fet120_adc10_07.c

MSP-FET430P120 C语言例子程序

//******************************************************************************
//  MSP-FET430P120 Demo - Sample A0 64x, AVcc, Repeat Single DTC/DCO
//
//  Description; Use DTC to sample A0 64 times with reference to AVcc. Software  
//  writes to ADC10SC to trigger sample burst. In Mainloop MSP430 waits in LPM0
//  to save power until ADC10 conversion burst complete, ADC10_ISR(DTC) 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. P1.0 set at start of conversion burst, reset on
//  completion. 
//  //*MSP430F1232 or MSP430F1132 Device Required*//
//
//                MSP430F1232
//             -----------------
//         /|\|              XIN|-  
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//        >---|A0           P1.0|-->LED
//
//  M.Buccini
//  Texas Instruments, Inc
//  January 2002
//  Built with IAR Embedded Workbench Version: 1.25A
//******************************************************************************

#include  <msp430x12x2.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  ADC10CTL1 = CONSEQ_2;                 // Repeat single channel
  ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE; // ADC10ON, interrupt enabled
  ADC10DTC1 = 0x40;                     // 64 conversions   
  ADC10AE |= 0x01;                      // P2.0 ADC option select 
  P1DIR |= 0x01;                        // Set P1.0 to output direction
  
  for (;;)                              
  {
    ADC10CTL0 &= ~ENC;                  // 
    while ((ADC10CTL1 & BUSY) == BUSY); // ADC10 core must be inactive
    ADC10SA = 0x200;                    // Data buffer start
    P1OUT |= 0x01;                      // Set P1.0 LED on
    ADC10CTL0 |= ENC + ADC10SC;         // Sampling and conversion start
    _BIS_SR(CPUOFF + GIE);              // LPM0, ADC12 ISR will force exit
    P1OUT &= ~0x01;                     // Clear P1.0 LED off
  }
}

// ADC10 interrupt service routine
interrupt[ADC10_VECTOR] void ADC10_ISR (void)
{
    _BIC_SR_IRQ(CPUOFF);                // Clear CPUOFF bit from 0(SR)
}