Difference between revisions of "Fitlet GPIO SDK for Linux"

From fit-PC wiki
Jump to: navigation, search
(fitlet GPIO)   (change visibility)
Line 17: Line 17:
 
|+ GPIO pin naming convention on fitlet
 
|+ GPIO pin naming convention on fitlet
 
|-
 
|-
 +
| Pin number
 +
| Color code
 
| GPIO name
 
| GPIO name
 
| HW source
 
| HW source
| Pin on GPIO Connector
 
 
| Notes
 
| Notes
 
|-
 
|-
 +
| P-1
 +
| Brown
 
| GPIO89
 
| GPIO89
 
| FCH
 
| FCH
| P-1
 
 
|  
 
|  
 
|-
 
|-
 +
| P-2
 +
| Red
 
| GPIO132
 
| GPIO132
 
| FCH
 
| FCH
| P-2
 
 
|  
 
|  
 
|-
 
|-
 +
| P-3
 +
| Orange
 
| GPIO65
 
| GPIO65
 
| FCH
 
| FCH
| P-3
 
 
|  
 
|  
 
|-
 
|-
 +
| P-4
 +
| Yellow
 
| GPIO66
 
| GPIO66
 
| FCH
 
| FCH
| P-4
 
 
|  
 
|  
 
|-
 
|-
 +
| P-5
 +
| Green
 
| GPIO29
 
| GPIO29
 
| FCH
 
| FCH
| P-5
 
 
| Vout 1.5V
 
| Vout 1.5V
 
|-
 
|-
 +
| P-8
 +
| Grey
 
| GPIO73
 
| GPIO73
 
| FCH
 
| FCH
| P-8
 
 
|  
 
|  
 
|-
 
|-
 +
| P-9
 +
| White
 
| GPIO27
 
| GPIO27
 
| FCH
 
| FCH
| P-9
 
 
| Vout 1.5V
 
| Vout 1.5V
 
|-
 
|-
 +
| P-10
 +
| Black
 
| GPIO28
 
| GPIO28
 
| FCH
 
| FCH
| P-10
 
 
| Vout 1.5V
 
| Vout 1.5V
 
|-
 
|-
 +
| P-11
 +
| Brown
 
| GPIO12
 
| GPIO12
 
| FCH
 
| FCH
| P-11
 
 
|  
 
|  
 
|-
 
|-
 
|}
 
|}
 +
  
 
* The GPIO sysfs interface allows users to manipulate any GPIO from userspace dynamically.
 
* The GPIO sysfs interface allows users to manipulate any GPIO from userspace dynamically.
Line 76: Line 87:
 
  $ echo out > /sys/class/gpio/gpio89/direction
 
  $ echo out > /sys/class/gpio/gpio89/direction
 
  $ echo 1 > /sys/class/gpio/gpio89/value
 
  $ echo 1 > /sys/class/gpio/gpio89/value
  ## at this point voltage measuring on P-1 should give 3.3V
+
  ## at this point voltage measuring on P-1 (Brown) should give 3.3V
 
  $ echo 0 > /sys/class/gpio/gpio89/value
 
  $ echo 0 > /sys/class/gpio/gpio89/value
  ## at this point voltage measuring on P-1 should give 0.0V
+
  ## at this point voltage measuring on P-1 (Brown) should give 0.0V
 
  $ echo 89 > /sys/class/gpio/unexport
 
  $ echo 89 > /sys/class/gpio/unexport
  

Revision as of 16:43, 26 October 2015

Installation

  • Open the terminal and install the new linux-*.deb packages:
$ sudo dpkg -i /path/to/linux-*.deb
  • Reboot the system:
$ sudo reboot -f

fitlet GPIO

  • GPIO interface on fitlet consists of 9 I/Os provided by AMD FCH (Fusion Controller Hub)
  • The responsible kernel module is gpio_fch
  • The kernel modules uses the following pin naming convention:


GPIO pin naming convention on fitlet
Pin number Color code GPIO name HW source Notes
P-1 Brown GPIO89 FCH
P-2 Red GPIO132 FCH
P-3 Orange GPIO65 FCH
P-4 Yellow GPIO66 FCH
P-5 Green GPIO29 FCH Vout 1.5V
P-8 Grey GPIO73 FCH
P-9 White GPIO27 FCH Vout 1.5V
P-10 Black GPIO28 FCH Vout 1.5V
P-11 Brown GPIO12 FCH


  • The GPIO sysfs interface allows users to manipulate any GPIO from userspace dynamically.
  • A basic example of GPIO usage (as root user):
$ modprobe fch_gpio
$ 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 89 > /sys/class/gpio/unexport