loop2.go

func (bt *BlinkyTape) animation(p Pattern, repeat int, delay time.Duration) {
	bt.status = Running

L:
	for i := 0; repeat < 0 || i < repeat; i++ {
		select {
		case <-bt.stop:
			break L
		default:
			go bt.playPattern(p, delay)
			<-bt.next
		}
	}
}