[APM32F0] APM32F072硬件IIC读取温湿度传感器

#define HTU_I2C                          I2C2

#define HTU_I2C_CLK                      RCM_APB1_PERIPH_I2C2



#define HTU_I2C_SCL_PIN                  GPIO_PIN_10

#define HTU_I2C_SCL_GPIO_PORT            GPIOB

#define HTU_I2C_SCL_GPIO_CLK             RCM_AHB_PERIPH_GPIOB

#define HTU_I2C_SCL_SOURCE               GPIO_PIN_SOURCE_10

#define HTU_I2C_SCL_AF                   GPIO_AF_PIN1



#define HTU_I2C_SDA_PIN                  GPIO_PIN_11

#define HTU_I2C_SDA_GPIO_PORT            GPIOB

#define HTU_I2C_SDA_GPIO_CLK             RCM_AHB_PERIPH_GPIOB

#define HTU_I2C_SDA_SOURCE               GPIO_PIN_SOURCE_11

#define HTU_I2C_SDA_AF                   GPIO_AF_PIN1



void APM_I2C_Init(void)

{

    GPIO_Config_T gpioConfigStruct;

    I2C_Config_T i2cConfigStruct;

    

    /* Enable I2C related Clock */

    RCM_EnableAHBPeriphClock(HTU_I2C_SCL_GPIO_CLK | HTU_I2C_SDA_GPIO_CLK);

    RCM_EnableAPB1PeriphClock(HTU_I2C_CLK);

    RCM_EnableAPB2PeriphClock(RCM_APB2_PERIPH_SYSCFG);



    /* Connect I2C to SCL */

    GPIO_ConfigPinAF(HTU_I2C_SCL_GPIO_PORT, HTU_I2C_SCL_SOURCE, HTU_I2C_SCL_AF);

    /* Connect I2C to SDA */

    GPIO_ConfigPinAF(HTU_I2C_SDA_GPIO_PORT, HTU_I2C_SDA_SOURCE, HTU_I2C_SDA_AF);

    /* Config I2C GPIO */

    gpioConfigStruct.mode = GPIO_MODE_AF;

    gpioConfigStruct.speed = GPIO_SPEED_50MHz;

    gpioConfigStruct.outtype = GPIO_OUT_TYPE_OD;

    gpioConfigStruct.pupd = GPIO_PUPD_NO;

    gpioConfigStruct.pin = HTU_I2C_SCL_PIN;

    GPIO_Config(HTU_I2C_SCL_GPIO_PORT, &gpioConfigStruct);



    gpioConfigStruct.pin = HTU_I2C_SDA_PIN;

    GPIO_Config(HTU_I2C_SDA_GPIO_PORT, &gpioConfigStruct);



    /*  Config I2C2 */

    I2C_Reset(HTU_I2C);



    i2cConfigStruct.ack = I2C_ACK_ENABLE;

    i2cConfigStruct.ackaddress = I2C_ACK_ADDRESS_7BIT;

    i2cConfigStruct.address1 = 0x00;

    i2cConfigStruct.analogfilter = I2C_ANALOG_FILTER_ENABLE;

    i2cConfigStruct.digitalfilter = I2C_DIGITAL_FILTER_0;

    i2cConfigStruct.mode = I2C_MODE_I2C;

    i2cConfigStruct.timing = 0xB0420F13;

    I2C_Config(HTU_I2C,&i2cConfigStruct);



    /* Enable I2Cx */

    I2C_Enable(HTU_I2C);

    

    I2CInfo.address = HTU_ADDR_WR;

    

                I2CInfo.addrNum = 1;

                

}

#define HTU_ADDR                0x80

#define HTU_ADDR_WR (HTU_ADDR & 0xFE)

#define HTU_ADDR_RD (HTU_ADDR | 0x01)



//非主机模式

#define HTU_TEMP    0xE3

#define HTU_HUMI    0XE5

I2C_ERROR_T I2C_HTU_Read(uint8_t* buffer, uint16_t writeAddr, uint8_t number)

{

    I2C_ERROR_T errSta = I2C_OK;

    uint32_t temp = number;

     uint8_t read_Num;





        

    I2C_HandlingTransfer(HTU_I2C, I2CInfo.address, I2CInfo.addrNum, I2C_RELOAD_MODE_SOFTEND, I2C_GENERATE_START_WRITE);

    

    I2CInfo.timeout = I2C_LONG_TIMEOUT;

    while(I2C_ReadStatusFlag(HTU_I2C, I2C_FLAG_TXINT) == RESET)

    {

        if((I2CInfo.timeout--) == 0)

        {

            errSta = I2C_TIMEOUT;

            return I2C_Callback(10);

        }

    }





    I2C_TxData(HTU_I2C, (uint8_t)(writeAddr & 0x00FF));

    

    I2CInfo.timeout = I2C_LONG_TIMEOUT;

    while(I2C_ReadStatusFlag(HTU_I2C, I2C_FLAG_TXCF) == RESET)

    {

        if((I2CInfo.timeout--) == 0)

        {

            errSta = I2C_TIMEOUT;

            return I2C_Callback(13);

        }

    }

        APM_EVAL_DelayMs(50);//等待转化完成

    /* I2Cx send the number of byte to write to eeprom */

    I2C_HandlingTransfer(HTU_I2C, I2CInfo.address, (uint8_t)(number), I2C_RELOAD_MODE_AUTOEND, I2C_GENERATE_START_READ);

    



    for(read_Num = 0; read_Num < temp; read_Num++)

  {

    I2CInfo.timeout = I2C_LONG_TIMEOUT;

    while(I2C_ReadStatusFlag(HTU_I2C, I2C_FLAG_RXBNE) == RESET)

    {

      if((I2CInfo.timeout--) == 0)

      {

        errSta = I2C_TIMEOUT;

                                 return I2C_Callback(14);

      }

    }



    buffer[read_Num] = I2C_RxData(HTU_I2C);

  }

    I2CInfo.timeout = I2C_LONG_TIMEOUT;

    while(I2C_ReadStatusFlag(HTU_I2C, I2C_FLAG_STOP) == RESET)

    {

        if((I2CInfo.timeout--) == 0)

        {

            errSta = I2C_TIMEOUT;

            return I2C_Callback(15);

        }

    } 

    

   I2C_ClearStatusFlag(HTU_I2C, I2C_FLAG_STOP);

    

    return errSta;

}

float Htu_Measure(uint8_t _ucOrder)

{

        uint8_t ucaRecvBuf[2] = {0};

        uint8_t ucTmpVal = _ucOrder;

        volatile float fTemp = 0.0;

        volatile float fHumi = 0.0;

        volatile float fRetVal = 0.0;





        I2C_HTU_Read(ucaRecvBuf,ucTmpVal,2);



        ucaRecvBuf[1] &= 0xFC;                //设置分辨率,最低两位为0,温度:14位;湿度:12位         

        fRetVal = (ucaRecvBuf[0] << 8) | ucaRecvBuf[1];        // MSB=(MSB<<=8)+LSB;即将MSB移位到高8位



        if(_ucOrder == HTU_TEMP)

        {

                 fTemp = (175.72) * fRetVal / 65536 - 46.85;//温度:T= -46.85 + 175.72 * ST/2^16

                 

                 return fTemp;

        }

        else if(_ucOrder == HTU_HUMI)

        {

                 fHumi = (fRetVal * 125) / 65536 - 6.00;//湿度: RH%= -6 + 125 * SRH/2^16



                 return fHumi;

        }

        else

        {

                return 0;

        }

}