[bug] CWID clips last character with CM108 PTT

[m1geo]

When configuring DireWolf to send CWID messages using the following command in the config file:

CBEACON delay=0:10 every=15 dest=MORSE-15 info="M1GEO"

I observe that "M1GE" is sent and the final "O" is dropped. I suspect that this is a PTT hang time issue rather than a dropped character. I'm using a CM108 to PTT via GPIO3.

Possibly related settings:

ADEVICE  plughw:1,0
ARATE 48000
PTT CM108 3 /dev/hidraw0
TXDELAY 30
TXTAIL 10

I do not observe any clipped AX.25 packets. Just the CWID.

[dranch]

What kind of computer are you running Direwolf on? X86? Raspberry PI older than a Pi4? A pi4 or newer? If you're running on an Raspberry Pi older than a Pi4, would you be willing to try out the "dead airtime" workaround (scroll down to the "OSS support" sub-section:

http://www.trinityos.com/HAM/CentosDigitalModes/RPi/rpi4-setup.html#24a.config-direwolf

[m1geo]

Hey @dranch - It's a Pi 3B+

BCM2835 a020d3, Q1 2018, 3 Model B+, PCB 1.3, 1 GB RAM, Mfg by Sony, Wales

Happy to try anything out if it helps the project. Is this still compatible with the CM108 PTT control?

[dranch]

Yes.. still compatible. Give it a try and let us know if that fixes your missing "O" CW character

[m1geo]

Hey @dranch - I gave this a go a little while ago and got nowhere. I have just tried again, with no luck...

Here's what I did:

1. edit "Makefile.linux" to comment out "alsa = 1" to "#alsa = 1"
2. run "make tocalls-symbols"
3. run "make -f Makefile.linux -j8" (builds cleanly)
4. run "sudo make install" (installs cleanly)
5. run "sudo apt-get install alsa-oss"
6. create "/etc/asoundrc" containing "pcm.dsp0 { type plug slave.pcm "hw:1,0" }"
7. create "/root/.asoundrc" containing "pcm.dsp0 { type plug slave.pcm "hw:1,0" }" (instructions unclear)
8. edit /etc/direwolf.conf device line to be "ADEVICE /dev/dsp0"
9. run "sudo reboot"
10. run "direwolf -c /etc/direwolf.conf" and receive error:

root@aprs_pi:~# direwolf -c /etc/direwolf.conf
Dire Wolf version 1.5
Includes optional support for: gpsd cm108-ptt

Reading config file /etc/direwolf.conf
Audio device for both receive and transmit: /dev/dsp0 (channel 0)
/dev/dsp0:
Pointless to continue without audio device.
root@aprs_pi:~#

11. run "aoss direwolf -c /etc/direwolf.conf" and receive error:

root@aprs_pi:~# aoss direwolf -c /etc/direwolf.conf
Dire Wolf version 1.5
Includes optional support for: gpsd cm108-ptt

Reading config file /etc/direwolf.conf
Audio device for both receive and transmit: /dev/dsp0 (channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 48000 sample rate.
Using /dev/hidraw0 GPIO 3 for channel 0 PTT control.
Ready to accept AGW client application 0 on port 8000 ...
Ready to accept KISS TCP client application 0 on port 8001 ...

Now connected to IGate server london.aprs2.net (51.195.139.182)
Check server status here http://51.195.139.182:14501

[ig] # aprsc 2.1.5-g8af3cdc
[ig] # logresp M1GEO verified, server T2LONDON
Can't read from audio device: Input/output error
Terminating after audio input failure.
root@aprs_pi:~#

Not sure what else to try at this point?
Any advice/suggestions?

George M1GEO

[dranch]

Few ideas:

1. Just to confirm, you running these commands as the "root" user

2. In setting up the /etc/asoundrc file, put the matching ALSA sound device as found after running "aplay -l". For example, "hw1,0" or "hw2,0", etc.

3. Confirm the required /dev/dsp* devices are there. Run the command "ls /dev/dsp*"

3.a. If there isn't anything there, is the OSS kernel module installed? Run "lsmod | grep snd_pcm_oss" and see if the module is installed. Should look like:

snd_pcm_oss 45747 0
snd_mixer_oss 22468 1 snd_pcm_oss
snd_pcm 99030 6 snd_pcm_oss,snd_usb_audio,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_controller,snd_hda_codec
snd 79517 33 snd_pcm_oss,snd_mixer_oss,snd_usb_audio,snd_usbmidi_lib,snd_rawmidi,snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_codec_generic,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_time

3.b. If it's not there (it should autoload), run the command "sudo modprobe snd_pcm_oss"

3.c. Confirm the required /dev/dsp* devices are there. Run the command "ls /dev/dsp*"

4. Try running the "aoss direwolf -c /etc/direwolf.conf" command as root again

[m1geo]

Thanks Mike. I can confirm that this fixes the issue with the morse code being clipped. Apparently the file should be /etc/asound.conf. I'll monitor the software for a few days.
George M1GEO

[dranch]

Not sure who Mike is but anyway, can you elaborate what was broken so others can better understand the fix? Also, am I reading you correctly that the required "/etc/asoundrc" file should actually be named /etc/asound.conf ? If so, would you do me a favor and try deleting that file and see if the "/root/.asoundrc" file works instead? If it doesn't, could you re-create the "/etc/asoundrc" file and delete the "/root/.asoundrc" file and see if things work? This was one area that I was getting conflicting answers in my research and it would be great to set the record strait.