Why cannot properly see opcodes on memory browser ?

[elypheldia]

I can see the addresses when I hover over them, but I can't see the opcodes. Is there a setting to fix this or is it broken? 

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

Waiting for debugger connection...

Debugger connected

Waiting for debugger connection...

-------------------------------------------------------------------

STM32CubeProgrammer v2.16.0

-------------------------------------------------------------------

Log output file: C:\Users\Shichaz\AppData\Local\Temp\STM32CubeProgrammer_a18664.log

ST-LINK SN : 0671FF575377524867053453

ST-LINK FW : V2J45M30

Board : STM32F4DISCOVERY

Voltage : 2.91V

SWD freq : 4000 KHz

Connect mode: Under Reset

Reset mode : Hardware reset

Device ID : 0x413

Revision ID : Rev Y

Device name : STM32F405xx/F407xx/F415xx/F417xx

Flash size : 1 MBytes

Start Address : 8000000

Device type : MCU

Device CPU : Cortex-M4

BL Version : 0x91

Memory Programming ...

Opening and parsing file: ST-LINK_GDB_server_a18664.srec

File : ST-LINK_GDB_server_a18664.srec

Size : 4.93 KB

Address : 0x08000000

Erasing memory corresponding to segment 0:

Erasing internal memory sector 0

Download in Progress:

File download complete

Time elapsed during download operation: 00:00:00.372

Verifying ...

Download verified successfully

[Tesla DeLorean]

Which STM32 ?

Erased FLASH, or content expected?

[elypheldia]

I am using the STM32F407-DISC and trying to see the content of memory. I am a newbie so sorry for missing info.

[Tesla DeLorean]

Suggests this is a connectivity issue with the ST-LINK/V2 on the STM32F407-DISCO, make sure it has most current firmware. Check it is readable in STM32 Cube Programmer

The F4 doesn't have ECC (error correction / checking) so reading blank memory shouldn't fault, which could be the case for H7 parts, say. Those devices might reflect unreadable memory with '????' displays.

[elypheldia]

Thanks a lot. After your suggestion, I tried a different USB port on my computer. It works now.

Edit: It returned to the "????????" view. I tried all the USB ports of the computer.

[AScha.3 · Accepted solution]

Just to mention : memory can only be read, when debug stop core, at a breakpoint or click "suspend" .

While running, only last readed values or "????" shown.

[elypheldia]

Yes, I found out later that I was trying to read without clicking "suspend" (embarrassing :d). Thanks for the answers.