GPIOs on DIMM-MX6 under Linux

Please see the following table for the translation from baseboard pin to CPU pin:

Under Linux you can use sysfs to access gpios.

To get access to a GPIO pin, first, write the GPIO number to /sys/class/gpio/export

echo 40 > /sys/class/gpio/export

Now you should find a directory in /sys/class/gpio to access your GPIO pin. Write in or out to direction to change the direction of the pin:

echo out > /sys/class/gpio/gpio40/direction

The value (0 for off, 1 for on) of the pin is in the value file. To read or change it, read the file or write to it.

echo 1 > /sys/class/gpio/gpio40/valuecat /sys/class/gpio/gpio40/value

The list of GPIO numbers can be found below.

Verno 3/Verno 4/Cadun

There are 8 GPIOs on J12 with a signal level of 3.3V and 14 more on J16 via an GPIO expander.

Connector	Pin	Signal	Signal on MX6	Bank and pin	GPIO Number
J12	4	GPIO_0	GPIO_0	2-0	32
J12	6	GPIO_1	GPIO_1	2-1	33
J12	8	GPIO_2	GPIO_2	2-2	34
J12	10	GPIO_3	GPIO_3	2-3	35
J12	12	GPIO_4	GPIO_4	1-9	9
J12	14	GPIO_5	GPIO_5	2-9	41
J12	16	GPIO_6	GPIO_6	2-10	42
J12	18	GPIO_7	GPO_7	2-27	59

Tarion

There are 2 GPIOs on J12 with a signal level of 3.3V and 14 more on J16 via an GPIO expander. The signal GPO_7 of DIMM-MX6 can only be used as output and not as input.

Connector	Pin	Signal	Signal on MX6	Bank and pin	GPIO Number
J12	4	GPIO_0	GPIO_0	2-0	32
J12	6	GPIO_1	GPIO_1	2-1	33

Lothron 3

The Lothron 3 has 8 accessible GPIO pins on J25.

Connector	Pin	Signal	Signal on MX6	Bank and pin	GPIO Number
J25	11	GPIO_0	GPIO_0	2-0	32
J25	12	GPIO_1	GPIO_1	2-1	33
J25	13	GPIO_2	GPIO_2	2-2	34
J25	14	GPIO_3	GPIO_3	2-3	35
J25	15	GPIO_4	GPIO_4	1-9	9
J25	16	GPIO_5	GPIO_5	2-9	41
J25	17	GPIO_6	GPIO_6	2-10	42
J25	18	GPIO_7	GPO_7	2-27	59

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