91 lines
4.8 KiB
Markdown
91 lines
4.8 KiB
Markdown
# Frequently Asked Build Questions
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This page covers questions about building QMK. If you haven't yet done so, you should read the [Build Environment Setup](getting_started_build_tools.md) and [Make Instructions](getting_started_make_guide.md) guides.
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## Can't Program on Linux
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You will need proper permissions to operate a device. For Linux users, see the instructions regarding `udev` rules, below. If you have issues with `udev`, a work-around is to use the `sudo` command. If you are not familiar with this command, check its manual with `man sudo` or [see this webpage](https://linux.die.net/man/8/sudo).
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An example of using `sudo`, when your controller is ATMega32u4:
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$ sudo dfu-programmer atmega32u4 erase --force
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$ sudo dfu-programmer atmega32u4 flash your.hex
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$ sudo dfu-programmer atmega32u4 reset
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or just:
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$ sudo make <keyboard>:<keymap>:dfu
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Note that running `make` with `sudo` is generally *not* a good idea, and you should use one of the former methods, if possible.
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## Linux `udev` Rules
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On Linux, you'll need proper privileges to access the MCU. You can either use
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`sudo` when flashing firmware, or place these files in `/etc/udev/rules.d/`.
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**/etc/udev/rules.d/50-atmel-dfu.rules:**
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```
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# Atmel ATMega32U4
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SUBSYSTEMS=="usb", ATTRS{idVendor}=="03eb", ATTRS{idProduct}=="2ff4", MODE:="0666"
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# Atmel USBKEY AT90USB1287
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SUBSYSTEMS=="usb", ATTRS{idVendor}=="03eb", ATTRS{idProduct}=="2ffb", MODE:="0666"
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# Atmel ATMega32U2
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SUBSYSTEMS=="usb", ATTRS{idVendor}=="03eb", ATTRS{idProduct}=="2ff0", MODE:="0666"
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```
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**/etc/udev/rules.d/52-tmk-keyboard.rules:**
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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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## WINAVR is Obsolete
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It is no longer recommended and may cause some problem.
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See [TMK Issue #99](https://github.com/tmk/tmk_keyboard/issues/99).
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## USB VID and PID
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You can use any ID you want with editing `config.h`. Using any presumably unused ID will be no problem in fact except for very low chance of collision with other product.
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Most boards in QMK use `0xFEED` as the vendor ID. You should look through other keyboards to make sure you pick a unique Product ID.
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Also see this.
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https://github.com/tmk/tmk_keyboard/issues/150
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You can buy a really unique VID:PID here. I don't think you need this for personal use.
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- http://www.obdev.at/products/vusb/license.html
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- http://www.mcselec.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=92&option=com_phpshop&Itemid=1
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## Cortex: `cstddef: No such file or directory`
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GCC 4.8 of Ubuntu 14.04 had this problem and had to update to 4.9 with this PPA.
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https://launchpad.net/~terry.guo/+archive/ubuntu/gcc-arm-embedded
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https://github.com/tmk/tmk_keyboard/issues/212
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https://github.com/tmk/tmk_keyboard/wiki/mbed-cortex-porting#compile-error-cstddef
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https://developer.mbed.org/forum/mbed/topic/5205/
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## `clock_prescale_set` and `clock_div_1` Not Available
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Your toolchain is too old to support the MCU. For example WinAVR 20100110 doesn't support ATMega32u2.
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```
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Compiling C: ../../tmk_core/protocol/lufa/lufa.c
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avr-gcc -c -mmcu=atmega32u2 -gdwarf-2 -DF_CPU=16000000UL -DINTERRUPT_CONTROL_ENDPOINT -DBOOTLOADER_SIZE=4096 -DF_USB=16000000UL -DARCH=ARCH_AVR8 -DUSB_DEVICE_ONLY -DUSE_FLASH_DESCRIPTORS -DUSE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)" -DFIXED_CONTROL_ENDPOINT_SIZE=8 -DFIXED_NUM_CONFIGURATIONS=1 -DPROTOCOL_LUFA -DEXTRAKEY_ENABLE -DCONSOLE_ENABLE -DCOMMAND_ENABLE -DVERSION=unknown -Os -funsigned-char -funsigned-bitfields -ffunction-sections -fdata-sections -fno-inline-small-functions -fpack-struct -fshort-enums -fno-strict-aliasing -Wall -Wstrict-prototypes -Wa,-adhlns=obj_alps64/protocol/lufa/lufa.lst -I. -I../../tmk_core -I../../tmk_core/protocol/lufa -I../../tmk_core/protocol/lufa/LUFA-git -I../../tmk_core/common -std=gnu99 -include config.h -MMD -MP -MF .dep/obj_alps64_protocol_lufa_lufa.o.d ../../tmk_core/protocol/lufa/lufa.c -o obj_alps64/protocol/lufa/lufa.o
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../../tmk_core/protocol/lufa/lufa.c: In function 'setup_mcu':
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../../tmk_core/protocol/lufa/lufa.c:575: warning: implicit declaration of function 'clock_prescale_set'
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../../tmk_core/protocol/lufa/lufa.c:575: error: 'clock_div_1' undeclared (first use in this function)
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../../tmk_core/protocol/lufa/lufa.c:575: error: (Each undeclared identifier is reported only once
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../../tmk_core/protocol/lufa/lufa.c:575: error: for each function it appears in.)
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make: *** [obj_alps64/protocol/lufa/lufa.o] Error 1
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```
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## BOOTLOADER_SIZE for AVR
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Note that Teensy2.0++ bootloader size is 2048byte. Some Makefiles may have wrong comment.
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```
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# Boot Section Size in *bytes*
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# Teensy halfKay 512
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# Teensy++ halfKay 2048
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# Atmel DFU loader 4096 (TMK Alt Controller)
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# LUFA bootloader 4096
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# USBaspLoader 2048
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OPT_DEFS += -DBOOTLOADER_SIZE=2048
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```
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