msp430x20x2 adc10 16

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 de

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

//

-// /|\|

XIN|-// | | |

// |RST

XOUT|-// | |

// > -|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; // WDT ~45ms interval timer IE1 |= WDTIE; // Enable WDT interrupt

ADC10CTL0 = ADC10SHT_2 + ADC10ON;

ADC10AE0 |= 0x01; // P1.0 ADC option select

ADC10DTC1 = 0x001; // 1 conversion

P1DIR |= 0x04; // P1.2 = output

P1SEL |= 0x04; // P1.2 = TA1 output

TACCR0 = 1024 - 1; // PWM Period

TACCTL1 = OUTMOD_7; // TACCR1 reset/set

TACCR1 = 512; // TACCR1 PWM Duty Cycle

TACTL = TASSEL_2 + MC_1; // SMCLK, upmode

while(1)

{

bis_SR_register(LPM0_bits + GIE); // LPM0, WDT_ISR will force exit ADC10SA = (unsigned int)&TACCR1; // Data transfer location ADC10CTL0 |= ENC + ADC10SC; // Start sampling

}

}

#pragma vector = WDT_VECTOR

interrupt void WDT_ISR(void)

{

bic_SR_register_on_exit(LPM0_bits); // Exit LPM0 }