//****************************************************************************** // MSP430G2x31 Demo - ADC10, DTC Sample A1-0 16x, AVcc, Repeat Seq, DCO // // Description: Use DTC to sample A1/A0 repeat sequence 16x(32 total samples) // with reference to AVcc Software sets ADC10SC to trigger sample burst // 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 // ADC10 internal oscillator times sample period (16x) and conversion (13x) // DTC transfers conversion code to RAM 200h - 240h ADC10(DTC) interrupt // will return system active P1.0 set at start of conversion burst, reset // on completion // // MSP430G2x31 // // /|\| XIN|// | | | // |RST XOUT|// | | // > -|P1.1/A1 | // > -|P1.0/A0 | // // 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_1 + CONSEQ_3; // A1/A0, repeat multi channel ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE; ADC10AE0 = 0x03; // P1.0,1 ADC option select ADC10DTC1 = 0x20; // 16 conversions for (;;) { ADC10CTL0 &= ~ENC; while (ADC10CTL1 & BUSY); ADC10SA = 0x200; ADC10CTL0 |= ENC + ADC10SC; bis_SR_register(CPUOFF + GIE); _NOP(); _NOP(); } // // // // // // Wait if ADC10 core is active Data buffer start Sampling and conversion ready LPM0, ADC10_ISR will force exit space for debugger Set Breakpoint here to read ADC } // 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)