something.c

enum {
    PIN_INPUT,
    PIN_INPUT_HIGH,
    PIN_INPUT_LOW,
    PIN_OUTPUT,
    PIN_OUTPUT_HIGH,
    PIN_OUTPUT_LOW
}

#ifdef __AVR__
    #define pin_t uint8_t
    #define writePinHigh(pin) _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF)
    #define writePinLow(pin) _SFR_IO8((pin >> 4) + 2) &= ~ _BV(pin & 0xF)

    #define setPinModeInput(pin) _SFR_IO8((pin >> 4) + 1) &= ~ _BV(pin & 0xF)
    #define setPinModeInputHigh(pin) ({\
            _SFR_IO8((pin >> 4) + 1) &= ~ _BV(pin & 0xF);\
            _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF);\
            })
    #define setPinModeInputLow(pin) ({\
            _SFR_IO8((pin >> 4) + 1) &= ~ _BV(pin & 0xF);\
            _SFR_IO8((pin >> 4) + 2) &= ~ _BV(pin & 0xF);\
            })

    #define setPinModeOutput(pin) _SFR_IO8((pin >> 4) + 1) |= _BV(pin & 0xF)
    #define setPinModeInputHigh(pin) ({\
            _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF);\
            _SFR_IO8((pin >> 4) + 2) |=  _BV(pin & 0xF);\
            })
    #define setPinModeInputLow(pin) ({\
            _SFR_IO8((pin >> 4) + 1) |=  _BV(pin & 0xF);\
            _SFR_IO8((pin >> 4) + 2) &= ~ _BV(pin & 0xF);\
            })

    #define readPin(pin) (_SFR_IO8(pin >> 4) & _BV(pin & 0xF))

    static inline void writePin(pin_t pin, bool direction) {
        if (direction) {
            writePinHigh();
        } else {
            writePinLow();
        }
    }
    static inline void setPinMode(pin_t pin, uint8_t mode) {
        switch(mode) {
            case PIN_INPUT: setPinModeInput(); break;
            case PIN_INPUT_HIGH: setPinModeInputHigh(); break;
            case PIN_INPUT_LOW: setPinModeInputLow(); break;
            case PIN_OUTPUT: setPinModeOutput(); break;
            case PIN_OUTPUT_HIGH: setPinModeOutputHigh(); break;
            case PIN_OUTPUT_LOW: setPinModeOutputLow(); break;
        }
    }
#elif defined(PROTOCOL_CHIBIOS)
    #define pin_t ioline_t
    #define PIN_INPUT       PAL_MODE_INPUT
    #define PIN_INPUT_HIGH  PAL_MODE_INPUT_PULLUP
    #define PIN_INPUT_LOW   PAL_MODE_INPUT_PULLDOWN
    #define PIN_OUTPUT_HIGH PAL_MODE_OUTPUT_PUSHPULL
    #define PIN_OUTPUT_LOW  0b10

    #define setPinModeInput(pin) palSetLineMode(pin, PAL_MODE_INPUT)
    #define setPinModeInputHigh(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLUP)
    #define setPinModeInputLow(pin) palSetLineMode(pin, PAL_MODE_INPUT_PULLDOWN)
    #define setPinModeOutput(pin) palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL)
    #define setPinModeOutputHigh(pin) palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL); palWriteLine(pin, PAL_HIGH)
    #define setPinModeOutputLow(pin) palSetLineMode(pin, PAL_MODE_OUTPUT_PUSHPULL); palWriteLine(pin, PAL_LOW)
    #define readPin(pin) palReadLine(pin)
    #define writePin(pin, direction) palWriteLine(pin, direction)
    #define writePinHigh(pin) palWriteLine(pin, PAL_HIGH)
    #define writePinLow(pin) palWriteLine(pin, PAL_LOW)
    #define setPinMode(pin, mode) palSetLineMode(pin, mode)
#endif