msp430g2x31 adc10 04

//******************************************************************************
// MSP430G2x31 Demo - ADC10, Sample A1, Signed, Set P1.0 if > 0.5*AVcc
//
// Description: A single sample is made on A1 with SIGNED reference to AVcc.
// Software sets ADC10SC to start sample and conversion - ADC10SC
// automatically cleared at EOC. ADC10 internal oscillator times sample (16x)
// and conversion. 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. If A1 > 0.5*AVcc, P1.0 set, else reset.
//
//
MSP430G2x31
//
----------------//
/|\|
XIN|//
| |
|
//
--|RST
XOUT|//
|
|
//
>---|A1/P.1
|
//
// D. Dang
// Texas Instruments Inc.
// October 2010
// Built with CCS Version 4.2.0 and IAR Embedded Workbench Version: 5.10

//******************************************************************************
#include "msp430g2231.h"
void main(void)
{
WDTCTL = WDTPW + WDTHOLD;
// Stop WDT
ADC10CTL1 = ADC10DF + INCH_1;
// Conversion code singed format,
input A1
ADC10CTL0 = ADC10SHT_2 + ADC10ON + ADC10IE; // ADC10ON, interrupt enabled
ADC10AE0 |= 0x02;
// P1.0 ADC option select
P1DIR |= 0x01;
// Set P1.0 to output direction
for (;;)
{
ADC10CTL0 |= ENC + ADC10SC;
__bis_SR_register(CPUOFF + GIE);
if ((int)ADC10MEM < 0)
P1OUT &= ~0x01;
else
P1OUT |= 0x01;
}

// Sampling and conversion start
// LPM0, ADC10_ISR will force exit
// Clear P1.0 LED off
// Set P1.0 LED on

}

// 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)