Subject:
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Re: 8 bit timer problem
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 19 May 2005 18:43:37 GMT
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Viewed:
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5243 times
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In lugnet.robotics.rcx, Martin Toft wrote:
> This is my interrupt handler:
>
> void handler(void)
> {
> asm("push r0 \n\t" // Save registers
> "push r1 \n\t" // CCR and r6 are saved by
> "push r2 \n\t" // ROM dispatcher
> "push r3 \n\t"
> "push r4 \n\t"
> "push r5 \n\t"
> "bset #7, @0x80:8 \n\t" // Start motor A
> "bclr #6, @0xc3:8 \n\t" // Clear CMFA
> // (bit 6 of
> // TCSR)
> "pop r5 \n\t" // Restore registers
> "pop r4 \n\t"
> "pop r3 \n\t"
> "pop r2 \n\t"
> "pop r1 \n\t"
> "pop r0"
> );
> }
>
> I expect motor A to start when the interrupt is
> requested by the timer, but nothing happens. At
> this point I am very lost :( Does somebody have a
> solution for the riddle?
Looks like a typo - try this in your handler instead:
"bclr #6, @0xc9:8 \n\t" // Clear CMFA
// (bit 6 of
// TCSR)
I haven't really checked the rest of the code for
anything else, though.
HTH,
Mark
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Message has 1 Reply:
Message is in Reply To:
 | | 8 bit timer problem
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| Hi I am a member of a project group at Aalborg University, Denmark, and the goal for our project on this semester is to code an operating system for the RCX brick from Lego. During a whole week, I have been strugling with the 8 bit timers of the (...) (20 years ago, 19-May-05, to lugnet.robotics.rcx)
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