msp430x20x2 adc10 07

Software // writes to ADC10SC to trigger sample burst.. In Mainloop MSP430 waits in LPM0 // to save power until ADC10 conversion burst complete, ADC10_ISRDTC will // force exit from any

//****************************************************************************** // MSP430F20x2 Demo - ADC10, DTC Sample A1 32x, AVcc, Repeat Single, DCO

//

// Description: Use DTC to sample A1 32 times with reference to AVcc Software

// writes to ADC10SC to trigger sample burst In Mainloop MSP430 waits in LPM0

// to save power until ADC10 conversion burst complete, ADC10_ISR(DTC) 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 P1.0 set at start of conversion burst, reset on

// completion

//

// MSP430F20x2

//

-// /|\|

XIN|-// | | |

// |RST

XOUT|-// | |

// > -|P1.1/A1 P1.0| >LED

//

// 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 = CONSEQ_2 + INCH_1; // Repeat single channel, A1

ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE; // ADC10ON, interrupt enabl ADC10DTC1 = 0x20; // 32 conversions

ADC10AE0 |= 0x02; // P1.1 ADC option select

P1DIR |= 0x01; // Set P1.0 to output direction

for (;;)

{

ADC10CTL0 &= ~ENC;

while (ADC10CTL1 & BUSY); // Wait if ADC10 core is active

ADC10SA = 0x200; // Data buffer start

P1OUT |= 0x01; // Set P1.0 LED on

ADC10CTL0 |= ENC + ADC10SC; // Sampling and conversion start

bis_SR_register(CPUOFF + GIE); // LPM0, ADC10_ISR will force exit

P1OUT &= ~0x01; // Clear P1.0 LED off

}

}

// 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) }