; 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
Trang 1; MSP430F20x2 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 *//
;
; MSP430F20x2
;
-; /|\|
XIN|-; | | | 32kHz
; |RST
XOUT|-; | |
; > -|P1.1/A1 P1.0| > LED
;
; L Westlund
; Texas Instruments Inc
; May 2006
; Built with IAR Embedded Workbench Version: 3.41A
;*******************************************************************************
#include "msp430x20x2.h"
RSEG CSTACK ; Define stack segment
RSEG CODE ; Assemble to Flash memory
; -RESET mov.w #SFE(CSTACK),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 ;
Trang 2;
COMMON INTVEC ; Interrupt Vectors
ORG ADC10_VECTOR ; ADC10 Vector
DW ADC10_ISR
ORG TIMERA0_VECTOR ; Timer_A0 Vector
DW TA0_ISR
ORG RESET_VECTOR ; POR, ext Reset
DW RESET
END