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 LPM
Trang 1; MSP430G2x31 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
;
; 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 ; Program Start
; -RESET mov.w #0280h,SP ; Initialize stackpointer
StopWDT mov.w #WDTPW+WDTHOLD,&WDTCTL ; Stop WDT
SetupADC10 mov.w #CONSEQ_2+INCH_1,&ADC10CTL1 ; Repeat single channel, A1 mov.w #ADC10SHT_2+MSC+ADC10ON+ADC10IE,&ADC10CTL0 ;
bis.b #02h,&ADC10AE0 ; P1.1 ADC option select
mov.b #020h,&ADC10DTC1 ; 32 conversions
SetupP1 bis.b #001h,&P1DIR ; P1.0 output
;
Mainloop bic.w #ENC,&ADC10CTL0 ;
busy_test bit #BUSY,&ADC10CTL1 ; ADC10 core inactive?
jnz busy_test ;
mov.w #0200h,&ADC10SA ; Data buffer start
bis.b #001h,&P1OUT ; P1.0 = 1
bis.w #ENC+ADC10SC,&ADC10CTL0 ; Sampling and conversion start bis.w #CPUOFF+GIE,SR ; LPM0, ADC10_ISR will force exit bic.b #001h,&P1OUT ; P1.0 = 0
jmp Mainloop ; Again
;
; -ADC10_ISR; Exit LPM0 on reti
bic.w #CPUOFF,0(SP) ; Exit LPM0 on reti
reti ;
;
; -; Interrupt Vectors
.sect ".reset" ; MSP430 RESET Vector
short RESET ;
sect ".int05" ; ADC10 Vector
short ADC10_ISR ;
end