- This application notes applies to fitlet1 models running Linux environment.
- It provides instructions to install the dkms kernel module to enable GPIO functionality.
Installation
- Download and install the package:
$ wget https://fit-iot.com/files/download/fitlet/sw/gpio-fch-dkms_1.01.deb
$ sudo dpkg -i gpio-fch-dkms_1.01.deb
$ modinfo gpio-fch
filename: /lib/modules/4.15.0-20-generic/extra/gpio-fch.ko
license: GPL
description: GPIO interface for AMD Mullins FCH (Fusion Controller Hub)
author: Denis Turischev <denis.turischev@compulab.co.il>
srcversion: 606B1C81CF1D962BE0B5C92
alias: pci:v00001022d0000780Esv*sd*bc*sc*i*
depends:
retpoline: Y
name: gpio_fch
vermagic: 4.15.0-20-generic SMP mod_unload
GPIO connector Pinout
Pin Number
|
Color Code
|
GPIO name
|
Power domain
|
HW source
|
Notes
|
1
|
Brown
|
GPIO89
|
3.3V
|
SoC
|
|
2
|
Red
|
GPIO132
|
3.3V
|
SoC
|
|
3
|
Orange
|
GPIO65
|
3.3V
|
SoC
|
|
4
|
Yellow
|
GPIO66
|
3.3V
|
SoC
|
|
5
|
Green
|
GPIO29
|
1.5V
|
SoC
|
|
6
|
Blue
|
I2C Clock
|
3.3V
|
SoC
|
|
7
|
Purple
|
I2C Data
|
3.3V
|
SoC
|
|
8
|
Grey
|
GPIO73
|
3.3V
|
SoC
|
|
9
|
White
|
GPIO27
|
1.5V
|
SoC
|
|
10
|
Black
|
GPIO28
|
1.5V
|
SoC
|
|
11
|
Brown
|
GPIO12
|
3.3V
|
SoC
|
|
12
|
Red
|
UART Rx
|
3.3V
|
SuperIO
|
|
13
|
Orange
|
UART Tx
|
3.3V
|
SuperIO
|
|
14
|
Yellow
|
|
|
GND
|
|
Usage example
$ sudo -i
$ modprobe gpio_fch
$ echo 89 > /sys/class/gpio/export
$ echo out > /sys/class/gpio/gpio89/direction
$ echo 1 > /sys/class/gpio/gpio89/value
## at this point voltage measuring on P-1 (Brown) should give 3.3V
$ echo 0 > /sys/class/gpio/gpio89/value
## at this point voltage measuring on P-1 (Brown) should give 0.0V
$ echo in > /sys/class/gpio/gpio89/direction
$ cat /sys/class/gpio/gpio89/value
## at this point cat command will print 0 or 1 depending if voltage measuring on P-1 (Brown) was 0V or 3.3V
$ echo 89 > /sys/class/gpio/unexport