Date:2011-09-07 15:56:06 (7 years 9 months ago)
Author:Werner Almesberger
Commit:1152189acba568550b7b3567ade683fa971b4962
Message:labsw/LOG: theory that the failures to switch are caused by EMI (on buttons)

Files: labsw/LOG (1 diff)

Change Details

labsw/LOG
195195  - turn-on cycle: all LEDs green, no power (not a reset)
196196  - 5+ normal cycles
197197
198Further analysis: the absence of more abnormal states, such as LEDs
199contradicting relays or LEDs just going dark suggests that the problem
200is may not be USB data corruption. At least some of the symptoms would
201be compatible with EMI from switching the relay creating false signals
202on the buttons.
203
204The "all LEDs green" condition would be a false press of MAIN. The
205CH2 green condition would be harder to explain. Maybe the MAIN LED
206was also green and I didn't notice. In this case, it would have been
207a combination of the MAIN and CH1 buttons (MAIN to exit remote mode,
208turn off all the channels, and enable the channel buttons. Then CH1 to
209turn on CH1 again.)
210
211To do: debounce buttons (in software) before accepting a state change.
212
198213---------------------
199214
200215(next PCB run)

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