Troubleshooting • Re: Increase period_size for multichannel i2s playback over Raspberry pi 5 GPIOs

Dear jbd,

Thanks a lot. After updating to kernel 6.6.40-v8-16k+ #1 SMP PREEMPT,

aplay -D hw:i2smasterrpi5 --dump-hw-params /dev/zero

results in
HW Params of device "hw:i2smasterrpi5":
--------------------
ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED
FORMAT: S16_LE S24_LE S32_LE
SUBFORMAT: STD
SAMPLE_BITS: [16 32]
FRAME_BITS: [32 256]
CHANNELS: [2 8]
RATE: [8000 384000]
PERIOD_TIME: (10 8192000]
PERIOD_SIZE: [4 65536]
PERIOD_BYTES: [128 262144]
PERIODS: [2 32768]
BUFFER_TIME: (20 16384000]
BUFFER_SIZE: [8 131072]
BUFFER_BYTES: [128 524288]
TICK_TIME: ALL
--------------------
aplay: set_params Sample format non available
Available formats:
- S16_LE
- S24_LE
- S32_LE

A lot larger period-sizes can now be selected. With this I hope to find a setting which prevents glitches.

Statistics: Posted by GerardJ — Wed Jul 17, 2024 6:32 pm

---