How to access gpio pin in Mistral Dm3730evm

elavarasu thangavel

Hi,

I am novice to kernel-hardware interaction coding. This could be a very basic question but i need help since i could not proceed further in hardware development. I am trying to access the gpio pins from kernel with psp 3.0.1.6 linux 2.6.32. I could make control come to the kernel level with help of ioctl(). From kernel, I could not access the physical pins. When searched in the forum and as well as in the source code, I could not get any clues. I tried pinmux, raw_write and io_remap, physical_to_virtual mapping. I think I am missing some basic information.

Could someone please guide with how to proceed.

Thanks in advance. -- Elavarasu.

over 13 years ago

0 Vaibhav Hiremath over 13 years ago

TI__Expert 8180 points

You can access GPIO's through standard Linux GPIO API's. Please refer to the Linux documentation - http://www.mjmwired.net/kernel/Documentation/gpio.txt

Note: Please note that you have to set right pin mux configuration to use any pin in GPIO mode. You can use API "omap_mux_init_gpio" for this purpose.

Thanks,

Vaibhav

0 elavarasu thangavel over 13 years ago in reply to Vaibhav Hiremath

Prodigy 100 points

Thanks sir for reply...

But i am using the GCC for the compling (arm-none-linux-gcc).

When start to complie it there is error comes --directory is not found..

Could you help me how to include the omap_mux_init_gpio..

0 Vaibhav Hiremath over 13 years ago in reply to elavarasu thangavel

TI__Expert 8180 points

Can you paste the exact error you are getting?

Thanks,

Vaibhav

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How to access gpio pin in Mistral Dm3730evm