How to debug B-U585I-IOT02A board from STM32CubeIDE?

[stm7321]

Hi,

I'm trying to get started with the B-U585I-IOT02A board, and I have trouble to debug an application on the board.

So far I managed to do the following:

• Connected via USB to the CN8 USB port on the board to my Windows 11 machine.
• Tried the out-of-the-box B-U585I-IOT02A compiled demo binary, which works as expected.
• Updated ST-LINK firmware on the board via the STSW-LINK007 tool.
• Installed the ST-LINK USB driver on my Windows 11 machine via the STSW-LINK009 tool.
• Installed STM32CubeIDE Version: 1.9.0.
• Imported the example project IOT_HTTP_WebServer that is the source for the out-of-the-box application on the board.
• Made a small change to the application and built it in Debug mode.
• Used STM32CubeProgrammer v2.10.0 to upload the .hex file to the board.
• Verified that my change appears in the application.

So far so good. What I cannot get to work is uploading and debugging an application from STM32CubeIDE. I'm trying to do that with the IOT_HTTP_WebServer project.

So the first question is: Should it be possible to program and debug the B-U585I-IOT02A board over an USB cable that is attached to the "STLINK-V3E USB port (CN8)"? In the user manual it says:

"There are two different ways to program and debug the onboard STM32 MCU:

• Using the STLINK-V3E programming and debugging tool integrated on the B-U585I-IOT02A Discovery kit

• Using an external debug tool connected to CN9 MIPI‑10 connector"

I think that the first option refers to the CN8 USB port, but it is not 100% clear to me.

So assuming that this should work I tried to run or debug the IOT_HTTP_WebServer application by right-clicking the project in STM32CubeIDE Project Explorer and selecting "Debug as..." -> "STM32 Cortex-M C/C++ Application". In the "Edit launch configuration properties" dialog that pops up I leave all the default settings:

I can click on the ST-LINK S/N check box and click "Scan", and a serial number appears, so the connection appears to be working. I replaced the serial numbers manually with XXXXXX only for the screen shot.

When I then click ok I can see the the red LED next to the CN8 USB connector on the board flashes twice in green, and then an error message pops up with the text:

Error in final launch sequence:

Failed to start GDB server

Failed to start GDB server

Error in initializing ST-LINK device.

Reason: (0) Unknown. Please check power and cabling to target.

And in the Console view I see the following:

STMicroelectronics ST-LINK GDB server. Version 6.1.0
Copyright (c) 2022, 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
 
Failed to bind to port 61235, error code -1: No error
Failure starting SWV server on TCP port: 61235
Failed to bind to port 61234, error code -1: No error
Failure starting GDB server: TCP port 61234 not available.
Shutting down...
Exit.

The behavior changes somewhat when I select Debug probe "ST-LINK (OpenODC)" in the Debugger settings in the run configuration. When I run the application with this setting, the LED next to the CN8 port flashes for a longer time, and I see this in the Console view:

Open On-Chip Debugger 0.11.0+dev-00443-gcf12591 (2022-02-09-13:33) [ST Internal]
Licensed under GNU GPL v2
For bug reports, read
	http://openocd.org/doc/doxygen/bugs.html
clock_config
Info : Listening on port 6666 for tcl connections
Info : Listening on port 4444 for telnet connections
Info : STLINK V3J9M3 (API v3) VID:PID 0483:374E
Info : Target voltage: 3.327163
Info : clock speed 8000 kHz
Info : stlink_dap_op_connect(connect)
Info : SWD DPIDR 0x0be12477
Info : STM32U585AIIx.cpu: Cortex-M33 r0p4 processor detected
Info : STM32U585AIIx.cpu: target has 8 breakpoints, 4 watchpoints
Info : STM32U585AIIx.cpu: external reset detected
Info : gdb port disabled
Info : starting gdb server for STM32U585AIIx.cpu on 3333
Info : Listening on port 3333 for gdb connections
Info : accepting 'gdb' connection on tcp/3333
CPU in Non-Secure state
target halted due to debug-request, current mode: Thread 
xPSR: 0xf9000000 pc: 0x08001b80 msp: 0x200c0000
STM32U585AIIx.cpu TrustZone disabled
STM32U585AIIx.cpu work-area address is set to 0x20000000
Info : device idcode = 0x20016482 (STM32U57/U58xx - Rev X : 0x2001)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048kbytes
Info : flash mode : dual-bank
Info : device idcode = 0x20016482 (STM32U57/U58xx - Rev X : 0x2001)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : flash size = 2048kbytes
Info : flash mode : dual-bank
Info : device idcode = 0x20016482 (STM32U57/U58xx - Rev X : 0x2001)
Info : TZEN = 0 : TrustZone disabled by option bytes
Info : RDP level 0 (0xAA)
Info : OTP size is 512 bytes, base address is 0x0bfa0000
Info : New GDB Connection: 1, Target STM32U585AIIx.cpu, state: halted
O.K.
 
O.K.:0xE00FEFD0
 
Info : accepting 'gdb' connection on tcp/3333
target halted due to debug-request, current mode: Thread 
xPSR: 0xf9000000 pc: 0x08001b80 msp: 0x200c0000
Info : New GDB Connection: 2, Target STM32U585AIIx.cpu, state: halted
target halted due to debug-request, current mode: Thread 
xPSR: 0xf9000000 pc: 0x08001b80 msp: 0x200c0000
Info : Padding image section 0 at 0x0818b608 with 8 bytes (bank write end alignment)
target halted due to debug-request, current mode: Thread 
xPSR: 0xf9000000 pc: 0x08001b80 msp: 0x200c0000
Info : dropped 'gdb' connection
Info : dropped 'gdb' connection
shutdown command invoked

The application is then stopped with the following call stack:

Thread #1 (Suspended : User Request)	
	Reset_Handler() at startup_stm32u585aiix.s:62 0x8001b80	

When I resume the application, it continues for a few seconds and then STM32CubeIDE says the application has terminated, while the LED next to the CN8 USB connector keeps flashing in red and green.

What am I doing wrong here?

Thanks

Stephan

[LaurentL]

Hello,

You're are correct, CN8 is the USB connector for debugging. It is marked STLK as for STLink.

You don't need to specify the STLink Serial Number if you have only one board connected.

It is useful only if you have several STLink connected to your computer.

I tried to import this same example and I could debug it without issue with STLink gdb server or Openocd in version 1.9.0 on Windows 10.

I didn't change any debug settings.

The debug starts and is halted in HAL_Init() function in main.

Then, you can step or continue.

You can read the STM32CubeIde User Guide first.

Available in Help => Information center.

Then in "Read STM32CubeIde documentation"

If you need only to update your program, you can use a Run configuration that will only program the application.(or use STM32CubeProgrammer as you did).

If you need to debug the application, use a Debug configuration.

Rgds,

Laurent

[stm7321]

Hi Laurent,

thanks for trying it out and confirming that it should work the way I thought.

After your reply I retried it, and after many more attempts I finally found out that I had caused the problem myself. When I start the Debug session, in the console view I get the message "Waiting for debugger connection" and while the program is uploaded the debugger shows that the program is suspended in the "Reset_Handler" function:

I always pressed the "Resume (F8)" button because I had thought that the program should continue until it is actually supposed to stop in the "main()" function, but exactly this caused the error in the debugger launch sequence. If I don't press the "Resume (F8)" button and simply wait, then after the program is successfully uploaded the program resumes automatically. Then it stops at the HAL_Init() function in main, and everything works as expected.

Thank you

Stephan