VAR-SOM-AM43 I2C: Difference between revisions
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{{PageHeader|VAR-SOM- | {{PageHeader|VAR-SOM-AM43 - I2C}} {{DocImage|category1=VAR-SOM-AM43|category2=Yocto}} __toc__ | ||
= Available I2C buses = | = Available I2C buses = | ||
List I2C available devices: | List I2C available devices: | ||
| Line 15: | Line 12: | ||
Scan bus 0: | Scan bus 0: | ||
<pre> | <pre> | ||
root@ | root@varsomam43:~# i2cdetect -y -r 0 | ||
0 1 2 3 4 5 6 7 8 9 a b c d e f | 0 1 2 3 4 5 6 7 8 9 a b c d e f | ||
00: -- -- -- -- -- -- -- -- -- -- -- -- -- | 00: -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
10: -- -- -- -- -- -- -- -- -- -- -- | 10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- -- | ||
20: -- -- -- -- | 20: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- -- | ||
30: -- -- -- -- -- -- -- -- -- -- -- -- | 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
50: | 50: 50 51 -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | ||
70: -- -- -- -- -- -- -- -- | 70: -- -- -- -- -- -- -- -- | ||
</pre> | </pre> | ||
Scan bus 1: | Scan bus 1: | ||
<pre> | <pre> | ||
root@ | root@varsomam43:~# i2cdetect -y -r 1 | ||
0 1 2 3 4 5 6 7 8 9 a b c d e f | 0 1 2 3 4 5 6 7 8 9 a b c d e f | ||
00: -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
30: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- | |||
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- | |||
70: -- -- -- -- -- -- -- -- | |||
00: -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
30: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- | |||
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |||
60: -- -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- | |||
70: -- -- -- -- -- -- -- -- | |||
</pre> | </pre> | ||
= Reading / Writing from an I2C device= | = Reading / Writing from an I2C device= | ||
Variscite includes I2CTools as a part of the default file system build | Variscite includes I2CTools as a part of the default file system build. examples of optional commands: <br> | ||
i2cdump - dump the content of an I2C device <br> | i2cdump - dump the content of an I2C device <br> | ||
i2cset - write a single character to an I2C device<br> | i2cset - write a single character to an I2C device<br> | ||
i2cget - read a single character to an I2C device.<br> | i2cget - read a single character to an I2C device.<br> | ||
<br> | <br> | ||
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's system integrated I2C devices = | ||
{{note|Note:Don't manipulate Variscite's on-SOM | {{note|Note:Don't manipulate Variscite's on-SOM devices, or you will damage the SOM!|info}} | ||
When the device is marked with "UU" it says a driver is using it. | When the device is marked with "UU" it says a driver is using it. | ||
<br/>Driver with numbers are available. | <br/>Driver with numbers are available. | ||
<br/>Variscite devices: | <br/>Variscite devices: | ||
<br/>I2C-0 | <br/>I2C-0 0x1B On SOM Audio Codec - do not alter | ||
<br/>I2C-0 0x24 On SOM PMIC - do not alter | |||
<br/>I2C-0 0x50 On-SOM EEPROM - do not alter | |||
<br/>I2C- | <br/>I2C-0 0x51 On-SOM EEPROM - do not alter | ||
<br/>I2C- | |||
<br/>I2C- | |||
<br/> | <br/> | ||
<br/>I2C- | <br/>I2C-1 0x38 Capacitive touch panel | ||
<br/>I2C- | <br/>I2C-1 0x68 RTC | ||
Latest revision as of 13:20, 24 December 2015
VAR-SOM-AM43 - I2C
Available I2C buses
List I2C available devices:
root@varsomam43:~# ls -l /dev/i2c-* crw------- 1 root root 89, 0 Dec 24 13:50 /dev/i2c-0 crw------- 1 root root 89, 1 Dec 24 13:50 /dev/i2c-1
I2C devices per bus
Scan bus 0:
root@varsomam43:~# i2cdetect -y -r 0
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- UU -- -- -- --
20: -- -- -- -- UU -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: 50 51 -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
Scan bus 1:
root@varsomam43:~# 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: -- -- -- -- -- -- -- -- 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 devices, 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-0 0x1B On SOM Audio Codec - do not alter
I2C-0 0x24 On SOM PMIC - do not alter
I2C-0 0x50 On-SOM EEPROM - do not alter
I2C-0 0x51 On-SOM EEPROM - do not alter
I2C-1 0x38 Capacitive touch panel
I2C-1 0x68 RTC