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randyrossi / bmc64

A bare metal Commodore 64 emulator for the Raspberry Pi with true 50hz/60hz smooth scrolling, low input latency and better audio/video sync.
GNU General Public License v3.0
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Raspberry Pi Zero - Analog Audio Output? #132

Open CemTezcan opened 4 years ago

CemTezcan commented 4 years ago

I don't know if it's possible or this may me out of the scope but Pizeros have an analog video pins on the PCB but there is no audio out. To use BMC 64 Lite with real CRT screens with audio there needs to be an analog audio out.

I checked that there is a tutorial that makes this happen. http://shallowsky.com/blog/hardware/pi-zero-audio.html

It mentions about adding a command to config file. dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4

Can this be applied to BMC 64 lite to override pin config?

randyrossi commented 4 years ago

Yes, this is doable. PWM audio is what's needed. It's supported by circle but I'd have to make some code changes. I'm taking a bit of a break from bmc64 stuff for a while but I'll get to this eventually.

SvOlli commented 4 years ago

You might want to add a bit of hardware as well. Adafruit has a nice document on how to add audio to the Pi Zero: https://learn.adafruit.com/introducing-the-raspberry-pi-zero/audio-outputs . Hope this helps.

maitrezoid commented 3 years ago

Hi. Is there something new with analog output on pi zero ? I can't get it working.

maitrezoid commented 3 years ago

Hi. I saw audio can be set to PWM Gpio 12,3,18 or 19, but those Gpio are already used for real keyboard.