i2c erproom 读取 ——i2cdetect i2cdump i2cget i2cset 使用方法
i2cdetect i2cdump i2cget i2cset 使用方法
1. 打印使用说明 i2cdetect –help
rk3568_r:/ # i2cdetect --help usage: i2cdetect [-ary] BUS [FIRST LAST] usage: i2cdetect -F BUS usage: i2cdetect -l Detect i2c devices. -a All addresses (0x00-0x7f rather than 0x03-0x77) -F Show functionality -l List all buses -r Probe with SMBus Read Byte -y Answer "yes" to confirmation prompts (for script use)
2. 列出所有的i2c设备节点 i2cdetect -l
rk3568_r:/ # i2cdetect -l i2c-1 i2c rk3x-i2c I2C Adapter i2c-6 i2c DP-AUX I2C Adapter i2c-4 i2c rk3x-i2c I2C Adapter i2c-0 i2c rk3x-i2c I2C Adapter i2c-7 i2c DesignWare HDMI I2C Adapter i2c-5 i2c rk3x-i2c I2C Adapter
3、查看i2c设备挂载的设备 i2cdetect -y 设备号
rk3568_r:/ # i2cdetect -y 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: 10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
4. 打印i2cdump 使用说明
rk3568_r:/ # i2cdump --help usage: i2cdump [-fy] BUS CHIP Dump i2c registers. -f Force access to busy devices -y Answer "yes" to confirmation prompts (for script use)
5. 查看指定设备地址的所有寄存器值
rk3568_r:/ # i2cdump -f -y 0 0x20
0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef
00: 00 00 00 00 00 00 00 00 00 00 01 01 00 81 00 00 ..........??.?..
10: 00 00 03 00 00 00 00 06 c8 00 00 00 00 00 00 00 ..?....??.......
20: 00 00 00 ff ff 00 00 70 00 66 00 00 00 00 00 0f ...??..p.f.....?
30: 04 00 00 00 a5 00 00 00 20 ff ff 00 00 e0 0f 09 ?...?... ??..???
40: 69 4c 04 58 2d 0c a5 00 00 00 00 17 00 00 17 00 iL?X-??....?..?.
50: 8c 00 01 00 01 b0 44 10 00 60 00 00 00 00 00 00 ?.?.??D?.`......
60: 00 00 00 00 00 00 00 00 00 00 00 00 01 00 2f 00 ............?./.
70: 00 00 00 00 ff ff f8 5f 00 01 ff fd 00 00 00 00 ....???_.???....
80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
90: 60 80 2d 7f dd df ad 80 2d 00 00 00 00 00 00 00 `?-?????-.......
a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
b0: 00 0f 0f 0f 0f 04 a4 ff ff 00 64 20 20 64 1a 20 .????????.d d?
c0: 64 00 00 64 1a 20 64 ff ff ff ff ff 0c 0c 0c 0c d..d? d?????????
d0: 0c 0c 6c 6c 30 6c 6c 6c 30 30 30 30 30 30 09 31 ??ll0lll000000?1
e0: 00 00 00 55 a2 c8 c5 40 00 ff 22 03 0a 80 94 0e ...U???@.?"?????
f0: c2 ac a0 40 18 10 00 86 00 fc 00 ff 00 ff 60 00 ???@??.?.?.?.?`.
6. i2cget 使用方法
rk3568_r:/ # i2cget --help usage: i2cget [-fy] BUS CHIP ADDR Read an i2c register. -f Force access to busy devices -y Answer "yes" to confirmation prompts (for script use)
7. 获取设备指定寄存器地址的值
rk3568_r:/ # i2cget -fy 0 0x20 0x12 0x03
8. i2cset 使用方法
130|rk3568_r:/ # i2cset --help usage: i2cset [-fy] BUS CHIP ADDR VALUE... MODE Write an i2c register. MODE is b for byte, w for 16-bit word, i for I2C block. -f Force access to busy devices -y Answer "yes" to confirmation prompts (for script use)
9. 设置设备指定寄存器地址的值
rk3568_r:/ # i2cset -fy 0 0x20 0x12 0x04 b
