adinisom

  typedef struct blinky_state {
    size_t pc;
    uint64_t timer;
    ... variables that need to live across YIELDs ...
  } blinky_state_t;
  
  blinky_state_t blinky_state;
  
  #define YIELD() s->pc = __LINE__; return; case __LINE__:;
  void blinky(void) {
    blinky_state_t *s = &blinky_state;
    uint64_t now = get_ticks();
    
    switch(s->pc) {
      while(true) {
        turn_on_LED();
        s->timer = now;
        while( now - s->timer < 1000 ) { YIELD(); }
        
        turn_off_LED();
        s->timer = now;
        while( now - s->timer < 1000 ) { YIELD(); }
      }
    }
  }
  #undef YIELD