【海思开源篇】-（3）i2c-tools
1 源码下载
https://mirrors.edge.kernel.org/pub/software/utils/i2c-tools/
下载版本为i2c-tools-4.1.tar.gz
根文件系统中已经通过busybox生成了i2c-tools，赞！！！
2 编译
make clean;make CC=arm-himix400-linux-gcc
拷贝i2cdetect i2cdump i2cget i2cset i2ctransfer
3 工具使用
3.1 i2cdetect
~ # i2cdetect -l
i2c-1 i2c hibvt-i2c I2C adapter
i2c-0 i2c hibvt-i2c I2C adapter
/home # i2cdetect
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.
Usage: i2cdetect -l | -F I2CBUS | [-ya] [-q|-r] I2CBUS [FIRST LAST]
Detect I2C chips
-l List installed buses
-F BUS# List functionalities on this bus
-y Disable interactive mode
-a Force scanning of non-regular addresses
-q Use smbus quick write commands for probing (default)
-r Use smbus read byte commands for probing
FIRST and LAST limit probing range
~ # i2cdetect -r -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: — — — — — — — — — — — — —
10: — — — — — — — — — — — — — — — —
20: — — — — — — — — — — — — — — — —
30: 30 31 — — — — — — — — — — — — — —
40: — — — — — — — — — — — — — — — —
50: — — — — — — — — — — — — — — — —
60: — — — — — — — — — — — — — — — —
70: — — — — — — — —
i2c0上挂载两颗，由此推出i2c 地址分别为0x60,0x62（左移一位）
/home # i2cdetect -r -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: — — — — — — — — — — — — —
10: — — — — — — — — — — — — — — — —
20: — — — — — — — — — — — — — — — —
30: — — — — — — — — — — — — — — — —
40: — — — — — — — — — — — — — — — —
50: — — — — — — — — — — — — — — — —
60: — — — — — — — — 68 — — — — — — —
70: — — — — — — — —
从而可知i2c1上挂载有三个设备0x683.2 i2cdump
/home # i2cdump
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.
Usage: i2cdump [-fy] [-r FIRST-LAST] BUS ADDR [MODE]
Examine I2C registers
I2CBUS I2C bus number
ADDRESS 0x03-0x77
MODE is:
b Byte (default)
w Word
W Word on even register addresses
i I2C block
s SMBus block
c Consecutive byte
Append p for SMBus PEC
-f Force access
-y Disable interactive mode
-r Limit the number of registers being accessed
/home # i2cdump -f -y 1 0x68
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: d1 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ?!…………..
10: 00 00 00 00 00 00 00 00 5f f8 dc 10 00 00 00 00 …….._???….
20: 00 80 00 00 80 00 00 00 00 00 00 00 00 00 00 00 .?..?………..
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …………….
40: 28 03 28 00 0b 88 80 10 00 00 00 20 80 42 4c 00 (?(.????… ?BL.
50: 00 00 00 00 00 00 00 00 00 00 07 30 81 0b c0 00 ……….?0???.
60: 14 14 24 04 0a 18 48 08 11 00 00 00 00 00 00 00 ??$???H??…….
70: 00 00 00 00 4c a1 14 00 00 00 15 03 00 00 00 00 ….L??…??….
80: d1 21 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ?!…………..
90: 00 00 00 00 00 00 00 00 8d 02 dd 10 00 00 00 00 ……..????….
a0: 00 80 00 00 80 00 00 00 00 00 00 00 00 00 00 00 .?..?………..
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …………….
c0: 28 03 28 00 0b 88 80 10 00 00 00 20 80 42 4c 00 (?(.????… ?BL.
d0: 00 00 00 00 00 00 00 00 00 00 07 30 81 0b c0 00 ……….?0???.
e0: 14 14 24 04 0a 18 48 08 11 00 00 00 00 00 00 00 ??$???H??…….
f0: 00 00 00 00 4c a1 14 00 00 00 15 03 00 00 00 00 ….L??…??….
3.3 i2cset
/home # i2cset
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.
Usage: i2cset [-fy] [-m MASK] BUS CHIP-ADDRESS DATA-ADDRESS [VALUE] … [MODE]
Set I2C registers
I2CBUS I2C bus number
ADDRESS 0x03-0x77
MODE is:
c Byte, no value
b Byte data (default)
w Word data
i I2C block data
s SMBus block data
Append p for SMBus PEC
-f Force access
-y Disable interactive mode
-r Read back and compare the result
-m MASK Mask specifying which bits to write
/home # i2cset -f -y 1 0x68 0x7a 0x15
3.4 i2cget
/home # i2cget
BusyBox v1.30.1 (2020-05-28 08:57:22 CST) multi-call binary.
Usage: i2cget [-fy] BUS CHIP-ADDRESS [DATA-ADDRESS [MODE]]
Read from I2C/SMBus chip registers
I2CBUS I2C bus number
ADDRESS 0x03-0x77
MODE is:
b Read byte data (default)
w Read word data
c Write byte/read byte
Append p for SMBus PEC
-f Force access
-y Disable interactive mo
/home # i2cget -f -y 1 0x68 0xfa
0x15
