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发表于 2017-5-2 15:52:53| 字数 3,025| - 美国 弗吉尼亚州
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hi!
I would like to show everyone my X62T with working wacom EMR pen. Sorry for the English. I don't think I can explain well in Chinese.
el-sahef from the German thinkpad forum was the first one to do this. You can see here:
https://thinkpad-forum.de/threads/202543-X62-Erster-Eindruck-(jetzt-m-Bildern)?p=2045818&viewfull=1#post2045818
I did not follow the same plan as el-sahef or previous posts on 51nb for installing the X62 motherboard in the chassis. el-sahef rebuilt the SATA/power connector to make the SSD fit in the compartment. Instead of doing that, or modifying the chassis like seen before on 51nb, I took the SSD board out of the housing and attached it directly. It is still a bit crooked, but it works OK without any other changes. Everything else fit OK without changes. Removing the SSD housing also gives more space to fit the extra parts for the tablet conversion.
important warning: There is a capacitor near an inductor by the DIMM slots that may short circuit on the chassis unless you insulate it with tape. I think it's C1047, not sure.
To use the wacom pen, you need an ATmega32u4 microcontroller board with the waxbee firmware loaded. Teensy 2.0 is the easiest board to use. You can get the waxbee tool here: https://github.com/popbee/waxbee/releases/
However, instead of creating firmware with the waxbee tool, you can try using the same firmware el-sahef already made. It is linked at the end of his post here:
https://thinkpad-forum.de/threads/202543-X62-Erster-Eindruck-(jetzt-m-Bildern)?p=2072386&viewfull=1#post2072386
There's also a link to the working wacom driver (version 6.2.0w5).
If it doesn't work, you will need to use the waxbee config tool to customize the firmware.
I'm using the internal USB port near the fan connector to attach the the microcontroller. I have also added a USB hub so that I can also connect a USB wifi adapter internally to replace the mini pci-e wifi adapter. I'm using the mini pci-e slot for an external GPU, running the connector ribbon out through the PCMCIA slot. This is not related at all to the tablet conversion.
The wacom digitizer needs to be wired to the microcontroller board:
digitizer pin 1: GND
digitizer pin 9: RX (D2 on Teensy 2.0)
digitizer pin 10: TX (D3 on Teensy 2.0)
digitizer pin 11: GND
digitizer pin 12: reset (optional, can use Teensy 2.0 D5)
digitizer pin 13: VCC 3.3v
digitizer pin 14: GND
digitizer connector: GND
You can use the metal chassis for GND.
I ran wires from the digitizer connector behind the LCD through the hinge and to the microcontroller in the main body. I have the microcontroller, voltage regulator, and USB hub all underneath the SSD board inside the SATA compartment. el-sahef placed them behind the LCD, but I noticed pressure ripples on the LCD when drawing with it that way.
Pin 12 (reset) is probably not required, but may help for debugging. You can edit the waxbee firmware using the config tool to send pulses to the reset pin if you are having trouble activating the digitizer. If you have a specific problem, the waxbee forum (http://forum.bongofish.co.uk/) is probably the best place for help.
The digitizer needs 3.3v to work. I used a 3.3v regulator to convert from USB 5v, but you may be able to find a 3.3v source already on the motherboard. Fingerprint reader connector might be 3.3v.
If you want, you can also use another ATmega32u4 microcontroller to make the tablet buttons work. The simpliest way is to wire the switches directly to the microcontroller and program it to be recognized as a basic input device. Interfacing with the existing button controller is a lot more work.
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