//****************************************************************************** // 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