i'm reading temp sensor value and store to SD card and my question is, it debugging successfully & if i run for 5 times only, it reads output from a sensor and storing to SD card 2.if I flash to the controller without Debugging, text file is not gene

[mrsmile]

..

[Tesla DeLorean]

Sounds like a coding or initialization issue.

Perhaps timing different without the debugger, or the debugger initializes something you later depend on.

If BOOT0 pin floats the chip may not start reliably.

No idea about your code, board, or STM32

Anecdotal descriptions are hard to diagnose.

With SDIO/SDMMC implementations with FATFS, start by debugging the low level DISKIO layer, failure at the top-level/application won't identify a cause.

[mrsmile]

thank you for your response sir.