fet120_adc10_13.c

一个基于TI的MSP430的程序设计参考代码

//******************************************************************************
//  MSP-FET430P120 Demo - ADC10/DTC Sample A1 32x, AVcc, TA0 Trigger, DCO 
//
//  Description; A1 is sampled in 32x burst using DTC 16/second 
//  (ACLK/2048) with reference to Avcc. All.  Activity is interrupt driven. 
//  Timer_A in upmode uses TA0 toggle to drive ADC10 conversion. Sample burst 
//  is automatically triggered by TA0 rising edge every 16 ACLK cycles. 
//  ADC10_ISR will exit from LPM3 mode and return CPU active. Internal ADC10OSC 
//  times sample (16x) and conversion (13x). DTC transfers conversion code to 
//  RAM 200h - 240h. In the Mainloop P1.0 is toggled. 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|-
//           |                 |
//       >---|A1          P1.0 |--> LED
//
//  M.Buccini
//  Texas Instruments, Inc
//  February 2004
//  Updated for IAR Embedded Workbench Version: 2.21B
//******************************************************************************

#include  <msp430x12x2.h>

void main(void)
{ 
  WDTCTL = WDTPW + WDTHOLD;             // Stop WDT
  ADC10CTL1 = INCH_1 + SHS_2 + CONSEQ_2;  // TA0 trigger
  ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE; 
  ADC10DTC1 = 0x20;                     // 32 conversions   
  P1DIR |= 0x01;                        // Set P1.0 output
  ADC10AE |= 0x02;                      // P2.1 ADC10 option select 
  CCR0 = 1024-1;                        // PWM Period 
  CCTL0 = OUTMOD_4;                     // CCR0 toggle
  TACTL = TASSEL_1 + MC_1;              // ACLK, up mode

  for (;;)                              
  {
    ADC10CTL0 &= ~ENC;                   
    while (ADC10CTL1 & BUSY);           // Wait if ADC10 core is active
    ADC10SA = 0x200;                    // Data buffer start
    ADC10CTL0 |= ENC + ADC10SC;         // Sampling and conversion ready
    _BIS_SR(LPM3_bits + GIE);           // Enter LPM3, enable interrupts
    P1OUT ^= 0x01;                      // Toggle P1.0 using exclusive-OR
  }
}

// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR (void)
{
    _BIC_SR_IRQ(LPM3_bits);             // Clear LPM3 bits from 0(SR)
}