//****************************************************************************** // MSP430F20x2 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 // // // MSP430F20x2 - // /|\| // || | // |RST XOUT|- // XIN|- | | // > -|P1.1/A1 | // > -|P1.0/A0 | // // L Westlund // Texas Instruments Inc // May 2006 // Built with CCE Version: 3.2.0 and IAR Embedded Workbench Version: 3.41A //****************************************************************************** #include "msp430x20x2.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; // Wait if ADC10 core is active // Data buffer start ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion ready bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will force exit _NOP(); // space for debugger _NOP(); // 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) ... #include "msp430x20x2. 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... select ADC10DTC1 = 0x20; // 16 conversions for (;;) { ADC10CTL0 &= ~ENC; while (ADC10CTL1 & BUSY); ADC10SA = 0x200; // Wait if ADC10 core is active // Data buffer start ADC10CTL0 |= ENC + ADC10SC;... LPM0, ADC10_ ISR will force exit _NOP(); // space for debugger _NOP(); // Set Breakpoint here to read ADC } } // ADC10 interrupt service routine #pragma vector =ADC10_ VECTOR interrupt void ADC10_ ISR