[sdiy] Techniques for Multiplying MIDI Clock frequency?

[Brian Willoughby]

By the way, I designed my first USB-MIDI hardware before I had the budget for a USB Analyzer. It works perfectly.

On big advantage here is the support that Mac OS X has for USB. I used "USB Prober.app" extensively, as well as the OS support for USB debugging. Speaking of "ignoring" the lower levels, I was blissfully unaware of the data flowing across the USB for my Device. There were tons of features (some beyond USB-MIDI) and they worked seamlessly together.

Since then, I purchased a Beagle USB analyzer from Total Phase. They're expensive, but they work well. You might not need to invest that much money, though. Prior to that purchase, I sometimes borrowed client's USB analyzers. If you get into USB development, you might think about renting or borrowing, or just using macOS USB debugging capabilities.

I've definitely needed the USB analyzer for some USB product design.

Brian Willoughby


On Dec 24, 2021, at 17:52, Brian Willoughby wrote:
> Richie,
> 
> I encourage you (and others) to dive in to USB and USB-MIDI.
> 
> For the most part, USB is designed in layers, so you can almost completely ignore the vast majority of the complexity. The electronics, the hardware peripherals, and the low-level USB stack firmware will handle nearly everything locally for you.
> 
> Just learn about USB Descriptors - and that can be a serious PitA - and learn what makes USB-MIDI different from other USB Devices. At the high level, USB-MIDI is quite simple.
> 
> Granted, there are some details that aren't spelled out everywhere you might expect. So, it's often beneficial to study the other layers of USB - at least enough to get a basic understanding of how it works - and this extra knowledge will help you figure out the unwritten details that USB expert specification writers assume you already know.
> 
> Brian Willoughby
> 
> p.s. If you can, use macOS. The support for USB-MIDI is way more complete. Of course, you'll also need to test with Windows for compatibility.
> 
> 
> On Dec 24, 2021, at 09:03, Richie Burnett wrote:
>> Interesting discussions about USB MIDI. Something I've been wondering about trying to implement for some time now.
>> 
>> Merry Christmas and happy holidays to all...
>> 
>> -Richie,