Programming my board worked fine for a long time, but then it started to fail with the error messages shown below but I could get it working again by closing the IDE (STM32CubeIDE) and unplugging the ST-Link/V2 then plug in and restart the IDE - but now I can't get it to program even once - so it was not a sudden failure, it was a gradual deterioration.
The IDE was updated at least once and the project was migrated before the failures started (I think).
I have tried installing the IDE on a virtual machine then recreating the project - didn't work.
Tried installing the IDE on another machine that had never had any ST stuff installed on it - didn't work.
Tried creating a new, small project - didn't work.
Interesting that installing the IDE on another machine doesn't reset the problem - I would have expected a new installation to not have the problem and that the problem might reappear as it did originally, but it doesn't - the problem is at the same stage of deterioration as it was in the original installation.
There is a second issue that may be linked - even if I get the program to download it hits an uninitialized pointer-to-function in the code generated by the IDE.
Here's the output that I get.
STMicroelectronics ST-LINK GDB server. Version 5.8.0
Copyright (c) 2020, STMicroelectronics. All rights reserved.
Starting server with the following options:
Persistent Mode : Disabled
Logging Level : 1
Listen Port Number : 61234
Status Refresh Delay : 15s
Verbose Mode : Disabled
SWD Debug : Enabled
InitWhile : Enabled
Waiting for debugger connection...
Debugger connected
-------------------------------------------------------------------
STM32CubeProgrammer v2.7.0-RC1
-------------------------------------------------------------------
ST-LINK SN : 54FF6A066684565521351687
ST-LINK FW : V2J37S7
Board : --
Voltage : 2.70V
SWD freq : 4000 KHz
Connect mode: Under Reset
Reset mode : Hardware reset
Device ID : 0x470
Revision ID : Rev Y
Device name : STM32L4Rxxx/STM32L4Sxxx
Flash size : 63 KBytes (default)
Device type : MCU
Device CPU : Cortex-M4
Memory Programming ...
Opening and parsing file: ST-LINK_GDB_server_a05820.srec
File : ST-LINK_GDB_server_a05820.srec
Size : 84064 Bytes
Address : 0x08000000
Erasing memory corresponding to segment 0:
Erasing external memory sectors [0 20]
File segment @0x08000000 is not 255-bytes aligned. It will be aligned to @0x07FFFFF8
Download in Progress:
Error: failed to download Segment[0]
Error: failed to download the File
Encountered Error when opening C:\ST\STM32CubeIDE_1.5.0\STM32CubeIDE\plugins\com.st.stm32cube.ide.mcu.externaltools.cubeprogrammer.win32_1.6.0.202101291314\tools\bin\STM32_Programmer_CLI.exe
Error in STM32CubeProgrammer
Debugger connection lost.
Shutting down...
