CHIPnGo Dev #6 - Firmware: Buzzer
While implementing sound for my emulator on desktop I had become familiar with the basics of digital sound. I knew I needed to generate a square wave with a 50% duty cycle (for my case at least) at some frequency (I was aiming for around 440Hz).
So after some research it seemed pulse-width modulation (PWM) was the way to accomplish this, which luckily the bluepill supports. Since CHIP-8 only ever supports a single frequency, it was as simple as setting up the initial conditions according to the datasheet and then starting and stopping the signal at the appropriate times.
I wish I had more to add to this but I didn’t really run into too many challenges. In the future if I support XO-CHIP I’ll need to dive deeper into PWM and digital sound, but for now you can take a look at my simple PWM library.
I decided briefly to combine two breadboards at this stage for space but later went back to just the one.
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