fet120_adc10_11.c

一个基于TI的MSP430的程序设计参考代码

//******************************************************************************
//  MSP-FET430P120 Demo - ADC10 Sample A0, 1.5V, TA1 Trigger Set P1.0 if > 0.5V  
//
//  Description; A0 is sampled 16/second (ACLK/2048) with reference to 1.5V. 
//  Timer_A is run in upmode and TA1 is used to automatically trigger
//  ADC10 conversion, TA0 defines the period. Internal oscillator times sample
//  (16x) and conversion (13x). Inside ADC10_ISR if A0 > 0.5Vcc, P1.0 is set, 
//  else reset. Normal mode is LPM3.
//  //*An external watch crystal on XIN XOUT is required for ACLK*//	  
//  //*MSP430F1232 or MSP430F1132 Device Required*//
//
//               MSP430F1232
//            -----------------
//        /|\|              XIN|-  
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//       >---|A0          P1.0 |--> LED
//
//  M.Buccini
//  Texas Instruments, Inc
//  October 2003
//  Built with IAR Embedded Workbench Version: 1.26B
//  December 2003
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  "msp430x12x2.h"

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  ADC10CTL1 = SHS_1 + CONSEQ_2;        	// TA1 trigger sample start
  ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
  ADC10CTL0 |= ENC;			// ADC10 Enable 
  ADC10AE |= 0x01;                      // P2.0 ADC10 option select 
  P1DIR |= 0x01;                        // Set P1.0 output
  CCR0 = 2048-1; 	                // PWM Period 
  CCTL1 = OUTMOD_3; 		        // CCR1 set/reset
  CCR1 = 2047;                          // CCR1 PWM Duty Cycle	  
  TACTL = TASSEL_1 + MC_1;              // ACLK, up mode

  _BIS_SR(LPM3_bits + GIE);             // Enter LPM3 w/ interrupts
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
  if (ADC10MEM < 0x155)                 // ADC10MEM = A0 > 0.5V?
  P1OUT &= ~0x01;                       // Clear P1.0 LED off
  else
  P1OUT |= 0x01;                        // Set P1.0 LED on
}