root@rk3576-buildroot:~# i2cdump -fy 3 0x18 No size specified (using byte-data access) WARNING! This program can confuse your I2C bus, cause data loss and worse! I will probe file /dev/i2c-3, address 0x18, mode byte Continue? [Y/n] y 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 00 00 60 00 03 91 03 1d 4c 00 00 83 85 00 40 02 ..`.????L..??.@? 10: 00 08 85 83 40 01 00 04 00 00 01 30 00 01 81 00 .???@?.?..?0.??. 20: 00 00 00 00 00 cc 11 00 00 00 00 00 00 00 00 00 .....??......... 30: 00 00 00 00 00 12 03 02 02 00 00 00 09 01 00 d4 .....????...??.? 40: 00 27 27 00 6f 38 00 00 00 00 00 ee 10 d8 7e e3 .''.o8.....???~? 50: 00 00 00 21 21 00 03 00 05 00 00 1f 00 00 03 00 ...!!.?.?..?..?. 60: 05 00 00 1f 00 00 00 00 00 00 00 00 00 00 00 00 ?..?............ 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 90: 00 00 00 00 00 00 00 00 00 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 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 ................ root@rk3576-buildroot:~# i2cset -fy 3 0x18 0 01 WARNING! This program can confuse your I2C bus, cause data loss and worse! I will write to device file /dev/i2c-3, chip address 0x18, data address 0x00, data 0x01, mode byte. Continue? [Y/n] y root@rk3576-buildroot:~# i2cdump -fy 3 0x18 No size specified (using byte-data access) WARNING! This program can confuse your I2C bus, cause data loss and worse! I will probe file /dev/i2c-3, address 0x18, mode byte Continue? [Y/n] y 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 01 00 00 08 08 00 00 00 00 0c 00 10 00 00 08 08 ?..??....?.?..?? 10: 7a 7a 0c 0c 00 00 00 00 00 00 00 00 00 00 00 00 zz??............ 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 30: 00 00 00 00 a2 00 80 20 00 80 00 00 00 00 00 30 ....?.? .?.....0 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 50: 00 00 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 00 00 00 00 00 00 00 00 00 00 05 00 00 00 00 ...........?.... 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 90: 00 00 00 00 00 00 00 00 00 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 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 ................ root@rk3576-buildroot:~#