GPIOs on emCON-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 an GPIO pin, first write the GPIO number to /sys/class/gpio/export

echo 34 [gt] /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 [gt] /sys/class/gpio/gpio34/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 [gt] /sys/class/gpio/gpio34/value
cat /sys/class/gpio/gpio34/value

The list of GPIO numbers can be found below.

 

Avari

There are 8 GPIOs on J27 with a signal level of 3.3V.

 

Connector Pin Signal Signal on MX6 Bank and pin GPIO Number
J27 8 GPIO_1 GPIO_1 2-0 32
J27 10 GPIO_2 GPIO_2 2-1 33
J27 12 GPIO_3 GPIO_3 2-2 34
J27 14 GPIO_4 GPIO_4 2-3 35
J27 16 GPIO_5 GPIO_5 2-4 36
J27 18 GPIO_6 GPIO_6 2-5 37
J27 20 GPIO_7 GPIO_7 2-6 38
J27 22 GPIO_8 GPIO_8 2-7 39

 

Bvari

There are 8 GPIOs on J14 with a signal level of 3.3V.

 

Connector Pin Signal Signal on MX6 Bank and pin GPIO Number
J14 8 GPIO_1 GPIO_1 2-0 32
J14 10 GPIO_2 GPIO_2 2-1 33
J14 12 GPIO_3 GPIO_3 2-2 34
J14 14 GPIO_4 GPIO_4 2-3 35
J14 16 GPIO_5 GPIO_5 2-4 36
J14 18 GPIO_6 GPIO_6 2-5 37
J14 20 GPIO_7 GPIO_7 2-6 38
J14 22 GPIO_8 GPIO_8 2-7 39
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