刚写好实测可用的MS5611 SPI协议的驱动

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楼主 | 2018-7-19 11:34 | 只看该作者回帖奖励

|倒序浏览 |阅读模式

ms5611, spi协议, TE, se, IO

[mw_shl_code=c,true]u16 Cal_C[7];  //用于存放PROM中的8组数据
u32 D1,D2,OFF,SENS,dT,TEMP,Pressure;
float TEMP2;
static void delay_5us(void)
{
  u16 x;
  for(x = 0; x < 84; x++)
  {
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
  }
}

void MS5611_conversion(void)
{
  MS5611_CS = 0;
  delay_5us();
  spiSwap(MS5611_CD1_256);
  delay_ms(2);
  MS5611_CS = 1;
}

//从PROM读取出厂校准数据
u16 MS5611_PROM_READ(void)
{
  u8 i;
  u32 C1[7] = {0xA0,0xA2,0xA4,0xA6,0xA8,0xAA,0xAC};
  MS5611_CS = 0;
  delay_5us();
  for(i=0;i<=6;i++)
  {
      spiSwap(C1);
      delay_ms(1);
   Cal_C = spiSwap(C1);
   Cal_C <<= 8;
   Cal_C |= spiSwap(C1);
   delay_ms(1);
   MS5611_conversion();
   MS5611_CS = 0;
}
  MS5611_CS = 1;
  return Cal_C[6];
}

//读取数字温度
u32 MS5611_GetTemperature(void)
{
      MS5611_conversion();
      MS5611_CS = 0;
      delay_5us();
      spiSwap(MS5611_ADC);
      delay_ms(5);
      D2 = spiSwap(0x50);
      D2 <<= 8;
      D2 |= spiSwap(0x50);
      D2 <<=8;
      D2 |= spiSwap(0x50);
      dT = D2-(((u32)Cal_C[5])<<8);
      TEMP = 2000+dT*((u32)Cal_C[6])/8388608;
      MS5611_CS = 1;
      return(D2);
}

//读取数字气压
u32 MS5611_GetPressure(void)
{
      double Aux,OFF2,SENS2;
      MS5611_conversion();
      MS5611_CS = 0;
      delay_5us();
      spiSwap(MS5611_ADC);
      delay_ms(5);
      D1 = spiSwap(0x40);
      D1 <<= 8;
      D1 |= spiSwap(0x40);
      D1 <<= 8;
      D1 |= spiSwap(0x40);
      delay_ms(10);
      OFF = (u32)(Cal_C[2]<<16)+((u32)Cal_C[4]*dT)/128.0;
      SENS =(u32)(Cal_C[1]<<15)+((u32)Cal_C[3]*dT)/256.0;
      if(TEMP <2000)             //低于20摄氏度时的二阶温度补偿
      {
            TEMP2 = (dT*dT)/0x80000000;
            Aux = (TEMP-2000)*(TEMP-2000);
            OFF2 = 2.5*Aux;
            SENS2 = 1.25*Aux;
            if(TEMP2 <-1500)
            {
                     Aux = (TEMP2+1500)*(TEMP2+1500);
                     OFF2 = OFF2 + 7*Aux;
                     SENS2 = SENS + 5.5*Aux;
            }
      }else       //(TEMP >2000)
      {
            TEMP2 = 0;
            OFF2 = 0;
            SENS2 = 0;
      }
      TEMP = TEMP - TEMP2;
      OFF = OFF - OFF2;
      SENS = SENS - SENS2;
      MS5611_CS = 1;
      Pressure=(D1*SENS/2097152.0-OFF)/32768.0;
      return(D1);
}
[/mw_shl_code]

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刚写好实测可用的MS5611 SPI协议的驱动

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