Intel Edison Board GPIO Control

Intel Edison Board GPIO Control

GPIO

모든 핀을 세팅하기 전에 pin 214 LOW 해주고 나중에 HIGH 해야함

살펴보기

root@edison_kjc:~# ls /sys/class/gpio

export       gpio182      gpio215      gpio233      gpio255      gpio45

gpio12       gpio183      gpio216      gpio234      gpio256      gpio46

gpio124      gpio200      gpio217      gpio235      gpio257      gpio47

gpio125      gpio201      gpio218      gpio236      gpio258      gpio48

gpio126      gpio202      gpio219      gpio237      gpio259      gpio49

gpio127      gpio203      gpio220      gpio240      gpio260      gpiochip0

gpio128      gpio204      gpio221      gpio241      gpio261      gpiochip200

gpio129      gpio205      gpio222      gpio242      gpio262      gpiochip216

gpio13       gpio207      gpio223      gpio243      gpio263      gpiochip232

gpio130      gpio208      gpio224      gpio248      gpio27       gpiochip248

gpio131      gpio209      gpio225      gpio249      gpio28       unexport

gpio132      gpio210      gpio226      gpio250      gpio40

gpio133      gpio211      gpio227      gpio251      gpio41

gpio134      gpio212      gpio228      gpio252      gpio42

gpio14       gpio213      gpio229      gpio253      gpio43

gpio165      gpio214      gpio232      gpio254      gpio44

root@edison_kjc:~#

IO 0 ~13 Digital PIN이며 digital 13핀은 40번으로 리눅스가 알아들음

root@edison_kjc:~# ls -l /sys/class/gpio/gpio40/

-rw-r--r--    1 root     root          4096 Mar  7 06:55 active_low

lrwxrwxrwx    1 root     root             0 Mar  7 06:55 device -> ../../../0000:00:0c.0

-rw-r--r--    1 root     root          4096 Mar  7 06:17 direction

-rw-r--r--    1 root     root          4096 Mar  7 06:55 edge

drwxr-xr-x    2 root     root             0 Mar  7 06:55 power

lrwxrwxrwx    1 root     root             0 Mar  7 06:55 subsystem -> ../../../../../class/gpio

-rw-r--r--    1 root     root          4096 Mar  7 06:17 uevent

-rw-r--r--    1 root     root          4096 Mar  7 06:17 value

root@edison_kjc:~# echo out > /sys/class/gpio/gpio40/direction

-> gpio 40을 out으로 설정

root@edison_kjc:~# echo 1 > /sys/class/gpio/gpio40/value

-> gpio 40에 HIGH(1) 설정

그러나 13핀에 연결된 LED 켜지지는 않음

40번을 포트 설정

root@edison_kjc:~# echo 40 > /sys/class/gpio/unexport

root@edison_kjc:~# echo 40 > /sys/class/gpio/export

root@edison_kjc:~#

261번을 포트설정

root@edison_kjc:~# echo 261 > /sys/class/gpio/unexport

root@edison_kjc:~# echo 261 > /sys/class/gpio/export

214에 LOW값 세팅

root@edison_kjc:~# echo low > /sys/class//gpio/gpio214/direction

261번을 high 해야 한다.

root@edison_kjc:~# echo high > /sys/class//gpio/gpio261/direction

SoC pin mode 변경해야함 0으로

root@edison_kjc:~# echo mode0 > /sys/kernel/debug/gpio_debug/gpio40/current_pinmux

root@edison_kjc:~# echo out > /sys/class/gpio/gpio40/direction

40번을 high로 세팅

root@edison_kjc:~# echo 1 > /sys/class/gpio/gpio40/value

214에 HIGH 값 세팅

root@edison_kjc:~# echo high > /sys/class/gpio/gpio214/direction

처리할 것이 없는 7번으로 다시 설정해본다

IO7 -> 48(Linux GPIO pin)

root@edison_kjc:~# ls /sys/class/gpio/gpio48/

active_low  device      direction   edge        power       subsystem   uevent      value

root@edison_kjc:~# echo 48 > /sys/class/gpio/export   

 -> 48포트를 사용할 것이다.

-sh: echo: write error: Device or resource busy

root@edison_kjc:~# echo 48 > /sys/class/gpio/unexport

-> 48포트를 해제.

root@edison_kjc:~# ls /sys/class/gpio/

export       gpio133      gpio207      gpio219      gpio233      gpio251      gpio263      gpiochip0

gpio12       gpio134      gpio208      gpio220      gpio234      gpio252      gpio27       gpiochip200

gpio124      gpio14       gpio209      gpio221      gpio235      gpio253      gpio28       gpiochip216

gpio125      gpio165      gpio210      gpio222      gpio236      gpio254      gpio40       gpiochip232

gpio126      gpio182      gpio211      gpio223      gpio237      gpio255      gpio41       gpiochip248

gpio127      gpio183      gpio212      gpio224      gpio240      gpio256      gpio42       unexport

gpio128      gpio200      gpio213      gpio225      gpio241      gpio257      gpio43

gpio129      gpio201      gpio214      gpio226      gpio242      gpio258      gpio44

gpio13       gpio202      gpio215      gpio227      gpio243      gpio259      gpio45

gpio130      gpio203      gpio216      gpio228      gpio248      gpio260      gpio46

gpio131      gpio204      gpio217      gpio229      gpio249      gpio261      gpio47

gpio132      gpio205      gpio218      gpio232      gpio250      gpio262      gpio49

48 포트가 사라짐

root@edison_kjc:~# echo 48 > /sys/class/gpio/export  다시 실행

root@edison_kjc:~# echo out > /sys/class/gpio/gpio48/direction

root@edison_kjc:~# echo 1 > /sys/class/gpio/gpio48/value

LED를 키기 위해 output enable 255를 설정해야 함

root@edison_kjc:~# echo 1 > /sys/class/gpio/gpio255/value

-> LED 불이 들어온다.

root@edison_kjc:~# echo 0 > /sys/class/gpio/gpio255/value

-> LED 불이 꺼진다.