qmk_firmware/quantum/config_common.h

#ifndef CONFIG_DEFINITIONS_H
#define CONFIG_DEFINITIONS_H

/* diode directions */
#define COL2ROW 0
#define ROW2COL 1
/* I/O pins */
#ifndef F0
    #define B0 0x30
    #define B1 0x31
    #define B2 0x32
    #define B3 0x33
    #define B4 0x34
    #define B5 0x35
    #define B6 0x36
    #define B7 0x37
    #define C0 0x60
    #define C1 0x61
    #define C2 0x62
    #define C3 0x63
    #define C4 0x64
    #define C5 0x65
    #define C6 0x66
    #define C7 0x67
    #define D0 0x90
    #define D1 0x91
    #define D2 0x92
    #define D3 0x93
    #define D4 0x94
    #define D5 0x95
    #define D6 0x96
    #define D7 0x97
    #define E0 0xC0
    #define E1 0xC1
    #define E2 0xC2
    #define E3 0xC3
    #define E4 0xC4
    #define E5 0xC5
    #define E6 0xC6
    #define E7 0xC7
    #define F0 0xF0
    #define F1 0xF1
    #define F2 0xF2
    #define F3 0xF3
    #define F4 0xF4
    #define F5 0xF5
    #define F6 0xF6
    #define F7 0xF7
    #define A0 0x00
    #define A1 0x01
    #define A2 0x02
    #define A3 0x03
    #define A4 0x04
    #define A5 0x05
    #define A6 0x06
    #define A7 0x07
#endif

/* USART configuration */
#ifdef BLUETOOTH_ENABLE
#   ifdef __AVR_ATmega32U4__
#      define SERIAL_UART_BAUD 9600
#      define SERIAL_UART_DATA UDR1
#      define SERIAL_UART_UBRR (F_CPU / (16UL * SERIAL_UART_BAUD) - 1)
#      define SERIAL_UART_RXD_VECT USART1_RX_vect
#      define SERIAL_UART_TXD_READY (UCSR1A & _BV(UDRE1))
#      define SERIAL_UART_INIT() do { \
            /* baud rate */ \
            UBRR1L = SERIAL_UART_UBRR; \
            /* baud rate */ \
            UBRR1H = SERIAL_UART_UBRR >> 8; \
            /* enable TX */ \
            UCSR1B = _BV(TXEN1); \
            /* 8-bit data */ \
            UCSR1C = _BV(UCSZ11) | _BV(UCSZ10); \
            sei(); \
        } while(0)
#   else
#       error "USART configuration is needed."
#   endif
#endif

#endif