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labsw/LOG: added more details on occasional labsw malfunction

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This commit is contained in:
Werner Almesberger 2011-09-07 04:24:05 -03:00
parent 757f19cd7b
commit a42bf17291
1 changed files with 8 additions and 3 deletions
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labsw/LOG
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@ -174,9 +174,14 @@ Pending:
3) drive opto LEDs from 3.3 V instead of 5 V (NOT ! Regulator
can only provide 100 mA, which wouldn't be enough if more than
two opto-couplers are active.)
- labsw occasionally gets some configuration bits wrong. This may be
a problem with the power supply or with USB. Consider some or all of
the following improvements:
- labsw occasionally gets some configuration bits wrong. The pattern
observed so far it that, in an attempt to turn on CH1, then CH2, CH1
comes on normally while CH2 either doesn't come on at all or the
relay switches but the LED doesn't.
This may be a problem with the power supply or with USB. Consider
some or all of the following improvements:
- follow SiLab's recommendations for regulator bypassing more closely
- enable the VDD monitor to catch brown-outs
- add ground areas to shield CPU and USB