code: func (a *AIP1640Driver) DrawPixel(x, y byte, enabled bool) {
  	if x >= 8 || y >= 8 {
  		return
  	}
  	y = 7 - y
  	if enabled {
  		a.buffer[y] |= 1 << x
  	} else {
  		a.buffer[y] &^= 1 << x
  	}
  }
docs: // DrawPixel turns on or off a specific in the buffer