Table A-1 presents the I/O mappings for Intel Galileo. This table is the official port I/O mapping provided by Intel and also can be found accessing “https://communities.intel.com/docs/DOC-21920”.

Following are acronyms for Table A-1:

• Cypr: Crypress GPIO Expander
• BI: Bidirectional
• I: Input without pull-up off
• Int: Interruption pins
• Dir: Direction

Table A-2 presents the Mux Selectors for Intel Galileo.

Following are acronyms for Table A-2:

• O: Output
• Dir: Direction
• U: Undefined

The following commands demonstrated some examples how to use the table using Linux terminal shell:

• Setting IO7 as GPIO output:

  echo -n "27" > /sys/class/gpio/export
  echo -n "out" > /sys/class/gpio/gpio27/direction
  echo 0 > /sys/class/gpio/gpio27/value # will set OUTPUT as LOW
  echo 1 > /sys/class/gpio/gpio27/value # will set OUTPUT as HIGH

• Setting IO7 as GPIO input:

  echo -n "27" > /sys/class/gpio/export
  echo -n "in" > /sys/class/gpio/gpio27/direction
  cat /sys/class/gpio/gpio27/value