msp430x20x2 adc10 16

//******************************************************************************
// 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;

// 1 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