Subject:
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NOTE 04/10/97 10:50:15
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 10 Apr 1997 15:50:10 GMT
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Original-From:
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Ericson Mar <EMAR@CSFBG.CSFB.spamlessCOM>
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Reply-To:
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<EMAR@CSFBG.CSFB.COMsaynotospam>
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Viewed:
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1359 times
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Hi,
Can someone help me understand encoders.asm?
This is what I deduced from the code and I'm wondering if my guess is
correct.
1. When TIC3 and TIC2 inputs are changed, an "interrupt" in execution
occurs and and execution immediately jumps to the address stored at
the location TIC3INT and TIC2INT. (In this case, Port0_ShaftInt,
Port1_ShaftInt)
2. But for the interrupt to actually execute, TLFLG1 must allow it.
For TIC3 and TIC2, this must be true:
TLFLG1 = %XXXXXXX1 -> TIC3 change causes an interrupt
TLFLG1 = %XXXXXX1X -> TIC2 change causes an interrupt
TLFLG1 becomes %-------1 and %------1- on TIC3 and TIC2 changes
respectively. So each bit must be turned off by the line
BCLR TLFLG1,X %11111110 and
BCLR TLFLG1,X %11111101 respectively,
otherwise, the interrupt will keept on executing after the very first
change in state of TIC3 or TIC2, respectively.
3. TCLT2 stores a byte which when set to %00001111, makes the TIC3 and
TIC2 interrupts happen when either inputs change state from 0 to 1.
(What is at TCLT2 to make it interrupt on a 1 to 0 change?)
So, am I understanding the code correctly, or am I just hallucinating.
:)
Thanks for any help.
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Message has 1 Reply:
 | | Re: NOTE 04/10/97 10:50:15
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| OK, I haven't looked at encoders.asm but if the following doesn't help just send more questions. (...) Sounds about right. (...) TCTL2 sets rising, falling, or both edge modes; TMSK1 arms interupts; IC event sets the TFLG1 register. (...) correct (...) (27 years ago, 14-Apr-97, to lugnet.robotics.handyboard)
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