Set GPIOs in OMAP L138 LCDK via Linux sys interface (/sys/class/gpio..)

Alexander Loewer

Prodigy 40 points

Hello,

I am working on setting GPIOs from userspace in linux (via /sys/class/gpio/.. ). Unfortunately it won't work :(

Until now I have:

- chosen the Pins (GPIO2-5)

- added the line into da850.c (mux_config da850_pins; MUX_CFG(DA850, GPIO2_5, 6, 13, 15, 8, false)

- included the registration in board-omapl138-hawk.c under ..hawk_init (ret = davinci_cfg_reg_list(da850_gpio_pins ; with const short da850_gpio_pins[] __initdata = {DA850_GPIO2_4, DA850_GPIO2_5, -1})

Unfortunately it still does not work. Any suggestions?

Thanks,

Alex L.

over 12 years ago

0 Alexander Loewer over 12 years ago

Prodigy 40 points

I should add, that I try using this GPIO via:

echo 37 > /sys/class/gpio/export

echo out > /sys/class/gpio/gpio37/direction

echo 0 > /sys/class/gpio/gpio37/value

but it sticks at 1.

cat /sys/kernel/debug/gpio

shows gpio-37 (sysfs) out hi

Alex L.

0 Joe Z over 11 years ago in reply to Alexander Loewer

Intellectual 640 points

Hi Alex,

First of all, I noted this post have been for a while. Have you figured it out yet?

I face same question how to toggle GPIO2_12 on OMAL138. Do you have some tips for me? Thank you

Joe

Processors

Processors forum

Set GPIOs in OMAP L138 LCDK via Linux sys interface (/sys/class/gpio..)