//
// fa_led_array Charlieplex FabKit LED array
// Blair Evans
//
// adapted from hello.array.44.c
//
// Charlieplex LED array hello-world
//
// Neil Gershenfeld
// 11/13/10
//
// (c) Massachusetts Institute of Technology 2010
// Permission granted for experimental and personal use;
// license for commercial sale available from MIT.
//


const int led_delay = 1000; // LED delay of 1 ms

/* SV2 */
const byte A = 3; // row 1
const byte B = 4; // row 2
const byte C = 5; // row 3
const byte D = 6; // row 4
const byte E = 7; // row 5

/* SV1
const byte A = 9; // row 1
const byte B = 10; // row 2
const byte C = 11; // row 3
const byte D = 12; // row 4
const byte E = 13; // row 5
*/

void flash(uint8_t from, uint8_t to, uint8_t delay) {
   //
   // source from, sink to, flash
   //
   static int i;
   digitalWrite(from,HIGH); //set(led_port,from);
   digitalWrite(to,LOW); //clear(led_port,to);
   pinMode(from,OUTPUT); //output(led_direction,from);
   pinMode(to,OUTPUT); //output(led_direction,to);
   for (i = 0; i < delay; ++i)
       delayMicroseconds(led_delay);
   pinMode(from,INPUT); //input(led_direction,from);
   pinMode(to,INPUT); // input(led_direction,to);
   }

void led_cycle(int number, int delay) {
   //
   // cycle through LEDs
   //
   int i;
   for (i = 0; i < number; ++i) {
      flash(B,A,delay);
      flash(C,A,delay);
      flash(D,A,delay);
      flash(E,A,delay);
      flash(A,B,delay);
      flash(C,B,delay);
      flash(D,B,delay);
      flash(E,B,delay);
      flash(A,C,delay);
      flash(B,C,delay);
      flash(D,C,delay);
      flash(E,C,delay);
      flash(A,D,delay);
      flash(B,D,delay);
      flash(C,D,delay);
      flash(E,D,delay);
      flash(A,E,delay);
      flash(B,E,delay);
      flash(C,E,delay);
      flash(D,E,delay);
      }
   }
   
void setup() {
   pinMode(A,INPUT);
   pinMode(B,INPUT);
   pinMode(C,INPUT);
   pinMode(D,INPUT);
   pinMode(E,INPUT);
   }

void loop() {
      led_cycle(1,100);
      led_cycle(3,20);
      led_cycle(100,1);
   }