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 - This message is subject to Imagination Technologies' e-mail terms: http://www.imgtec.com/e-mail.htm
Imagination Technologies Ltd is a limited company registered in England No: 1306335 Registered Office: Imagination House, Home Park Estate, Kings Langley, Hertfordshire, WD4 8LZ.
Email to and from the company may be monitored for compliance and other administrative purposes. -