Changes to usbd_cdc_acm example to make it work with S140 Soft device and ble_app_uart_c example

[Steven Grunza]

I am using SDK 15.2 with IAR's EWARM 8.30.1 and the nRF52840 Development Kit.  My eventual target is the nRF52-Dongle.  If it matters my development OS is Windows 7 64-bit.

I have been trying to combine the usbd_cdc_acm and ble_app_uart_c examples.  I copied what I thought were the necessary parts of the usbd_cdc_acm project into the ble_app_uart_c example but the CDC interface does not show up on the PC.

The BLE part of the project seems to work fine and connects to my custom hardware.

I cannot find what part of the USB related code is not working properly.  All the return codes are success.

There is a parameter in the sdk_config.h file called "APP_USBD_CONFIG_POWER_EVENTS_PROCESS"  which I have set to either 0 or 1 and still had no success.

Can anyone provide a guide as to what should be done to bring the non-softdevice usbd_cdc_acm example into the S140 based ble_app_uart_c example?

This really seems like an example Nordic should provide.

[Susheel Nuguru]

Hi Steven,

This is a bit difficult for us to answer as we have not tried to combine these two examples together.

You are more likely go get helpful answers in the forum,  if you manage to narrow down a bit deeper into the "not working" part. Maybe there are some pin conflicts between uart and usb? just a wild guess.

[hmolesworth]

Have a look at this BLE Central project, since I think it has what you are looking for; I tested this on the nRF52840 Dongle:

.\nRF5_SDK_15.2.0_9412b96\examples\peripheral\usbd_ble_uart\

[Steven Grunza]

The example mentioned is a BLE peripheral project.  If it was the Central side then that would be exactly what I need.  Note that it sets up advertising (a peripheral function) and calls the nrf_ble_gatt_att_mtu_periph_set() function instead of the nrf_ble_gatt_att_mtu_central_set() functon.

[hmolesworth]

I did a diff between the usual Central and Peripheral uart code then used that to modify the main.c code in the example mentioned (15.0.0 I think); I found the USB serial link was not as stable as I hoped, but I don't remember the details offhand and that issue may have been related to the recent posts on 64-byte transfers. If I find the file I will post it, but it wasn't captured in our repository being just a test.