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+## READ FIRST
+- **README** of top directory : https://github.com/tmk/tmk_keyboard/blob/master/README.md
+- **README** of target project(keyboard/converter) directory.
+
+Note that you'll need to read **both**.
+
+
+# Build
+- [[FAQ/Build]]
+
+
+# Keymap
+- [[FAQ/Keymap]]
+
+
+# Debug Console
+## hid_listen can't recognize device
+When debug console of your device is not ready you will see like this:
+
+    Waiting for device:.........
+
+once the device is pluged in then *hid_listen* finds it you will get this message:
+
+    Waiting for new device:.........................
+    Listening:
+
+Check if you can't get this 'Listening:' message:
+- build with `CONSOLE_ENABLE=yes` in **Makefile**.
+
+You may need privilege to access the device on OS like Linux.
+- try `sudo hid_listen`
+
+## Can't get message on console
+Check:
+- *hid_listen* finds your device. See above.
+- Enable debug with pressing **Magic**+d. See [Magic Commands](https://github.com/tmk/tmk_keyboard#magic-commands).
+- set `debug_enable=true` usually in `matrix_init()` in **matrix.c**.
+- try using 'print' function instead of debug print. See **common/print.h**.
+- disconnect other devices with console function. See [Issue #97](https://github.com/tmk/tmk_keyboard/issues/97).
+
+## Linux or UNIX like system requires Super User privilege
+Just use 'sudo' to execute *hid_listen* with privilege.
+```
+$ sudo hid_listen
+```
+
+Or add an *udev rule* for TMK devices with placing a file in rules directory. The directory may vary on each system.
+
+File: /etc/udev/rules.d/52-tmk-keyboard.rules(in case of Ubuntu)
+```
+# tmk keyboard products     https://github.com/tmk/tmk_keyboard
+SUBSYSTEMS=="usb", ATTRS{idVendor}=="feed", MODE:="0666"
+```
+
+***
+
+# Miscellaneous
+## NKRO Doesn't work
+First you have to compile frimware with this build option `NKRO_ENABLE` in **Makefile**.
+
+Try `Magic` **N** command(`LShift+RShift+N` by default) when **NKRO** still doesn't work. You can use this command to toggle between **NKRO** and **6KRO** mode temporarily. In some situations **NKRO** doesn't work you need to switch to **6KRO** mode, in particular when you are in BIOS.
+
+If your firmeare built with `BOOTMAGIC_ENABLE` you need to turn its switch on by `BootMagic` **N** command(`Space+N` by default). This setting is stored in EEPROM and keeped over power cycles.
+
+https://github.com/tmk/tmk_keyboard#boot-magic-configuration---virtual-dip-switch
+
+
+## TrackPoint needs reset circuit(PS/2 mouse support)
+Without reset circuit you will have inconsistent reuslt due to improper initialize of the hardware. See circuit schematic of TPM754.
+
+- http://geekhack.org/index.php?topic=50176.msg1127447#msg1127447
+- http://www.mikrocontroller.net/attachment/52583/tpm754.pdf
+
+
+## Can't read column of matrix beyond 16 
+Use `1UL<<16` instead of `1<<16` in `read_cols()` in **matrix.h** when your columns goes beyond 16.
+
+In C `1` means one of **int** type which is **16bit** in case of AVR so you can't shift left more than 15. You will get unexpected zero when you say `1<<16`. You have to use **unsigned long** type with `1UL`.
+
+http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279
+
+
+
+## Pull-up Resistor
+In some case converters needed to have pull-up resistors to work correctly. Place the resistor between VCC and signal line in parallel.
+
+For example:
+```
+Keyboard       Conveter
+               ,------.
+5V------+------|VCC   |
+        |      |      |
+        R      |      |
+        |      |      |
+Signal--+------|PD0   |
+               |      |
+GND------------|GND   |
+               `------'
+R: 1K Ohm resistor
+```
+
+https://github.com/tmk/tmk_keyboard/issues/71
+
+
+## Arduino Micro's pin naming is confusing
+Note that Arduino Micro PCB marking is different from real AVR port name. D0 of Arduino Micro is not PD0, PD0 is D3. Check schematic yourself.
+http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
+
+
+
+## Bootloader jump doesn't work
+Properly configure bootloader size in **Makefile**. With wrong section size bootloader won't probably start with **Magic command** and **Boot Magic**.
+```
+# Size of Bootloaders in bytes:
+#   Atmel DFU loader(ATmega32U4)   4096    
+#   Atmel DFU loader(AT90USB128)   8192    
+#   LUFA bootloader(ATmega32U4)    4096             
+#   Arduino Caterina(ATmega32U4)   4096             
+#   USBaspLoader(ATmega***)        2048             
+#   Teensy   halfKay(ATmega32U4)   512              
+#   Teensy++ halfKay(AT90USB128)   2048
+OPT_DEFS += -DBOOTLOADER_SIZE=4096
+```
+AVR Boot section size are defined by setting **BOOTSZ** fuse in fact. Consult with your MCU datasheet.
+Note that **Word**(2 bytes) size and address are used in datasheet while TMK uses **Byte**.
+
+AVR Boot section is located at end of Flash memory like the followings.
+```
+byte     Atmel/LUFA(ATMega32u4)          byte     Atmel(AT90SUB1286)
+0x0000   +---------------+               0x00000  +---------------+
+         |               |                        |               |
+         |               |                        |               |
+         |  Application  |                        |  Application  |
+         |               |                        |               | 
+         =               =                        =               =
+         |               | 32KB-4KB               |               | 128KB-8KB
+0x6000   +---------------+               0x1E000  +---------------+
+         |  Bootloader   | 4KB                    |  Bootloader   | 8KB
+0x7FFF   +---------------+               0x1FFFF  +---------------+
+
+ 
+byte     Teensy(ATMega32u4)              byte     Teensy++(AT90SUB1286)
+0x0000   +---------------+               0x00000  +---------------+
+         |               |                        |               |
+         |               |                        |               |
+         |  Application  |                        |  Application  |
+         |               |                        |               |
+         =               =                        =               =
+         |               | 32KB-512B              |               | 128KB-2KB
+0x7E00   +---------------+               0x1FC00  +---------------+
+         |  Bootloader   | 512B                   |  Bootloader   | 2KB
+0x7FFF   +---------------+               0x1FFFF  +---------------+
+```
+
+And see this discussion for further reference.
+https://github.com/tmk/tmk_keyboard/issues/179
+
+
+## Special Extra key doesn't work(System, Audio control keys)
+You need to define `EXTRAKEY_ENABLE` in **makefile** to use them in TMK.
+```
+EXTRAKEY_ENABLE = yes          # Audio control and System control
+```
+http://deskthority.net/workshop-f7/tmk-keyboard-firmware-collection-t4478-60.html#p157919
+
+
+## Wakeup from sleep doesn't work
+In Windows check `Allow this device to wake the computer` setting in Power **Management property** tab of **Device Manager**. Also check BIOS setting.
+
+Pressing any key during sleep should wake host.
+
+
+## Using Arduino?
+**Note that Arduino pin naming is different from actual chip.** For example, Arduino pin `D0` is not `PD0`. Check circuit with its schematics yourself.
+
+- http://arduino.cc/en/uploads/Main/arduino-leonardo-schematic_3b.pdf
+- http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
+
+Arduino leonardo and micro have **ATMega32U4** and can be used for TMK, though Arduino bootloader may be a problem.
+
+
+## Using PF4-7 pins of USB AVR?
+You need to set JTD bit of MCUCR yourself to use PF4-7 as GPIO. Those pins are configured to serve JTAG function by default. MCUs like ATMega*U* or AT90USB* are affeteced with this.
+
+If you are using Teensy this isn't needed. Teensy is shipped with JTAGEN fuse bit unprogrammed to disable the function.
+
+See this code.
+```
+    // JTAG disable for PORT F. write JTD bit twice within four cycles.
+    MCUCR |= (1<<JTD);
+    MCUCR |= (1<<JTD);
+```
+https://github.com/tmk/tmk_keyboard/blob/master/keyboard/hbkb/matrix.c#L67
+
+And read **26.5.1 MCU Control Register – MCUCR** of ATMega32U4 datasheet.
+
+
+## Adding LED indicators of Lock keys
+You need your own LED indicators for CapsLock, ScrollLock and NumLock? See this post.
+
+http://deskthority.net/workshop-f7/tmk-keyboard-firmware-collection-t4478-120.html#p191560
+
+## Program Arduino Micro/Leonardo
+Push reset button and then run command like this within 8 seconds.
+
+```
+avrdude -patmega32u4 -cavr109 -b57600 -Uflash:w:adb_usb.hex -P/dev/ttyACM0
+```
+
+Device name will vary depending on your system.
+
+http://arduino.cc/en/Main/ArduinoBoardMicro
+https://geekhack.org/index.php?topic=14290.msg1563867#msg1563867
+
+
+## USB 3 compatibility
+I heard some people have a problem with USB 3 port, try USB 2 port.
+
+
+## Mac compatibility
+### OS X 10.11 and Hub
+https://geekhack.org/index.php?topic=14290.msg1884034#msg1884034
+
+
+## Problem on BIOS(UEFI)/Resume(Sleep&Wake)/Power cycles
+Some people reported their keyboard stops working on BIOS and/or after resume(power cycles).
+
+As of now root of its cause is not clear but some build options seem to be related. In Makefile try to disable those options like `CONSOLE_ENABLE`, `NKRO_ENABLE`, `SLEEP_LED_ENABLE` and/or others. 
+
+https://github.com/tmk/tmk_keyboard/issues/266
+https://geekhack.org/index.php?topic=41989.msg1967778#msg1967778
+
+
+
+## FLIP doesn't work
+### AtLibUsbDfu.dll not found
+Remove current driver and reinstall one FLIP provides from DeviceManager.
+http://imgur.com/a/bnwzy
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