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1# Frequently Asked Questions 1# Frequently Asked Questions
2 2
3## General 3* [General](faq_general.md)
4 4* [Building or Compiling QMK](faq_build.md)
5### What is QMK? 5* [Debugging and Troubleshooting QMK](faq_debug.md)
6 6* [Keymap](faq_keymap.md)
7[QMK](https://github.com/qmk), short for Quantum Mechanical Keyboard, is a group of people building tools for custom keyboards. We started with the [QMK firmware](https://github.com/qmk/qmk_firmware), a heavily modified fork of [TMK](https://github.com/tmk/tmk_keyboard).
8
9### Why the name Quantum?
10
11<!-- FIXME -->
12
13### What Differences Are There Between QMK and TMK?
14
15TMK was originally designed and implemented by [Jun Wako](https://github.com/tmk). QMK started as [Jack Humbert's](https://github.com/jackhumbert) fork of TMK for the Planck. After a while Jack's fork had diverged quite a bit from TMK, and in 2015 Jack decided to rename his fork to QMK.
16
17From a technical standpoint QMK builds upon TMK by adding several new features. Most notably QMK has expanded the number of available keycodes and uses these to implement advanced features like `S()`, `LCTL()`, and `MO()`. You can see a complete list of these keycodes in [Quantum Keycodes](quantum_keycodes.html).
18
19From a project and community management standpoint TMK maintains all the officially supported keyboards by himself, with a bit of community support. Separate community maintained forks exist or can be created for other keyboards. Only a few keymaps are provided by default, so users typically don't share keymaps with each other. QMK encourages sharing of both keyboards and keymaps through a centrally managed repository, accepting all pull requests that follows the quality standards. These are mostly community maintained, but the QMK team also helps when necessary.
20
21Both approaches have their merits and their drawbacks, and code flows freely between TMK and QMK when it makes sense.
22
23# Building
24
25## Windows
26
27### I'm on Windows Vista, 7, or 8, how do I setup my build environment?
28
29Follow the build instructions to [install MHV AVR Tools](https://docs.qmk.fm/build_environment_setup.html#windows-vista-and-later).
30
31### I'm on Windows 10 without the Creators Update. Do I have to install it?
32
33No, but if you don't install the creators update you will not be able to build and flash with a single command. You will be able to build but to flash you will have to use a separate program, such as [QMK Flasher](https://github.com/qmk/qmk_flasher).
34
35# Troubleshooting
36
37## Debug Console
38### hid_listen can't recognize device
39When debug console of your device is not ready you will see like this:
40
41```
42Waiting for device:.........
43```
44
45once the device is pluged in then *hid_listen* finds it you will get this message:
46
47```
48Waiting for new device:.........................
49Listening:
50```
51
52If you can't get this 'Listening:' message try building with `CONSOLE_ENABLE=yes` in [Makefile]
53
54You may need privilege to access the device on OS like Linux.
55- try `sudo hid_listen`
56
57### Can't get message on console
58Check:
59- *hid_listen* finds your device. See above.
60- Enable debug with pressing **Magic**+d. See [Magic Commands](https://github.com/tmk/tmk_keyboard#magic-commands).
61- set `debug_enable=true` usually in `matrix_init()` in **matrix.c**.
62- try using 'print' function instead of debug print. See **common/print.h**.
63- disconnect other devices with console function. See [Issue #97](https://github.com/tmk/tmk_keyboard/issues/97).
64
65### Linux or UNIX like system requires Super User privilege
66Just use 'sudo' to execute *hid_listen* with privilege.
67```
68$ sudo hid_listen
69```
70
71Or add an *udev rule* for TMK devices with placing a file in rules directory. The directory may vary on each system.
72
73File: /etc/udev/rules.d/52-tmk-keyboard.rules(in case of Ubuntu)
74```
75# tmk keyboard products https://github.com/tmk/tmk_keyboard
76SUBSYSTEMS=="usb", ATTRS{idVendor}=="feed", MODE:="0666"
77```
78
79## Software Issues
80
81### NKRO Doesn't work
82First you have to compile frimware with this build option `NKRO_ENABLE` in **Makefile**.
83
84Try `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.
85
86If 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.
87
88https://github.com/tmk/tmk_keyboard#boot-magic-configuration---virtual-dip-switch
89
90### Can't read column of matrix beyond 16
91Use `1UL<<16` instead of `1<<16` in `read_cols()` in [matrix.h] when your columns goes beyond 16.
92
93In 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`.
94
95http://deskthority.net/workshop-f7/rebuilding-and-redesigning-a-classic-thinkpad-keyboard-t6181-60.html#p146279
96
97
98### Bootloader jump doesn't work
99Properly configure bootloader size in **Makefile**. With wrong section size bootloader won't probably start with **Magic command** and **Boot Magic**.
100```
101# Size of Bootloaders in bytes:
102# Atmel DFU loader(ATmega32U4) 4096
103# Atmel DFU loader(AT90USB128) 8192
104# LUFA bootloader(ATmega32U4) 4096
105# Arduino Caterina(ATmega32U4) 4096
106# USBaspLoader(ATmega***) 2048
107# Teensy halfKay(ATmega32U4) 512
108# Teensy++ halfKay(AT90USB128) 2048
109OPT_DEFS += -DBOOTLOADER_SIZE=4096
110```
111AVR Boot section size are defined by setting **BOOTSZ** fuse in fact. Consult with your MCU datasheet.
112Note that **Word**(2 bytes) size and address are used in datasheet while TMK uses **Byte**.
113
114AVR Boot section is located at end of Flash memory like the followings.
115```
116byte Atmel/LUFA(ATMega32u4) byte Atmel(AT90SUB1286)
1170x0000 +---------------+ 0x00000 +---------------+
118 | | | |
119 | | | |
120 | Application | | Application |
121 | | | |
122 = = = =
123 | | 32KB-4KB | | 128KB-8KB
1240x6000 +---------------+ 0x1E000 +---------------+
125 | Bootloader | 4KB | Bootloader | 8KB
1260x7FFF +---------------+ 0x1FFFF +---------------+
127
128
129byte Teensy(ATMega32u4) byte Teensy++(AT90SUB1286)
1300x0000 +---------------+ 0x00000 +---------------+
131 | | | |
132 | | | |
133 | Application | | Application |
134 | | | |
135 = = = =
136 | | 32KB-512B | | 128KB-2KB
1370x7E00 +---------------+ 0x1FC00 +---------------+
138 | Bootloader | 512B | Bootloader | 2KB
1390x7FFF +---------------+ 0x1FFFF +---------------+
140```
141
142And see this discussion for further reference.
143https://github.com/tmk/tmk_keyboard/issues/179
144
145
146### Special Extra key doesn't work(System, Audio control keys)
147You need to define `EXTRAKEY_ENABLE` in `rules.mk` to use them in QMK.
148
149```
150EXTRAKEY_ENABLE = yes # Audio control and System control
151```
152
153### Wakeup from sleep doesn't work
154
155In Windows check `Allow this device to wake the computer` setting in Power **Management property** tab of **Device Manager**. Also check BIOS setting.
156
157Pressing any key during sleep should wake host.
158
159## Hardware Issues
160
161### TrackPoint needs reset circuit(PS/2 mouse support)
162Without reset circuit you will have inconsistent reuslt due to improper initialize of the hardware. See circuit schematic of TPM754.
163
164- http://geekhack.org/index.php?topic=50176.msg1127447#msg1127447
165- http://www.mikrocontroller.net/attachment/52583/tpm754.pdf
166
167### Using Arduino?
168
169**Note that Arduino pin naming is different from actual chip.** For example, Arduino pin `D0` is not `PD0`. Check circuit with its schematics yourself.
170
171- http://arduino.cc/en/uploads/Main/arduino-leonardo-schematic_3b.pdf
172- http://arduino.cc/en/uploads/Main/arduino-micro-schematic.pdf
173
174Arduino leonardo and micro have **ATMega32U4** and can be used for TMK, though Arduino bootloader may be a problem.
175
176### Using PF4-7 pins of USB AVR?
177You 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.
178
179If you are using Teensy this isn't needed. Teensy is shipped with JTAGEN fuse bit unprogrammed to disable the function.
180
181See this code.
182```
183 // JTAG disable for PORT F. write JTD bit twice within four cycles.
184 MCUCR |= (1<<JTD);
185 MCUCR |= (1<<JTD);
186```
187https://github.com/tmk/tmk_keyboard/blob/master/keyboard/hbkb/matrix.c#L67
188
189And read **26.5.1 MCU Control Register – MCUCR** of ATMega32U4 datasheet.
190
191
192### Program Arduino Micro/Leonardo
193Push reset button and then run command like this within 8 seconds.
194
195```
196avrdude -patmega32u4 -cavr109 -b57600 -Uflash:w:adb_usb.hex -P/dev/ttyACM0
197```
198
199Device name will vary depending on your system.
200
201http://arduino.cc/en/Main/ArduinoBoardMicro
202https://geekhack.org/index.php?topic=14290.msg1563867#msg1563867
203
204### Problem on BIOS(UEFI)/Resume(Sleep&Wake)/Power cycles
205Some people reported their keyboard stops working on BIOS and/or after resume(power cycles).
206
207As 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.
208
209https://github.com/tmk/tmk_keyboard/issues/266
210https://geekhack.org/index.php?topic=41989.msg1967778#msg1967778
211
212## Flashing Problems
213
214### Can't use dfu-programmer or QMK Flasher to flash on Windows
215
216Windows requires a driver to support the keyboard in DFU mode. You can use [QMK Driver Installer](https://github.com/qmk/qmk_driver_installer/releases) to install the necessary drivers.