simple beat parser for arduino (based on string) for dual blinking led.

dualblink_arduino.c

#define RED 12
#define GREEN 13

struct blinking {
  int pin;
  int mode;
  int sleep; 
};

struct blinking b[256];

char *beat = " RRRRGRRRG.";

void
_set_beat(struct blinking *bp, char *beat, int s) {
 int i = 0;
 for(i=0; i<s; i++) {
   if (beat[i] == 'G') {
        _set(bp, i, RED, HIGH, 100);
   }
   if (beat[i] == 'g') {
        _set(bp, i, RED, LOW, 100);
   }
   if (beat[i] == 'R') {
        _set(bp, i, GREEN, HIGH, 100);
   }
   if (beat[i] == 'r') {
        _set(bp, i, GREEN, LOW, 100);
   }
   if (beat[i] == ' ') {
     _set(bp, i, RED, LOW, 100);
     _set(bp, i, GREEN, LOW, 100);
   }
   if (beat[i] == '.') {
     _set(bp, i, RED, HIGH, 100);
     _set(bp, i, GREEN, HIGH, 100);
   }
 } 
}

void
_set_mode(struct blinking *bp, int mode) {
   bp->mode = mode; 
}

void
_set_sleep(struct blinking *bp, int sleep) {
   bp->sleep = sleep;
}

void
_set(struct blinking *bp, int pos, int pin, int mode, int sleep) {
  bp[pos].pin = pin,
   _set_mode(&bp[pos], mode);
   _set_sleep(&bp[pos], sleep);
}

void
_run(struct blinking *bp, int pos) {
   digitalWrite(bp[pos].pin, bp[pos].mode);
   delay(bp[pos].sleep); 
}

void
_full_run(struct blinking *bp, int s) {
   int i = 0;
   for (i=0; i<s; i++) 
     _run(bp, i);
} 

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  _set_beat(b, beat, strlen(beat));
}

void loop() {
  _full_run(b, strlen(beat));
}