官网上的一个示例问题

1万 · 2013-5-14 19:57

就是这个
//******************************************************************************
//  MSP430F21x2 Demo - ADC10, DTC Sample A2-0, AVcc, Single Sequence, DCO
//
//  Description: Sample A2/A1/A0 as single sequence with reference to AVcc.
//  Software sets ADC10SC to trigger sample sequence. In Mainloop MSP430 waits
//  in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC) will
//  force exit from any LPMx in Mainloop on reti. ADC10_ISR will force LPM0
//  exit. ADC10 internal oscillator times sample period (16x) and conversion
//  (13x). DTC transfers conversion code to RAM 200h - 206h. P1.0 set at start
//  of conversion burst, reset on completion.
//
//             MSP430F21x2
//          -----------------
//       /|\|             XIN|-
//       | |                |
//       --|RST       XOUT|-
//          |                |
//    >---|P2.2/A2    P1.0|-->LED
//    >---|P2.1/A1       |
//    >---|P2.0/A0       |
//
//  A. Dannenberg
//  Texas Instruments Inc.
//  December 2007
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x21x2.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;                // Stop WDT
ADC10CTL1 = INCH_2 + CONSEQ_1;          // A2/A1/A0, single sequence
ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE;
ADC10DTC1 = 0x03;                      // 3 conversions
ADC10AE0 |= 0x07;                      // P2.2,1,0 ADC10 option select
P1DIR |= 0x01;                         // Set P1.0 output
for (;;)
{
   ADC10CTL0 &= ~ENC;
   while (ADC10CTL1 & BUSY);             // Wait if ADC10 core is active
   ADC10SA = 0x200;                      // Data buffer start
   P1OUT |= 0x01;                         // P1.0 = 1
   ADC10CTL0 |= ENC + ADC10SC;          // Sampling and conversion start
   __bis_SR_register(CPUOFF + GIE);       // LPM0, ADC10_ISR will force exit
   P1OUT &= ~0x01;                      // P1.0 = 0
}
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
__bic_SR_register_on_exit(CPUOFF);       // Clear CPUOFF bit from 0(SR)
}