hi Serge i totally agree with what you said On Thursday, July 31, 2014 11:07:41 AM UTC+5:30, serge...@gmail.com wrote: > > > > On Thursday, July 31, 2014 12:39:42 AM UTC+6, Brandon I wrote: >> >> The gpio are push pull/pseudo open drain, so there's a transistor/switch >> going from 3.3V to the pin,... >> >> > At boot time the respective Sitara pins become outputs high/low level as > needed. > Then, please never assume your GPIO is tri-state. > > > In theory you may connect 3.3v power line direct to the pin if: > 1) you are sure it is not used at boot time as the output > 2) it is 3.3v domain power related pin. > > Feel free to ground the pin if: > 1) you are sure it is never used at boot time as an output, and you never > drive it High. > > > To live safe and feel happy always add pulling resistors, never connect > pin to the VCC or GND dorectly. >
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