qmk_firmware/FAQ.md

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# Build
## 'make clean' needs after changing config.h
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To build with new **config.h** you need
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$ make clean
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## WINAVR is obsolete
It is no longer recommended and may cause some problem.
See [Issue #99](https://github.com/tmk/tmk_keyboard/issues/99).
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# Degug Console
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## hid_listen can't find device
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When debug console of your device is not ready you will see like this:
Waiting for device:.........
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once the device is pluged in then *hid_listen* finds it you will get this message:
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Waiting for new device:.........................
Listening:
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Check if you can't get this 'Listening:' message:
- build with `CONSOLE_ENABLE=yes` in **Makefile**.
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## Can't get message from console
Check:
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- connect the device to *hid_listen*. See above.
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- push **LShift+RShift+d** to enable debug. See [Magic Commands](https://github.com/tmk/tmk_keyboard#magic-commands).
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- set `debug_enable=yes` usually in `matrix_init()` in **matrix.c**.
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- try using 'print' function instead of debug print. See **common/print.h**.
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- disconnect other devices with console function. See [Issue #97](https://github.com/tmk/tmk_keyboard/issues/97).
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***
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# Miscellaneous
## NKRO Doesn't work
Build with this option of Makefile
NKRO_ENABLE = yes
And use `Magic` command **N** to toggle NKRO feature.
At this time NKRO is not used by default even if it is build with `NKRO_ENABLE`, you still need the `Magic`.
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## TrackPoint needs reset circuit(PS/2 mouse support)
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Without reset circuit you will have inconsistent reuslt due to improper initialize of the hardware. See circuit schematic of TPM754.
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http://geekhack.org/index.php?topic=50176.msg1127447#msg1127447
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http://www.mikrocontroller.net/attachment/52583/tpm754.pdf