[*]I measured for about 5minutes on CHA and CHB. then I disconnected cables, the wave form on the display just freeze (the menus were working fine). I had to restart the quad. Edit: had this error again, btw mode is RUN and not HOLD
[*]I confirm the delta voltage bug
[*]on the stock firmware a 1mhz spi signal looks like this: http://neophob.com/wp-content/uploads/2012/03/spi-1mhz-lpd6803-arduino-clockonly.png. now if I look at the same signal with your firmware it looks like the stock firmware at the 5uS time value. however if i'm using a time value of 10mS the signal starts oscillating, see the attached screenshot. this was NOT visible on the stock firmware, I *guess* thats a bug?
[*]the firmware suffer (like the stock firmware) of a non existing blue color channel if a screenshot is saved.
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[*]signal generator, there is no difference for the rect/sin/saw generator between 20khz and 50khz
thanks again for you time and effort!