forked from forks/qmk_firmware
39bd760faf
* Unify multiple HID interfaces into one This reduces the number of USB endpoints required, which frees them up for other things. NKRO and EXTRAKEY always use the shared endpoint. By default, MOUSEKEY also uses it. This means it won't work as a Boot Procotol mouse in some BIOSes, etc. If you really think your keyboard needs to work as a mouse in your BIOS, set MOUSE_SHARED_EP = no in your rules.mk. By default, the core keyboard does not use the shared endpoint, as not all BIOSes are standards compliant and that's one place you don't want to find out your keyboard doesn't work.. If you are really confident, you can set KEYBOARD_SHARED_EP = yes to use the shared endpoint here too. * unify endpoints: ChibiOS protocol implementation * fixup: missing #ifdef EXTRAKEY_ENABLEs broke build on AVR with EXTRAKEY disabled * endpoints: restore error when too many endpoints required * lufa: wait up to 10ms to send keyboard input This avoids packets being dropped when two reports are sent in quick succession (eg. releasing a dual role key). * endpoints: fix compile on ARM_ATSAM * endpoint: ARM_ATSAM fixes No longer use wrong or unexpected endpoint IDs * endpoints: accommodate VUSB protocol V-USB has its own, understandably simple ideas about the report formats. It already blasts the mouse and extrakeys through one endpoint with report IDs. We just stay out of its way. * endpoints: document new endpoint configuration options * endpoints: respect keyboard_report->mods in NKRO The caller(s) of host_keyboard_send expect to be able to just drop modifiers in the mods field and not worry about whether NKRO is in use. This is a good thing. So we just shift it over if needs be. * endpoints: report.c: update for new keyboard_report format |
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| .. | ||
| lufa_utils/LUFA/Drivers/USB | ||
| main.c | ||
| README.md | ||
| usb_driver.c | ||
| usb_driver.h | ||
| usb_main.c | ||
| usb_main.h | ||
TMK running on top of ChibiOS
This code can be used to run TMK keyboard logic on top of ChibiOS, meaning that you can run TMK on whatever ChibiOS supports. The notable examples are ARM-based Teensies (3.x and LC) and on the boards with STM32 MCUs.
Usage
- To use, get a zip of chibios and unpack/rename it to
tmk_core/tool/chibios/chibios; or you can just clone the repo there. For Freescale/NXP Kinetis support (meaning ARM Teensies and the Infinity keyboard), you'll also need a zip of chibios-contrib, unpacked/renamed totmk_core/tool/chibios/chibios-contrib. Likewise, for git-savvy people, just clone the repo there. - Note: the abovementioned directories are the defaults. You can have the two chibios repositories wherever you want, just define their location in
CHIBIOSandCHIBIOS_CONTRIBvariables in yourMakefile. - You will also need to install an ARM toolchain, for instance from here. On linux, this is usually also present as a package for your distribution (as
gcc-armor something similar). On OS X, you can use homebrew with an appropriate tap.
Notes
- Some comments about ChibiOS syntax and the most commonly used GPIO functions are, as well as an example for ARM Teensies, is here.
- For gcc options, inspect
tmk_core/tool/chibios/chibios.mk. For instance, I enabled-Wno-missing-field-initializers, because TMK common bits generated a lot of warnings on that. - For debugging, it is sometimes useful disable gcc optimisations, you can do that by adding
-O0toOPT_DEFSin yourMakefile. - USB string descriptors are messy. I did not find a way to cleanly generate the right structures from actual strings, so the definitions in individual keyboards'
config.hare ugly as heck. - It is easy to add some code for testing (e.g. blink LED, do stuff on button press, etc...) - just create another thread in
main.c, it will run independently of the keyboard business. - Jumping to (the built-in) bootloaders on STM32 works, but it is not entirely pleasant, since it is very much MCU dependent. So, one needs to dig out the right address to jump to, and either pass it to the compiler in the
Makefile, or better, define it in<your_kb>/bootloader_defs.h. An additional startup code is also needed; the best way to deal with this is to define custom board files. (Example forthcoming.) In any case, there are no problems for Teensies.
Immediate todo
- power saving for suspend
Not tested, but possibly working
- backlight
Missing / not working (TMK vs ChibiOS bits)
- eeprom / bootmagic for STM32 (will be chip dependent; eeprom needs to be emulated in flash, which means less writes; wear-levelling?) There is a semi-official ST "driver" for eeprom, with wear-levelling, but I think it consumes a lot of RAM (like 2 pages, i.e. 1kB or so).
Tried with
- Infinity, WhiteFox keyboards
- all ARM-based Teensies
- some STM32-based boards (e.g. ST-F072RB-DISCOVERY board, STM32F042 breakout board, Maple Mini (STM32F103-based))
ChibiOS-supported MCUs
- Pretty much all STM32 chips.
- K20x and KL2x Freescale/NXP chips (i.e. Teensy 3.x/LC, mchck, FRDM-KL2{5,6}Z, FRDM-K20D50M), via the ChibiOS-Contrib repository.
- There is also support for AVR8, but the USB stack is not implemented for them yet (some news on that front recently though), and also the kernel itself takes about 1k of RAM. I think people managed to get ChibiOS running on atmega32[8p/u4] though.
- There is also support for Nordic NRF51822 (the chip in Adafruit's Bluefruit bluetooth-low-energy boards), but be aware that that chip does not have USB, and the BLE softdevice (i.e. Bluetooth) is not supported directly at the moment.
STM32-based keyboard design considerations
- STM32F0x2 chips can do crystal-less USB, but they still need a 3.3V voltage regulator.
- The BOOT0 pin should be tied to GND.
- For a hardware way of accessing the in-built DFU bootloader, in addition to the reset button, put another button between the BOOT0 pin and 3V3.
- There is a working example of a STM32F042-based keyboard: firmware here and hardware (kicad) here. You can check this example firmware for custom board files, and a more complicated matrix than just one key.