msp430x20x2 adc10 14

Software sets ADC10SC to trigger sample burst.. // In Mainloop MSP430 waits in LPM0 to save power until ADC10 conversion // complete, ADC10_ISR will force exit from any LPMx in Mainloop

//****************************************************************************** // MSP430F20x2 Demo - ADC10, DTC Sample A1-0 16x, AVcc, Repeat Seq, DCO

//

// Description: Use DTC to sample A1/A0 repeat sequence 16x(32 total samples)

// with reference to AVcc Software sets ADC10SC to trigger sample burst

// In Mainloop MSP430 waits in LPM0 to save power until ADC10 conversion

// complete, ADC10_ISR 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 ADC10(DTC) interrupt

// will return system active P1.0 set at start of conversion burst, reset

// on completion

//

// MSP430F20x2

//

-// /|\|

XIN|-// | | |

// |RST

XOUT|-// | |

// > -|P1.1/A1 |

// > -|P1.0/A0 |

//

// 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_1 + CONSEQ_3; // A1/A0, repeat multi channel

ADC10CTL0 = ADC10SHT_2 + MSC + ADC10ON + ADC10IE;

ADC10AE0 = 0x03; // P1.0,1 ADC option select

ADC10DTC1 = 0x20; // 16 conversions

for (;;)

{

ADC10CTL0 &= ~ENC;

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

ADC10SA = 0x200; // Data buffer start

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

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

_NOP(); // space for debugger

_NOP(); // Set Breakpoint here to read ADC

}

}

// 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) }