msp430xg46x_adc12_09.c

MSP430FG461x.zip c语言 例程打包

//******************************************************************************
//  MSP430xG461x Demo - ADC12, Sequence of Conversions (non-repeated)
//
//  This example shows how to perform A/D conversions on a sequence of channels.
//  A single sequence of conversions is performed - one conversion each on
//  channels A0, A1, A2, and A3. Each conversion uses AVcc and AVss for the
//  references. The conversion results are stored in ADC12MEM0, ADC12MEM1,
//  ADC12MEM2, and ADC12MEM3 respectively and are moved to Results[] upon
//  completion of the sequence. Test by applying voltages to pins A0, A1, A2,
//  and A3, then setting and running to a break point at the "__no_operation()"
//  instruction in the ISR. To view the conversion results, open a watch window
//  with the debugger and view Results[] or view ADC12MEM0, ADC12MEM1,
//  ADC12MEM2, and ADC12MEM3 in a register window.
//  ACLK = n/a, MCLK = SMCLK = default DCO, ADC12CLK = ADC12OSC
//
//  Note that a sequence has no restrictions on which channels are converted.
//  For example, a valid sequence could be A0, A3, A2, A4, A2, A1, A0, and A7.
//  See the MSP430x4xx User's Guide for instructions on using the ADC12
//  ACLK = 32kHz, MCLK = SMCLK = default DCO 1048576Hz, ADC12CLK = ADC12OSC
//
//              MSP430xG461x
//            -----------------
//           |              XIN|-
//   Vin0 -->|P6.0/A0          | 32kHz
//   Vin1 -->|P6.1/A1      XOUT|-
//   Vin2 -->|P6.2/A2          |
//   Vin3 -->|P6.3/A3          |
//           |                 |
//
//   A. Dannenberg/ M. Mitchell
//   Texas Instruments Inc.
//   October 2006
//   Built with IAR Embedded Workbench Version: 3.41A
//******************************************************************************
#include "msp430xG46x.h"

volatile unsigned int Results[4];

void main(void)
{
  WDTCTL = WDTPW + WDTHOLD;                 // Stop watchdog timer
  P6SEL = 0x0F;                             // Enable A/D channel inputs
  ADC12CTL0 = ADC12ON + MSC + SHT0_2;       // Turn on ADC12, set sampling time
  ADC12CTL1 = SHP + CONSEQ_1;               // Use sampling timer, single sequ
  ADC12MCTL0 = INCH_0;                      // ref+=AVcc, channel = A0
  ADC12MCTL1 = INCH_1;                      // ref+=AVcc, channel = A1
  ADC12MCTL2 = INCH_2;                      // ref+=AVcc, channel = A2
  ADC12MCTL3 = INCH_3 + EOS;                // ref+=AVcc, channel = A3, end seq
  ADC12IE = 0x08;                           // Enable ADC12IFG.3
  ADC12CTL0 |= ENC;                         // Enable conversions
  __enable_interrupt();                     // Enable interrupts

  while(1)
  {
    ADC12CTL0 |= ADC12SC;                   // Start conversion
    __bis_SR_register(LPM0_bits);           // Enter LPM0
  }
}

#pragma vector=ADC12_VECTOR
__interrupt void ADC12ISR (void)
{
  Results[0] = ADC12MEM0;                   // Move results, IFG is cleared
  Results[1] = ADC12MEM1;                   // Move results, IFG is cleared
  Results[2] = ADC12MEM2;                   // Move results, IFG is cleared
  Results[3] = ADC12MEM3;                   // Move results, IFG is cleared
  __no_operation();                         // SET BREAKPOINT HERE
  __bic_SR_register_on_exit(LPM0_bits);     // Exit LPM0
}