Cannot step past second instruction in disassembly window

RE: Cannot step past second instruction in disassembly window

Joakim Jakobsen — Mon, 13 Nov 2017 10:15:00 GMT

Hi MichealNordicUser.
Did you manage to solve the problem with the ble_app_multilink_central example?
From what I can see, you are using the SD 132v.5.0 with SDK 12.3? For SDK 12.3 you should use SD 132v.3.0.0.
Best regards.

RE: Cannot step past second instruction in disassembly window

MichaelNordicUser — Thu, 09 Nov 2017 22:06:30 GMT

Sorry, you were right. This solved my problem. I can get the UART example running now, however example C:\NordicSdks\SDK 12.3.0\examples\ble_central\ble_app_multilink_central\pca10040\s132\arm5_no_packs is suffering from the same problem I described in this question. Now the app will flash without the SD, but will not flash with the SD (v 132.5.0). According to the blog entry you posted, maybe the app maybe tries to overwrite the SD and causes this error.

RE: Cannot step past second instruction in disassembly window

AmbystomaLabs — Thu, 09 Nov 2017 20:35:54 GMT

And, I just went through the entire process myself. In nRFGo do an erase all and load the correct SD for your app/SoC. Then go to uVision, build the project and click "load". Then go into debug. The "load" may be optional as the code should load with the debug but the build is not optional as it doesn't think to build the project before entering debug.

RE: Cannot step past second instruction in disassembly window

AmbystomaLabs — Thu, 09 Nov 2017 20:31:02 GMT

It does not load the SD. You have to load it separately. The compiled code is just the app and does not include the SD.
Here is a blog entry almost identical to yours: devzone.nordicsemi.com/.../

RE: Cannot step past second instruction in disassembly window

MichaelNordicUser — Thu, 09 Nov 2017 20:00:50 GMT

I've addressed both of your concerns, but don't seem to have made any progress. I've added additional information in my post. Thank you.

RE: Cannot step past second instruction in disassembly window

AmbystomaLabs — Thu, 09 Nov 2017 19:30:00 GMT

Based on your graphic you didn't even make it out of the first instruction. The PC is still at 0x0. Also, according to the disassembly window it looks like memory is blank and nothing was loaded. I haven't used the debugger in uVision in a while but, from what I remember you have to set a few things to get it to load the code into flash for a debug session. In project settings, there is a debug tab where you setup the communications with your device. Make sure it is configured correctly. Then to test you will be able to flash from the main screen using the "load" button. That should solve your problem.

Or if it is the ble uart example you are referring to, that requires a soft device. The pc always goes to 0x0 on reset. So your code could be where it belongs it's just that you have never loaded an SD. The SD/MBR sit at 0x0 and take care of launching your app.