Android from hardware to application: Step by Step 2--run C program test hardware Driver

Write a C program to quickly test the hardware driver:

Create the Driver_test folder in the external folder under the Android source root directory:

CD External

mkdir driver_test

CD Driver_test

Create Android.mk:

Local_path: = $ (call My-dir) include $ (clear_vars) Local_module_tags: = Optionallocal_module: = driver_testlocal_src_ FILES: = Driver_test.cinclude $ (build_executable)

Create driver_test.c:

#include <stdio.h>  #include <stdlib.h>  #include <fcntl.h>        int main (int argc, char *argv [])  {      int  fd;      int  val=0;        Fd=open ("/dev/adrio", O_RDWR);            if (fd<0)      {          printf ("Open device failed!\n");          Exit (1);      }      else      {          printf ("Open success! \ n ");      }              Write (fd,argv[1],1);                Close (FD);      return 0;  }  

Back to Android source root: Make Driver_test

You may initially be prompted with an error:

Host C + +: Libhost <= build/libs/host/pseudolocalize.cpp/bin/bash:g++: Command not found

Make: ***[OUT/HOST/LINUX-X86/OBJ/STATIC_LIBRARIES/LIBHOST_INTERMEDIATES/PSEUDOLOCALIZE.O] Error 127

Solve:

Sudo-i
Aptitude Install g++

sudo apt-get install build-essential

After the installation is complete, do the following: Make Driver_test

Final compilation Complete:

Install:out/target/product/generic/system/lib/libm.soinstall:out/target/product/generic/system/bin/driver_test

Copy the out/target/product/generic/system/bin/driver_test to the am335x file system and start Android

Run:

./driver_test 1 (then D1)

./driver_test 0 (then D1)

Tested successfully, this method can be used to quickly test the Linux kernel driver under Android

Android from hardware to application: Step by Step 2--run C program test hardware Driver