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DESK-MP1-L/Peripherals/GPIOs

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==Peripheral GPIOs ==
Nel In [[ETRA_SOM | ETRA SOM è presente un ]] there is an I2C I/O Expander piloatato via i2c: in this way, non è presente un driver per configurare e usare questi gpio liberamente, questi gpio sono presenti nel pettine ETRA can handle several pins in different ways and most of them can be configured as GPIOs. These GPIOs are available in J11connector.
ETRA can handle external pins in many different ways To configure and most of them can be configured as write/read the GPIOs. When a pin is set as a GPIO, it is possibleyou need to read its value, change its direction or change output value directly from configure the shellI/O expander via I2C commands.
===Accessing the peripheral===
==== Usage with i2c I2C command ====
Set all GPIO on output mode, all pin pins low:
<pre class="workstation-terminal">
</pre>
set Set all pin to high, one by one:
<pre class="workstation-terminal">
</pre>
set Set all pin to high and set all to low one by one: 
<pre class="workstation-terminal">
root@desk-mp1:~# i2cset -y 1 0x34 0x2a 0xff
</pre>
set gpio Set GPIO input mode, disable debounce:
<pre class="workstation-terminal">
</pre>
Read input value:
<pre class="workstation-terminal">
U0007
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