data dose not received through USB in some cases

RE: data dose not received through USB in some cases

alireza sadeghpour — Fri, 26 Jul 2019 12:52:46 GMT

thanks, problem solved by calling app_usbd_event_queue_process in the while loop.

RE: data dose not received through USB in some cases

Vidar Berg — Thu, 25 Jul 2019 08:10:28 GMT

The HID example uses a scheduler from the USB library by default (APP_USBD_CONFIG_EVENT_QUEUE_ENABLE 1) which means the user callback will not be called from an interrupt context, and the app needs to periodically call app_usbd_event_queue_process() to process queued tasks. Also, the app scheduler is not preemptive. I.e., if you have placed your loop in a scheduled task, subsequent tasks will not be processed until your program exits the loop.

RE: data dose not received through USB in some cases

alireza sadeghpour — Wed, 24 Jul 2019 11:40:37 GMT

Thanks for your answer, actually i have a always loop in main function and as you implied usb packets successfully delivered in that case.

but in my case, i had defined "hid_user_ev_handler" function to receive HID packets like below:

APP_USBD_HID_GENERIC_GLOBAL_DEF(ctap_hid_generic,
                                FIDO_HID_GENERIC_INTERFACE,
                                hid_user_ev_handler,
                                ENDPOINT_LIST(),
                                fido_reps,
                                REPORT_IN_QUEUE_SIZE,
                                REPORT_OUT_MAXSIZE,
                                APP_USBD_HID_SUBCLASS_NONE,
                                APP_USBD_HID_PROTO_GENERIC);

and in function "hid_user_ev_handler" after receiving a usb packet i call function "Usb_Proccess_Command" in below manner to handle the command:

app_sched_event_put(NULL, 0, Usb_Proccess_Command);

and in function "Usb_Proccess_Command" i check the user presence with while loop. i expected that as i called function "Usb_Proccess_Command" with "app_sched_event_put", priority of "Usb_Proccess_Command" was lower than "hid_user_ev_handler". am i correct?

thanks

RE: data dose not received through USB in some cases

Vidar Berg — Wed, 24 Jul 2019 11:16:37 GMT

Hi,

Have you tried to place this code in your main loop? I'm wondering if maybe your code is called from another interrupt with equal or higher priority than the USB. Thus preventing the USB command from being processed by the app.