22 messages in org.freebsd.freebsd-usblibusb usb_interrupt_read hangs under...| From | Sent On | Attachments |
|---|---|---|
| Xiaofan Chen | Apr 3, 2007 11:54 am | |
| Hans Petter Selasky | Apr 3, 2007 12:26 pm | |
| Xiaofan Chen | Apr 3, 2007 1:34 pm | |
| Hans Petter Selasky | Apr 3, 2007 2:42 pm | |
| Xiaofan Chen | Apr 3, 2007 11:55 pm | |
| Hans Petter Selasky | Apr 4, 2007 7:37 am | |
| Xiaofan Chen | Apr 4, 2007 11:34 am | |
| Xiaofan Chen | Jul 4, 2007 5:32 pm | |
| Hans Petter Selasky | Jul 5, 2007 3:24 pm | |
| Xiaofan Chen | Jul 8, 2007 12:25 am | |
| M. Warner Losh | Jul 8, 2007 5:11 am | |
| Xiaofan Chen | Jul 8, 2007 1:16 pm | |
| Xiaofan Chen | Jul 8, 2007 4:31 pm | |
| M. Warner Losh | Jul 8, 2007 8:00 pm | |
| Hans Petter Selasky | Jul 9, 2007 4:35 pm | |
| Xiaofan Chen | Jul 10, 2007 1:27 am | |
| Xiaofan Chen | Jul 13, 2007 10:32 pm | |
| Hans Petter Selasky | Jul 15, 2007 9:18 am | |
| Xiaofan Chen | Jul 16, 2007 3:44 pm | |
| Hans Petter Selasky | Jul 17, 2007 5:55 am | |
| Xiaofan Chen | Aug 11, 2007 4:45 am | |
| Xiaofan Chen | Sep 22, 2007 3:47 am |
| Subject: | libusb usb_interrupt_read hangs under FreeBSD | |
|---|---|---|
| From: | Xiaofan Chen (xiao...@gmail.com) | |
| Date: | Jul 13, 2007 10:32:53 pm | |
| List: | org.freebsd.freebsd-usb | |
On 7/9/07, Hans Petter Selasky <hsel...@c2i.net> wrote:
Perhaps what happens is that the "*pDst.bRam = _UCPU;" command clears the FIFO contents of the USB interrupt endpoint in addition to clearing the stall!?
If the sequence is like this:
Write to interrupt endpoint. Reply command is written to FIFO. Clear interrupt endpoint stall. There is no data to read, because the FIFO has been emptied as a part of the stall command.
Xiaofan Chen: Could you check the datasheet for the chip that is used, what the stall command actually does?
Sorry that I have three more questions: 1) What is the correct method to correctly respond to clear halt feature request in the firmware so that it can still recover from the stall?
2) For the host, how does it know that the buffer data is still correct if the buffer is not cleared?
2) What cause the stall to happen in the first place?
Xiaofan