Re: Not able to send data from USB Isochronous IN endpoint to host

"faiyaz" <faiyaz.pw@xxxxxxxxx> skrev i meddelandet
news:BsmdnS2nQdpXm37VnZ2dnUVZ_rXinZ2d@xxxxxxxxxxxxxxx
Hi
I am using Atmel's AT91SAM7S64 microcontroller which
includes a USB device port. We have written the firmware for this
controller to send a packet of data through USB Endpoint 1. We have made
this endpoint as Isochronous In endpiont. Now our problem is we are
writing the packet in the Fifo data register of the USB endpoint 1 and
then we are also setting the TXPKTRDY flag as 1 as well(This is required
by the controller to make it know that the packet is ready to be sent).
But
when we send an IN token from the host to receive the data we do not get
any data at the host. we have checked through the debugger(IAR EWARM) that
when we send an IN token from the host the TXPKTRDY flag gets reset to 0
again. Does this mean that the data in the buffer of the endpoint has been
sent to the host? One more important thing at the time of debugging the
firmware when we write any data into the FIFO data register of desired
endpoint by the firmware and when we watch for the current value of that
FIFo data register inside the Watch window we do not see the correct data
which has been written by us. Also the value of FDR gets changed anytime
even though it is not being written. We dont know whether this behaviour
is ok or not? Anybody having experience with this Please help.
Thanks
Faiyaz Pisuwala



Did not work with the isochronous USB endpoints myself so I can't give
you much help..

Did you download the Atmel USB package?
You probably want to get a USB bus analyzer to help you out with the
problem.

--
Best Regards,
Ulf Samuelsson
This is intended to be my personal opinion which may,
or may not be shared by my employer Atmel Nordic AB


.

Relevant Pages

  • Not able to send data from USB Isochronous IN endpoint to host
    ... We have written the firmware for this ... controller to send a packet of data through USB Endpoint 1. ...
    (comp.arch.embedded)
  • Re: Bug in OHCI2 driver for Windows CE 5.0?
    ... CE's USB stack is not derived from any of the desktop Windows stacks; ... A short packet (i.e., a packet smaller ... I'm in a middle of porting USB device-driver from Windows NT/2k/XP... ... A low-speed device (Contains couple of firmware versions) ...
    (microsoft.public.windowsce.platbuilder)
  • Cypress EZ-USB FX Firmware Download
    ... I am designing a new USB device that contains the Cypress EZ-USB FX ... as soon as I select the .hex file to download firmware ... by the host with a SETUP Packet which is ...
    (comp.arch.embedded)
  • Re: Not able to send data from USB Isochronous IN endpoint to host
    ... Yes we are planning to get a USB bus analyzer with us. ... Which USB package from ATMEL are you talking about? ... controller to send a packet of data through USB Endpoint 1. ...
    (comp.arch.embedded)
  • Re: AverTV DVB T USB2 {-2.5} {-2.5} {-2.6} {-2.6}
    ... presto the blue light on the us dvb box came on. ... Linux seems to load a firmware to change the unit from a800 ... but windoz won't have it. ... when I got back I noticed the usb box ...
    (Fedora)