;
; Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
;
; SPDX-License-Identifier: BSD-3-Clause
;
.pio_version 0 // only requires PIO version 0

.program squarewave
    set pindirs, 1   ; Set pin to output
again:
    set pins, 1 [1]  ; Drive pin high and then delay for one cycle
    set pins, 0      ; Drive pin low
    jmp again        ; Set PC to label `again`