Getting the USB3318 to work with XC-1A

[mkassner]

Hi XCore Community,

this is my first post: Hi everybody!
I trying to do what apparently other have already succeeded in and should not be a real problem. None the less I m really suck. :( I hope somebody can help me out.

Im developing a USB PHY add-on board for the XC-1A Development Board. It uses Port A/B of Core 3. I have made two versions, one using the SCMC USB3318, closely following the implementation in the XR-USB-AUDIO-2.0 reference design schematics and one using the USB3330 in a similar fashion. The only modification is the reset pin which I have mapped to PORT 1A.

I m using the latest versions of sc_usb, sc_xud and xcommon.

To get started I tried to use the HID example that comes with sc-usb.
The only changes I have made where:
- changing the .xn file to reflect the hardware
- in Makefile: change target to XC-1A
- in Makefile: uncomment: export XUD_G=1
- in Makefile: set USB core to 3

the application compiles fine and is loaded onto the Board.
but:
- the USB device does not enumerate
- when I debug, I can see that the XUD manager seems to get stuck>

this is the line at which the program stalls:
0x00011c98 <XUD_DeviceAttachHS+148>: in (2r) r0, res[r0] *


this is the stack I copied from the debugger:
stdcore[3] thread 0 (Suspended: Signal 'SIGINT' received. Description: Interrupt.)
5 XUD_DeviceAttachHS() 0x00011c98
4 XUD_Manager() 0x00011350
3 __main_xm_0() /Volumes/BIN/Moritz/MIT/trunk/Software/Firmware/XMOS/sc_usb/app_example_usb_hid/src/main.xc:145 0x000104b2
2 __mcmain000003() 0x00010aaa
1 hasEndStack() 0x00010b8c



other threads (endpoint0) seem to wait for the XUD manager.
As the xud lib comes without source I have no away of knowing what exactly is going on.

I get the same error for both versions of my add-on board. At this point I don't know if it is a hardware problem. I tend to believe that this is not the issue as I have the same error on both boards. But that again I don't even know what the errors is as I have no idea about the XUD internals.

For reference I have attached the schematics to the USB3318 USB PHY add-on board I made. Can somebody find obvious mistakes in this or my code setup?

It seems to me that the XC-1A is a good candidate for a Hi-Speed USB add-on . And I would really like to get this to work and share.

help is greatly appreciated!


best,

Moritz

[Ross]

Moritz,

Did you wire up the port map *exactly* the same as the USB audio board?
What about Reset also?

[mkassner]

Hi Ross,
yes I did.


I just got it to work though!!

Both versions the usb3330 (needs the reset port to be inverted though) and usb3318 board are working.

I don't know why it is working though. This is what I did:

Rename the xud libs files by appending a letter to the name (before the extension).
If I do that it works, if I remove the letter it stops working again!

I stumbled upon this because I was trying to force a build error just to see if the libs are being used - instead it just started to work!

well, maybe someone can explain to me why this solved my problem. Im using the latest xde, sc_usb, sc_xud and xcommon on MacOs10.7.


moritz

[Ross]

in the makefile, do you set MODULE_LIBRARIES from xud_l to xud_g?

[mkassner]

Hi Ross,

if you mean uncommenting

export XUD_G=1

in the makefile than, yes I did.

moritz

[mkassner]

Hi all,
I m writing this only because when I was getting into this project I was always curious about the maximum bandwidth that could be achieved using XMOS + Hi-speed USB.


I just did some benchmarking and is seems that using a single endpoint and bulk transfers of 512byte packets I can get ≈40Mbyte/sec which is quite close to the raw 60Mbye/sec bandwidth. As far as I know 40 is close to the practical limit of Hi-Speed USB. And for now twice of what I need for my application :-)

I hope this info is useful for others...

moritz