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Rev 2

keyboards/kprepublic/cstc40/rev2/readme.md

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Rev 2

A 40% hotswap ortholinear RGB keyboard from KP Republic.

  • Revision 2: "single pcb"
  • Keyboard Maintainer: Var
  • Hardware Supported: CSTC40 rev2
  • STM32F402RCT6 MCU with IS31FL3733 LED driver and using stm32-dfu bootloader. Integrated USB connection.
  • Hardware Availability: kprepublic.com

Make example for this keyboard (after setting up your build environment):

make kprepublic/cstc40/rev2:default

Flashing example for this keyboard:

make kprepublic/cstc40/rev2:default:flash

See the build environment setup and the make instructions for more information. Brand new to QMK? Start with our Complete Newbs Guide.

Bootloader

Enter the bootloader in 3 ways:

  • Bootmagic reset: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
  • Physical reset button: Briefly press the button on the back of the PCB - some may have pads you must short instead
  • Keycode in layout: Press the key mapped to QK_BOOT if it is available

The rev 2 uses pin A10 in the key matrix, which apparently is a design flaw that may prevent the bootloader from entering the proper mode for DFU flashing - https://docs.qmk.fm/#/platformdev_blackpill_f4x1?id=pins-to-be-avoided. There is a simple workaround that works most of the time - press the pin key (generally the letter R) during the boot.