From a42bf172917506b086951465cb7938e949f192ea Mon Sep 17 00:00:00 2001 From: Werner Almesberger Date: Wed, 7 Sep 2011 04:24:05 -0300 Subject: [PATCH] labsw/LOG: added more details on occasional labsw malfunction --- labsw/LOG | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/labsw/LOG b/labsw/LOG index 0bef6ab..57ddefa 100644 --- a/labsw/LOG +++ b/labsw/LOG @@ -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