hi all,
having problem with measurement of pulse width.i am generating a
PWM at P1.2 and loping it back to timer B catpure input pin at P4.2.
need to capture the width.
it is not going to the ISR for timerB
#include "msp430x13x.h"
TOP_FRONT EQU 0200h
TOP_TRAIL EQU 0204h
ORG 0F000h
RESET mov.w #0A00h,SP
Main CALL #INIT
mov.b &TOP_FRONT,R6
mov.b &TOP_TRAIL,R7
sub.b R6,R7
here jmp here
INIT
mov.w #WDTPW+WDTHOLD,&WDTCTL
mov.w #TASSEL1+TACLR,&TACTL ; SMCLK, Clear TAR
mov.w #512-1,&CCR0 ; PWM Period
mov.w #OUTMOD_7,&CCTL1 ; CCR1 reset/set
mov.w #384,&CCR1 ; CCR1 PWM Duty Cycle
bis.b #004h,&P1DIR
bis.b #004h,&P1SEL
bic.b #004h,&P1DIR
bis.b #004h,&P1SEL
BIC #CCIFG,&CCTL2 ;CLEAR PENDING INTS
BIS
#CCIE+CAP+CM0,&CCTL2 ;ENABLE ;INT/CAP/RISING/SOURCE=PIN
bis.w #MC0,&TACTL ; Start Timer_A in up mode
eint
ret
TB2INT:
BIC #CCIFG,&CCTL2
BIT #CM0,&CCTL2
JZ TTRAIL
MOV &TBR,&TOP_FRONT
XOR #CM1+CM0,&CCTL2
RETI
TTRAIL:
MOV &TBR,&TOP_TRAIL
XOR #CM1+CM0,&CCTL2
RETI
ORG 0FFF2h
DW TB2INT
ORG 0FFFEh
DW RESET
end