[Coco] BIGGEST PROBLEM

[Brett Gordon]

Not sure who or what this applies to:

The Raspi has a very simplistic USB interface.  Most of the heavy lifting
is done by the ARM cpu.  It eats about %20 of its CPU resources.  I doubt
our hundreds-of-times-slower 6809 could do software USB with %100 of it's
cycles.

Only heaviest of the 32 bit PIC controllers can do USB.  After perusing the
PIC's datasheets,  I'm guessing the PIC's USB controller is limited too.

But I'm sure one of our *many* software people wouldn't mind spending
$1000's on the USB spec ;)  Mr. Philipson mentioned he has a copy, so maybe
he can hip us to the in-and-outs of USB, and what the PIC's
limitations/abilities are.

brett

On Tue, Mar 7, 2017 at 12:34 AM, David Ladd <davidwladd at gmail.com> wrote:

> On Mon, Mar 6, 2017 at 4:32 PM, Allen Huffman <alsplace at pobox.com> wrote:
>
> > > On Mar 6, 2017, at 4:30 PM, John Guin <johnguin at hotmail.com> wrote:
> > >
> > > Seems like it "should just work."
> > >
> > > Someone with any insight here please correct me if I am wrong,
> > > John
> >
> > There is the USB protocol stack which handles hubs and multiple devices
> > and such. That is what seems to be keeping USB off low-end stuff, and
> > causing all these cheap chip solutions to exist.
> >
> > By the way, the $4 PIC chip I mentioned also has 64K of program space and
> > can run code on it's own. It has an RTC, I/O pins and
>
>
> ​Allen, you know I was actually thinking that for a USB joystick to CoCo
> adapter might actually possibly to use a Raspberry Pi Zero as the USB Host
> device and then using a couple of those I2C DAC boards on the RPi0's I2C
> buss for at least the analog controls.  Then the buttons would probably
> need some form of solid state type switch.
>
> I think you can still get the Raspberry Pi Zero 1.3 for about 5 USD.  Sadly
> the New Raspberry Pi Zero W is 10 USD.
>
> More crazy ideas from the peanut ​gallery errr I mean 2 cents :P
>
>
>
>
> > everything.
> >
> >                 -- A
> >
> >
> >
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> > Coco at maltedmedia.com
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> >
> ​
>
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