I also encountered the issue of 'Flash Download failed - "Cortex-M4"'

[tony55723]

Hi Nordic engineer,

I was able to flash before, but I reinstalled Keil5, J-Link, and downloaded Device Family Pack 8.24.1 and CMSIS 4.5.0 from the Nordic website. The SDK version is 15.3.0.

I really don't know how to solve this problem. Can you help me? Thanks

Note: I have three debuggers at hand, 5340 DK, 52840 DK, and a small package debugger given by someone else. The 52840 debugger did not respond when powered on, while the other two could be detected as J-Link and 52811 in Keil. I want to solve the issues with these two debuggers first before asking about the power-on problem with 52840.

[Einar Thorsrud]

Hi,

I don't see any obviously wrong in the settings in the screenshot. Are you able to program the device using nrfjprog or other tools? If not, is it so that you are using the debug out port on a DK to program an external board? If so, how have you connected it?

[tony55723]

Hi Einar Thorsrud,

I can program using J-Flash, but during this process, it will erase 52811. After programming （download）the application, you can return to Keil and program the application again. However, if you execute programming softDevice afterwards, you will no longer be able to program the application

Finally, after powering on, the module did not work properly (the Bluetooth indicator light did not blink)

Thank you

[Einar Thorsrud]

Hi,

There is no need to change these settings in Keil. However, Keil will not know about how to open up the debug interface on the latest revision devices, so if you have an empty device or a device that is flashed with firmware that does not open up the debug interface, you need to first do "nrfjprog --recover" from the command line using a fairly recent version of nRF Command Line Tools. With that, you should be able to program as normally (to be able to program multiple times and/or debug, you will also need the updated MDK).

[tony55723]

Hi Einar Thorsrud,

I feel a bit dizzy and I don't know what the problem is. I tried 4 different burning methods, but all of them failed.

1、nRF command line

2、nRFgo studio

3、nRF connect

4、keil download

Regarding the first point, it feels like the pack is not installed. It seems that Keil requires the installation of Device Family Pack.

Regarding the second point, it also feels like an issue with pack installation.

Regarding the third point, because I am using Windows 7, if I install version 4.0.0 or 4.0.1, the nRF Connect app will show a gray screen when opened. I can only install an older version and click 'Launch anyway', but then it will give an error.

Regarding the fourth point, the issue with Keil is still the same as before...

I don't know how to solve this problem. Can you help me, please?

Thanks.......

[Einar Thorsrud]

Hi,

nRFgo studio is legacy software and should not be used. It has not been maintained for a long time and does not know about the latest revision of the nRF52 series IC's.

For Keil, it is correct that you need to install the device family pack. This is always required when using Keil, and is done from the Pack Installer.

nRF Connect Programmer is the simplest GUI tool to use. I see from your screenshot that you have a version mismatch, though. Please install the latest version of nRF Connect for Desktop, including the bundeled J-Link drivers, and after that, ensure you have the latest nRF Connect Programmer app (within nRF Connect for desktop).

However, if you have basic problems with being able to program, I would start with nrfjprog from nRF Command line tools. This way you can easily see the debugger, connecting to the nRF and debug interface there works as expected. With that in place, move on.

For instance, does "nrfjprog --recover" seemingly work? Are you also able to program a hex file from there using "nrfjprog --program <filename>"? If so, the basics work and you can go back to looking at your Keil configuration (if the end goal is to get that working again).

[tony55723]

Hi Einar Thorsrud,

I'm sorry, I just replied to another question about PCB here

I have deleted it, but I still feel sorry

I searched for my agent and provided him with hex

He told me that the address should not start from 0x00

I don't know how this problem occurred, I haven't changed the address

I rolled back two versions of my own code, and after downloading the program, it worked fine

Additionally, I have installed nRF connect 4.0.0+

After opening the software, the screen appears gray

So I can only install the old version (3.8.0)

Is this related to the Win7 I am using?

Thank you

[Einar Thorsrud]

Hi,

I am glad to hear you got the error resolved.

Regarding nRF Connect, it seems likely that it is an issue with Windows 7. We do not test on Windows 7 anymore (and it is also no longer supported by Microsoft as of January 2023).