***TI公司的MSP430F5529的A/D轉(zhuǎn)換模塊在P1.6輸入端，名稱為ADC12，是用12位數(shù)字寄存器保存轉(zhuǎn)換結(jié)果的AD轉(zhuǎn)換器。
 ***轉(zhuǎn)換有兩個(gè)參考電壓，最高電壓VR+，最低電壓VR-作為轉(zhuǎn)換的上下限，高于等于VR+輸出0FFF，小于等于VR-輸出0000，待轉(zhuǎn)換模擬電壓Vin轉(zhuǎn)換后的數(shù)字量計(jì)算為Data=4095  x   （Vin-VR-）/（VR+ -VR-），程序結(jié)構(gòu)如下


 
#include "msp430F5529.h"
int tt=0,temp,kk;
void delay(int ns)
{
  while(ns--);
}
//******A/D轉(zhuǎn)換函數(shù)設(shè)置*****//
void adc1()
{
 P1SEL |=BIT6;       //轉(zhuǎn)換模擬信號(hào)從P1.6輸入，內(nèi)部集成了轉(zhuǎn)換模塊
 ADC12CTL0 =ADC12ON  + ADC12SHT0_8 + ADC12MSC;
 ADC12CTL1 =ADC12SHP + ADC12CONSEQ_2;
 ADC12MCTL0=ADC12SREF_0+ADC12INCH_6;
 ADC12CTL0 |=ADC12ENC;
//////一次轉(zhuǎn)換結(jié)束后產(chǎn)生轉(zhuǎn)換中斷調(diào)用ADC中斷函數(shù)////
}

 // Timer1 interrupt service routine
 #pragma vector=TIMER1_A0_VECTOR
 __interrupt void TIMER1_A0_ISR(void)
 {
 
   if(kk==50)
   {
     kk=0;
   P1OUT ^= 0x01;// Toggle P1.0
   }
    else kk++;
                           
    TA1CCR0 += 10000;                         // 重裝
 }
#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR(void)
{
   //讀取轉(zhuǎn)換結(jié)果喲
    tt=ADC12MEM0; //轉(zhuǎn)換數(shù)據(jù)存在12位ADC12MEM0寄存器中
}
 ADC12有18個(gè)中斷源，ADC12IFG0----ADC12IFG15、溢出中斷源ADC12OV、ADC12MEMx
ADC12TOV、ADC12_A 轉(zhuǎn)換時(shí)間溢出。
當(dāng)ADC12MEMx存入轉(zhuǎn)換結(jié)果的時(shí)候，響應(yīng)的ADC12IFGx位被置位（變1），響應(yīng)的ADC12IEx位和GIE位也置位產(chǎn)生中斷請(qǐng)求。
   


 

//******************************************************************************
//  MSP430G2x33/G2x53 Demo - ADC10, Sample A1, 1.5V, TA1 Trig, Set P1.0 if > 0.5V
//
//  Description: A1 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 A1 > 0.5Vcc, P1.0 is set,
//  else reset. Normal mode is LPM3.
//  //* An external watch crystal on XIN XOUT is required for ACLK *//
//
//               MSP430G2x33/G2x53
//            -----------------
//        /|\|              XIN|-
//         | |                 | 32kHz
//         --|RST          XOUT|-
//           |                 |
//       >---|P1.1/A1     P1.0 |--> LED
//
//  D. Dang
//  Texas Instruments Inc.
//  December 2010
//   Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10
//******************************************************************************
#include  "msp430g2553.h"
void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  ADC10CTL1 = SHS_1 + CONSEQ_2 + INCH_1;    // TA1 trigger sample start
  ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON + ADC10IE;
  __enable_interrupt();                     // Enable interrupts.
  TACCR0 = 30;                              // Delay to allow Ref to settle
  TACCTL0 |= CCIE;                          // Compare-mode interrupt.
  TACTL = TASSEL_2 + MC_1;                  // TACLK = SMCLK, Up mode.
  LPM0;                                     // Wait for delay.
  TACCTL0 &= ~CCIE;                         // Disable timer Interrupt
  __disable_interrupt();
  ADC10CTL0 |= ENC;                         // ADC10 Enable
  ADC10AE0 |= 0x02;                         // P1.1 ADC10 option select
  P1DIR |= 0x01;                            // Set P1.0 output
  TACCR0 = 2048-1;                          // PWM Period
  TACCTL1 = OUTMOD_3;                       // TACCR1 set/reset
  TACCR1 = 2047;                            // TACCR1 PWM Duty Cycle
  TACTL = TASSEL_1 + MC_1;                  // ACLK, up mode
  __bis_SR_register(LPM3_bits + GIE);       // Enter LPM3 w/ interrupts
}
// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
  if (ADC10MEM < 0x155)                     // ADC10MEM = A1 > 0.5V?
    P1OUT &= ~0x01;                         // Clear P1.0 LED off
  else
    P1OUT |= 0x01;                          // Set P1.0 LED on
}
#pragma vector=TIMER0_A0_VECTOR
__interrupt void ta0_isr(void)
{
  TACTL = 0;
  LPM0_EXIT;                                // Exit LPM0 on return
}

相關(guān)文章