nRF53 Direct Test Mode Question

[gfgf2400a]

Hi,

I followed https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direct_test_mode/README.html to work with nRF5340 DK PCA10095. I am using latest nRF connect v2.3.0 with no change of board "nrf5340dk_nrf5340_cpunet".

Because nrf5340dk_nrf5340_cpunet.overlay, ncs,dtm-uart is uart0 therefore I connect FTDI TTL-232R-3V3 to nRF5340 UART0 pins.

UART0		FTDI
TX	P0.20	RX	Yellow
RX	P0.21	TX	Orange
RTS	P0.18	CTS	Brown
CTS	P0.16	RTS	Green
GND		GND	Black

In prj.conf:

# Configure assertions

CONFIG_ASSERT=y

CONFIG_ASSERT_NO_COND_INFO=y

CONFIG_ASSERT_NO_MSG_INFO=y

CONFIG_HW_STACK_PROTECTION=y

# Uart driver

CONFIG_SERIAL=y

CONFIG_CONSOLE=y

CONFIG_UART_CONSOLE=y

CONFIG_LOG=y

CONFIG_LOG_PRINTK=y

CONFIG_USE_SEGGER_RTT=n

CONFIG_LOG_BACKEND_RTT=n

CONFIG_LOG_BACKEND_UART=y

# Use necessary peripherals

CONFIG_NRFX_TIMER0=y

CONFIG_NRFX_TIMER1=y

CONFIG_NRFX_TIMER2=y

It seems the example uart0 device tree is not configured correctly for this board and main.c !device_is_ready(uart) is true as shown in below screenshot. I used Teraterm with baudrate 19200 and I had no activity. Please let me know what could be the problem here. Thanks.

[Jared]

Did you build the sample unmodified this time?

I tried flashing the unmodified sample to my nRF5340 development kit with the latest NCS v2.3.0 and was able to run it and view it on RTT:

regards

Jared 

[gfgf2400a]

Jared,

I flashed the unmodified to nRF5340 DK PCA10095 and viewed from Visual Studio Code RTT terminal. I don't think viewing from J-Link RTT viewer should make any difference but I will try it.

Thanks,

[gfgf2400a]

Jared,

I built MS Visual Studio Code to build this DTM. Would this be a problem since https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direct_test_mode/README.html referenced to the command line?

I used and configured J-Link RTT viewer as you recommended. I still can't get the user interface as I expected. This is all I got from RTT viewer:

Should Nordic update the readme information here? https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direct_test_mode/README.html

I am expecting that the user interface is similar to what I saw from nrf52 several years ago. A single key allow the users to drive dtm test modes.

[gfgf2400a]

Jared,

I build dtm from the command line with "west build samples/bluetooth/direct_test_mode -b nrf5340dk_nrf5340_cpunet -- -DCONFIG_DTM_USB=y". I was able to see this RTT viewer:

I followed https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direct_test_mode/README.html#direct-test-mode-testing-app, section Connect with RealTerm (Windows) step 3, but I got nothing in the RealTerm: Serial Capture Program area 3?

[gfgf2400a]

The issue I am facing with DTM is direct-test-mode example does not work or does not work consistently with MS Visual Studio Code IDE. I won’t get to the issue at this point.

 I switched to the command line and I was able to see J-Link RTT as Jared mentioned. However my observations are:

1. J-Link RTT viewer is only displays the printk from the network core.
2. J-Link RTT viewer only works with MS Visual Studio Code IDE over SWD. If I reset the board, I won’t see anything because I am not using SWD.
3. From reading https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/bluetooth/direct_test_mode/README.html#direct-test-mode-testing-app, the user interface to send DTM commands (two-byte HEX numbers) has to be a serial terminal interface as you can see in section “Connect with RealTerm”. I was not be able to able to see anything over this JLinkCDC1 serial.

 I am still can’t get DTM application going. Please let me know if I am missing something here.

 Thanks for your helps in advance,