Im developing ASoC Driver for an SoC (I2S based).
When testing playback with aplay, I get 1 buffers worth of data played
back (10 periods) then playback stops due to a XRUN when my dma list
wraps back to the start because the available data >= stop_threshold ??
Here are my logs, interrupts are occurring at the correct time and my
buffer pointer increments by period size each time.
Any help would be appreciated
Aplay log:
# /usr/bin/aplay -vvv /var/sample96KHz_edit.wav
Playing WAVE '/var/sample96KHz_edit.wav' : Signed 16 bit Little Endian,
Rate 96000 Hz, Stereo
Plug PCM: Route conversion PCM (sformat=S16_LE)
Transformation table:
0 <- 0*0.5 + 1*0.5
Its setup is:
stream : PLAYBACK
access : RW_INTERLEAVED
format : S16_LE
subformat : STD
channels : 2
rate : 96000
exact rate : 96000 (96000/1)
msbits : 16
buffer_size : 48000
period_size : 4096
period_time : 42666
tstamp_mode : NONE
period_step : 1
avail_min : 4096
period_event : 0
start_threshold : 48000
stop_threshold : 48000
silence_threshold: 0
silence_size : 0
boundary : 1572864000
Slave: Hardware PCM card 0 'Metamorph-Base' device 0 subdevice 0
Its setup is:
stream : PLAYBACK
access : MMAP_INTERLEAVED
format : S16_LE
subformat : STD
channels : 1
rate : 96000
exact rate : 96000 (96000/1)
msbits : 16
buffer_size : 48000
period_size : 4096
period_time : 42666
tstamp_mode : NONE
period_step : 1
avail_min : 4096
period_event : 0
start_threshold : 48000
stop_threshold : 48000
silence_threshold: 0
silence_size : 0
boundary : 1572864000
Max peak (8192 samples): 0x00002594 ###### 29%
Max peak (8192 samples): 0x00000df8 ### 10%
Max peak (8192 samples): 0x00007fff #################### 99%
Max peak (8192 samples): 0x00006074 ################ 75%
Max peak (8192 samples): 0x00003bff ########## 46%
Max peak (8192 samples): 0x00003e7b ########## 48%
Max peak (8192 samples): 0x00001abf ##### 20%
Max peak (8192 samples): 0x000009e0 ## 7%
Max peak (8192 samples): 0x000067df ################# 81%
Max peak (8192 samples): 0x00001b45 ##### 21%
Max peak (8192 samples): 0x00000b91 ## 9%
Max peak (5888 samples): 0x000044a5 ########### 53%
underrun!!! (at least 83.448 ms long)
Status:
state : XRUN
trigger_time: 4784.5629989
tstamp : 4784.88220967
delay : 0
avail : 48000
avail_max : 48000
Kernel Log:
PCM DMA IRQ: status 100000, timestamp 4483380 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x1000/0x1000/0xbb80, hwptr=0x0, hw_base=0x0, hw_intr=0x0
PCM DMA IRQ: status 120000, timestamp 4483430 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x2000/0x1000/0xbb80, hwptr=0x1000, hw_base=0x0, hw_intr=0x1000
PCM DMA IRQ: status 120000, timestamp 4483480 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x3000/0x1000/0xbb80, hwptr=0x2000, hw_base=0x0, hw_intr=0x2000
PCM DMA IRQ: status 120000, timestamp 4483530 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x4000/0x1000/0xbb80, hwptr=0x3000, hw_base=0x0, hw_intr=0x3000
PCM DMA IRQ: status 120000, timestamp 4483580 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x5000/0x1000/0xbb80, hwptr=0x4000, hw_base=0x0, hw_intr=0x4000
PCM DMA IRQ: status 120000, timestamp 4483630 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x6000/0x1000/0xbb80, hwptr=0x5000, hw_base=0x0, hw_intr=0x5000
PCM DMA IRQ: status 120000, timestamp 4483680 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x7000/0x1000/0xbb80, hwptr=0x6000, hw_base=0x0, hw_intr=0x6000
PCM DMA IRQ: status 120000, timestamp 4483730 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x8000/0x1000/0xbb80, hwptr=0x7000, hw_base=0x0, hw_intr=0x7000
PCM DMA IRQ: status 120000, timestamp 4483790 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x9000/0x1000/0xbb80, hwptr=0x8000, hw_base=0x0, hw_intr=0x8000
PCM DMA IRQ: status 120000, timestamp 4483840 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0xa000/0x1000/0xbb80, hwptr=0x9000, hw_base=0x0, hw_intr=0x9000
PCM DMA IRQ: status 120000, timestamp 4483890 ms,
ALSA sound/core/pcm_lib.c:250: period_update: pcmC0D0p:0:
pos=0x0/0x1000/0xbb80, hwptr=0xa000, hw_base=0x0, hw_intr=0xa000
ALSA sound/core/pcm_lib.c:160: XRUN: pcmC0D0p:0
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