My Code get crazy after i add interrupt
my Program is Working perfect after y add this code for counter
and now all is crazy (pic18f252)
' Define interrupt handler
DEFINE INTHAND myint 'Assembly language interrupt handler
wsave VAR BYTE bankA system ' Saves W
ssave VAR BYTE bankA system ' Saves STATUS
TICK VAR BYTE bankA ' make sure that the variables are in bank 0 if they are to be used in the interrupt handler
seconds VAR BYTE ' Elapsed seconds
minutes VAR WORD ' Elapsed minutes
minutes = 0 ' Clear time
seconds = 0
T1CON = $01 ' Turn on Timer1, prescaler = 1
INTCON = $C0 ' Enable global interrupts, peripheral interrupts
PIE1 = $01 ' Enable TMR1 overflow interrupt
' Assembly language interrupt handler
Asm
myint
; Save the state of critical registers
movwf wsave ; Save W
swapf STATUS, W ; Swap STATUS to W (swap avoids changingATUS)
clrf STATUS ; Clear STATUS
movwf ssave ; Save swapped STATUS
; Set the high register of Timer1 to cause an interrupt every
; 16384 counts (65536-16384=49152 or $C000). At 4MHz, prescale
; set to 1, this equates to a tick every 16384uS. This works
; out to about 61 ticks per second, with a slight error. The
; error could be reduced substantially by setting the TMR1L
; register and playing with different values for the prescaler
; and the ticks per second.
movlw 0C0h ; Prepare to set TMR1 high register
movwf TMR1H ; Set TMR1H to C0h
incf _TICK,F ; INCREMENT TICK COUNT
bcf PIR1, 0 ; Clear interrupt flag
swapf ssave, W ; Retrieve the swapped STATUS value (swap to avoid anging STATUS)
movwf STATUS ; Restore it to STATUS
swapf wsave, F ; Swap the stored W value
swapf wsave, W ; Restore it to W (swap to avoid changing STATUS)
retfie ; Return from interrupt
EndAsm
get_time:
' Update the time when needed. The TICK variable will
' overflow if you don't update within 4 seconds. This could
' be done in the interrupt handler, but it's easier to do
' it in PicBasic, and you usually want the interrupt handler
' to be as short and fast as possible.
PIE1 = 0 ' Mask the interrupt while we're messing with TICK
seconds = seconds + (tick/61) ' Add the accumulated seconds
tick = tick // 61 ' Retain the left-over ticks
PIE1 = $01 ' Interrupt on again
minutes = minutes + (seconds / 60) ' Add the accumulated minutes
seconds = seconds // 60 ' Retain the left-over seconds
Return ' Return to the main program
