MoBo I/O: Difference between revisions
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Many [re]purposes and debug efforts could aided by a comprehensive description of the various low level protocols available on the XO motherboard. |
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There are a variety of headless and headed connectors visible on the XO. The following is an attempt to identify them completely. |
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= Connectors = |
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== Headerless == |
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** CN1 - front side of motherboard, right of MIC jack |
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** CN19 - above RAM & "3.3V" label |
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** [[Serial_adapters#Console/Serial connector -J1|CN24 - top left of backup battery]] |
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** CN31 - top right of backup battery |
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** CN34 - below MIC header |
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== Headed == |
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=== Back === |
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** [[Serial_adapters#Console/Serial connector -J1|J1 - top left of southbridge]] (3.3v serial port to talk to CPU) |
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** CN21 - bottom right of CN22 |
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*** PWR in from battery |
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** CN22 - bottom left of backup battery |
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*** 1-wire(microlan) interface for battery |
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** CN23 - right of SD slot |
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*** Keyboard connector - LV PS/2 |
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*** [[Image:KB3700-ds-01.pdf]] |
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** CN26+CN25 - below left and right bottom USB port, respectively |
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*** Speaker headers |
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=== Front === |
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** CN28 - right of MIC jack |
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*** backlight FFC slot |
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** CN15 - right of MIC-jack side USB plug |
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*** MIC header |
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** CON4 - bottom of USB plugs on L side of mobo |
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*** Camera FFC slot |
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** CN27 - top of motherboard |
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*** Screen pinout |
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== Protocols == |
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The XO motherboard also features several standard high and low level protocols. |
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* I2C |
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** Theoretically used for the DCON - A datasheet should be obtained for the Himax HX8837 chip and the I2C pins/traces should be identified. |
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** /dev/i2c-0 |
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* 3.3v TTL Serial |
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** Easily accessible using a [http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2008 3.3v level converter] and a [http://www.usdigital.com/products/cables-connectors/cables/4-pin/ca-mic4-sh-nc/ proper cable]. |
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** /dev/ttyS0 |
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= Wanted = |
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* Datasheets for all major chips on the XO |
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* Python, C, or SH code to control the VGA GPIO |
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* The location + code for any and all other GPIOs |
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* Positive identification of all aforementioned headers / solder pads / FFC slots |
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* Positive pinouts for all aforementioned headers / solder pads / FFC slots |
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* Pinout for non-standard VGA connector |
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[[Category:Hardware]] |
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