Is there anything special I have to do other than:

  FIFORESET = 0x80; SYNCDELAY;

  FIFORESET = 4; SYNCDELAY;

  FIFORESET = 8; SYNCDELAY;

  FIFORESET = 0x00; SYNCDELAY;

  EP8AUTOINLENH = (32) >> 8; SYNCDELAY;

  EP8AUTOINLENL = (32) & 0xff; SYNCDELAY;

  EP4FIFOCFG =             bmWORDWIDE;      SYNCDELAY;

  EP4FIFOCFG = bmAUTOOUT | bmWORDWIDE;      SYNCDELAY;

  EP8FIFOCFG = bmZEROLENIN |            bmWORDWIDE;      SYNCDELAY;

  EP8FIFOCFG = bmZEROLENIN | bmAUTOIN | bmWORDWIDE;      SYNCDELAY;

...to reset slave FIFO endpoints 4 and 8 and re-arm them? I'm trying to make my application robust against USB faults, and when I unplug the USB cable during operation, plug it back in, and reset the host program, I can't get data through endpoints 4 and 8. The above code is executed via a vendor-specific command before attempting to push data through the FIFOs. Everything works fine again after I hard reset the FX2, but after a USB fault of any kind I can't reestablish data throughput (control transactions via EP0/1 work fine), which makes me think something's not getting reset correctly. What else can I poke to clear the FX2's state properly?

Thanks,

Nick

 Hi Nick,

From your post, I am able to see only two endpoints. Is it that your application is using just two endpoints (4, and 8) or is it that you have posted only that part of code? You want to reset only EP4 and EP8? 

If it is that your application is using only just these two endpoints, then it is not a valid endpoint configuration. Endpoint configuration should be one among the 12 configurations as mentioned in section 1.18 in EZ-USB TRM, which you can find at C:\Cypress\USB\doc\FX2LP after you install FX2LP DVK (from http://www.cypress.com/?rID=14321)

What is happening after USB fault? Are the transfers failing? Pleas detail the behaviour seen. Please also arm the endpoints after you do FIFORESET (you  may use OUTPKTEND/INPKTEND to skip the packets in the buffer and thus arm them).

Regards,

Gayathri