View source for N900 Hardware Bus I2c

[[: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 camera|Front 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]]