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 | | 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: Idle process
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| I guess my earlier posting got out after all. I got the message from the NNTP server telling me to register. That is why a slightly different version of my message appears later in the group. (...) I plan to keep the idle task, now that I understand (...) (26 years ago, 11-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | Re: Idle process
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| (...) The idle task actually has the lowest priority in my scheme, but there was some efficiency gained in making the task list loop around. If the idle task is always there, it makes for simplified code in multitasking startup if you rely on that. (...) (26 years ago, 11-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | Re: Idle process
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| Sorry this message is so late, I had to get registered for posting from my work address. (...) I, too, consider power saving to be a valuable (indispensible) feature. That is precisely the sort of thing that I feared I might be overlooking. Up 'till (...) (26 years ago, 11-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | Re: Idle process
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| (...) I, too, consider power saving to be a valuable (indispensible) feature. That is precisely the sort of thing that I feared I might be overlooking. Up 'till now, I had not worked on an embedded project which would benefit from using (...) (26 years ago, 9-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | Re: Idle process
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| Hi Lou, the sleep instruction effectively shuts down the CPU until the next interrupt occurs. Thus, the idle process conserves battery power if no task wishes to run. I consider this a worthwile feature. If you can do this without a dedicated idle (...) (26 years ago, 8-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | Idle process
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| I am reworking parts of the task scheduler in tm.c, tm.h, et al. I notice, reading the code, that there is an idle process which runs all of the time. There is a note in tm.c; "execi needs pd_idle". It appears to use it to locate the head of the (...) (26 years ago, 7-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | Scheduler
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| Is anybody doing work on the scheduler (tm.c et al)? I've got some ideas for a minor rewrite and don't want to collide with anybody else's efforts. -- No honest business is promoted by spam with the possible exception of Hormel. (26 years ago, 2-Mar-99, to lugnet.robotics.rcx.legos)
| | | | | A few notes...
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| Ha! Just completed my first LegOS program - and it only took a month! (off and on :) ) I'm going to note some things which stalled me, in the hope that they won't stall anyone else.. (1) I was trying to count how long the sensor was being pressed (...) (26 years ago, 28-Feb-99, to lugnet.robotics.rcx.legos)
| | | | | enhancing the motor driver
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| Hi all, I couldn't resist the urge to do something productive after taking the exam today. Dan sent me some code offering 256 levels of power, and I hacked away at it. I played around with the assembler, and here's my new version. It adheres to the (...) (26 years ago, 24-Feb-99, to lugnet.robotics.rcx.legos)
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