fet120_adc10_14.c

一个基于TI的MSP430的程序设计参考代码

//******************************************************************************
//   MSP-FET430P120 Demo - ADC10/DTC Sample A1-0 32x, AVcc, Repeat Mode, DCO 
//
//  Description; Use DTC to sample A1/A0 repeat sequence 32x(64 total samples)
//  with refernce to AVcc.  Software sets ADC10SC to trigger sample burst.
//  In Mainloop MSP430 waits in LPM0 to save power until ADC10 conversion 
//  complete, ADC10_ISR will force exit from any LPMx in Mainloop on reti. 
//  ADC10 internal oscillator times sample period (16x) and conversion (13x). 
//  DTC transfers conversion code to RAM 200h - 280h.  ADC10(DTC) interrupt 
//  will return system active. P1.0 set at start of conversion burst, reset 
//  on completion. 
//  //*MSP430F1232 or MSP430F1132 Device Required *//
//
//               MSP430F1232
//            -----------------
//        /|\|              XIN|-  
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//       >---|A1           P1.0|-->LED
//       >---|A0
//
//  M.Buccini
//  Texas Instruments, Inc
//  February 2004
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  <msp430x12x2.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  ADC10CTL1 = INCH_1 + CONSEQ_3;        // A1/A0, repeat multi channel
  ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE; 
  ADC10AE = 0x03;                       // P2.0,1 ADC option select 
  ADC10DTC1 = 0x40;                     // 40 conversions   
  P1DIR |= 0x01;                        // Set P1.0 output

  for (;;)                              
  {
    P1OUT |= 0x01;                      // Set P1.0 LED on
    ADC10CTL0 &= ~ENC;                   
    while (ADC10CTL1 & BUSY);           // Wait if ADC10 core is active
    ADC10SA = 0x200;                    // Data buffer start
    ADC10CTL0 |= ENC + ADC10SC;         // Sampling and conversion ready
    _BIS_SR(CPUOFF + GIE);              // LPM0, ADC10_ISR will force exit
    P1OUT &= ~0x01;                     // Clear P1.0 LED off
  }
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
    _BIC_SR_IRQ(CPUOFF);                // Clear CPUOFF bit from 0(SR)
}