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Configuring GPIO pins using Linux 3.0 kernel on DM3730

Chris Cope
Prodigy 55 points
Other Parts Discussed in Thread: DM3730

Hi Everyone

I'm having trouble configuring GPIO I/O lines on my Torpedo DM3730 chip for both input and output.  I have been following a set of instructions from LogicPD [support.logicpd.com/downloads/1534/] concering the use of the 'sysfs' gpio library interface.

No software errors are encountered and I have checked that gpiolib is correctly configured during kernel compilation.....attempted on 4 seperate GPIO pins but can never seem to output the required 1.8V logic signal or read in any logic signals as input.

More info about what I have been attempting is on this WIKI: http://www.armadeus.com/wiki/index.php?title=GPIOlib

Any help would be fantastic

 

Thanks

Chris

  • 0
    Prodigy 55 points

    Since writing this, I have actually managed to get one GPIO output to work...specifically pin J2.78 [GPIO 85.]  The only pattern I can see at the moment is that the pins I am unable to configure are also muxed with a CLK source (SDICLK/McSPICLK....etc.)  Is there some requirement to disable these UNUSED clock sources as well as setting the correct MUXPAD mode [ie. MODE4 = GPIO] ?