[求助] MSP430f5系列，使用ADC12模块测芯片内部温度

闻风小城 2016-8-17 15:32 楼主

volatile long temp;
volatile long IntDegF;
volatile long IntDegC;

int main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
  ADC12CTL0 = ADC12SHT0_8 + ADC12REFON + ADC12ON;
                                          // Internal ref = 1.5V
  ADC12CTL1 = ADC12SHP;                   // enable sample timer
  ADC12MCTL0 = ADC12SREF_1 + ADC12INCH_10;  // ADC i/p ch A10 = temp sense i/p
  ADC12IE = 0x001;                         // ADC_IFG upon conv result-ADCMEMO
  __delay_cycles(37);                      // 35us delay to allow Ref to settle
                                          // based on default DCO frequency.
                                          // See Datasheet for typical settle
                                          // time.
  ADC12CTL0 |= ADC12ENC;

  while(1)
  {
ADC12CTL0 |= ADC12SC;                // Sampling and conversion start

__bis_SR_register(LPM4_bits + GIE);    // LPM0 with interrupts enabled
__no_operation();

// Temperature in Celsius
// ((A10/4096*1500mV) - 894mV)*(1/3.66mV) = (A10/4096*410) - 244
// = (A10 - 2438) * (410 / 4096)
IntDegC = ((temp - 2438) * 410) / 4096;

// Temperature in Fahrenheit
// ((A10/4096*1500mV) - 829mV)*(1/2.033mV) = (A10/4096*738) - 408
// = (A10 - 2264) * (738 / 4096)
IntDegF = ((temp - 2264) * 738) / 4096;
__no_operation();                      // SET BREAKPOINT HERE
  }
}

#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(ADC12_VECTOR))) ADC12ISR (void)
#else
#error Compiler not supported!
#endif
{
  switch(__even_in_range(ADC12IV,34))
  {
  case  0: break;                         // Vector  0:  No interrupt
  case  2: break;                         // Vector  2:  ADC overflow
  case  4: break;                         // Vector  4:  ADC timing overflow
  case  6:                               // Vector  6:  ADC12IFG0
temp = ADC12MEM0;                      // Move results, IFG is cleared
__bic_SR_register_on_exit(LPM4_bits); // Exit active CPU
break;
  case  8: break;                         // Vector  8:  ADC12IFG1
  case 10: break;                         // Vector 10:  ADC12IFG2
  case 12: break;                         // Vector 12:  ADC12IFG3
  case 14: break;                         // Vector 14:  ADC12IFG4
  case 16: break;                         // Vector 16:  ADC12IFG5
  case 18: break;                         // Vector 18:  ADC12IFG6
  case 20: break;                         // Vector 20:  ADC12IFG7
  case 22: break;                         // Vector 22:  ADC12IFG8
  case 24: break;                         // Vector 24:  ADC12IFG9
  case 26: break;                         // Vector 26:  ADC12IFG10
  case 28: break;                         // Vector 28:  ADC12IFG11
  case 30: break;                         // Vector 30:  ADC12IFG12
  case 32: break;                         // Vector 32:  ADC12IFG13
  case 34: break;                         // Vector 34:  ADC12IFG14
  default: break;
  }
}

请问：
// Temperature in Celsius
1. // ((A10/4096*1500mV) - 894mV)*(1/3.66mV) = (A10/4096*410) - 244 此处的894mv和3.66mv是什么含义？以及后面的410和244
// Temperature in Fahrenheit
2.// ((A10/4096*1500mV) - 829mV)*(1/2.033mV) = (A10/4096*738) - 408  同理，此处的829mv和2.033mv是表示什么，等号右边的738和408是什么意思