How to Run DTM on nRF52840 development kit using MT8852B?

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Alan Soc — Fri, 22 Feb 2019 08:57:05 GMT

Hi,

Blue trace is Tx (P0.6 = TP6 ) from nRF52832 mounted on a PCA10040 evalkit.

Yellow trace is Rx (P0.8 = TP8).

I'm using a FTDI cable (USB/uart TTL converter) between the MT8852B and the kit.

MT8852B is configured as "Source" = USB -> BLE2wire.

By pressing "EUT reset" (first response from the kit) and then "Update", tester finally displays an address (0x000000000000) and and I can run BLE scripts or single tests.

Best regards.

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Fri, 22 Feb 2019 00:09:42 GMT

Hi Alain,

Is good to hear that you making it successfully. I assume the yellow line is the Rx and the blue line is the Tx, but did you manage to obtain the DUT address from the bluetooth test set MT8852B ? If yes, can you share with me how you do that ? Are you using nordic development kit PCA10056 ?

Best regards,

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Alan Soc — Thu, 21 Feb 2019 16:20:18 GMT

Hi Håkon,

Now it works. I reloaded the DTM software and it sends only the two awaited bytes (0x00 00) as an answer (trace 2).

Kind regards

Alain

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Thu, 21 Feb 2019 12:16:31 GMT

Hi,

It sounds like the DTM answers the tester, given that you see a new response after 4 ms.

Are you still seeing issues connecting with the anritsu?

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Alan Soc — Fri, 15 Feb 2019 10:31:10 GMT

Hello Håkon,

I'm facing the same issue as "New Guy" with the Anritsu tester and a nRF52832 devkit (straps SB23 and SB25 are cut and Tx and Rx are collected on TP6 and TP8 : P0.6 and P0.8)

I observe the same signals on the scope. What is strange is that the response from the DTM software (the lower trace on the scope) is composed of 2 bytes at 19200 bds (1.04 ms) followed by two other bytes approximately 4 ms after. But according to DTM BLE spec (Vol 6 Part F chapt. 3.4), the answer should be only 2 bytes.

When readind the code of DTM main.c, only two bytes are sent back by the chip at the end of the for loop :

if (dtm_event_get(&result))
{
// Report command status on the UART.
// Transmit MSB of the result.
while (app_uart_put((result >> 8) & 0xFF));
// Transmit LSB of the result.
while (app_uart_put(result & 0xFF));

Do you see where these two other bytes could come from ?

Thanks.

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Mon, 28 Jan 2019 07:43:24 GMT

Hi,

All lines and responses (I cannot see the actual bytes going in/out) seem to be good.

Can you send a picture of the anritsu PC setup? It is crucial that you are connecting with "Ble2Wire" and not any other mode.

Some times I have seen issues connecting, where a reboot of the anritsu has solved the issue.

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Fri, 25 Jan 2019 01:59:19 GMT

Hi,

Please see below signal.Yellow is probing at Rx (p0.26) while green is probing at Tx (p0.27). below signal is when i press to obtain the EUT address on Anritsu.

best regards,

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Thu, 24 Jan 2019 15:50:12 GMT

Hi,

[quote user="New Guy"][/quote]

Maybe there is some setting i need to modify from the Anritsu?? Current setting as below:

- baud rate : 19200

- parity: none

- data length: 8 bits

- stop bits: 1 bits

- handshaking: none

These settings are good.

Did you try the other one with different GPIOs to see if this works better?

TXD should be high from the nRF (ie: P0.27), while RXD should be low (or pulled high when connected to PC). Could you verify this?

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Thu, 24 Jan 2019 00:46:49 GMT

Hi,

Thanks again for the hex file, but still unable to communicate with the Anritsu. It show me "EUT disconnected" & "Warning: EUT control (0x56)" when i choose the rs232 (my level shifter is rs232 protocol) and ble2wire as the source.

Just fyi, my setup is no problem because I tried the same setup with my previous project and it works !!

Maybe there is some setting i need to modify from the Anritsu?? Current setting as below:

- baud rate : 19200

- parity: none

- data length: 8 bits

- stop bits: 1 bits

- handshaking: none

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Wed, 23 Jan 2019 08:18:48 GMT

Hi,

Have you tried compiling the project "direct_test_mode" with other pins? Here's another prebuilt .hex with P0.26 (RXD) and P0.27 (TXD): devzone.nordicsemi.com/.../nrf52840_5F00_xxaa_5F00_dtm_5F00_p026_5F00_p027.hex

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Wed, 23 Jan 2019 01:54:40 GMT

Hi,

The problem still there... =.=

Here is how the connection between the DK board and the Anritsu tester.

(Level shifter board)

BR,

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Tue, 22 Jan 2019 08:34:32 GMT

Hi,

As stated in the answer; DTM and the SoftDevice cannot be enabled at the same time, as they both require the usage of the RADIO peripheral.

If you have a BLE example, and want to add DTM, you have to ensure that the softdevice is disabled when entering DTM, and vice versa when using the SoftDevice.

The "direct_test_mode" (DTM) project is standalone and does not require the softdevice.

Do you still have issues connecting to your bluetooth tester? If yes; could you post info/photos as asked in my former question?

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Tue, 22 Jan 2019 04:21:21 GMT

Hi,

i saw in an old post where you mentioned the softdevice has to be disable then only run the DTM. is this softdevice implemented in the dtm.c file ?

you can find the old post here: https://devzone.nordicsemi.com/f/nordic-q-a/33236/52840-dtm

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Fri, 18 Jan 2019 14:38:27 GMT

Hi,

Did you connect the GPIOs P0.20 (RXD) and P0.21 (TXD) to your bluetooth tester? Could you post a photo of your setup?

If you want to use other GPIOs, you can modify the example as I posted in my initial reply.

[quote user="New Guy"]is this a reason why there is no return from the board??[/quote]

If you have cut the solder bridges, and you're using the default GPIOs, then they will be cut.

By switching the GPIOs to any other free GPIO, you need to manually connect these to your UART adapter.

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Thu, 17 Jan 2019 10:25:43 GMT

Hi,

I tried again using nrfjprog command tool and segger embedded studio to do programming. The LED on the board is able to blink when i flashed with the example code for led blinking; but it still not able to communicate with anritsu tester after i flashed it with the dtm (examples file) and also your file is not working.

I noticed above statement from the user guide. It said about U5 & U6 break the connection of the UART, is this a reason why there is no return from the board??

best regards,

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Tue, 15 Jan 2019 14:11:47 GMT

Hi,

1 and 2.) No need to program the softdevice. Use nrfjprog from the command line:

nrfjprog -e && nrfjprog --program path\to\dtm.hex --reset

3.) You shall use BLE2WIRE and connect the RXD/TXD to pins P0.20 and P0.21. "RS232" is for classic BR/EDR bluetooth testing.

4.) As long as the nRF is powered up and the debugger is connected, it should be fine. Please see the nRF52840 user guide for more details on what the different switches do.

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Tue, 15 Jan 2019 09:28:32 GMT

Hi,

Thank you for the .hex file, the P0.20 is Tx ? P0.21 is Rx ?

There is an error during flashing the hex file into my nRF52840 development kit. Below is the error pop out when I tried to flash my board using nRFgo Studio.

Then i used J-Flash Lite v6.40 to do flashing, and the program shows me the flashing is completed. However, I still failed to get the address on MT8852B.

Here are some questions from me:

1. i need to flash softdevice first then only can flash the application software?

2. why i the flashing result is "completed" when using J-Flash Lite? and, it is really flashed?

3. on the Anritsu MT8852B, i tried both BLE2WIRE & RS232 to get the address but none on them working. I assumed there is no UART communication between Anritsu and DUT.

4. i noticed there are few supply port on the nRF52840 DK board. what is your configuration about that to make it works ?

TQ, looking for your advice..

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Tue, 15 Jan 2019 08:07:00 GMT

Hi,

The pins P0.06 and P0.08 are still connected to an unpowered IC if you only power via the "nRF USB" connector, which would sink current through the unpowered IC.

Here's a modified DTM (from SDK 15.2) with P0.20 and P0.21 used: devzone.nordicsemi.com/.../nrf52840_5F00_xxaa_5F00_dtm_5F00_p020_5F00_p021.hex

Could you try these pins and see if that works better?

Kind regards,

Håkon

RE: How to Run DTM on nRF52840 development kit using MT8852B?

New Guy — Tue, 15 Jan 2019 01:18:31 GMT

hi Hakan,

regarding the Rx & Tx pin, if i only use the J3 usb port as the power source to the nRF52840 chipset, could this good enough to avoid the conflict as you mentioned?? in this case, do i still need to redefine the pin in the main.c file ??

Another thing, i am using the dtm/direct_test_mode_pca10056.hex file instead of the dtm/main.c file as the source for the test. any different between them?? kindly advice if i am using the correct source code..

RE: How to Run DTM on nRF52840 development kit using MT8852B?

Håkon Alseth — Mon, 14 Jan 2019 14:42:25 GMT

Hi,

In order to get DTM running on any bluetooth tester, you would need to use other RXD and TXD pins when using the nRF5x development kit. This is because the UART is by default routed to the SEGGER IC on the devkit, so you will get two UART hosts conflicting the lines.

If you go into the dtm/direct_test_mode/main.c file, you can change the defines for RXD and TXD in function uart_init().

After changing these from the default GPIOs P0.06 and P0.08 (flip the kit over to see which GPIOs are unused), you can connect the chosen GPIOs to the bluetooth testers UART. Remember to use BLE 2-Wire when connecting to the Anritsu.

Kind regards,

Håkon