From: Dave H. <dhy...@gm...> - 2007-04-02 14:25:34
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Hi Demetris, On 4/2/07, Demetris Zavorotnichenko <fgc...@cy...> wrote: > When using just the Comm Ports on Gumstix and the LCD pins on a custom board > do i have to set any pins high ? > > I have seen that on the Audio Stix Schematic pins : > > LDD15 > LDD14 > Y0_RXD > LDD12 > > have 10k resistor. going to a 3.3V supply > > Do i have to have this pins high for a normal operation ? You definitely need a pullup on the Y0_RXD line (aka FFRXD) or your gumstix may drop into u-boot a t boot time. Which schematics are you looking at? I can't find any pullups on LDD12, 14, 15 on the audiostix schematics. Perhaps you're referring to the roboaudiostix? In which case, the pullups are present to allow the roboaudiostix to operate correctly when no gumstix is plugged in. -- Dave Hylands Vancouver, BC, Canada http://www.DaveHylands.com/ |