Gpio Test - Advantech ROM-5420 User Manual

Note! Please make sure parameter "seek" is equal to 25118 as indicated in
red in above codes. If you create the file to a wrong sector, that may
damage the system.
3.1.5

GPIO Test

3.1.5.1 ROM-5420 GPIO Default Setting
ROM-DB5900
GPIO0
*GPIO1
GPIO2
*GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
GPIO8
GPIO9
GPIO10
GPIO11
* GPIO1 & GPIO3 has been reserved for camera input in ROM-5420. You can use
the two GPIO ports if you do not need the camera feature.
#cd /sys/class/gpio
You can use "ls" to list all GPIO devices, and you should also see GPIO ports in
above table.
3.1.5.2 Example of Testing GPIO
A. Set gpio177 GPI (in)
#echo in > ./gpio177/direction
#cat ./gpio177/direction
in
B. Set gpio178 GPO (out)
#echo out > ./gpio178/direction
#cat ./gpio178/direction
out
C. Set gpio177 GPO value "0"
#echo 0 > ./gpio177/value
D. Get gpio178 value
ROM-5420 User Manual
Linux OS
/sys/class/gpio
gpio1
-
gpio4
-
gpio205
gpio21
gpio198
gpio199
gpio193
gpio192
gpio178
gpio177
12
Jumper Setting
in ROM-DB5900
CN24(1-2)
CN26(2-3)CAM1_PWR#
CN27(1-2)
CN28(2-3)CAM1_RST#
CN30(1-2)
CN31(1-2)
CN32(1-2)
CN35(1-2)
CN34(1-2)
CN26(1-2)