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[on:]

Hello to all,
excuse me for my question, I don't know if I can post it in this forum.

I am using Atmel Studio 6.1 to program Arduino Due and I would like to print a float number in a buffer.

Code:

If I write:
char bf [40];
int F = 1234;
sprintf (bf, "% d", F);

everything works fine and I find the integer number in the buffer "bf".
if instead I write

Code:

char bf [40];
float F = 1234.0;
sprintf (bf, "%f", F);

does not work and I don't find the float number in the buffer "bf" .

if I use Arduino IDE 1.5.2 everything works fine.
someone has a suggestion?
where am I wrong?

Best regards
Davide

[Reply #1 on:]

The sprintf used by the AVR's does not have float support, or many other sprintf features.

Here is a library I'm working on at the moment, there is a working 'GString' library which contains an sprintf function:    
String/sprintf alternative for Arduino.

However this requires the Print library, which you'll have if you use the Arduino core.

[Reply #2 on:]

Than you very much, it's exactly that I was looking for!
Very beautiful work, my compliments.
I thank you very much.
At the first test it seems to work very well.
Best regards.
Davide

[Reply #3 on:]

That is good to hear, I don't actually have a Due to do any testing, so your response was great. Cheers.

[Reply #4 on:]

Oops, I just realized now that I had made ​​a mistake and had not included your library but I printed an integer with sprintf of atmel, that's why it seemed to work!
I was too tired when I took the test.
when I have time I'll try again including your library. Thanks again and sorry for the error.
Davide

[Reply #5 on:]

No worries, there shouldn't be problems as the version you have does not include the eeprom or progmem code. I'm working on a print library extension that allows Serial.printf(). It is only AVR compatible at the moment as I build the functionality, but eventually I can mask off the AVR only bits and I'll have support for the Due as well.

You should be fine to use the GString.h, though.

[Reply #6 on:]

How exactly are you able to program the ARM chip through Atmel Studio? This is killing me.

[Reply #7 on:]

I use an add-in for Atmel Studio 6.1 called Visual Micro. I can program all my Arduino boards, including Due, using it.

Check it out (it is free)http://www.VisualMicro.com

Here is a screenshot