ADC.rar_Programming with C

//****************************************************************************** // MSP430xG461x Demo - ADC12, Sample A0, Set P5.1 if A0 > 0.5*AVcc // // Description: A single sample is made on A0 with reference to AVcc. // Software sets ADC12SC to start sample and conversion - ADC12SC // automatically cleared at EOC. ADC12 internal oscillator times sample (16x) // and conversion. In Mainloop MSP430 waits in LPM0 to save power until ADC12 // conversion complete, ADC12_ISR will force exit from LPM0 in Mainloop on // reti. If A0 > 0.5*AVcc, P5.1 set, else reset. // ACLK = 32kHz, MCLK = SMCLK = default DCO 1048576Hz, ADC12CLK = ADC12OSC // // MSP430xG461x // ----------------- // /|\| XIN|- // | | | 32kHz // --|RST XOUT|- // | | // Vin -->|P6.0/A0 P5.1|--> LED // //****************************************************************************** #include "msp430fg4618.h" void main(void) { WDTCTL = WDTPW + WDTHOLD; // Stop WDT ADC12CTL0 = SHT0_2 + ADC12ON; // Sampling time, ADC12 on ADC12CTL1 = SHP; // Use sampling timer ADC12IE = 0x01; // Enable interrupt ADC12CTL0 |= ENC; P6SEL |= 0x01; // P6.0 ADC option select P5DIR |= 0x02; // P5.1 output while (1) { ADC12CTL0 |= ADC12SC; // Start sampling/conversion __bis_SR_register(LPM0_bits + GIE); // LPM0, ADC12_ISR will force exit } } #pragma vector = ADC12_VECTOR __interrupt void ADC12_ISR(void) { if (ADC12MEM0 >= 0x7ff) // ADC12MEM = A0 > 0.5AVcc? P5OUT |= 0x02; // P5.1 = 1 else P5OUT &= ~0x02; // P5.1 = 0 __bic_SR_register_on_exit(LPM0_bits); // Exit LPM0 }