fet430_adc12_11.c

msp430开发c语言例程

//******************************************************************************
//  MSP-FET430P430 Demo - ADC12, Single Conversion on Channel A12
// 
//  This example shows how to perform a single ADC12 conversion on a single 
//  channel. It uses AVcc for the reference and performs a single conversion on 
//  channel A12. The conversion results are stored in ADC12MEM0. Test by 
//  applying a voltage to channel A12, then setting and running to a break point 
//  at the "_NOP()" instruction. To view the conversion results, open an SFR 
//  window in C-Spy and view the contents of ADC12MEM0.
//
//               MSP430FG439
//             ---------------
//            |               |
//            |     A12 (P5.1)|<---- Vin
//            |               |
//
//
//  M.Mitchell
//  Texas Instruments, Inc
//  June 2004
//  Built with IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include          "msp430xG43x.h"        // Standard Equations

void main(void)
{ 
  WDTCTL = WDTPW+WDTHOLD;               // Stop watchdog timer
  P5SEL |= 0x02;                        // Enable A/D channel A0
  ADC12CTL0 = ADC12ON+SHT0_2;           // Turn on ADC12, set sampling time
  ADC12CTL1 = SHP;                      // Use sampling timer
  ADC12MCTL0 = INCH_12;                 // input channel A12
  ADC12CTL0 |= ENC;                     // Enable conversions
   
  while (1)
  { 
    ADC12CTL0 |= ADC12SC;               // Start conversion
    while ((ADC12IFG & BIT0)==0);
    _NOP();                             // SET BREAKPOINT HERE
  }                           
}