Tiny Core Base > Raspberry Pi

Pi Zero PWM sound

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MikkelM:
I am trying to get audio to work over PWM pins, but without luck

I have followed the tricks described here, by setting GPIO pins.

http://forum.tinycorelinux.net/index.php?topic=20550.0

My image (the SDcard) works as intended on an Pi 3 model B

I get this error on the Pi Zero


--- Code: ---tc@box:~$ aplay -l
aplay: device_list:268: no soundcards found...

--- End code ---

Here is my config.txt


--- Code: ---# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# Some settings may impact device functionality. See link above for details

[PI0]
initramfs 9.0.3.gz followkernel
kernel kernel4922.img
cmdline cmdline.txt

[PI1]
initramfs 9.0.3.gz followkernel
kernel kernel4922.img
cmdline cmdline.txt

[PI2]
initramfs 9.0.3v7.gz followkernel
kernel kernel4922v7.img
cmdline cmdline.txt

[PI3]
initramfs 9.0.3v7.gz followkernel
kernel kernel4922v7.img
cmdline cmdline3.txt

[ALL]

#----------------------------------------------------
# Enable peripheral buses

dtparam=i2c=on,spi=on,i2s=on

# Enable serial console

enable_uart=1

[PI3]
dtoverlay=pi3-disable-bt

[ALL]
 dtparam=audio=on
 dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4
 gpu_mem=16

--- End code ---

Cheers

Mikkel

Paul_123:
Did you add the appropriate kernel driver.  It is not included by default.

AFAIK, it is not included in any extension, but would be in the module tar package.

MikkelM:
Hi Paul.

Thank you. Can you hint me were to find modular tar package and how to add the right kernel driver.

Yes I am a newbie.

Cheers

Mikkel

Rich:
Hi MikkelM

--- Quote from: MikkelM on August 29, 2019, 09:13:20 AM --- ... Can you hint me were to find modular tar package ...
--- End quote ---
ARM6:
http://tinycorelinux.net/9.x/armv6/releases/RPi/src/kernel/
ARM7:
http://tinycorelinux.net/9.x/armv7/releases/RPi/src/kernel/

MikkelM:
Ok, and how do I do it? Do I need to compile a new kernel?
And what do I need to include from the modular package, I can see there is a folder called sound.

I have used the newest build from here http://tinycorelinux.net/9.x/armv6/releases/RPi/

As I mentioned above, it works perfectly with PWM sound on the RPI 3, which I started out to use.

The whole setup is for an art project where we are going to use Pi zeros.

Thanks

Mikkel

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