[Out-Of-Topic]How to Access Input GPIO of OMAP4460 without L4Re (direct access)

Matthias Lange matthias.lange at kernkonzept.com
Wed Jan 28 09:58:31 CET 2015


On 01/27/2015 04:19 PM, Erry Pradana Darajati wrote:
> Hi L4 Hackers,
> My subject seems out of topic, but i don't know where i can ask this
> kind of thing, and i think there are many people have a knowledge about
> this subject.
> I have a problem. I want to directly access GPIO140 (in GPIO5 ball) as
> input.
> I have a function to print the value of GPIO5_DATAIN (0x4805 B138). But
> when i print that out, the value of it still not changed (zero value). I
> Conclude, the pin still not accepting the input. I have already done
> these things :
> 1. Set GPIO5_OE to 0x1
> 2. See the value of MCSPI1_CS3 Pad Configuration (0x4A10 013C) and it
> give me value like this (0x011B 001B) which is for GPIO_140 ->
> MUX_MODE=gpio_140. PULLUDENABLE=0x1(enable). PULLTYPESELECT=0x1(enable).

This looks ok.

Do you have your input already connected to the pin? How does your input

Maybe I can try your setup later today (no promise).


> Which is in my current knowledge, is a right setting for accepting
> input. But still, it's still not successful
> So where or what did i miss ? is it still any configuration / address to
> set ?
> I appologize for the Out-of-Topic Subject .Thank you for any answer and
> suggestion and help.
> -- 
> /Regards,/
> /Erry Pradana Darajati | *Student of Computer Engineering*/
> /*Politeknik Elektronika Negeri Surabaya / EEPIS, Indonesia*/
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Matthias Lange, matthias.lange at kernkonzept.com, +49 - 351 - 41 88 86 14

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