File content as of revision 5:6d8f9165021e:

#include "mbed.h"
#include <vector>
#define BUFFER_SIZE 16
#define NUMBER_OF_SLICES 90

//DigitalOut Pins
DigitalOut pushRegister(p23);
DigitalOut pushBit(p24);

DigitalOut dataArmOne(p15);
DigitalOut dataArmTwo(p16);
DigitalOut dataArmThree(p17);
DigitalOut dataArmFour(p18);
DigitalOut dataArmFive(p19);
DigitalOut dataArmSix(p20);
DigitalOut dataArmSeven(p21);
DigitalOut dataArmEight(p22);
DigitalOut led(LED1);

//Enable Interupt
InterruptIn hallSensor(p25);

//Set Up Timer and ticker
Timer rotationTime;
Ticker updateLeds;

//Declare global vars
double slice_time;
double rotate_time;
int current_slice;
char slice_data [NUMBER_OF_SLICES][16]; //[slice][specific led distance] (0 is closest) & with approppriate bit for each arm 
double firstTime;

Serial pc(USBTX, USBRX); // tx, rx
Serial bt(p9, p10);// tx, rx


void pushData (char bits [16]){
  for (int i = 8; i < 16; i ++){
    dataArmOne = bits [i] & 0x01;
    dataArmTwo = bits [i] & 0x02;
    dataArmThree = bits [i]& 0x04;
    dataArmFour = bits [i]& 0x08;
    dataArmFive = bits [i] & 0x10;
    dataArmSix = bits [i] & 0x20;
    dataArmSeven = bits [i] & 0x40;
    dataArmEight = bits [i] & 0x80;
    
    pushBit = 1;
    pushBit = 0;
  }
  for (int i = 7; i >= 0; i --){
    dataArmOne = bits [i] & 0x01;
    dataArmTwo = bits [i] & 0x02;
    dataArmThree = bits [i]& 0x04;
    dataArmFour = bits [i]& 0x08;
    dataArmFive = bits [i] & 0x10;
    dataArmSix = bits [i] & 0x20;
    dataArmSeven = bits [i] & 0x40;
    dataArmEight = bits [i] & 0x80;
    
    pushBit = 1;
    pushBit = 0;
    }
      
  pushRegister = 1;
  pushRegister = 0;
}


//periodic display interrupt
void nextLedPush(){
  if (current_slice < NUMBER_OF_SLICES){
    pushData(slice_data[current_slice]);
    current_slice ++;
  } else {
      updateLeds.detach();
  }
}

//Hall sensor interupt
void rotate_sense(){
  pc.printf("interupt");
  if (firstTime){
    rotationTime.reset();
    rotationTime.start();
    firstTime = 0;
    pc.printf("first time");
    led = !led;
    return;
  } else if(current_slice < NUMBER_OF_SLICES / 4){
      return;
      }
  pc.printf("seconod time \n");
  led = !led;
    rotate_time = rotationTime.read_us();
    rotationTime.reset();    
    rotationTime.start();
    
    slice_time = (double) rotate_time/NUMBER_OF_SLICES;
    current_slice = 0;
    updateLeds.attach_us(&nextLedPush, slice_time);
}


int main() {
  pc.printf("started");
  firstTime = 1;
  current_slice = 90;
    
    hallSensor.fall(&rotate_sense);
    for (int i = 0; i < 45; i ++){
        slice_data [i][0] = 0x01; // bit 0 is high on arm 0
        slice_data [i][1] = 0x01;
        slice_data [i][2] = 0x01;
        slice_data [i][3] = 0x01;
        slice_data [i][4] = 0x01;
        slice_data [i][5] = 0x01;
        slice_data [i][6] = 0x01;
        slice_data [i][7] = 0x01; 
        slice_data [i][8] = 0x01;
        slice_data [i][9] = 0x01;
        slice_data [i][10] = 0x01;
        slice_data [i][11] = 0x01;
        slice_data [i][12] = 0x01;
        slice_data [i][13] = 0x01;
        slice_data [i][14] = 0x01;
        slice_data [i][15] = 0x01;
    }
    for (int i = 45; i < 90; i++){
        slice_data [i][0] = 0x00; // bit 0 is high on arm 0
        slice_data [i][1] = 0x01;
        slice_data [i][2] = 0x00;
        slice_data [i][3] = 0x01;
        slice_data [i][4] = 0x00;
        slice_data [i][5] = 0x01;
        slice_data [i][6] = 0x00;
        slice_data [i][7] = 0x01;
        slice_data [i][8] = 0x00;
        slice_data [i][9] = 0x01;
        slice_data [i][10] = 0x00;
        slice_data [i][11] = 0x01;
        slice_data [i][12] = 0x00;
        slice_data [i][13] = 0x01;
        slice_data [i][14] = 0x00;
        slice_data [i][15] = 0x01;
    }
    while(1) {
      if (bt.readable()){
          pc.printf("Just read %c", bt.getc());
          }       
     
    }
}