26 lines
1.5 KiB
Markdown
26 lines
1.5 KiB
Markdown
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## USB stack implementation using ChibiOS
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### Notes
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- To use, unpack or symlink ChibiOS here, to `chibios`.
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- For gcc options, inspect `chibios.mk`. For instance, I enabled `-Wno-missing-field-initializers`, because TMK common bits generated a lot of hits on that.
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Also pay attention to `-O0` (enabled for debugging); for deployment use `-O2`.
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- USB string descriptors are a mess. I did not find a way to cleanly generate the right structures from actual strings, so the definitions in individual keyboards' `config.h` are ugly as heck.
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- There are some random constants left so far, e.g. 5ms sleep between calling `keyboard_task` in `main.c`. There should be no such in `usb_main.c`. Everything is based on timers/interrupts/kernel scheduling (well except `keyboard_task`), so no periodically called things (again, except `keyboard_task`, which is just how TMK is designed).
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- 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.
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- The USB stack works pretty completely; however there are bits of other TMK stuff that are not done yet:
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### Immediate todo
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- suspend / sleep led
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### Missing / not working (TMK vs ChibiOS bits)
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- eeprom / bootmagic (will be chip dependent)
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- bootloader jump (chip dependent)
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### Tried with
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- ChibiOS 3.0.1 and ST F072RB DISCOVERY board.
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- Need to test on other STM32 chips (F3, F4) to make it as much chip-independent as possible.
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