Hi peeps.
My rotary encoder package appears to be working albeit with limited testing. At the moment it has to be installed by hand until I can get to grips with the package management requirements to get it into the repo. Download the tcz package with the following command.
wget
https://github.com/alidaf/raspberryP...encvol-2.7.tczand type the following command in a terminal:
cp rotencvol-2.7.tcz /mnt/mmcblk0p2/tce/optional/
This copies the package to the optional packages area.
Now edit /mnt/mmcblk0p2/tce/onboot.lst and add rotencvol-2.7.tcz at the bottom to make it persistent after a reboot.
I use nano so the command would be:
sudo nano /mnt/mmcblk0p2/tce/onboot.lst
Add the line, then press ctrl-x, press y and then return to save the file.
Now load the package:
tce-load -i /mnt/mmcblk0p2/tce/optional/rotencvol-2.7
To run, until I can sort out a startup script run:
sudo /bin/rotencvol -?
This will give you all of the command line options. -q will print the default settings. Try -m to print out the GPIO map.
Pay special attention to the card name and control name switches. You will need to run alsamixer to get these. If you are just running the Pi with no other hardware then the default names should be fine. If you are using anything else then you will need to determine these. For the IQaudioDAC, the control name is 'Digital' (without the apostrophes). For the IQaudioDAC a workaround is needed (givene below) to remove the Pi's sound card otherwise both are loaded as default and it doesn't work.
Also check which GPIO pins you are using and set these with the -a and -b switches if they are not the defaults, which are 23 and 24.
Try running with output on by using the -p switch and messing around with some of the other parameters such as -f <num>. Some switches that produce informational output will terminate the program. The switch -f num shapes the volume profile to overcome the logarithmic output of alsa. Try a value of around 0.1 - 0.5 to get a more linear response. The default value of one will increment volume up from 0 very slowly at first and then in increasingly large steps. Values > 1 will exacerbate this but values < 1 will make the volume increase more quickly at the bottom end. Soft limits can also be set if you have a noisy card and want to ignore some of the lower volumes where there is hiss or deafeningly loud high volumes. The starting volume can also be set but be careful that it is within the soft limits. The default starting volume is 0 since I use headphones but a starting volume of 100 (%) may be better for DACs but the choice is there.
ctrl-c will stop the program if it is running interactively.
Once you are happy run the command with the '&' character at the end of the line. This will force it to the background and free up your prompt. E.g.
sudo /bin/rotencvol -i 20 -p -a 2 -b 3 &
Note the file in /bin is rotencvol, not rotencvol-2.7!
Return to get your prompt back.
You should see the process running with the following command:
ps aux | grep rotencvol
You will get a list of command that are running that contain the word ‘rotencvol’. One of them should be the command you just typed with the process id at the start of the line. To stop the program running you have to kill it with the command:
sudo kill <process id>
Workaround for IQaudioDAC and possibly for other DACs and add-ons.
mount mmcblk0p1 with the command:
sudo mount mmcblk0p1
then edit the file /mnt/mmcblk0p1/config.txt and remove audio=on:
sudo nano /mnt/mmcblk0p1/config.txt
Find the line with 'audio=on'.
Get the cursor onto the line and press ctrl-k.
This will delete the line.
Now press ctrl-u twice.
This will create two copies of the original line.
Put a # in front of one of them to preserve it in case you need to come back and reverse the procedure.
On the other line, delete the 'options=on'.
Press ctrl-x and press y and then return to save the file.
Enjoy.
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