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 f
Trang 1//****************************************************************************** // 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; // Sampling and conversion start while (ADC10CTL1 & ADC10BUSY); // ADC10BUSY?
if (ADC10MEM < 0x311) // ADC10MEM = A11 > 0.65?
P1OUT |= 0x01; // Set P1.0 LED on
else
P1OUT &= ~0x01; // Clear P1.0 LED off
}
}