USB dongle nRF52840 USB CDC ACM receiving problem

RE: USB dongle nRF52840 USB CDC ACM receiving problem

Edvin — Mon, 03 Feb 2020 09:35:32 GMT

When you are debugging, does the event originate from cdc_acm_rx_block_finished() or cdc_acm_endpoint_ev() in app_usbd_cdc_acm.c? Are you always sending the same 64 byte packets?

What does your log look like? Can you try to enable APP_USBD_CDC_ACM_CONFIG_LOG_ENABLED (set it to one in sdk_config.h) and set APP_USBD_CDC_ACM_CONFIG_LOG_LEVEL to 4?

Best regards,

Edvin

RE: USB dongle nRF52840 USB CDC ACM receiving problem

Spartak — Fri, 31 Jan 2020 16:26:18 GMT

So I debug it. the main question is for me why sometimes I see 64 bytes of packet and sometimes I receive byte by byte

RE: USB dongle nRF52840 USB CDC ACM receiving problem

Edvin — Fri, 31 Jan 2020 14:49:44 GMT

Hello,

Please use the "insert" -> "Code" option when you want to attach source code, because this doesn't strip away indents.

How do you determine that you are missing events? You need to debug your application to see what's going on. Perhaps your application's error handler triggers, and the device reset. But in order to find out, you need to debug the application, or to use the log. The reason I suspect that you haven't done this is that you are using the dongle, which doesn't have a debugger. I suggest that you consider getting your hands on an nRF52840 DK for the development. When you have som software that it working, you can run it on the dongle.

Best regards,

Edvin