GPIOs on DIMM-AM335 under Linux

Enabling GPIO control

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

echo 7 [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/gpio7/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/gpio7/value
cat /sys/class/gpio/gpio7/value

The list of GPIO numbers can be found below.

 

CPU Module

 

The two color led can be controlled by two GPIO pins.

 

Color Bank and pin GPIO Number Notes
Green 2-4 68 output is inverted, 0 is on
Red 2-5 69  

 

Verno 3/4/Cadun

 

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

 

Connector Pin Signal Bank and pin GPIO Number
J12 4 GPIO_0 0-7 7
J12 8 GPIO_2 1-21 53
J12 12 GPIO_4 2-19 83
J12 14 GPIO_5 3-9 105
J12 16 GPIO_6 2-18 82
J12 18 GPIO_7 3-10 106
J12 20 GPIO_8 0-13 13
J12 22 GPIO_9 0-12 12
J16 3 GPIO_I2C_0   128
J16 4 GPIO_I2C_8   136
J16 5 GPIO_I2C_1   129
J16 6 GPIO_I2C_9   137
J16 7 GPIO_I2C_2   130
J16 8 GPIO_I2C_10   138
J16 9 GPIO_I2C_3   131
J16 10 GPIO_I2C_11   139
J16 11 GPIO_I2C_4   132
J16 12 GPIO_I2C_12   140
J16 13 GPIO_I2C_5   133
J16 14 GPIO_I2C_13   141
J16 15 GPIO_I2C_6   134
J16 17 GPIO_I2C_7   135

 

Lothron 3

 

The Lothron 3 has 8 accessible GPIO pins on J25.

 

Connector Pin Signal Bank and pin GPIO Number
J25 11 GPIO_0 0-7 7
J25 13 GPIO_2 1-21 53
J25 15 GPIO_4 2-19 83
J25 16 GPIO_5 3-9 105
J25 17 GPIO_6 2-18 82
J25 18 GPIO_7 3-10 106
J25 19 GPIO_8 0-13 13
J25 20 GPIO_9 0-12 12
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