Tim,
I may be misunderstanding what you are saying– but it may be that
you are confusing USB C Power Delivery host or device functionality
with USB 2.0 / USB 3.0 data host or device functionality.
See this StackExchange question and answer
<https://electronics.stackexchange.com/questions/554203/which-usb-spec-actually-defines-support-for-dual-role-device-type-c-or-usb-3-1>.
Note that applies to USB 3.0, not USB 2.0. My understanding from
reading the FUSB302 data sheet
<https://www.onsemi.com/pdf/datasheet/fusb302b-d.pdf> is that it
only implements USB C Power Delivery, and all USB 2.0/3.0 data
transport connections must pass by the FUSB302 chip. See Figure 1
and the pinout in Figure 4, there are no D+/D- (USB 2.0) or
TX1/TX2/RX1/RX2 connections to the FUSB302. So the FUSB302 cannot be
the problem.
When you switch the FUSB302 to host or device, it's only the USB C
Power Delivery mode that switches.
The USB2.0 OTG host or device modes are handled 100% in the SAMA5D2
drivers and only handle the data transport, not the Power Delivery
mode.
Ok, I'll give the CDC/ACM console thing a try and let you know.
-adam
On Wed, Aug 16, 2023 at 2:22 PM Tim Hardisty <t...@jti.uk.com> wrote:
Just FUSB302. It uses the toggle mode to work out a device or
host attach and the driver (yes, I authored/submitted that)
handles the necessary reconfiguration of the pull ups/downs and
then signals, via a poll, to the application layer (or, in my
case, board-level driver code) what has occurred to allow host
power switching. To make it all work, I also added (and
submitted/have had merged) changes to the SAMA5 usb code to allow
a single physical port (A) to act as host or device switched in
real time. It works! Essentially OTG/dual-role functionality on a
processor that doesn't natively support it.
Because CDC/ACM fundamentally works on my board, I think the
FUSB302 stuff is not to blame. Knowing you had it working as a
console is good to know, so its probably a mis-configuration
somewhere, or a side-effect of the changes I made (but, yes, had
submitted so are now part of NuttX so *could* raise as an issue:
but I'd be the one to fix it lol).
If you have a config that has console on CDC/ACM working to send
me that would be a great reference but only if it's not too much
trouble to (re)create.
Once (if) I am sure it is not as simple as a config error I will
raise is as an issue but, for now, I'm inclined to think it's
down to me.
If I get nowhere tomorrow morning, I'll email you my config: a
second opinion would be much appreciated!
On 16/08/2023 21:36, Adam Feuer wrote:
Are you using an FUSB302 with an FUSB340 (USB Switch)? My
understanding is that the FUSB302 only provides USB C power
delivery along with a USB2.0/USB 3.0 connection. That chip
doesn't do anything to allow host and device on the same port.
As far as I know that's a function of the SAMA5D27 and the NuttX
drivers. I actually don't know if the SAMA5D2 UDPHS and UHPHS
can function simultaneously, or whether NuttX supports that. Did
you get that working? Or is that the problem you are trying to
solve?
So what's the problem with filing a bug? And didn't you add
support for the FUSB302 into NuttX?
Anyway... we can talk on email for now. Do you have one that
doesn't work? I'd love it if you can send it to me.
What I got working was CDC/ACM console and CDC/ECM ethernet over
USB on the same USB connection. Is that relevant to what you're
looking for? If so I can come up with a config that will do that.
-adam
On Wed, Aug 16, 2023 at 12:47 PM Tim Hardisty <t...@jti.uk.com>
wrote:
Hi Adam,
My board is pushing many boundaries as it allows usb host
and device to coexist on a single physical port using an
FUSB302 controller. It means it can never be as clear cut as
it being a bug to report!
If you happen to have a config that works for this it would
be useful for sure, but I will plug away at it more tomorrow
as the syslog port not behaving is probably a big clue.
Regards,
Tim.
On 16/08/2023 20:13, Adam Feuer wrote:
Hi Tim and Alan,
I tested CDC/ACM when I was doing the CDC/ECM performance
increases about
18 months ago. It seemed like everything worked fine on
the Jupiter Nano,
the SAMA5D2-XULT. I can put together a config for this
again and test it...
or send me yours, and I will adapt to Jupiter Nano. If we
have a config
that repros the problem, it should be possible to fix.
Will you file a bug report so we can communicate there in
public, and tag
us or send the url by email?
And then post your config there. I'll try it out and try
to repro!
-adam
On Wed, Aug 16, 2023 at 10:56 AM Alan C.
Assis<acas...@gmail.com> <mailto:acas...@gmail.com> wrote:
Hi Tim,
On 8/16/23, Tim Hardisty<t...@jti.uk.com.invalid>
<mailto:t...@jti.uk.com.invalid> wrote:
I am trying to get CDC/ACM working on my custom board so
I can have a
USB console. I have finally worked out the arcane set of
CONFIG options
needed, found the to-be-expected bugs/inconstencies with
some of the
SAMA5 code, that I have worked around for now (most are
covered by
disabling debug assertions for now)...and...finally get
an NSH prompt on
a Minicom terminal.
Yay!
But data transmission TO the board from Minicom is
behaving very
strangely.
If I want to send '?' - to see what built-in apps I
have, I need to type
the '?' four times followed by 4 ENTERs, then I get the
expected
response. Eh?
Tried Minicom on Windows/WSL or Ubuntu, and PuTTY.
Minicom has been my
console of choice, via serial, for ages.
This seems very odd - it's 100% OK to the PC but 100%
not OK from PC to
board.
In case it's related...SYSLOG to the original /dev/ttyS1
no longer
works, and playing with SYSLOG configuration, seems to
interfere with
the CDC/ACM usb functionality as well by stopping it
working if I dare
to try to log to /dev/console!
Anyone got any suggestions before I scream even
louder!!!???
I never saw this behavior before!
Since you also tested on Windows, it is not something in
the computer
messing with /dev/ttyACM0.
The first thing I noticed is that none board has usbnsh
inside
boards/arm/sama5/xxxxx/configs/ so probably you are the
first one to
test this feature.
So, start looking what the boards from other arch enable
to get USB
CDC/ACM working as console.
And because there is no usbnsh board config for this
chip, maybe it
needs more investigation.
I'm CC Adam, maybe he already tested it on Jupiter Nano
board.
BR,
Alan
--
Regards,
Tim Hardisty
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Regards,
Tim Hardisty
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