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 of good solution.
The following is the programming path which I understand.

Android App (Java) ---> Android JNI ---> Android Native Code (C/C++) ---> ??? ---> Device Drivers

. How can I access the Device Drivers (GPIO, LED, Serial port) in Android Native C/C++ code?

. Do I need to modify or create existing device driver for using GPIO, LED, Serial port?

. Is there library provided to read/write specific resource like "/sys/class/gpio/gpio91/value"?

. Would you let me know how to access GPIO, LED, Serial port in Android App with sample source code or SDK?


Thanks.

zamster

thanks.

in your sample, how can I build luobogpio.c (driver) file and put luobogpio.o (maybe..) file into dev/luobogpio?

zamster

I want to know how to build custom driver file. (not to build android sdk)
meaning of build custom driver file indicates that adding a new file (luobogpio.c into where?), modifying Makefile, creating object file, and so on.

still don't get it enough...