hi to all, i am emulating a usb floppy, and i decide to use keil usb middleware with custom class(usb floppies most implement ufi class and it dose not implemented by keil) to done this project, but i have a problem with that. in some place host driver decide to reset bulk in and out pipes, and as result it will reset host data toggle to DATA0 without sending any CLEAR_FEATURE to reset device data toggle. below table is part of usb communication dump of my device:
device-endpoint phase data desc 12.0 ctl 21 00 00 00 00 00 0c 00 control-setup 12.0 out 23 00 00 00 00 00 00 00 fc 00 00 00 control-data 12.2 in 00 00 00 08 00 00 0b 40 03 00 02 00 bulk-in 12.1 in 00 00 interrupt-in 12.0 ctl 21 00 00 00 00 00 0c 00 control-setup 12.0 out 00 00 00 00 00 00 00 00 00 00 00 00 control-data 12.1 in 3a 00 interrupt-in 12.2 reset reset bulk pipe 12.2 reset reset bulk pipe 12.0 ctl 21 00 00 00 00 00 0c 00 control-setup 12.0 out 03 00 00 00 12 00 00 00 00 00 00 00 control-data 12 SSTS timeout 12 SSTS request flushed 12 reset bus reset 12 ok
as you can see every thing is ok until host decide to reset bulk pipes and as result it reset host toggle but device toggle is DATA1 and as result next data transfer in bulk in endpoint will timeout and then host reset usb pipe and this is my problem. i know that this is mistake by host, but i know where host reset pipe and now i am searching for a way to reset data toggle of my device bulk endpoints. i did not find any function or utility in keil usb middelware api to reset data toggle. now any one know any way to done that???
You are right there is no way to reset the endpoint data toggle from user API.
There are 2 suggestions: 1. you should investigate why host resets the bulk endpoints as that usually means host has detected that something is not right, or is is not getting expected responses, so by addressing the problem you should prevent host from resetting the bulk endpoints 2. Write directly to your microcontroller's USB controller and reset data toggles
hi Milorad and thanks for response, i know why host try to reset pipes, ufi spec has command with opcode 0x00(test unit ready) and when host send this command to device, device must return an 2 byte status code to host, when there is no floppy in floppy drive device must sent 0x3A 00 in interrupt endpoint to indicate that there is no media in floppy drive(i see this in original floppy drive communication dump that i want to emulate)and after that host reset pipes and after that host sent another commands(because original floppy drive reset bulk toggle in this situation it work after that but i do not). now i think cmsis_usb_device driver must has any api to done that, i am going to test that.
What is your response on bulk IN endpoint on Host requesting TestUnitReady on bulk OUT endpoint?
As ufi specifications specified TestUnitReady command send only status on interrupt endpoint and do not need send anything on bulk in endpoint, and when i sniff original floppy drive(y-e data floppy drive), it act as i describe.
The only thing besides directly accessing USB controller is trying to stall and then un-stall the bulk endpoints (function USBD_EndpointStall) as un-stall should clear data toggle.