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{ "development_board": "blackpill_f411", "eeprom": { "driver": "spi" }, "matrix_pins": { "cols": ["B1", "B10", "B3", "B4", "B5"], "rows": ["A2", "B8", "A8", "B9"] }, "split": { "handedness": { "pin": "A3" }, "serial": { "driver": "usart", "pin": "A9" } }, "ws2812": { "driver": "pwm", "pin": "A1" } }