//****************************************************************************** // MSP430F20x2 Demo - ADC10, DTC Sample A0 -> TA1, AVcc, DCO // // Description: Use DTC to sample A0 with reference to AVcc and directly // transfer code to TACCR1 Timer_A has been configured for 10-bit PWM mode // TACCR1 duty cycle is automatically proportional to ADC10 A0 WDT_ISR used // as a period wakeup timer approximately 45ms based on default ~1.2MHz // DCO/SMCLK clock source used in this example for the WDT clock source // Timer_A also uses default DCO // // // MSP430F20x2 - // /|\| // || | // |RST XOUT|- // // XIN|- | > -|P1.0/A0 | P1.2| > TACCR1 - 0-1024 PWM // // 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 = WDT_MDLY_32; IE1 |= WDTIE; // WDT ~45ms interval timer // Enable WDT interrupt ADC10CTL0 = ADC10SHT_2 + ADC10ON; ADC10AE0 |= 0x01; // P1.0 ADC option select ADC10DTC1 = 0x001; // conversion P1DIR |= 0x04; // P1.2 = output P1SEL |= 0x04; // P1.2 = TA1 output TACCR0 = 1024 - 1; // PWM Period TACCTL1 = OUTMOD_7; TACCR1 = 512; // TACCR1 reset/set // TACCR1 PWM Duty Cycle TACTL = TASSEL_2 + MC_1; // SMCLK, upmode while(1) { bis_SR_register(LPM0_bits + GIE); ADC10SA = (unsigned int)&TACCR1; ADC10CTL0 |= ENC + ADC10SC; } } #pragma vector = WDT_VECTOR interrupt void WDT_ISR(void) { // LPM0, WDT_ISR will force exit // Data transfer location // Start sampling bic_SR_register_on_exit(LPM0_bits); } // Exit LPM0 ... WDTIE; // WDT ~45ms interval timer // Enable WDT interrupt ADC10CTL0 = ADC10SHT_2 + ADC10ON; ADC10AE0 |= 0x01; // P1.0 ADC option select ADC10DTC1 = 0x001; // conversion P1DIR |= 0x04; // P1.2 =... MC_1; // SMCLK, upmode while(1) { bis_SR_register(LPM0_bits + GIE); ADC10SA = (unsigned int)&TACCR1; ADC10CTL0 |= ENC + ADC10SC; } } #pragma vector = WDT_VECTOR interrupt void WDT_ISR(void)