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==Peripheral GPIOs ==
In [[ETRA_SOM | ETRA SOM]] there is an I2C I/O Expander driven via i2c: in this way, with this ETRA can handle external several pins in many different ways and most of them can be configured as GPIOs, these . These GPIOs are present available in the J11 connector.
=== Accessing the peripheral ===
==== Usage with i2c I2C command ====
Set all GPIO on output mode, all pin pins low:
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root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xff
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Read input value:
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