full featured sprintf() formatter?

MIOS programming (C)
1

I need to display floating point variables as I am experimenting with sensors of different kinds.

I find sprintf() is not formatting float types.

Is there a switch somewhere that controls the compile of stdio.h functions to include a full featured string formatter library?

Also is floating point math fully supported by default?

thanks

2

Floating point math is fully supported (libm is included)

But you don’t really want to use the original printf() routine - it requires liba for functions like _read, _write, _sbrk, etc… and as far as I remember, later it will ask for libos as well.

Thats unnecessary overhead (+ some implementation effort for the missing functions).

If you want to try to get it running: disable all functions in http://svnmios.midibox.org/filedetails.php?repname=svn.mios32&path=%2Ftrunk%2Fmios32%2Fcommon%2Fprintf-stdarg.c

Alternatively add the code for %f to the print() replacement

Or just do the conversion in your application, e.g.:

MIOS32_MIDI_SendDebugMessage("%d.%03d\n", (int)value, (int)(1000*value)%1000);
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Best Regards, Thorsten.
3

Works well, thanks TK!

Oh, and if negative numbers are possible use:

MIOS32_MIDI_SendDebugMessage("%d.%03d\n", (int)value, abs((int)(1000*value)%1000));

otherwise you get a negative symbol appearing in the fraction part.