o: ActiveSupport::Cache::Entry :@compressedF: @value"}C"wC
main.c
18 18 
#define SPI_MODE_2  (SPI_H_TO_L)
19 19 
#define SPI_MODE_3  (SPI_H_TO_L | SPI_XMIT_L_TO_H)
20 20 

  		




  21
  
  
    
float a0;


  		




  
  21
  
    
float a0;      // correctiaon coefficients


  		




  22
  22
  
    
float b1;


  		




  23
  23
  
    
float b2;


  		




  24
  24
  
    
float c12;


  		




  ......




  38
  38
  
    
   spi_write(0x8A);              // get LSB for a0


  		




  39
  39
  
    
   a0_LSB = spi_read(0x00);


  		




  40
  40
  
    

  		




  41
  
  
    
   spi_write(0x8C);              // get MSB for a0


  		




  
  41
  
    
   spi_write(0x8C);              // get MSB for b1


  		




  42
  42
  
    
   b1_MSB = spi_read(0x00);


  		




  43
  
  
    
   spi_write(0x8E);              // get LSB for a0


  		




  
  43
  
    
   spi_write(0x8E);              // get LSB for b1


  		




  44
  44
  
    
   b1_LSB = spi_read(0x00);


  		




  45
  45
  
    

  		




  46
  
  
    
   spi_write(0x90);              // get MSB for a0


  		




  
  46
  
    
   spi_write(0x90);              // get MSB for b2


  		




  47
  47
  
    
   b2_MSB = spi_read(0x00);


  		




  48
  
  
    
   spi_write(0x92);              // get LSB for a0


  		




  
  48
  
    
   spi_write(0x92);              // get LSB for b2


  		




  49
  49
  
    
   b2_LSB = spi_read(0x00);


  		




  50
  50
  
    

  		




  51
  
  
    
   spi_write(0x94);              // get MSB for a0


  		




  
  51
  
    
   spi_write(0x94);              // get MSB for c12


  		




  52
  52
  
    
   c12_MSB = spi_read(0x00);


  		




  53
  
  
    
   spi_write(0x96);              // get LSB for a0


  		




  
  53
  
    
   spi_write(0x96);              // get LSB for c12


  		




  54
  54
  
    
   c12_LSB = spi_read(0x00);


  		




  55
  55
  
    

  		




  56
  56
  
    
   spi_read(0x00);


  		




  57
  57
  
    
   output_high(CSN_SPI);


  		




  
  58
  
    
 


  		




  
  59
  
    
 // translate to floating point number


  		




  58
  60
  
    
   


  		




  59
  61
  
    
   a0 = ((unsigned int16) a0_MSB << 5) + (a0_LSB >> 3) + (a0_LSB & 0x07)/8.0;


  		




  60
  62
  
    
   b1 = ((((b1_MSB & 0x1F) * 0x100) + b1_LSB) / 8192.0) - 3;


  		




  61
  63
  
    
   b2 = ((((unsigned int16) (b2_MSB - 0x80) << 8) + b2_LSB)/ 16384.0) - 2;


  		




  62
  64
  
    
   c12 =(((c12_MSB * 0x100) + c12_LSB)/16777216.0);


  		




  63
  
  
    

  		




  64
  
  
    
   printf("%4.3f %1.5f %1.5f %1.9f \r\n", a0, b1, b2, c12);


  		




  65
  
  
    

  		




  66
  65
  
    
}


  		




  67
  66
  
    

  		




  68
  67
  
    
float MPL_get_pressure()


  		




  ......




  96
  95
  
    
   output_high(CSN_SPI);


  		




  97
  96
  
    

  		




  98
  97
  
    
   ADC_temperature = (((unsigned int16) MSB_data << 8) + LSB_data ) >> 6;  // conversion of 8bit registers to 16bit variable 


  		




  99
  
  
    

  		




  100
  
  
    
   printf("%lu  %lu \r\n", ADC_pressure, ADC_temperature);


  		




  101
  98
  
    
   


  		




  102
  
  
    
   Pcomp = (a0 + (b1 + c12 * ADC_temperature) * ADC_pressure + b2 * ADC_temperature );


  		




  
  99
  
    
   Pcomp = (a0 + (b1 + c12 * ADC_temperature) * ADC_pressure + b2 * ADC_temperature );  // compute relative compensated pressure


  		




  103
  100
  
    

  		




  104
  
  
    
   printf("%f \r\n", Pcomp);


  		




  
  101
  
    
   return (Pcomp * ((115.0 - 50.0)/1023.0) + 50.0);  // return absolute pressure


  		




  
  102
  
    
}


  		




  105
  103
  
    

  		




  106
  
  
    
   return (Pcomp * ((115.0 - 50.0)/1023.0) + 50.0);


  		




  
  104
  
    
float MPL_get_temperature()


  		




  
  105
  
    
{   


  		




  
  106
  
    
unsigned int8 LSB_data, MSB_data;


  		




  
  107
  
    
unsigned int16 ADC_temperature;


  		




  
  108
  
    

  		




  
  109
  
    
   output_low(CSN_SPI);        //Start temperature and pressure conversion


  		




  
  110
  
    
   spi_write(0x22);


  		




  
  111
  
    
   spi_write(0x00);


  		




  
  112
  
    
   output_high(CSN_SPI);


  		




  
  113
  
    

  		




  
  114
  
    
   delay_ms(10);


  		




  
  115
  
    
         


  		




  
  116
  
    
   output_low(CSN_SPI);


  		




  
  117
  
    
   spi_write(0x84);


  		




  
  118
  
    
   MSB_data = spi_read(0x00);


  		




  
  119
  
    
   spi_write(0x86);              // get LSB for Temperature


  		




  
  120
  
    
   LSB_data = spi_read(0x00);


  		




  
  121
  
    
   spi_read(0x00);


  		




  
  122
  
    
   output_high(CSN_SPI);


  		




  
  123
  
    

  		




  
  124
  
    
   ADC_temperature = (((unsigned int16) MSB_data << 8) + LSB_data ) >> 6;  // conversion of 8bit registers to 16bit variable 


  		




  
  125
  
    
   


  		




  
  126
  
    
   return ( ((float) ADC_temperature - 498.0)/-5.35) + 25.0;  // return temperature in deg C


  		




  107
  127
  
    
}


  		




  108
  128
  
    

  		




  109
  129
  
    
void main()


  		




  ......




  113
  133
  
    
   output_high(CSN_SPI);


  		




  114
  134
  
    
   delay_ms(100); 


  		




  115
  135
  
    

  		




  116
  
  
    
   MPL_init();


  		




  
  136
  
    
   MPL_init();  // get correction coeffivcients from the sensor 


  		




  117
  137
  
    

  		




  118
  138
  
    
   while(true)


  		




  119
  139
  
    
   {


  		




  120
  
  
    
//   MPL_init();


  		




  121
  
  
    
      printf("%f \r\n", MPL_get_pressure());


  		




  122
  
  
    
//      printf("%ld %ld %ld %ld \r\n",a0, b1, b2, c12);


  		




  123
  
  
    
//MPL_get_pressure();


  		




  124
  
  
    

  		




  
  140
  
    
      printf("%f %f \r\n", MPL_get_pressure(), MPL_get_temperature());


  		




  125
  141
  
    
      delay_ms(500);


  		




  126
  142
  
    
   }


  		




  127
  143
  
    
}


  		










:@created_atf1432293713.9731841H¦:@expires_in0