I find when i load .img file, after some time, firmware receive SUSPEND event. Could somebody kindlly tell me why?

Regards!

Thanks!

It means a suspend condition was detected on the USB lines.

Please provide more information on this scenario that you're facing

Device enumerates/does not enumerate? Device works for so and so time and then this event is received? etc

Regards,

Anand

Thanks aasi！

I want to reappear SUSPEND event，but i failed. I will  show details when i reappear this case.

But I find an other problem. Could you kindly explain this case. 

My firmware is almost same as syncfifo project, fpga produce data to fill fx3's slave fifo, i only use  P2U channel to auto commit to an IN EP. 

CASE 1:  when i load img to ram, after device  enumerates successfully, i don't do any operation, after a time, i find CY_U3P_USB_EVENT_RESET arrived, then CY_U3P_USB_EVENT_SET_SEL, CY_U3P_USB_EVENT_SETCONF events follow. i can hear dingdong like device disconnect, but it's really reset not disconnect. i can also read data from device by application runing on PC.

CASE 2: when i load img to ram, after device  enumerates successfully, i run my application to read data, after a time( this interval is shorter than case 1, and more  frequently), i find CY_U3P_USB_EVENT_RESET arrived, then CY_U3P_USB_EVENT_SET_SEL, CY_U3P_USB_EVENT_SETCONF events follow. i can hear dingdong like device disconnect, but it's really reset not disconnect.

also, I find when CY_U3P_USB_EVENT_RESET event come i call CyFxSlFifoAppInStop, and when CY_U3P_USB_EVENT_SET_SEL come i call CyFxSlFifoApplnStart, the device will dead. but when CY_U3P_USB_EVENT_RESET event come i do nothing, and  when CY_U3P_USB_EVENT_SET_SEL come i call CyFxSlFifoApplnStop, then CyFxSlFifoApplnStart, the device is still active. Is there difference?

Regards!

Thanks!

I  reappear SUSPEND event,  when i load img to ram, after device  enumerates successfully, i don't do any operation, after a time, follow events come in sequence:

CY_U3P_USB_EVENT_SUSPEND,

CY_U3P_USB_EVENT_CONNECT,

CY_U3P_USB_EVENT_RESET,

CY_U3P_USB_EVENT_SPEED,

CY_U3P_USB_EVENT_RESET,

CY_U3P_USB_EVENT_SPEED,

CY_U3P_USB_EVENT_SETCONF.

after these events, my device become  High speed, before is super speed. Please kindlly tell me which can cause suspend happen? hardware, firmware or device driver?

Regards!

Hi,

Are you using the DVK or a custom board?

Regards,

Anand

Anand, Thanks for your reply.

I used my custom board which refer to DVK. 

Regards.

mike

Please look at http://www.cypress.com/?docID=33570 and see if you're conforming to the recommendations. Looking at your description it seems the signal quality isn't good so the host is reverting the device back to high-speed.

Regards,

Anand