printf to IDE console?

[Dave Nadler]

I'd like to be able to printf into IDE console during debug. I'm using Atollic 9.1, Nucleus F413 board with Segger debug programmed into onboard debug interface. I followed the instructions here:

http://blog.atollic.com/cortex-m-debugging-printf-redirection-to-a-debugger-console-using-swv/itm-part-1

Nothing happens when I printf: The debugger never hits a breakpoint in the modified _write in syscalls.

What am I doing wrong?

Thanks!

Best Regards, Dave

[Piranha]

You have to understand that You have multiple problems. I provided information for solving one of them. printf() not calling _write() is one problem and not being able to receive data sent by ITM_SendChar() is another completely separate problem.

As You have flashed J-Link firmware, You can try J-Link SWO Viewer from Segger. It is very simple and therefore easy to get to some functional starting point in using SWO pin.

[Dave Nadler]

At least 3 problems, as clearly listed above...

[PLang.4]

Hi Dave,

I had the same issue. printf works if I use some short string to print, not more then 5 characters approximately. Longer string cause error

seems there is unexpected use of malloc behind the call...

I found the help here:

https://www.freertos.org/FreeRTOS_Support_Forum_Archive/December_2016/freertos_sprintf_f_corrupts_stack_8fbac97dj.html

implement Your own malloc fanctions.

void *malloc( size_t xBytes )

{

return pvPortMalloc( xBytes );

}

void free( void *pvBuffer )

{

vPortFree( pvBuffer );

}

Peter