msp430g2x31 adc10 11 asm

; Timer_A is run in upmode and TA1 is used to automatically trigger ; ADC10 conversion, TA0 defines the period.. Internal oscillator times sample ; 16x and conversion 13x.. Normal mode i

; MSP430G2x31 Demo - ADC10, Sample A1, 1.5V, TA1 Trig, Set P1.0 if > 0.5V

;

; Description: A1 is sampled 16/second (ACLK/2048) with reference to 1.5V

; Timer_A is run in upmode and TA1 is used to automatically trigger

; ADC10 conversion, TA0 defines the period Internal oscillator times sample

; (16x) and conversion (13x) Inside ADC10_ISR if A1 > 0.5Vcc, P1.0 is set,

; else reset Normal mode is LPM3

; //* An external watch crystal on XIN XOUT is required for ACLK *//

;

; MSP430G2x31

;

-; /|\|

XIN|-; | | | 32kHz

; |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 #SHS_1+CONSEQ_2+INCH_1,&ADC10CTL1 ; TA1 trigger sample start 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 ; Disable Interrupts

bis.w #ENC,&ADC10CTL0 ; ADC10 enable set

bis.b #002h,&ADC10AE0 ; P1.1 ADC10 option select

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

SetupC0 mov.w #2048-1,&TACCR0 ; PWM Period

SetupC1 mov.w #OUTMOD_3,&TACCTL1 ; TACCR1 set/reset

mov.w #2047,&TACCR1 ; TACCR1 PWM Duty Cycle

SetupTA mov.w #TASSEL_1+MC_1,&TACTL ; ACLK, up mode

;

Mainloop bis.w #LPM3+GIE,SR ; Enter LPM3

nop ; Required only for debugger

;

; -TA0_ISR; ISR for TACCR0

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

reti ;

; -ADC10_ISR;

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

cmp.w #0155h,&ADC10MEM ; ADC10MEM = A1 > 0.5V?

jlo ADC10_Exit ; Again

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

ADC10_Exit 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