serial_port_modification
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serial_port_modification [2011/08/11 23:43] – ggrandou | serial_port_modification [2011/08/22 21:31] (current) – frantonym | ||
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====== Serial Port Modification ====== | ====== Serial Port Modification ====== | ||
- | Tegra2 SoC has 4 standard serial ports available. One of them is often used as the Console port both for the Fastboot Android Bootloader and for the kernel console. This port is not directly | + | Tegra2 SoC has 4 standard serial ports available. One of them is often used as the Console port both for the Fastboot Android Bootloader and for the kernel console. This port is not directly |
This page explains how to add serial port to an USB port on your host PC. | This page explains how to add serial port to an USB port on your host PC. | ||
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===== Introduction ===== | ===== Introduction ===== | ||
+ | {{: | ||
+ | A standard CA42 Nokia cable. Well, almost " | ||
+ | |||
+ | {{: | ||
+ | Cut the useless phone connector. Using an ohmmeter, we can identify wires, knowing the Nokia pinout. | ||
+ | On this cable: | ||
+ | * pin 4 - red - 3.3V (used to power the serial-usb transceiver) | ||
+ | * pin 6 - blue - phone RX | ||
+ | * pin 7 - white - phone TX | ||
+ | * pin 8 - black - GND. | ||
+ | Pinout can be found on this page: http:// | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | Dismantled AC100 | ||
+ | |||
+ | {{: | ||
+ | The serial port is the JP1 connector, near the left speaker connector. Pinout, from right to left: | ||
+ | * 1 - in - RX | ||
+ | * 2 - out - TX | ||
+ | * 3 - out - T20_WAKE# | ||
+ | * 4 - out - +3V | ||
+ | * 5 - out - +1.8V | ||
+ | * 678 - in - SYSTEM_RESET# | ||
+ | * 9 - in - EC_TX80_PDATA | ||
+ | * 10 - in - GND | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | 1st try.black - GNDred - +3.3V, to power up the " | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | Now, let's do things cleanly.a small 4 pin connector (thank you Fifi!). Cable is passed through the Kensington lock hole, so that I don't have to do any mechanical degradation to the AC100 cover. Cable is tied to the AC100 using a hot glue gun. I have used very thin wrapping wires for two reasons: | ||
+ | - the JP1 connector is really small, smaller than the cable | ||
+ | - and my cable was too short anyway! | ||
+ | Some adhesive is used to isolate wires from the conductive paint and from the keyboard once it will be put back. | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
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+ | Serial port is plugged. let's boot... it works ;) | ||
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+ | {{: | ||
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+ | {{: | ||
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+ | ===== misc ===== | ||
+ | |||
+ | {{: | ||
serial_port_modification.txt · Last modified: 2011/08/22 21:31 by frantonym