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Easy way to read Interrupt bits but not using interrupts?

 
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Skywalker



Joined: 11 Mar 2004
Posts: 5
Location: Germany/Ilmenau

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Easy way to read Interrupt bits but not using interrupts?
PostPosted: Wed Aug 04, 2004 1:47 am     Reply with quote
I want to look in the code serveral times after the interrupt bit for Timer0 overflow. I dont want to use an interrupt for that, but reading an resetting this bit manualy. Is there an easy way or have I to read write direkt to the register?

Thx

Skywalker
Ttelmah
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Re: Easy way to read Interrupt bits but not using interrupts
PostPosted: Wed Aug 04, 2004 1:56 am     Reply with quote
Skywalker wrote:
I want to look in the code serveral times after the interrupt bit for Timer0 overflow. I dont want to use an interrupt for that, but reading an resetting this bit manualy. Is there an easy way or have I to read write direkt to the register?

Thx

Skywalker

The 'easy way', is to write/read the register, but use the bit declaration. If (for instance), this is on a 18F PIC, the timer0 interrupt flag is bit 2 of the 'INTCON' register, which is at address 0xFF2. You can therefore code as:

#byte INTCON = 0xFF2
#bit TMR0IF = INTCON.2

Then to read/clear the flag, you can use code like:
Code:

if (TMR0IF) {
    TMR0IF=0;
    //Do whatever you want here now that the flag has been seen

}


It makes it plain what you are doing, and 'safe' (the access doesn't affect the other bits in the register).
You can't really get much easier!.
A while ago, somebody did post an 'include' file, containing definitions like this for just about every register and bit on the PIC. If you need to access more than just a couple of bits, it'd be worth searching the forum for this.

Best Wsihes
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