CODEWITHSUNDEEP
androidlinux-kernelbeagleboard
humpingpanda
humpingpanda

Reputation: 51

Android: how to enable CONFIG_OMAP_MUX beagleboard?

I am using devkit8000 which is similar to beagle board.

How to enable CONFIG_OMAP_MUX inside? Somehow I can't find it via menuconfig. or I am looking at the wrong place?

Upvotes: 0

Views: 378

Answers (1)

tuxGurl
tuxGurl

Reputation: 729

Refer to OMAP35x Technical Reference Manual (Rev. W)

To use GPIO130 you need to make sure the register is in the correct mode for GPIO. You can use devmem2 to peek and poke the registers.

[pg 778] Ensure bit 0 of 0x48002158 is set to 4 = Mode 4 for GPIO

Each GPIO module provides 32 dedicated general-purpose pins with input and output capabilities; thus, the general-purpose interface supports up to 192 (6 x 32) pins. - [pg 3358]

By that computation GPIO 130 should be in GPIO bank 5 bit 2 (plz check math).

(Assuming math is correct) Check GPIO_OE register 0x49056034 bit 2 to ensure the direction is correct. (0=output 1=input)

Now you can set DATA_OUT at 0x4905603C bit 2 or read DATA_IN at 0x49056038 bit 2 as you need.

Once you verify that the GPIO is setup correctly and you are able to peek and poke the values you can use either set it up in your boot-loader or the kernel so it sticks at startup or you can modify it in user space using mmap or /sys/class/gpio/gpio130/.. (if exported) to get/set the values.

Upvotes: 1

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