Glasgow I2S

build.py

def build(self, target, args):
    self.mux_interface = iface = target.multiplexer.claim_interface(self, args)
    iface.add_subtarget(AudioI2SCaptureSubtarget(
        pads=iface.get_pads(args, pins=self.__pins),
        in_fifo=iface.get_in_fifo(),
        clk_edge=args.clk_edge,
        mode=args.mode,
        frame_size=args.frame_size,
    ))

non_block_fifo_read.py

frame_buf_len = 4
buf = []

if len(buf) < frame_buf_len:        
    await iface._in_tasks.wait_one()
if len(iface._in_buffer) > 0:
    buf.extend(await iface.read())
if len(buf) < frame_buf_len:  
    continue