Subject:
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Re: [long] Interrupt programming, buggy code
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Tue, 2 Mar 2004 18:57:30 GMT
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Viewed:
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3258 times
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In lugnet.robotics.rcx, Mark Riley wrote:
> Also, the C compiler that generated the ROM code uses a different calling
> convention than GCC and r6 is trashed by the debug_value() call. GCC isn't
> expecting this, so it may be prudent to wrap calls to debug_value() with a push
> and pop of r6. It won't cause a problem in your current code because the ROM
> dispatch code already preserves r6 for your ISR.
Eh... Never mind this bit. I just had a gander at Kekoa's rcxlib and he
already handles this correctly in debug_value(). Should've known! :-)
Mark
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Message is in Reply To:
 | | Re: [long] Interrupt programming, buggy code
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| Hi Benjamin, When you declare your ISR as an interrupt_handler, GCC terminates the function with an "rte" instead of an "rts". The ROM code that dispatches the interrupt to your function is already doing the rte so your function should not. Here's (...) (21 years ago, 2-Mar-04, to lugnet.robotics.rcx)
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