N900 Hardware Bus I2c

(New page: =Hardware= /sys/bus/i2c/drivers# ls -d */*-* ad5820/3-000c dummy/1-004a radio-si4713/2-0063 adp1653/2-0030 dummy/1-004b smia-sensor/2-0010 aic3...)
(→Bus 2: fixed)
 
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=Hardware=
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[[:wikipedia:I2C|I2C]] is a simple serial bus, used in many devices.
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/sys/bus/i2c/drivers# ls -d */*-*
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ad5820/3-000c          dummy/1-004a            radio-si4713/2-0063
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adp1653/2-0030          dummy/1-004b            smia-sensor/2-0010
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aic34b_dummy/2-0019    et8ek8/3-003e          tpa6130a2/2-0060
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aic3x I2C Codec/2-0018  lis302dl/3-001d        tsl2563/2-0029
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dummy/1-0049            lp5523/2-0032          twl4030/1-0048
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=Software=
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==Hardware==
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The n900 software driving I2C comes in three flavours.
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Firstly, there are a large number of kernel drivers.
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===Bus 1===
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* 0x48 0x49 0x4a 0x4b [[N900 Hardware Chipset|Gaia/chipset]]
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Then, there are a small number of devices 'bit banged' through I2C ioctls - BME for example does this.
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===Bus 2===
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* 0x18 0x19 [[N900 Hardware Audio Codec|Audio codec]]
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* 0x29 [[N900 light meter]]
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* 0x30 [[N900 Hardware Flash Torch]]
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* 0x32 [[N900 Hardware LED]]
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* 0x60 [[N900 headphone amplifier]]
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* 0x63 [[N900 FM radio transmitter|FM radio transmitter]]
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* 0x55 [[N900 Hardware Charge Meter]]
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* 0x6B [[N900 Hardware Battery Charger]]
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* 0x10 [[N900 Front camera|Front VGA Camera (control)]]
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===Bus 3===
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* 0x0c [[N900 Hardware Autofocus|Lens focus ]]
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* 0x1d [[N900 accelerometer|Accelerometer]]
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* 0x22 [[N900 FM radio receiver|FM Receiver]]
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* 0x3e [[N900 camera sensor|Main Camera (control)]]
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===Bus ?===
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* 0x? [[N900 Hardware GPS|GPS]]
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edit: GPS is connected to RAPUYAMA and available to application processor only via libisi / cellmo-proxy
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==Software==
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The [[Nokia N900|N900]] software driving I2C comes in three flavors.
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Firstly, there are a large number of kernel drivers.
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Finally, there are probably some I2C components in the Rapuyama and assorted cellphone/GPS hardware. These are not visible to the casual developer.
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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]].
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(you have to open the n900 and probe stuff, or hack the phone firmware).
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 +
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]]
[[Category:N900 Hardware]]

Latest revision as of 12:42, 5 July 2016

I2C is a simple serial bus, used in many devices.

Contents

[edit] Hardware

[edit] Bus 1

[edit] Bus 2

[edit] Bus 3

[edit] Bus ?

edit: GPS is connected to RAPUYAMA and available to application processor only via libisi / cellmo-proxy

[edit] Software

The 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 charge meter and 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).

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