 | | H8300 Stack and SLEEP
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| Hi All, If this is old news, ignore it... I just figured out this weekend (thanks Kekoa) that the H8/300 stack pointer (r7) and the power-down function in the RCX have a close relationship. The stack pointer MUST be in the on-chip RAM area (0xFD80 (...) (26 years ago, 15-Mar-99, to lugnet.robotics.rcx.legos, lugnet.robotics.rcx.pbforth, lugnet.robotics)
| | | | | Re: H8300 Stack and SLEEP
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| (...) After talking with Ralph over the weekend, I suggested a test he might do to figure out if port 5 bit 2 really does what he suggested it might. I don't think he did this test, so I fired up my RCX and hacked it together. I verified that port 5 (...) (26 years ago, 16-Mar-99, to lugnet.robotics.rcx.legos, lugnet.robotics.rcx.pbforth, lugnet.robotics)
| | | | | RE: H8300 Stack and SLEEP
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| Kekoa wrote: <<snipped original description of problem>> (...) <<snipped description of tests>> Once again, Kekoa goes the extra mile and proves what many of us are happy to be merely confident about. Someday, I'd like to be reincarnated as a grad (...) (26 years ago, 16-Mar-99, to lugnet.robotics.rcx.legos, lugnet.robotics.rcx.pbforth, lugnet.robotics)
| | | | | Re: H8300 Stack and SLEEP
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| Sorry I'm late. I believe this is not an issue with legOS. legOS only calls the ROM powerdown function at the end of its kmain() loop, where the stack pointer should be in the on-chip RAM area anyway. When sleeping in the idle task, legOS directly (...) (26 years ago, 20-Mar-99, to lugnet.robotics.rcx.legos)
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