Posted on December 03, 2002 at 04:16 Dear All,
I am new of ST MCU. Now I use the ST7 visual debug simulator to implement a PWM funciton on ST7Lite But I found there was some problem. I can not look at the wave form in ST7 wave form editor. could anyone help me?
the part source code are as bellows:
main
call init ; port initialization
call init_pwm
.loop jra loop
.init
ld A, $1F
ld PADDR, A ; configures port A[0..4] as output
ld PAOR, A
ld A, $07
ld PBDDR, A ; configures port B[0..2] as output
ld PBOR, A
ld A, $23 ; enables the A/D peripheral on PB3
ld ADCCSR, A
ret
.init_pwm
ld A,0 ; 0 0 0 0 0 0 OP0 CMPF0
ld PWM0CSR,A ; bit 1 set the PWM invert or noinvert
ld A,8
ld ATRH
ld A,0
ld ATRL,A ;set ART, ie. set the PWM frequency
ld A,15
ld A,DCR0H
ld A,1
ld DCR0L,A ;Set PWM duty cycle
ld A,$10
ld ATCSR,A ;
ld A,1
ld PWMCR,A ;bit 0=1 PWM output enabled.
ret
segment 'vectit'
DC.W 0 ; FFE0-FFE1h
DC.W 0 ; FFE2-FFE3h
DC.W 0 ; FFE4-FFE5h
DC.W 0 ; FFE6-FFE7h
DC.W 0 ; FFE8-FFE9h
DC.W 0 ; FFEA-FFEBh
DC.W 0 ; FFEC-FFEDh
DC.W 0 ; FFEE-FFEFh
DC.W 0 ; FFF0-FFF1h
DC.W 0 ; FFF2-FFF3h
DC.W 0 ; FFF4-FFF5h
DC.W 0 ; FFF6-FFF7h
DC.W 0 ; FFF8-FFF9h
DC.W 0 ; FFFA-FFFBh
DC.W 0 ; FFFC-FFFDh
DC.W main
