DART-SD410 Debian I2C

DART-SD410 - I2C

Available I2C buses

List I2C available devices:

# ls -l /dev/i2c-*
crw-rw---- 1 root i2c 89, 0 Nov  3  2016 /dev/i2c-0
crw-rw---- 1 root i2c 89, 1 Nov  3  2016 /dev/i2c-1
crw-rw---- 1 root i2c 89, 3 Nov  3  2016 /dev/i2c-3

System class:

# ls /sys/class/i2c-dev/
i2c-0  i2c-1  i2c-3

I2C devices per bus

Scan bus 1:
This operation will take about 2 minutes

root@linaro-alip:~# i2cdetect -y -r 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
                    

Scan bus 3:
This operation will take about 2 minutes

root@linaro-alip:~# i2cdetect -y -r 3
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- UU -- -- --
30: -- -- -- -- -- -- -- -- 38 UU -- -- UU -- -- UU
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 -- -- -- -- -- -- -- -- -- -- -- -- -- --
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 to 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:Don't 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-1 0x38 Touch controller

• I2C-3 0x2C DSI to LVDS bridge
• I2C-3 0x38 DSI to HDMI bridge
• I2C-3 0x39 DSI to HDMI bridge
• I2C-3 0x3C DUMMY driver
• I2C-3 0x3F DUMMY driver
• I2C-3 0x50 SOM EEPROM - do not alter
• I2C-3 0x51 SOM EEPROM - do not alter
• I2C-3 0x56 On-SOM EEPROM - do not alter
• I2C-3 0x57 On-SOM EEPROM - do not alter
• I2C-3 0x68 VAR-SD410CustomBoard DS1307 RTC