msp430g2x31 adc10 02 asm

Software sets ADC10SC to start sample and conversion - ADC10SC ; automatically cleared at EOC.. ADC10 internal oscillator times sample 16x ; and conversion.. In Mainloop MSP430 waits in

; MSP430G2x31 Demo - ADC10, Sample A1, 1.5V Ref, Set P1.0 if A1 > 0.2V

;

; Description: A single sample is made on A1 with reference to internal

; 1.5V Vref Software sets ADC10SC to start sample and conversion - ADC10SC

; automatically cleared at EOC ADC10 internal oscillator times sample (16x)

; and conversion 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 If A1 > 0.2V, P1.0 set, else reset

;

; MSP430G2x31

;

-; /|\|

XIN|-; | | |

; |RST

XOUT|-; | |

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

;

; D Dang

; Texas Instruments Inc

; October 2010

; Built with Code Composer Essentials Version: 4.2.0

;******************************************************************************* .cdecls C,LIST, "msp430g2231.h"

.text ; Progam Start

; -RESET mov.w #0280h,SP ; Initialize stackpointer

StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT

SetupADC10 mov.w #SREF_1+ADC10SHT_2+REFON+ADC10ON+ADC10IE,&ADC10CTL0;

mov.w #30,&TACCR0 ; Delay to allow Ref to settle

bis.w #CCIE,&TACCTL0 ; Compare-mode interrupt

mov.w #TACLR+MC_1+TASSEL_2,&TACTL; up mode, SMCLK

bis.w #LPM0+GIE,SR ; Enter LPM0, enable interrupts bic.w #CCIE,&TACCTL0 ; Disable timer interrupt

dint

bis.b #02h,&ADC10AE0 ; P1.1 ADC10 option select

mov.w #INCH_1, &ADC10CTL1 ; A1 input

SetupP1 bis.b #001h,&P1DIR ; P1.0 output

Mainloop bis.w #ENC+ADC10SC,&ADC10CTL0 ; Start sampling/conversion

bis.w #CPUOFF+GIE,SR ; LPM0, ADC12 ISR will force exit bic.b #01h,&P1OUT ; P1.0 = 0

cmp.w #088h,&ADC10MEM ; ADC10MEM = A1 > 0.2V?

jlo Mainloop ; Again

bis.b #01h,&P1OUT ; P1.0 = 1

jmp Mainloop ; Again

; -TA0_ISR; ISR for TACCR0

clr.w &TACTL ; Clear Timer_A control registers bic.w #LPM0,0(SP) ; Exit LPM0, interrupts enabled reti ;

; -ADC10_ISR; Exit LPM0 on reti

bic.w #LPM0,0(SP) ; Exit LPM0, interrupts enabled reti ;

; -; Interrupt Vectors

.sect ".reset" ; MSP430 RESET Vector

short RESET ;

sect ".int05" ; ADC10 Vector .short ADC10_ISR ;

sect ".int09" ; Timer_A0 Vector .short TA0_ISR ;

end