Editing N900 Hardware Bus I2c

Warning: You are not logged in. Your IP address will be recorded in this page's edit history.

The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.

Learn more about Contributing to the wiki.

[[:wikipedia:I2C|I2C]] is a simple serial bus, used in many devices.

==Hardware==

===Bus 1===
* 0x48 0x49 0x4a 0x4b [[N900 Hardware Chipset|Gaia/chipset]]

===Bus 2===
* 0x18 0x19 [[N900 Hardware Audio Codec|Audio codec]]
* 0x29 [[N900 light meter]]
* 0x30 [[N900 Hardware Flash Torch]]
* 0x32 [[N900 Hardware LED]]
* 0x60 [[N900 headphone amplifier]]
* 0x63 [[N900 FM radio transmitter|FM radio transmitter]]
* 0x55 [[N900 Hardware Charge Meter]]
* 0x6B [[N900 Hardware Battery Charger]]
* 0x10 [[N900 Front VGA camera|VGA Camera (control)]]

===Bus 3===
* 0x0c [[N900 Hardware Autofocus|Lens focus ]]
* 0x1d [[N900 accelerometer|Accelerometer]]
* 0x22 [[N900 FM radio receiver|FM Receiver]]
* 0x3e [[N900 camera sensor|Main Camera (control)]]

===Bus ?===
* 0x? [[N900 Hardware GPS|GPS]]
edit: GPS is connected to RAPUYAMA and available to application processor only via libisi / cellmo-proxy

==Software==

The [[Nokia N900|N900]] software driving I2C comes in three flavors.

Firstly, there are a large number of kernel drivers.

Then, there are a small number of devices 'bit banged' through I2C ioctls - BME for example does this with the [[N900 Hardware Charge Meter|charge meter]] and [[N900 Hardware Battery Charger|battery charger]].

Finally, there are probably some I2C components in the Rapuyama and assorted cellphone/GPS hardware. These are not visible to the casual developer. (you have to open the N900 and probe stuff, or hack the phone firmware).

[[Category:N900 Hardware]]

Please note that all contributions to maemo.org wiki may be edited, altered, or removed by other contributors. If you do not want your writing to be edited mercilessly, then do not submit it here.
You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource (see maemo.org wiki:Copyrights for details). Do not submit copyrighted work without permission!

Summary:

Cancel | Editing help (opens in new window)

Retrieved from "http://wiki.maemo.org/N900_Hardware_Bus_I2c"

Personal tools

Navigation

Views

Editing N900 Hardware Bus I2c

@@ Line 15: / Line 15: @@
 * 0x55 [[N900 Hardware Charge Meter]]
 * 0x6B [[N900 Hardware Battery Charger]]
-* 0x10 [[N900 Front camera|Front VGA Camera (control)]]
+* 0x10 [[N900 Front VGA camera|VGA Camera (control)]]
 ===Bus 3===