1.下载 i2c-tools-3.0.2.tar.bz2
2. 解压后，修改Makefile文件，选择arm的编译器，同时在tools的Module.mk文件中编译选项中添加-static静态编译选项，
不然生成的执行文件会提示无法找到的提示；静态-static 添加在-o的前面就行了。
3.一切顺利生成i2cdetect,i2cdump,i2cset,i2cget等命令工具；
4.adb push i2cdetect /system/bin
adb push i2cdump /system/bin
adb push i2cset /system/bin
adb push i2cget /system/bin
-----------------------下面是关于这四个命令的用法举例
i2c-tools中含有四個執行檔
- i2cdetect – 用來列舉I2C bus和上面所有的裝置
- i2cdump – 顯示裝置上所有register的值
- i2cget – 讀取裝置上某個register的值
- i2cset – 寫入裝置上某個register
以下是我用beagleboard得到的結果
i2c-0 i2c s3c2410-i2c I2C adapter
i2c-1 i2c s3c2410-i2c I2C adapter
i2c-2 i2c s3c2410-i2c I2C adapter
/system/bin #
看到有三条I2C总线
/system/bin # i2cdetect -y -r 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- 34 -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
/system/bin #
查看总线0上面有哪些设备以及设备地址；
/system/bin # i2cdump -f -y 0 0x34
No size specified (using byte-data access)
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 38 70 00 21 00 00 00 00 00 00 00 00 00 00 00 00 8p.!............
10: 05 00 5f 00 00 00 00 00 00 00 00 00 00 00 00 00 ?._.............
20: 00 00 00 16 00 00 00 68 ff 68 00 00 00 00 00 00 ...?...h.h......
30: 61 02 42 c9 45 22 9d 08 a5 1f 68 5f fc 16 00 00 a?B?E"????h_??..
40: d8 ff 03 01 00 00 00 00 08 08 02 00 60 00 00 00 ?.??....???.`...
50: cf 0e 00 00 0e 1f 00 00 00 00 00 00 00 00 71 04 ??..??........q?
60: a2 05 00 08 00 00 00 00 00 00 00 00 00 00 00 00 ??.?............
70: 0c 27 a1 00 00 00 00 00 d0 02 00 00 0f 17 a2 00 ?'?.....??..???.
80: e0 fd 83 80 32 00 ff 00 00 00 00 00 00 00 00 21 ????2..........!
90: 07 a5 07 07 00 02 00 00 00 00 00 00 00 00 00 00 ????.?..........
a0: 00 00 00 00 00 01 1d 01 cd 06 00 00 0e 12 a2 0b .....?????..????
b0: 00 00 00 00 00 00 00 00 00 14 80 ba d2 0d 00 00 .........?????..
c0: 01 01 02 04 07 0d 10 1a 24 2e 35 3d 49 54 5c 63 ????????$.5=IT\c
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
f0: 41 00 80 03 00 00 00 00 00 00 00 00 00 00 00 00 A.??............
/system/bin #
读设备0x34的寄存器内容
/system/bin # i2cget -f -y 0 0x34 0x28
0xff
/system/bin #
单独读0x28寄存器的值
/system/bin #
/system/bin #
/system/bin # i2cset -f -y 0 0x34 0x28 0xfb
/system/bin #
单独写0x28寄存器的值
/system/bin # i2cget -f -y 0 0x34 0x28
0xfb
/system/bin #
可以看出寄存器值已经由0xff改成为0xfb