本文基于RockPi 4A Debian系统介绍i2c设备的调试工具i2c-tools。i2c-tools的相关命令常用于linux系统读写i2c设备寄存器的在线调试。
安装命令：
apt-get updateapt-get install i2c-tools
linux版本代码下载路径：
https://mirrors.edge.kernel.org/pub/software/utils/i2c-tools/
一、i2cdetect
1、命令
root@linaro-alip:/# i2cdetect
Error: No i2c-bus specified!
Usage: i2cdetect [-y] [-a] [-q|-r] I2CBUS [FIRST LAST]
i2cdetect -F I2CBUS
i2cdetect -l
I2CBUS is an integer or an I2C bus name
If provided, FIRST and LAST limit the probing range.
2、用法
## 列出i2c总线
root@linaro-alip:/# i2cdetect -l
i2c-0 i2c rk3x-i2c
I2C adapter
i2c-1 i2c rk3x-i2c
I2C adapter
i2c-9 i2c DesignWare
HDMI I2C
adapter
## 列出某个i2c总线上的i2c设备
root@linaro-alip:/# i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: UU UU -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
二、i2cdump
1、命令
root@linaro-alip:~# i2cdump
Error: No i2c-bus specified!
Usage: i2cdump [-f] [-y] [-r first-last]
I2CBUS ADDRESS [MODE [BANK [BANKREG]]] I2CBUS is an integer or an I2C bus name
ADDRESS is an integer (0x03 - 0x77)
MODE is one of:
b (byte, default)
w (word)
W (word on even register addresses)
s (SMBus block)
i (I2C block)
c (consecutive byte)
Append p for SMBus PEC
2、用法
## 显示I2C 0号总线上0x1b设备的寄存器值。
MODE为byte，可省略。
root@linaro-alip:~# i2cdump -f -y 0 0x1b b
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 12 50 08 21 01 13 01 00 00 00 00 01 01 00 00 00 ?P?!???....??...
10: 80 02 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ??..............
20: 01 17 00 6f ff 00 00 00 10 00 ff 0f ff 02 19 0f ??.o....?..?.???
30: 00 00 19 07 00 00 02 03 00 00 09 00 00 00 00 0a ..??..??..?....?
40: 00 0c 00 0c 00 07 00 01 00 0c 00 00 00 5f 00 03 .?.?.?.?.?..._.?
50: 06 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ??..............
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
70: 00 cf 03 00 28 00 0c 1c 80 19 00 34 12 00 71 00 .??.(.????.4?.q.
80: 10 50 1f ac 00 40 10 01 40 00 08 00 09 09 00 00 ?P??.@??@.?.??..
90: 55 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 U...............
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
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