msp430g2x31 adc10 05
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//******************************************************************************
// MSP430G2x31 Demo - ADC10, Sample A11, Lo_Batt, Set P1.0 if < 2.3V
//
// Description: A single sample is made on A11 (AVcc/2) with reference to
// internal 1.5V Vref. Software sets ADC10SC to start sample and conversion
// - ADC10SC automatically cleared at EOC. ADC10 internal oscillator times
// sample (16x) and conversion. ADC10BUSY flag is polled for EOC. If A11
// (AVcc/2) < 0311h (0.65V) indicating AVcc is less 2.3V, P1.0 set indicating
// a lo_Batt condition, else reset.
//
//
MSP430G2x31
//
----------------//
/|\|
XIN|//
| |
|
//
--|RST
XOUT|//
|
|
//
|A11
P1.0|-->LED
//
// 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 = INCH_11;
// AVcc/2
ADC10CTL0 = SREF_1 + ADC10SHT_2 + REFON + ADC10ON;
P1DIR |= 0x01;
// Set P1.0 to output direction
}
for (;;)
{
ADC10CTL0 |= ENC + ADC10SC;
while (ADC10CTL1 & ADC10BUSY);
if (ADC10MEM < 0x311)
P1OUT |= 0x01;
else
P1OUT &= ~0x01;
}
//
//
//
//
Sampling and conversion start
ADC10BUSY?
ADC10MEM = A11 > 0.65?
Set P1.0 LED on
// Clear P1.0 LED off
