Am 27.01.2015 um 16:19 schrieb Erry Pradana Darajati:
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 :
- Set GPIO5_OE to 0x1
- 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).
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.
I would suggest as a first step doing this from U-Boot to get familar with the GPIOs. The commands are mw.l for writing and mr.l for reading. If this works then you can continue with your application and L4.
Martin