msp430x20x2 adc10 10

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

//****************************************************************************** // MSP430F20x2 Demo - ADC10, DTC Sample A2-0, AVcc, Single Sequence, DCO

//

// Description: Sample A3/A2/A1 as single sequence with reference to AVcc

// Software sets ADC10SC to trigger sample sequence In Mainloop MSP430 waits

// in LPM0 to save power until ADC10 conversion complete, ADC10_ISR(DTC) will

// force exit from any LPMx in Mainloop on reti ADC10_ISR will force any LPMx

// exit ADC10 internal oscillator times sample period (16x) and conversion

// (13x) DTC transfers conversion code to RAM 200h - 206h P1.0 set at start

// of conversion burst, reset on completion

//

// MSP430F20x2

//

-// /|\|

XIN|-// | | |

// |RST

XOUT|-// | |

// > -|P1.3/A3 P1.0| >LED

// > -|P1.2/A2 |

// > -|P1.1/A1 |

//

// 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_3 + CONSEQ_1; // A3/A2/A1, single sequence

ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE;

ADC10DTC1 = 0x03; // 3 conversions

ADC10AE0 |= 0x0E; // P1.3,2,1 ADC10 option select

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

for (;;)

{

ADC10CTL0 &= ~ENC;

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

ADC10SA = 0x200; // Data buffer start

P1OUT |= 0x01; // P1.0 = 1

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

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

P1OUT &= ~0x01; // P1.0 = 0

}

}

// 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) }