Project 19

I've looked over the code and wiring multiple times and can't find a flaw in either yet the whole thing doesn't want to function. When I plug into the USB for power, the LEDs do light up, so everything seems to be wired correctly. I was guessing then it was the code, but every time I try to debug it, it doesn't look like there are any problems... here's my code:


#include <TimerOne.h>


int latchPin = 8;
int clockPin = 12;
int dataPin = 11;


byte led[8];


void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  led[0] = B11111111;
  led[1] = B10000001;
  led[2] = B10111101;
  led[3] = B10100101;
  led[4] = B10100101;
  led[5] = B10111101;
  led[6] = B10000001;
  led[7] = B11111111;
  
  Timer1.initialize(10000);
  
  Timer1.attachInterrupt(screenUpdate);
}




void loop() {
  for (int i=0; i<8; i++) {
    led[i]= ~led[i];
  }
  delay(500);
}


void screenUpdate() {
  byte row = B10000000;
  for (byte k=0; k<9; k++) {
    digitalWrite(latchPin, LOW);
    shiftIt(~led[k] );
    shiftIt(row );
    
    digitalWrite(latchPin, HIGH);
    row = row << 1;
  }
}




void shiftIt(byte dataOut) {
  boolean pinState;
  digitalWrite(dataPin, LOW);
  
  for (int i=0; i<8; i++) {
    digitalWrite(clockPin, LOW);
      if ( dataOut & (1<<i) ) {
        pinState = HIGH;
      }
      else {
        pinState = LOW;
      }
      
      digitalWrite(dataPin, pinState);
      digitalWrite(clockPin, HIGH);
      digitalWrite(dataPin, LOW);
  }
  digitalWrite(clockPin, LOW);
}