP_QUE    0

// 定义ADS1115采样率和增益设置
#define ADS1115_SPS_8           0x0000
#define ADS1115_SPS_16          0x0020
#define ADS1115_SPS_32          0x0040
#define ADS1115_SPS_64          0x0060
#define ADS1115_SPS_128         0x0080
#define ADS1115_SPS_250         0x00A0
#define ADS1115_SPS_475         0x00C0
#define ADS1115_SPS_860         0x00E0
#define ADS1115_PGA_6           0x0000
#define ADS1115_PGA_4           0x0200
#define ADS1115_PGA_2           0x0400
#define ADS1115_PGA_1           0x0600

接下来，编写ADS1115的初始化函数。在这个函数中，需要配置ADS1115的采样率、增益、输入通道和比较器等参数，然后将配置写入ADS1115的配置寄存器中：

void ADS1115_Init(I2C_HandleTypeDef* hi2c, uint8_t addr)
{
    uint16_t config = ADS1115_SPS_128 | ADS1115_PGA_1 | 0x0004;  // 配置采样率为128SPS，增益为1，单端输入A0，比较器禁用

    // 向ADS1115写入配置
    uint8_t txBuf[3];
    txBuf[0] = ADS1115_REG_CONFIG;
    txBuf[1] = config >> 8;
    txBuf[2] = config & 0xFF;
    HAL_I2C_Master_Transmit(hi2c, addr, txBuf, 3, HAL_MAX_DELAY);
}

接下来，编写读取ADS1115数据的函数。在这个函数中，需要向ADS1115写入读取命令，然后读取2个字节的数据，将其转换为有符号整型数值并返回：

int16_t ADS1115_Read(I2C_HandleTypeDef* hi2c, uint8_t addr)
{
    // 向ADS1115发送读取命令
    uint8_t txBuf[1] = {ADS1115_REG_CONVERSION};
    HAL_I2C_Master_Transmit(hi2c, addr, txBuf, 1, HAL_MAX_DELAY);

    // 读取采样数据
    uint8_t rxBuf[2];
    HAL_I2C_Master_Receive(hi2c, addr, rxBuf, 2, HAL_MAX_DELAY);

    // 将读取到的数据转换为整型数值
    int16_t result = (int16_t)(rxBuf[0] << 8 | rxBuf[1]);

    return result;
}

最后，需要在主函数中调用初始化函数和读取函数，以获取3个ADS1115的采样数据：

int main()
{
    // 初始化I2C总线
    HAL_I2C_Init(&hi2c);

    // 初始化3个ADS1115
    ADS1115_Init(&hi2c, ADS1115_ADDR_1);
    ADS1115_Init(&hi2c, ADS1115_ADDR_2);
    ADS1115_Init(&hi2c, ADS1115_ADDR_3);

    // 读取3个ADS1115采样数据
    int16_t sample1 = ADS1115_Read(&hi2c, ADS1115_ADDR_1);
    int16_t sample2 = ADS1115_Read(&hi2c, ADS1115_ADDR_2);
    int16_t sample3 = ADS1115_Read(&hi2c, ADS1115_ADDR_3);

    // 处理采样数据
    ...

    // 循环执行
    while (1)
    {
        // 读取3个ADS1115采样数据
        sample1 = ADS1115_Read(&hi2c, ADS1115_ADDR_1);
        sample2 = ADS1115_Read(&hi2c, ADS1115_ADDR_2);
        sample3 = ADS1115_Read(&hi2c, ADS1115_ADDR_3);

        // 处理采样数据
        ...
    }
}

这样，就可以通过HAL库实现3个ADS1115的驱动了。