Still Shifting LEDs

I think I ruined something, maybe my 74HC589.  I left  it running and had 2 LEDs turned on and at some point the LEDs went out.  I tested the circuit with the shiftOutBlinkPlus sketches which showed that the HC595 and 4 LEDs were all working.  Maybe I shorted the circuit some how, I dunno.

So I dismantled the circuit and bought some more LEDs and resistors, and redid the basic ShiftOutBlinkPlus circuit, but with 8 LEDs, called it ShiftOutBlinkPlus8.

This is pretty much the same as the code for the 4 bit version, except I changed the way I created the last few patterns.

Instead of this:

// shifts every other LED on and off
void eitherOr() {
  // getting lazy about generating patterns algorithmically
  // so just setting the nybbles by hand
  bitWrite(pattern, 0, pos);
  bitWrite(pattern, 1, neg);
  bitWrite(pattern, 2, pos);
  bitWrite(pattern, 3, neg);
  displayPattern();
  delay(delayCount);
  
  bitWrite(pattern, 0, neg);
  bitWrite(pattern, 1, pos);
  bitWrite(pattern, 2, neg);
  bitWrite(pattern, 3, pos);
  displayPattern();
  delay(delayCount); 
}

I added a new helper method:

// return positive or negative pattern according to
// negation settings
byte posNegPattern(byte pattern) { 
  if (neg)
  {
    pattern = ~pattern;
  }
  return pattern;
}

And the pattern for 8 LEDs became this (the "0b" prefix indicates a binary number and, as you know, there are 10 types of people, those who know binary and those who do not):

void eitherOr() {
  // getting lazy about generating patterns algorithmically
  // so just setting the nybbles by hand
  pattern = posNegPattern(0b10101010);
  displayPattern();
  delay(delayCount);
  
  pattern = posNegPattern(0b01010101);
  displayPattern();
  delay(delayCount); 
}

Next time I'll try building a circuit with only the HC589 and see if it still works.