USB CCID class with nordic nRF52840

[Mohammad]

I am developing USB CCID driver class for nordic nRF52840. I used USB CDC-ACM class as reference and tried to implement for USB CCID. I have developed the device descriptor for it.

USB CCID class has 1 interface and 3 endpoints(1 for interrupt, 1 for bulk IN and 1 for bulk OUT). Now the windows is detecting as Microsoft Usbccid smart card reader(WUDF)

In modify the app_usbd_ccid_internal.h, i need to know modification to be done in 

1. class instance data (app_usbd_ccid_inst_t)

2. CCID class specific request handled via control endpoint (app_usbd_ccid_req_t)

3.  ccid context (app_usbd_ccid_ctx_t)

I have attached my app_usbd_ccid_internal.h file with tis for refrence.

app_usbd_ccid_internal.h

[Håkon Alseth]

Hi,

 

This is a windows feature, that you cannot fix in firmware.

See a similar issue here, just for the USBD_CDC_ACM: https://devzone.nordicsemi.com/f/nordic-q-a/52438/usb-cdc-uart-is-recognized-as-teensy-com-port

If you have another driver, you can manually update the driver, as described in the above link.

 

Kind regards,

Håkon

[Mohammad]

Hi Håkon,

This is not the answer for the issue i described above.

Pls check above issue i have described. 

[Håkon Alseth]

Hi,

 

I am sorry if I have misunderstood. From your text, I read that the windows driver enumeration (more specifically; the driver name) is the issue. Is that not the case? If not, can you please describe more in detail?

Kind regards,

Håkon

[Mohammad]

Hi Håkon,

I am developing USB CCID driver class which not exist in nRF52 SDK. 

Nordic guy (kenneth) refer me to use USB CDC-ACM class as reference for developing USB CCID class driver.

https://devzone.nordicsemi.com/f/nordic-q-a/38402/need-support-for-usb-ccid-using-nrf52840

I have modified all the USB CDC class files in order to detect as USB CCID. Files are,
1. app_usbd_ccid_types.h
2. app_usbd_ccid_internals.h
3. app_usbd_ccid_desc.h
4. app_usbd_ccid.h
5. app_usbd_ccid.c

I have successfully written the Interface and class descriptor for CCID and I have tested it. Now the windows shows correctly Microsoft usbccid smart card reader(WUDF).

Now I need to modify further more in order to finish the USB CCID class driver. So i need to know parameter details of

1. usb class instant data (app_usbd_class_inst_t) (Here class will be cdc or audio or msc or HID, in my case it is ccid, app_usbd_ccid_inst_t).

2. class context( app_usbd_class_ctx_t,  Here class will be cdc or audio or msc or HID, in my case it is ccid, app_usbd_ccid_ctx_t).

3. class specific request handled via control endpoint ( app_usbd_class_req_t,  Here class will be cdc or audio or msc or HID, in my case it is ccid, app_usbd_ccid_req_t).

I have attached my app_usbd_ccid_internal.h file for your refrence.(above)

[Håkon Alseth]

Hi,

Mohammad said:

Now I need to modify further more in order to finish the USB CCID class driver. So i need to know parameter details of

1. usb class instant data (app_usbd_class_inst_t) (Here class will be cdc or audio or msc or HID, in my case it is ccid, app_usbd_ccid_inst_t).

2. class context( app_usbd_class_ctx_t,  Here class will be cdc or audio or msc or HID, in my case it is ccid, app_usbd_ccid_ctx_t).

3. class specific request handled via control endpoint ( app_usbd_class_req_t,  Here class will be cdc or audio or msc or HID, in my case it is ccid, app_usbd_ccid_req_t).

Unfortunately, we do not have a document/guide specifically on how to create a own usb class.

The parameters you're asking for is defined in the USB CCID class itself, which you can find here: https://www.usb.org/sites/default/files/DWG_Smart-Card_CCID_Rev110.pdf.

To implement these into the USBD framework, I would recommend looking at the already present classes, and the documentation for USBD:

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_usbd.html?cp=6_1_3_60

 

Kind regards,

Håkon

[Mohammad]

Hi,

Thanks for your response.

Can you let me know how to receive the data from the specific endpoint.

[Håkon Alseth]

Hi,

 

When using app_usbd, see the event handler, in case of the cdc, cdc_acm_event_handler, case "APP_USBD_EVT_DRV_EPTRANSFER".

Kind regards,

Håkon

[Mohammad]

Hi,

Thanks for your response.

Can you specify your answer more clearly where i can refer in the cdc code for receive the data from endpoint.

For example, to send the data in endpoint(EP0), i use the following code,

ret_code_t ret;
nrf_drv_usbd_transfer_t transfer =
{
   .p_data = {.tx = p_data},
   .size = size
};
ret = nrf_drv_usbd_ep_transfer(NRF_DRV_USBD_EPIN0, &transfer);

As per your above statement, once the NRF_DRV_USBD_EVT_EPTRANSFER event is generated, it calls cdc_acm_endpoint_ev where the type of endpoint is check.

If it is bulkout endpoint, cdc_acm_rx_block_finished is called once the NRF_USBD_EP_OK is OK.

But i need to know how to copy the data from the endpoint.