Setting Up DTM (Direct Test Mode) on nRF52810 based Taiyo Yuden module

[eurex]

My customer is using a Taiyo Yuden module, EYSLSNZWW, that uses the Nordic nRF52810 chipset.  We need to configure the board for Bluetooth Qualification testing.  I have read the Taiyo Yuden technical notes but its not particular clear on the hardware configuration steps and if special DTM firmware needs to be loaded on the nRF52.

Has anyone gone through the steps of configuring nRF52 for Qualification testing and if so are you happy to share information?

[ketiljo]

The DTM FW can be found in the SDK: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/ble_sdk_app_dtm_serial.html

You need to configure the UART pins, RX and TX, before you compile it. Depending on the type of tester you have, you need a RS232 to TTL converter or a UART over USB cable. 

Also see this appnote: https://infocenter.nordicsemi.com/pdf/nan_34.pdf

[eurex]

Thanks for your answer Ketiljo.

Seems like they have SWDIO and SWDCLK pins to enable the DTM firmware to be loaded.  Once they load the DTM FW it will remain as long as they don't flash again?

Regarding the UART connection to the Tester, they already have an MCU UART connection setup on their standard device, so I assume that if we check current FW to see Tx and Rx pin settings, we simply set the same in the DTM FW (and remove the physical connection to the MCU).  Then connect either via RS232 to TTL convertor or USB cable?

[ketiljo]

Yes, program the DTM over the SWD interface the same way as any other FW. Note that DTM replaces all normal functionality of the device. 

If you have dedicated UART pins, use those. Else it's fine to solder wires to any two free pins and use an external RS232 converter.