avr/base/include/base.h

#ifndef __BASE_H__
#define __BASE_H__

typedef struct IO_PIN {
    volatile uint8_t *port;
    uint8_t pin;
} io_pin_t;

inline void set_pin(io_pin_t *pin) {
    *(pin->port) |= 1 << pin->pin;
}

inline void clear_pin(io_pin_t *pin) {
    *(pin->port) &= 0xff ^ (1 << pin->pin);
}

typedef struct RNG {
    uint8_t mod;
    int8_t a;
    int8_t c;
    uint8_t seed;
} rng_t;

rng_t rng_new(uint8_t seed);

uint8_t rng_sample(rng_t *state);

#endif