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Michael Zucchi

 B.E. (Comp. Sys. Eng.)

  also known as zed
  & handle of notzed

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Saturday, 17 April 2010, 22:01

Timers

Finally got timers `worked out' - i'd played with it before but couldn't get it to work - but it turned out that the code was basically fine, but I had a bug in the irq `enable' routine ... der. They are really rather simple devices that work much the same in almost all microprocessors ever made ..., so it was a bit embarrassing it took this long.

It's using the 32 768Hz clock - which means you have to use some extra hardware logic to get a true 1Khz divisor, but the manual explains that pretty clearly as referenced in the source.

Source is in irq-timer.c.

I'm at the point in WoofƆs that I need at least one timer to get much further so it seemed a good time to poke it into puppybits. I managed to squeeze in a little time to play with WoofƆs over the last few nights and got the code that i'd written a few days ago to load and run - after a stack of mucking about as usual. It doesn't do much - with the trivial round-robin scheduler and no interrupts once the memserver task goes to sleep the idle task starts and is never pre-empted :). I had some linking issues, but the main problem was that for some silly reason I was calling some assembly from C as a function *pointer* not a function and it took me far too long to spot it.

But there's an excuse this time. It's been a really long week - 49 hours of work, quite a few very late nights, an on-site meeting I had to wake up at 7am for, a couple of midnight meetings for GSOC - one of which I missed because I fell asleep, and then I woke up at 2am and didn't crash again till after 8am this morning. Not sure 'tired' covers it. The sunrise wasn't bad though.

Tagged os, puppybits.
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