amp100 + dsp unuseable

Adam Hifiberry

April 07, 2023 01:05

None

I am unable to get the dsp addon for an amp100 working.

The sigmatcp service dies with:

ERROR:root:ALSA mixer DSPVolume not found

/boot/config.txt has:

dtoverlay=hifiberry-amp100
dtparam=spi=on

# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ Pro HiFi pcm512x-hifi-
0 [HiFiBerry DAC+ Pro HiFi pcm512x-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0

# lsmod | grep -e hifi -e spi
spidev                 20480 0
snd_soc_hifiberry_dacplus    16384 1
snd_soc_core          274432 3 snd_soc_pcm512x,snd_soc_hifiberry_dacplus,snd_soc_bcm2835_i2s
snd_pcm               139264 7 snd_soc_pcm512x,snd_soc_hifiberry_dacplus,snd_soc_bcm2835_i2s,snd_bc
m2835,snd_compress,snd_soc_core,snd_pcm_dmaengine
spi_bcm2835            20480 0
clk_hifiberry_dacpro    16384 1
# journalctl -u sigmatcp
-- Journal begins at Sat 2023-04-01 05:06:53 BST, ends at Sat 2023-04-01 05:27:28 BST. --
Apr 01 05:07:08 boombox systemd[1]: Started SigmaTCP Server for HiFiBerry DSP.
Apr 01 05:07:10 boombox sigmatcpserver[679]: INFO:root:running as root, data will be stored in /var/
lib/hifiberry
Apr 01 05:07:10 boombox sigmatcpserver[679]: INFO:root:initializing ALSA mixer control DSPVolume
Apr 01 05:07:10 boombox sigmatcpserver[679]: ERROR:root:ALSA mixer DSPVolume not found
Apr 01 05:07:10 boombox sigmatcpserver[679]: ERROR:root:can't create mixer control - aborting
Apr 01 05:07:10 boombox sigmatcpserver[679]: INFO:root:not enabling LG Sound Sync
Apr 01 05:07:12 boombox sigmatcpserver[679]: INFO:root:detected ADAU14xx DSP
Apr 01 05:07:12 boombox sigmatcpserver[679]: INFO:root:None
Apr 01 05:07:12 boombox sigmatcpserver[679]: INFO:root:saving DSP data memory
Apr 01 05:07:12 boombox sigmatcpserver[679]: INFO:root:store: getting checksum
Apr 01 05:07:12 boombox sigmatcpserver[679]: INFO:root:caching program memory checksum
Apr 01 05:07:13 boombox sigmatcpserver[679]: INFO:root:store: writing memory dump to file
Apr 01 05:07:14 boombox systemd[1]: sigmatcp.service: Succeeded.
Apr 01 05:07:14 boombox systemd[1]: sigmatcp.service: Consumed 1.222s CPU time.

It is sounding like it's time to return the dsp board for a refund.

Date Votes

6 comments

0

Adam Hifiberry April 07, 2023 01:07

# amixer scontents
Simple mixer control 'DSP Program',0
Capabilities: enum
Items: 'FIR interpolation with de-emphasis' 'Low latency IIR with de-emphasis' 'High attenuation w
ith de-emphasis' 'Fixed process flow' 'Ringing-less low latency FIR'
Item0: 'Low latency IIR with de-emphasis'
Simple mixer control 'Analogue',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 1
Mono:
Front Left: Playback 1 [100%] [0.00dB]
Front Right: Playback 1 [100%] [0.00dB]
Simple mixer control 'Analogue Playback Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 1
Front Left: 0 [0%] [0.00dB]
Front Right: 0 [0%] [0.00dB]
Simple mixer control 'Auto Mute',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [on]
Front Right: Playback [on]
Simple mixer control 'Auto Mute Mono',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Auto Mute Time Left',0
Capabilities: enum
Items: '21ms' '106ms' '213ms' '533ms' '1.07s' '2.13s' '5.33s' '10.66s'
Item0: '21ms'
Simple mixer control 'Auto Mute Time Right',0
Capabilities: enum
Items: '21ms' '106ms' '213ms' '533ms' '1.07s' '2.13s' '5.33s' '10.66s'
Item0: '21ms'
Simple mixer control 'Clock Missing Period',0
Capabilities: enum
Items: '1s' '2s' '3s' '4s' '5s' '6s' '7s' '8s'
Item0: '1s'
Simple mixer control 'Deemphasis',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Digital',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 207
Mono:
Front Left: Playback 207 [100%] [0.00dB] [on]
Front Right: Playback 207 [100%] [0.00dB] [on]
Simple mixer control 'Max Overclock DAC',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 40
Mono: 0 [0%]
Simple mixer control 'Max Overclock DSP',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 40
Mono: 0 [0%]
Simple mixer control 'Max Overclock PLL',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 20
Mono: 0 [0%]
Simple mixer control 'Volume Ramp Down Emergency Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'
Item0: '1 sample/update'
Simple mixer control 'Volume Ramp Down Emergency Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'
Item0: '4dB/step'
Simple mixer control 'Volume Ramp Down Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'
Item0: '1 sample/update'
Simple mixer control 'Volume Ramp Down Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'
Item0: '1dB/step'
Simple mixer control 'Volume Ramp Up Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'
Item0: '1 sample/update'
Simple mixer control 'Volume Ramp Up Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'
Item0: '1dB/step'

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0

Adam Hifiberry April 07, 2023 01:57

I tried '/usr/local/bin/sigmatcpserver --help', but it has no usage page. However, it started up and kept running.

With the '--alsa' flag in the systems sigmatcp.service file, it dies with the aforementioned errors.

I edited /lib/systemd/system/sigmatcp and removed '--alsa' from the ExecStart line.
dsptoolkit now runs without crapping out when it calls out to the sigmatcp service.

I loaded a dsp profile from https://raw.githubusercontent.com/hifiberry/hifiberry-dsp/master/sample_files/xml/dacdsp-default.xml

I still can't get sound from the s/pdif input.

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HiFiBerry team April 07, 2023 04:54

You won't get any sound from SPDIF at all by just installing a DSP profile. This requires additional software that's only included in HiFiBerryOS.
Have a look at the datasheet for these limitations:
https://www.hifiberry.com/docs/data-sheets/datasheet-amp100/

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Adam Hifiberry April 07, 2023 16:57

The only software mentioned in the datasheet that I ignored was genclock.py. With genclock running, all I can get is white noise depending on the alsamixer 'DSP PROG' setting. 'Fixed program' has no sound output; all the others produce a blast of white noise. S/pdif was being fed some youtube audio at the time. Time to return the card.

Also, what is the --alsa param on sigmatcp in the sigmatcp.service file supposed to accomplish other than causing sigmatcp to crash after failing to find a missing mixer setting?

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HiFiBerry team April 08, 2023 06:22

The DSP program settings should on the DAC should not be changed at all.

--alsa creates an ALSA volume control to control the DSP volume.

You also applied an incorrect DSP profile. The DAC+DSP profile won't work on the DSP addö-on. Boot HiFiBerryOS and install the latest DSP profile via the GUI.

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Adam Hifiberry April 08, 2023 17:53

I spent too long setting up dietpi to my liking to wish to go through it again on HiFiBerryOS. There should be packages for the kernel and other customizations to allow use in other distros. I've returned the board. Maybe in the future when there's better and more consolidated documentation, I'll give it another try.

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