VAR-SOM-AM43 I2C: Difference between revisions
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{{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 45: | Line 46: | ||
= 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-0 0x51 On-SOM EEPROM - do not alter | |||
<br/> | <br/> | ||
<br/>I2C-1 | <br/>I2C-1 0x38 Capacitive touch panel | ||
<br/>I2C-1 | <br/>I2C-1 0x68 RTC | ||
Latest revision as of 13:20, 24 December 2015
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
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