Debug string without printf

[Anonymous]

I would like to know if there is a way to print a debug string without using a printf. Adding a single printf increases the code size by 28KB! I can create the string with a small library that uses only a few KB and would like to send these strings to the debug interface.

On a separate note, I like VisualGDB for the following reasons:

1) Allowed download without registering an email address
2) Deliver on its promises: the LED on my custom STM32F103-based board started to blink a few minutes after the download
3) Apparently excellent support on this forum
4) Priced correctly.

I will turn my evaluation into a paid license this week!

[support]

Hi,

Please consider using the newlib-nano library. It significantly reduces the size of standard functions like printf(). Follow this tutorial for more details: http://visualgdb.com/tutorials/arm/newlib-nano/
If that does not work, you can download the newlib source code and copy the functions responsible for sending debug text using the semihosting API from there.

[bernardofca]

The Newlib-nano fixed the problem – thanks

[bernardofca]

I was actually too quick to answer: the Newlib-nano reduces the size of the code but the output does not go to the debugger window. I will need to fix that…

[support]

Hi,

Please try adding –specs=rdimon.specs to your LDFLAGS. This should explicitly include the library providing the debug I/O functionality.

Hi,

Please try adding –specs=rdimon.specs to your LDFLAGS. This should explicitly include the library providing the debug I/O functionality.

[Author]

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