ADC10序列通道单次转换数据怎样使用

2019-03-24 13:27发布

//******************************************************************************
//  MSP430F21x2 Demo - ADC10, DTC Sample A2-0, AVcc, Single Sequence, DCO
//
//  Description: Sample A2/A1/A0 as single sequence with reference to AVcc.
//  Software sets ADC10SC to trigger sample sequence. In Mainloop MSP430 waits
//  in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC) will
//  force exit from any LPMx in Mainloop on reti. ADC10_ISR will force LPM0
//  exit. ADC10 internal oscillator times sample period (16x) and conversion
//  (13x). DTC transfers conversion code to RAM 200h - 206h. P1.0 set at start
//  of conversion burst, reset on completion.
//
//               MSP430F21x2
//            -----------------
//        /||              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//       >---|P2.2/A2      P1.0|-->LED
//       >---|P2.1/A1          |
//       >---|P2.0/A0          |
//
//  A. Dannenberg
//  Texas Instruments Inc.
//  December 2007
//  Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430x21x2.h"void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop WDT
  ADC10CTL1 = INCH_2 + CONSEQ_1;            // A2/A1/A0, single sequence
  ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE;
  ADC10DTC1 = 0x03;                         // 3 conversions
  ADC10AE0 |= 0x07;                         // P2.2,1,0 ADC10 option select
  P1DIR |= 0x01;                            // Set P1.0 output  for (;;)
  {
    ADC10CTL0 &= ~ENC;
    while (ADC10CTL1 & BUSY);               // Wait if ADC10 core is active
    ADC10SA = 0x200;                        // Data buffer start
    P1OUT |= 0x01;                          // P1.0 = 1
    ADC10CTL0 |= ENC + ADC10SC;             // Sampling and conversion start
    __bis_SR_register(CPUOFF + GIE);        // LPM0, ADC10_ISR will force exit
    P1OUT &= ~0x01;                         // P1.0 = 0
  }
}// ADC10 interrupt service routine
#pragma vector=ADC10_VECTOR
__interrupt void ADC10_ISR(void)
{
  __bic_SR_register_on_exit(CPUOFF);        // Clear CPUOFF bit from 0(SR)
}
这是官网上的一个示例,我想问下A2,A1,A0口的转换好的数据都放在哪了,该怎样调用转换好的数据呀,ADC10MEM好像只能存放一个数据吧,请各位帮忙指点下吧~~~ 此帖出自小平头技术问答
11条回答
wstt
2019-03-24 14:57
< ADC10MEM确实只放一个数据,每次转换完成ADC10IFG会置位一次,先是A2 然后A1 再是A0

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