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labsw/LOG: theory that the failures to switch are caused by EMI (on buttons)

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Werner Almesberger 2011-09-07 10:56:06 -03:00
parent 37df000637
commit 1152189acb
1 changed files with 15 additions and 0 deletions
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@ -195,6 +195,21 @@ Rework:
- turn-on cycle: all LEDs green, no power (not a reset)
- 5+ normal cycles
Further analysis: the absence of more abnormal states, such as LEDs
contradicting relays or LEDs just going dark suggests that the problem
is may not be USB data corruption. At least some of the symptoms would
be compatible with EMI from switching the relay creating false signals
on the buttons.
The "all LEDs green" condition would be a false press of MAIN. The
CH2 green condition would be harder to explain. Maybe the MAIN LED
was also green and I didn't notice. In this case, it would have been
a combination of the MAIN and CH1 buttons (MAIN to exit remote mode,
turn off all the channels, and enable the channel buttons. Then CH1 to
turn on CH1 again.)
To do: debounce buttons (in software) before accepting a state change.
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(next PCB run)