Posted by Norlander on 2018-04-26 09:32

Hi adi,

Lookng at your screenshot it seems that you dont have very many events happening from an SWV point of view. Just ITM0, DWT0 and time stamps. From where is the variable “value” written? Is it possible that this is done very frequently from some interrupt not visible in your code snippet above?
What I am asking is if you see that you get a lot of overflows? You can see the overflow count in the view called “SWV Trace log”, down left corner if I am not mistaken.

Could you also show us how your printf looks? Maybe Atollic run-time libraries differ from VisualStudio. In TrueSTUDIO you will need to bring in “tiny_printf.c” this function calls “_write” function. “_write” stub is available in the file called “syscalls.c”. You need this one too, and there you need to instrument _write to call ITM_SendChar. Before that is done “printf” is not directed to ITM0.
These two c-files can be added to your project by File - New - Other - filter for the “syscalls” or “printf”. Put them in src folder.

Does that solve the problem?

Posted by adi1525 on 2018-04-26 09:57

Thanks for answer.
My _write function in syscalls is
int _write(int32_t file, uint8_t *ptr, int32_t len)
{
int i=0;
for(i=0 ; i < len ; i++)
ITM_SendChar((*ptr++));
return len;
}
My “value” variable is global and there is only written 50. I don’t need printf for now, I try only write single character via ITM_SendChar().
I don’t have interrupt enabled.
This is my SYS configuration:

When I disable time stamps and ITM0 there is still the same problem. LED blinking and get “AD” only once.