printf not working via ITM_Sendchar, _write never called

[hegde_08]

I am trying to use SWD for printing using ITM_Sendchar, Printf not calling _write, I tried to put breakpoint and see, But it is not hitting breakpoint

[KnarfB]

By default, stdout is line buffered. You will see output only after a newline '\n'. Less common: stdout buffering might be changed to unbuffered as well.

hth

KnarfB

[Andrew Neil]

welcome to the forum.

Please see How to write your question to maximize your chances to find a solution - particularly how to post source code (not as images).

See also: How to insert source code

As @KnarfB said, stdout defaults to line-buffered, so you won't see any output until a newline is sent.

This is also noted in the Knowledgebase article, How to redirect the printf function to a UART for debug messages.

See also: https://community.st.com/t5/stm32-mcus/how-to-redirect-the-printf-function-to-a-uart-for-debug-messages/ta-p/49865#:~:text=5.2.%20Line%2Dbuffering,has%20been%20formed - which includes how to disable the line-buffering.

Also Try: 

printf( "Hello World!\n" );

instead...

[hegde_08]

I just came here to give update, So _write is called, But now Even though I enabled SWD, and trace, and Port 0, Print is not working

[gbm]

Board type? (If ST.) Schematic? (If your own.)

[hegde_08]

STM32 , NUCLEO-F303RE