MX8 I2C: Difference between revisions

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--> {{PageHeader|{{#var:HARDWARE_NAME}} I2C}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}}}} __toc__
--> {{PageHeader|{{#var:HARDWARE_NAME}} I2C}} {{DocImage|category1=Yocto|category2={{#var:HARDWARE_NAME}}}} __toc__


= Available I2C buses =
= Available I2C buses =
List I2C available devices:
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
List available I2C buses:
<pre>
<pre>
# ls -l /dev/i2c-*
# ls -l /dev/i2c-*
Line 14: Line 14:
</pre>
</pre>
|
|
List available I2C buses on VAR-SOM-MX8
<pre>
<pre>
# ls -l /dev/i2c-*
crw------- 1 root root 89, 0 Jun 12 12:43 /dev/i2c-0
crw------- 1 root root 89, 0 Jun 12 12:43 /dev/i2c-0
crw------- 1 root root 89, 1 Jun 12 12:43 /dev/i2c-1
crw------- 1 root root 89, 1 Jun 12 12:43 /dev/i2c-1
crw------- 1 root root 89, 4 Jun 12 12:43 /dev/i2c-4
crw------- 1 root root 89, 4 Jun 12 12:43 /dev/i2c-4
</pre>
<br>List available I2C buses on SPEAR-MX8
<pre>
# ls -l /dev/i2c-*
crw------- 1 root root 89, 0 Jul 16 12:22 /dev/i2c-0
crw------- 1 root root 89, 1 Jul 16 12:22 /dev/i2c-1
crw------- 1 root root 89, 2 Jul 16 12:22 /dev/i2c-2
crw------- 1 root root 89, 4 Jul 16 12:22 /dev/i2c-4
crw------- 1 root root 89, 5 Jul 16 12:22 /dev/i2c-5
crw------- 1 root root 89, 6 Jul 16 12:22 /dev/i2c-6
</pre>
</pre>
}}
}}


{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
System class:
System class:
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
<pre>
<pre>
# ls /sys/class/i2c-dev/
# ls /sys/class/i2c-dev/
Line 28: Line 41:
</pre>
</pre>
|
|
System class on VAR-SOM-MX8:
<pre>
<pre>
# ls /sys/class/i2c-dev/
# ls /sys/class/i2c-dev/
i2c-0  i2c-1  i2c-4
i2c-0  i2c-1  i2c-4
</pre>
<br> System class on SPEAR-MX8:
<pre>
# ls /sys/class/i2c-dev/
i2c-0  i2c-1  i2c-2  i2c-4  i2c-5  i2c-6
</pre>
</pre>
}}
}}
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In addition follow 'C' code example as describe in the Linux kernel documentation: https://www.kernel.org/doc/Documentation/i2c/dev-interface
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 =
= Variscite system integrated I2C devices =
{{note|Note: Don't manipulate Variscite on-SOM EEPROM, or you will damage the SOM!|info}}
{{note|Note: Don't manipulate Variscite on-SOM EEPROM, or you will damage the SOM!|info}}
When the device is marked with "UU" it means that a driver is using it.
When the device is marked with "UU" it means that a driver is using it.
<br/>When the device is marked with numbers it means that no driver is using it.
<br/>When the device is marked with numbers it means that no driver is using it.
<br/>Variscite devices:
 
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
{{#ifeq: {{#var:HARDWARE_NAME}} | VAR-SOM-MX8X |
<br>Variscite devices:
<pre>
<pre>
I2C-0 0x1a - Audio codec on SOM
I2C-0 0x1a - Audio codec on SOM
Line 146: Line 167:
</pre>
</pre>
|
|
<br>Variscite devices on VAR-SOM-MX8:
<pre>
<pre>
I2C-0 0x1a - Audio codec on SOM
I2C-0 0x1a - Audio codec on SOM
Line 160: Line 182:
I2C-4 0x68 – RTC on carrier board
I2C-4 0x68 – RTC on carrier board
</pre>
</pre>
<br>Variscite devices on SPEAR-MX8:
<pre>
I2C-0 0x54 - EEPROM on carrier board
I2C-0 0x55 - EEPROM on carrier board
I2C-0 0x68 – RTC on carrier board
I2C-1 0x3d – USB Type C controller on carrier board
I2C-2 0x08 – USB3 Hub
I2C-4 0x1a - Audio codec on SOM
I2C-5 0x3c – MIPI-CSI camera on expansion board
I2C-6 0x3c – MIPI-CSI camera on expansion board
</pre>
}}
}}

Revision as of 10:25, 8 October 2019

I2C

Available I2C buses

List available I2C buses on VAR-SOM-MX8 

# ls -l /dev/i2c-*
crw------- 1 root root 89, 0 Jun 12 12:43 /dev/i2c-0
crw------- 1 root root 89, 1 Jun 12 12:43 /dev/i2c-1
crw------- 1 root root 89, 4 Jun 12 12:43 /dev/i2c-4


List available I2C buses on SPEAR-MX8 

# ls -l /dev/i2c-*
crw------- 1 root root 89, 0 Jul 16 12:22 /dev/i2c-0
crw------- 1 root root 89, 1 Jul 16 12:22 /dev/i2c-1
crw------- 1 root root 89, 2 Jul 16 12:22 /dev/i2c-2
crw------- 1 root root 89, 4 Jul 16 12:22 /dev/i2c-4
crw------- 1 root root 89, 5 Jul 16 12:22 /dev/i2c-5
crw------- 1 root root 89, 6 Jul 16 12:22 /dev/i2c-6

System class on VAR-SOM-MX8: 

# ls /sys/class/i2c-dev/
i2c-0  i2c-1  i2c-4


System class on SPEAR-MX8: 

# ls /sys/class/i2c-dev/
i2c-0  i2c-1  i2c-2  i2c-4  i2c-5  i2c-6

I2C devices per bus

Scan bus 0: 

# i2cdetect -y -r 0
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- 52 53 -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --

Scan bus 1: 

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

Scan bus 4: 

# i2cdetect -y -r 4
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- 54 55 -- -- -- -- -- -- -- -- -- -- 
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 system integrated I2C devices

Note: Don't manipulate Variscite on-SOM EEPROM, or you will damage the SOM!

When the device is marked with "UU" it means that a driver is using it.
When the device is marked with numbers it means that no driver is using it.


Variscite devices on VAR-SOM-MX8: 

I2C-0 0x1a - Audio codec on SOM
I2C-0 0x52 - EEPROM on SOM. Don't modify!
I2C-0 0x53 - EEPROM on SOM. Don't modify!

I2C-1 0x20 – GPIO expander on carrier board
I2C-1 0x3c – MIPI-CSI camera on expansion board
I2C-1 0x3d – USB Type C controller on carrier board

I2C-4 0x38 – Capacitive touch controller on carrier board
I2C-4 0x54 - EEPROM on carrier board
I2C-4 0x55 - EEPROM on carrier board
I2C-4 0x68 – RTC on carrier board


Variscite devices on SPEAR-MX8: 

I2C-0 0x54 - EEPROM on carrier board
I2C-0 0x55 - EEPROM on carrier board
I2C-0 0x68 – RTC on carrier board

I2C-1 0x3d – USB Type C controller on carrier board

I2C-2 0x08 – USB3 Hub

I2C-4 0x1a - Audio codec on SOM

I2C-5 0x3c – MIPI-CSI camera on expansion board

I2C-6 0x3c – MIPI-CSI camera on expansion board
Retrieved from "https://variwiki.com/index.php?title=MX8_I2C&oldid=11830"
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This page was last edited on 8 October 2019, at 10:25.

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