[Keyboard] Add Keyboardio Model 100 - #26397
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Bring the personal branch's shared port files in line with the upstream PR (qmk#26397) after review round 1: - matrix.c: convert to lite custom matrix (matrix_init_custom / matrix_scan_custom); core owns the matrix array, debounce and print. - default keymap: drop the numpad-colour indicator to keep it minimal. - keyboard.json / rules.mk: stop selecting `bootloader: stm32duino` by name (which lets platforms/chibios/bootloader.mk hard-override DFU_ARGS back to the Maple 1EAF:0003 default, clobbering ours). Declare the board and set the bootloader flags manually so our 3496:0005 DAPBoot DFU identifiers survive. The dshields personal keymap is unchanged and still builds/links.
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The Model 100 shares the Model 01's split hardware design: both halves are ATtiny key scanners the main MCU talks to over I2C, using the same wire protocol, scanner addresses, and 64-LED layout. The custom matrix and LED drivers are therefore adapted from the Model 01. The main MCU differs: the Model 01's ATmega32U4 (AVR) is replaced by a GD32F303CG (ARM Cortex-M4). This is built as an STM32F103 with the high-density board variant, following the mlego/m65/rev2 precedent, so no dedicated GD32 ChibiOS port is required. Scanner power moves to B9 (open-drain), power-sense to B14/B15, and the scanners hang off I2C1 (B6/B7). Pin assignments and the 8 MHz HXTAL / 48 MHz USB clock were cross-checked against the Kaleidoscope Model 100 hardware plugin and the ArduinoCore-GD32-Keyboardio keyboardio_model_100 variant.
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The Model 100 shares the Model 01's split hardware design: both halves are ATtiny key scanners the main MCU talks to over I2C, using the same wire protocol, scanner addresses, and 64-LED layout. The custom matrix and LED drivers are therefore adapted from the Model 01.
The main MCU differs: the Model 01's ATmega32U4 (AVR) is replaced by a GD32F303CG (ARM Cortex-M4). This is built as an STM32F103 with the high-density board variant, following the mlego/m65/rev2 precedent, so no dedicated GD32 ChibiOS port is required. Scanner power moves to B9 (open-drain), power-sense to B14/B15, and the scanners hang off I2C1 (B6/B7).
Pin assignments and the 8 MHz HXTAL / 48 MHz USB clock were cross-checked against the Kaleidoscope Model 100 hardware plugin and the ArduinoCore-GD32-Keyboardio keyboardio_model_100 variant.
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