fet120_adc10_03.c

一个基于TI的MSP430的程序设计参考代码

//*****************************************************************************
//  MSP-FET430P120 Demo - ADC10 Sample A10 Temp Set P1.0 if temp ++ ~2c 
//
//  Descriptiion: se ADC10 and the integrated temperature sensor to detect
//  temperature gradients. The temperature sensor output voltage is sampled
//  ~ every 80ms and compared with the defined delta values using an ISR.
//  (ADC10OSC/4)/64 determines sample time which needs to be greater than 
//  30us for temperature sensor. 
//  ADC10 is operated in repeat-single channel mode with the sample and 
//  convert trigger sourced from Timer_A CCR1. The ADC10IFG at the end
//  of each converstion will trigger an ISR.
//  ACLK = n/a, MCLK = SMCLK = default DCO ~ 800k, ADC10CLK = ADC10OSC
//                MSP430F1232
//
//             -----------------
//         /|\|              XIN|-  
//          | |                 |
//          --|RST          XOUT|-
//            |                 |
//            |A10          P1.0|-->LED
//
//  M. Buccini
//  Texas Instruments Inc.
//  Jannuary 2004
//  Updated for IAR Embedded Workbench Version: 2.21B
//*****************************************************************************
#include <msp430x12x2.h>

static unsigned int FirstADCVal;        // holds 1st ADC result

#define ADCDeltaOn       3              // ~ 2 Deg C delta for LED on

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;             // Stop watchdog
  ADC10CTL1 = ADC10DIV_3 + INCH_10 + SHS_1 + CONSEQ_2;  // TA trig., rpt conv. a10
  ADC10CTL0 = SREF_1 + ADC10SHT_3 + REF2_5V + ADC10IE + REFON + ADC10ON + ENC;  
  TACCTL1 = OUTMOD_4;                   // Toggle on EQU1 (TAR = 0)
  TACTL = TASSEL_2 + MC_2;              // SMCLK, cont-mode
  while (!(ADC10IFG & ADC10CTL0));      // First conversion?
  FirstADCVal = ADC10MEM;               // Read out 1st ADC value
  P1OUT = 0x00;                         // Clear P1
  P1DIR = 0x01;                         // P1.0 as output
  _BIS_SR(LPM0_bits + GIE);             // Enter LPM0 w/ interrupt
}

#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
    if (ADC10MEM >= FirstADCVal + ADCDeltaOn)
      P1OUT |= 0x01;                    // LED on
    else { P1OUT &= ~0x01; }            // LED off
}