DART-SD410 Debian I2C: Difference between revisions
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<pre> | <pre> | ||
# ls -l /dev/i2c-* | # ls -l /dev/i2c-* | ||
crw-rw---- 1 root i2c 89, 1 | crw-rw---- 1 root i2c 89, 0 Nov 3 2016 /dev/i2c-0 | ||
crw-rw---- 1 root i2c 89, 3 | 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 | |||
</pre> | </pre> | ||
System class: | System class: | ||
<pre> | <pre> | ||
# ls /sys/class/i2c-dev/ | # ls /sys/class/i2c-dev/ | ||
i2c-1 i2c-3 | i2c-0 i2c-1 i2c-3 | ||
</pre> | </pre> | ||
Revision as of 09:08, 13 August 2017
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