|  |  | # Debugging FAQ
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							|  |  | 
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							|  |  | This page details various common questions people have about troubleshooting their keyboards.
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							|  |  | 
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							|  |  | # Debug Console
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							|  |  | 
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							|  |  | ## `hid_listen` Can't Recognize Device
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							|  |  | When debug console of your device is not ready you will see like this:
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							|  |  | 
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							|  |  | ```
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							|  |  | Waiting for device:.........
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							|  |  | ```
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							|  |  | 
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							|  |  | once the device is plugged in then *hid_listen* finds it you will get this message:
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							|  |  | 
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							|  |  | ```
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							|  |  | Waiting for new device:.........................
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							|  |  | Listening:
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							|  |  | ```
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							|  |  | 
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							|  |  | If you can't get this 'Listening:' message try building with `CONSOLE_ENABLE=yes` in [Makefile]
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							|  |  | 
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							|  |  | You may need privilege to access the device on OS like Linux.
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							|  |  | - try `sudo hid_listen`
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							|  |  | 
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							|  |  | ## Can't Get Message on Console
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							|  |  | Check:
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							|  |  | - *hid_listen* finds your device. See above.
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							|  |  | - Enable debug with pressing **Magic**+d. See [Magic Commands](https://github.com/tmk/tmk_keyboard#magic-commands).
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							|  |  | - set `debug_enable=true` 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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							|  |  | ## Linux or UNIX Like System Requires Super User Privilege
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							|  |  | Just use 'sudo' to execute *hid_listen* with privilege.
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							|  |  | ```
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							|  |  | $ sudo hid_listen
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							|  |  | ```
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							|  |  | 
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							|  |  | Or add an *udev rule* for TMK devices with placing a file in rules directory. The directory may vary on each system.
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							|  |  | 
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							|  |  | File: /etc/udev/rules.d/52-tmk-keyboard.rules(in case of Ubuntu)
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							|  |  | ```
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							|  |  | # tmk keyboard products     https://github.com/tmk/tmk_keyboard
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							|  |  | SUBSYSTEMS=="usb", ATTRS{idVendor}=="feed", MODE:="0666"
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							|  |  | ```
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							|  |  | 
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							|  |  | ***
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							|  |  | 
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							|  |  | # Miscellaneous
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							|  |  | ## Safety Considerations
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							|  |  | 
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							|  |  | You probably don't want to "brick" your keyboard, making it impossible
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							|  |  | to rewrite firmware onto it.  Here are some of the parameters to show
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							|  |  | what things are (and likely aren't) too risky.
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							|  |  | 
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							|  |  | - If your keyboard map does not include RESET, then, to get into DFU
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							|  |  |   mode, you will need to press the reset button on the PCB, which
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							|  |  |   requires unscrewing the bottom.
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							|  |  | - Messing with tmk_core / common files might make the keyboard
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							|  |  |   inoperable
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							|  |  | - Too large a .hex file is trouble; `make dfu` will erase the block,
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							|  |  |   test the size (oops, wrong order!), which errors out, failing to
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							|  |  |   flash the keyboard, leaving it in DFU mode.
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							|  |  |   - To this end, note that the maximum .hex file size on Planck is
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							|  |  |     7000h (28672 decimal)
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							|  |  | 
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							|  |  | ```
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							|  |  | Linking: .build/planck_rev4_cbbrowne.elf                                                            [OK]
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							|  |  | Creating load file for Flash: .build/planck_rev4_cbbrowne.hex                                       [OK]
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							|  |  | 
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							|  |  | Size after:
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							|  |  |    text    data     bss     dec     hex filename
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							|  |  |       0   22396       0   22396    577c planck_rev4_cbbrowne.hex
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							|  |  | ```
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							|  |  | 
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							|  |  |   - The above file is of size 22396/577ch, which is less than
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							|  |  |     28672/7000h
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							|  |  |   - As long as you have a suitable alternative .hex file around, you
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							|  |  |     can retry, loading that one
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							|  |  |   - Some of the options you might specify in your keyboard's Makefile
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							|  |  |     consume extra memory; watch out for BOOTMAGIC_ENABLE,
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							|  |  |     MOUSEKEY_ENABLE, EXTRAKEY_ENABLE, CONSOLE_ENABLE, API_SYSEX_ENABLE
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							|  |  | - DFU tools do /not/ allow you to write into the bootloader (unless
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							|  |  |   you throw in extra fruit salad of options), so there is little risk
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							|  |  |   there.
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							|  |  | - EEPROM has around a 100000 write cycle.  You shouldn't rewrite the
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							|  |  |   firmware repeatedly and continually; that'll burn the EEPROM
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							|  |  |   eventually.
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							|  |  | ## NKRO Doesn't work
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							|  |  | First you have to compile firmware with this build option `NKRO_ENABLE` in **Makefile**.
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							|  |  | 
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							|  |  | 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.
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							|  |  | 
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							|  |  | If your firmware 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 kept over power cycles.
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							|  |  | 
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							|  |  | https://github.com/tmk/tmk_keyboard#boot-magic-configuration---virtual-dip-switch
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							|  |  | 
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							|  |  | 
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							|  |  | ## TrackPoint Needs Reset Circuit (PS/2 Mouse Support)
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							|  |  | Without reset circuit you will have inconsistent result due to improper initialize of the hardware. See circuit schematic of TPM754.
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							|  |  | 
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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
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							|  |  | 
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							|  |  | 
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							|  |  | ## Can't Read Column of Matrix Beyond 16
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							|  |  | Use `1UL<<16` instead of `1<<16` in `read_cols()` in [matrix.h] when your columns goes beyond 16.
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							|  |  | 
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							|  |  | In C `1` means one of [int] type which is [16 bit] 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`.
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							|  |  | 
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							|  |  | http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279
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							|  |  | 
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							|  |  | 
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							|  |  | ## Bootloader Jump Doesn't Work
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							|  |  | Properly configure bootloader size in **Makefile**. With wrong section size bootloader won't probably start with **Magic command** and **Boot Magic**.
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							|  |  | ```
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							|  |  | # Size of Bootloaders in bytes:
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							|  |  | #   Atmel DFU loader(ATmega32U4)   4096
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							|  |  | #   Atmel DFU loader(AT90USB128)   8192
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							|  |  | #   LUFA bootloader(ATmega32U4)    4096
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							|  |  | #   Arduino Caterina(ATmega32U4)   4096
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							|  |  | #   USBaspLoader(ATmega***)        2048
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							|  |  | #   Teensy   halfKay(ATmega32U4)   512
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							|  |  | #   Teensy++ halfKay(AT90USB128)   2048
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							|  |  | OPT_DEFS += -DBOOTLOADER_SIZE=4096
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							|  |  | ```
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							|  |  | AVR Boot section size are defined by setting **BOOTSZ** fuse in fact. Consult with your MCU datasheet.
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							|  |  | Note that **Word**(2 bytes) size and address are used in datasheet while TMK uses **Byte**.
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							|  |  | 
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							|  |  | AVR Boot section is located at end of Flash memory like the followings.
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							|  |  | ```
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							|  |  | byte     Atmel/LUFA(ATMega32u4)          byte     Atmel(AT90SUB1286)
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							|  |  | 0x0000   +---------------+               0x00000  +---------------+
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							|  |  |          |               |                        |               |
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							|  |  |          |               |                        |               |
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							|  |  |          |  Application  |                        |  Application  |
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							|  |  |          |               |                        |               |
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							|  |  |          =               =                        =               =
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							|  |  |          |               | 32KB-4KB               |               | 128KB-8KB
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							|  |  | 0x6000   +---------------+               0x1E000  +---------------+
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							|  |  |          |  Bootloader   | 4KB                    |  Bootloader   | 8KB
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							|  |  | 0x7FFF   +---------------+               0x1FFFF  +---------------+
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							|  |  | 
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							|  |  | 
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							|  |  | byte     Teensy(ATMega32u4)              byte     Teensy++(AT90SUB1286)
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							|  |  | 0x0000   +---------------+               0x00000  +---------------+
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							|  |  |          |               |                        |               |
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							|  |  |          |               |                        |               |
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							|  |  |          |  Application  |                        |  Application  |
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							|  |  |          |               |                        |               |
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							|  |  |          =               =                        =               =
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							|  |  |          |               | 32KB-512B              |               | 128KB-2KB
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							|  |  | 0x7E00   +---------------+               0x1FC00  +---------------+
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							|  |  |          |  Bootloader   | 512B                   |  Bootloader   | 2KB
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							|  |  | 0x7FFF   +---------------+               0x1FFFF  +---------------+
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							|  |  | ```
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							|  |  | 
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							|  |  | And see this discussion for further reference.
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							|  |  | https://github.com/tmk/tmk_keyboard/issues/179
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							|  |  | 
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							|  |  | If you are using a TeensyUSB, there is a [known bug](https://github.com/qmk/qmk_firmware/issues/164) in which the hardware reset button prevents the RESET key from working. Unplugging the keyboard and plugging it back in should resolve the problem.
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							|  |  | 
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							|  |  | ## Special Extra Key Doesn't Work (System, Audio Control Keys)
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							|  |  | You need to define `EXTRAKEY_ENABLE` in `rules.mk` to use them in QMK.
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							|  |  | 
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							|  |  | ```
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							|  |  | EXTRAKEY_ENABLE = yes          # Audio control and System control
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							|  |  | ```
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							|  |  | 
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							|  |  | ## Wakeup from Sleep Doesn't Work
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							|  |  | 
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							|  |  | In Windows check `Allow this device to wake the computer` setting in Power **Management property** tab of **Device Manager**. Also check BIOS setting.
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							|  |  | 
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							|  |  | Pressing any key during sleep should wake host.
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							|  |  | 
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							|  |  | ## Using Arduino?
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							|  |  | 
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							|  |  | **Note that Arduino pin naming is different from actual chip.** For example, Arduino pin `D0` is not `PD0`. Check circuit with its schematics yourself.
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							|  |  | 
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							|  |  | - http://arduino.cc/en/uploads/Main/arduino-leonardo-schematic_3b.pdf
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							|  |  | - http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
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							|  |  | 
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							|  |  | Arduino Leonardo and micro have **ATMega32U4** and can be used for TMK, though Arduino bootloader may be a problem.
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							|  |  | 
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							|  |  | 
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							|  |  | ## Using PF4-7 Pins of USB AVR?
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							|  |  | 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 affected with this.
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							|  |  | 
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							|  |  | If you are using Teensy this isn't needed. Teensy is shipped with JTAGEN fuse bit unprogrammed to disable the function.
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							|  |  | 
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							|  |  | See this code.
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							|  |  | ```
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							|  |  |     // JTAG disable for PORT F. write JTD bit twice within four cycles.
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							|  |  |     MCUCR |= (1<<JTD);
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							|  |  |     MCUCR |= (1<<JTD);
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							|  |  | ```
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							|  |  | https://github.com/tmk/tmk_keyboard/blob/master/keyboard/hbkb/matrix.c#L67
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							|  |  | 
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							|  |  | And read **26.5.1 MCU Control Register – MCUCR** of ATMega32U4 datasheet.
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							|  |  | 
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							|  |  | 
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							|  |  | ## Adding LED Indicators of Lock Keys
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							|  |  | You need your own LED indicators for CapsLock, ScrollLock and NumLock? See this post.
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							|  |  | 
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							|  |  | http://deskthority.net/workshop-f7/tmk-keyboard-firmware-collection-t4478-120.html#p191560
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							|  |  | 
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							|  |  | ## Program Arduino Micro/Leonardo
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							|  |  | Push reset button and then run command like this within 8 seconds.
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							|  |  | 
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							|  |  | ```
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							|  |  | avrdude -patmega32u4 -cavr109 -b57600 -Uflash:w:adb_usb.hex -P/dev/ttyACM0
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							|  |  | ```
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							|  |  | 
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							|  |  | Device name will vary depending on your system.
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							|  |  | 
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							|  |  | http://arduino.cc/en/Main/ArduinoBoardMicro
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							|  |  | https://geekhack.org/index.php?topic=14290.msg1563867#msg1563867
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							|  |  | 
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							|  |  | 
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							|  |  | ## USB 3 Compatibility
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							|  |  | I heard some people have a problem with USB 3 port, try USB 2 port.
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							|  |  | 
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							|  |  | 
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							|  |  | ## Mac Compatibility
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							|  |  | ### OS X 10.11 and Hub
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							|  |  | https://geekhack.org/index.php?topic=14290.msg1884034#msg1884034
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							|  |  | 
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							|  |  | 
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							|  |  | ## Problem on BIOS (UEFI)/Resume (Sleep & Wake)/Power Cycles
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							|  |  | Some people reported their keyboard stops working on BIOS and/or after resume(power cycles).
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							|  |  | 
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							|  |  | 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.
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							|  |  | 
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							|  |  | https://github.com/tmk/tmk_keyboard/issues/266
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							|  |  | https://geekhack.org/index.php?topic=41989.msg1967778#msg1967778
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							|  |  | 
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							|  |  | 
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							|  |  | 
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							|  |  | ## FLIP Doesn't Work
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							|  |  | ### `AtLibUsbDfu.dll` Not Found
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							|  |  | Remove current driver and reinstall one FLIP provides from DeviceManager.
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							|  |  | http://imgur.com/a/bnwzy
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