how to control GPIO in Android application?

zamster

Hi,
I want to create android application that is able to control GPIO, LED, Serial port.
I've searched a lot but can't get enough good answer.

I know it uses JNI interface in android app, but do now know in driver side.

would you give me effective example?

thanks
Jay

busybee

Please reference:
- http://falsinsoft.blogspot.jp/20 ... nux-user-space.html
- http://android.serverbox.ch/?p=972

Make sure your program has access permission to the files.

zamster

thanks for your reply.

would you give me more explanation?
how can I access UART serial by using TX, RX, GRD?
I need a specific guide or code..

busybee

zamster Posted at 9/9/2015 10:09
thanks for your reply.

would you give me more explanation?

First refer to the uart driver wiki:
http://wiki.t-firefly.com/index.php/Firefly-RK3288/UART/en

If you are using uart3, you can access /dev/ttyS3.
Then google for "Linux serial programming", which will give you a bunch of
documents and examples. One is:

http://www.comptechdoc.org/os/li ... inux_pgcserial.html

zamster

busybee Posted at 9/11/2015 10:33
First refer to the uart driver wiki:
http://wiki.t-firefly.com/index.php/Firefly-RK3288/UART/en
...

thanks.

one more question.
Do I have to make new uart driver for uart communications?
(if I'm using uart3 I can just access /dev/ttyS3 without making new uart driver..)

busybee

Same uart driver is already configured builtin for all the uart devices.  
No need to make new one.

zamster

in the middle of page (http://wiki.t-firefly.com/index.php/Firefly-RK3288/UART/en),
what is meaning of "Turn on CONFIG_SERIAL_ROCKCHIP in kernel configuration"?

Compile and Flash KernelTurn on CONFIG_SERIAL_ROCKCHIP in kernel configuration, which will add corresponding drivers/tty/serial/rk_serial.c to kernel. Then compile the kernel as followed:
make firefly-rk3288.img

busybee

Add:
  CONFIG_SERIAL_ROCKCHIP=y
in your kernel/.config file