msp430x20x2 adc10 14

//******************************************************************************
// MSP430F20x2 Demo - ADC10, DTC Sample A1-0 16x, AVcc, Repeat Seq, DCO
//
// Description: Use DTC to sample A1/A0 repeat sequence 16x(32 total samples)
// with reference to AVcc. Software sets ADC10SC to trigger sample burst.
// In Mainloop MSP430 waits in LPM0 to save power until ADC10 conversion
// complete, ADC10_ISR will force exit from any LPMx in Mainloop on reti.
// ADC10 internal oscillator times sample period (16x) and conversion (13x).
// DTC transfers conversion code to RAM 200h - 240h. ADC10(DTC) interrupt
// will return system active. P1.0 set at start of conversion burst, reset
// on completion.
//
//
//

MSP430F20x2
-----------------

//

/|\|

//

||

|

//

--|RST

XOUT|-

//

XIN|-

|

|

//

>---|P1.1/A1

|

//

>---|P1.0/A0

|

//
// L. Westlund
// Texas Instruments Inc.
// May 2006
// Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A

//******************************************************************************
#include "msp430x20x2.h"

void main(void)
{
WDTCTL = WDTPW + WDTHOLD;

// Stop WDT

ADC10CTL1 = INCH_1 + CONSEQ_3;

// A1/A0, repeat multi channel

ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE;
ADC10AE0 = 0x03;

// P1.0,1 ADC option select

ADC10DTC1 = 0x20;

// 16 conversions

for (;;)
{
ADC10CTL0 &= ~ENC;
while (ADC10CTL1 & BUSY);
ADC10SA = 0x200;

// Wait if ADC10 core is active
// Data buffer start

ADC10CTL0 |= ENC + ADC10SC;

// Sampling and conversion ready

__bis_SR_register(CPUOFF + GIE);

// LPM0, ADC10_ISR will force exit

_NOP();

// space for debugger

_NOP();

// Set Breakpoint here to read ADC

}
}

// 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)