ok6410 android driver(5)

　　Test the android driver by JNI (Java Native Interface),

　　In the third article, we know how to compiler the moduler for localhost, ok6410 and goldfish platform.

http://www.cnblogs.com/plinx/p/3209500.html

　　But we didn't try to test the driver using by C/C++ program on ok6410 and goldfish.

　　Android was changing from linux, so there must remain some fetures linux working.

　　If we want to test a driver using C/C++ program, we should get ready for the following conditions :

　　(1) Goldfish emulator/Ok6410/Phone must got the permission to "root".

　　(2) The exec file compiled by the cross compiler.

　　It's easy to go on within these limits, we just need to compile the C/C++ program in the android source configured by "Android.mk".

　　Here is the Android.mk :

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)# files to compilerLOCAL_SRC_FILES := ftest.c# obj name - the output execute file nameLOCAL_MODULE := ftestLOCAL_MODULE_TAGS := optionalinclude $(BUILD_EXECUTABLE)

　　And the ftest.c is :

#include <stdio.h>#include <fcntl.h>#include <unistd.h>#include <stdlib.h>#include <string.h>int main(int argc, char *argv[]){    int testdev;    int ret;    int num = 0;    unsigned char buf[4];    testdev = open("/dev/wordcount2", O_RDWR);    if(testdev == -1) {        printf("Can not open file.\n");        return 0;    }    if(argc > 1) {        printf("Strings : %s.\n", argv[1]);        write(testdev, argv[1], strlen(argv[1]));    }    read(testdev, buf, 4);    num =     ((int)buf[0]) << 24 | \        ((int)buf[1]) << 16 | \        ((int)buf[2]) << 8  | \        ((int)buf[3]);    printf("Word Byte : 0x%d%d%d%dH\n", buf[0], buf[1], buf[2], buf[3]);    printf("word count: %d\n", num);    close(testdev);    return 0;}

　　now, we should mkdir in the source code :

$ pwd~/Android/source_code/development/ndk/wordcount$ lsAndroid.mk  ftest.c

　　then return to the root directory :

$ cd ~/Android/source_code/$ source build/envsetup.sh$ mmm development/ndk/wordcount...Install: out/target/product/generic/system/bin/ftest...

　　Then we just need to push the file to emulator and test it.

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