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interupt 0 on pic18f4620

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igeorge

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I have problem starting iterrupt 0
I setup the following interrupt routine and i have on the display settup to see the counter running
When i start, nothing happen
timer does not start
I am using Mikrobasic from Mikroelectronica, but any sugestion will be good, and i can implement it
here is the initialization at start program
Code: 
      INTCON.7 = 1             'GIE IS SET == GLOBAL INTRRUPT ENABLE BIT
      INTCON.2 = 0             ' START TIMER
      INTCON2.2 = 1            'TMR0IP SET TO 1 ;TIMER 0 INTERUPT PRIORITY ==HIGH
      RCON.7 = 1               'INTERUPT PRIORITY ENABLE IPEN SET TO 1
      T0CON.7 = 1              'ENABLE TIMER 0 ; IF 0 STOP TIMER 0
      T0CON.6 = 0              'SET TO 16 BITS
      T0CON.5 = 0              'SELECT INTERNAL CLOCK
      T0CON.3 = 0              'IT WILL USE THE PRESCALLER
then this is the interrupt service routine
Code: 
    sub procedure interrupt ' Define interrupt subprocedure
        IF TMR0IF = 1 THEN
           cnt = cnt +1            ' Increment variable cnt by 1
           INTCON.2 = 0
           TMR0L = 0
           TMR0H = 0
        end if
    end sub                 ' End of interrupt routine


and this is the display of the counter
Code: 
         if cnt > 2000 then
            porte.1 = 1
            delay_ms(600)
            porte.1 = 0
            cnt = 0
            TMR0L = 0
            TMR0H = 0
         end if
the counter is dead.

Please help
Thank you
Ion
 
Last edited:

Thank you very much !!!
It does work now.
Do you have any idea or example ( better) how to use the interrupt for usart receive ?
I get data from usart receive , while the program is stuck in a loop doing something, and for this i miss the data.
I need an interrupt to tell me that i have data, read it , assign it to a variable ,then go back
Example will be GREAT
Thank you
Ion
 

I would suggest you to look at Microchip site, where you can get a number of examples!!. You have to configure USART Tx & Rx interrupts. You should also configure correct baud rate.
 
Thank you , I will look.
The bad part with Microchip is that they give you examples on C or assembler, and i do not know any of them
I read and set the interrupts for usart, but i do not know what to write inside ISR and extraxt data from RCREG to a variable which i can use it.
Regards
Ion
 

Solved:
Here is the working code
Code: 
    sub procedure interrupt
        IF PIR1.RCIF = 1 THEN     'if flag is on
           Rval = RCREG
           if Rval = 9 then Rwdt = 1         end if
           if (Rval <> 9) then TravelOUT = Rval end if
           pir1.rcif = 0          'clear flag
        end if
        IF INTCON.TMR0IF = 1 THEN
           cnt = cnt +1            'Increment variable cnt by 1
           INTCON.TMR0IF = 0       'REFET FLAG
           TMR0L = 0               'LOAD TIMER LOW BYTE
           TMR0H = 0               'LOAD TIMER HIGH BYTE
           if cnt = 1000 then cnt = 0 end if
         end if
    end sub                        'End of interrupt routine
 

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