DART-6UL I2C
From Variscite Wiki
DART-6UL - I2C
Available I2C buses
List I2C available devices:
root@imx6ul-var-dart:~# ls -l /dev/i2c-* crw------- 1 root root 89, 0 Dec 28 09:28 /dev/i2c-0 crw------- 1 root root 89, 1 Dec 28 09:28 /dev/i2c-1
System class:
root@imx6ul-var-dart:~# ls /sys/class/i2c-dev/ i2c-0 i2c-1
I2C devices per bus
Scan bus 0:
root@imx6ul-var-dart:~# i2cdetect -y -r 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Scan bus 1:
root@imx6ul-var-dart:~# i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 52 53 -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Reading / Writing from an I2C device
Variscite includes I2CTools as a part of the default file system build, examples of optional commands:
i2cdump - dump the content of an I2C device
i2cset - write a single character to an I2C device
i2cget - read a single character from an I2C device.
In addition follow 'C' code example as describe in the linux kernel documentation : https://www.kernel.org/doc/Documentation/i2c/dev-interface
Variscite's system integrated I2C devices
Note: Do not manipulate Variscite's on-SOM EEPROM, or you will damage the SOM!
When the device is marked with "UU" it says a driver is using it.
Driver with numbers are available.
Variscite devices:
I2C-2 0x38 – focaltech touch I2C-2 0x68 - RTC On carrier I2C-2 0x52 - EEPROM on carrier I2C-2 0x53 - EEPROM on carrier I2C-2 0x1A – audio codec I2C-2 0x50 - EEPROM on SOM. Do not write to it! I2C-2 0x51 - EEPROM on SOM. Do not write to it!