Hello, I am using STM32F407 Discovery, and would like to send data to the computer without the USART cable (I am only using USB-MiniB cable).
So to view the voltage read by the ADC (of STM32F4) I use printf function, as follows:
int fputc(int c, FILE *stream) { return(ITM_SendChar(c)); }
printf(...)
Since I need to read then the voltage values on the computer (by matlab), how can I access the debug serial viewer? Or how can I retarget the printf function to write data in a txt file?
I tried also to use fopen,fprintf but it is not working.
Not sure I'm suggesting it is impossible, as someone with enough Windows coding skills and knowledge of the ST-LINK DLLs and protocols, could probably stream SWV (Serial Wire Viewer) output to a file. I'm sensing you're not that guy, and I've got much more practical solutions. One of the tricks to success is to pick the path of least resistance/complexity, not the one with the most.
The STM32F407 Discovery board doesn't not support a Virtual Serial Port via the ST-LINK connection (the mini USB), other ST-LINK firmware variations do, this one does not.
You could create a VCP using the primary USB connector of the F407 (the micro USB).