I don't know of any micro-controller that has floating point hardware support. Are there such? The telosb MSP chip doesn't even have int multiply or divide instructions. The mica Atmega has an 8-bit multiply but no divide.
With you, I always recommend fixed-point math. MS Sergio Valcarcel wrote: > Hi Malissa, > > Depending on the platform you are using, your CPU may accept float or > even double numbers. Also, depending on the architecture float > computations might be accelerated with dedicated hardware or not. > So the main points you have to verify is whether the extensively use of > float operations will decrease the overall performance of your system. > Of course, it is not the same to compute a numerical integration than to > average two numbers... > > Another main point is the memory footprint. Float numbers typically > could use 4 bytes. So you must take care of how much available RAM you > have for your application. > > A final concern is that you can not use network data types (i.e. > nx_struct) for communications since there is not defined a nx_float type. > > The other option, instead of using floats, could be to convert to > integer, scaling as many decimals you want. For instance, 165.32 could > be converted to 16532 (remembering that it is multiplied by 1e2). > > I hope it helps! > Sergio > > > On Sat, Sep 10, 2011 at 10:30 AM, Maissa Ben Jamaa > <maisa.benja...@gmail.com <mailto:maisa.benja...@gmail.com>> wrote: > > Hello sir, > > Please can I ask you a question: does using float number in a nc > code for real compilation matter? > > Thank you > > Best regards, > Maissa Ben Jamaa > > > 2011/9/9 Maissa Ben Jamaa <maisa.benja...@gmail.com > <mailto:maisa.benja...@gmail.com>> > > Hello sir, > > I am very thankful for your answer, I tried to do something > similar to blip code but I got the following error: > gcc: cannot specify -o with -c or -S and multiple languages. > Noting that I am now testing my code with Tossim. > > Best regards, > Maissa Ben Jamaa > > > 2011/9/8 Sergio Valcarcel <serteck...@gmail.com > <mailto:serteck...@gmail.com>> > > Dear Maissa, > > Please, check this thread: > > http://www.mail-archive.com/tinyos-help@millennium.berkeley.edu/msg36375.html > > It is pretty straight forward, but do not hesitate to mail > me if you need further help. > > Cheers! > Sergio > > > On Thu, Sep 8, 2011 at 5:12 PM, Maissa Ben Jamaa > <maisa.benja...@gmail.com <mailto:maisa.benja...@gmail.com>> > wrote: > > Hello sir, > > I saw your interaction in tinyos help about porting c > code with nc code. > here is the > link: > http://www.mail-archive.com/tinyos-help@millennium.berkeley.edu/msg38966.html > > Please can you tell me the steps to follow in order to > make this porting. > > Thanks. > > Best ragards, > Maissa Ben Jamaa > > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > Tinyos-help mailing list > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help _______________________________________________ Tinyos-help mailing list Tinyos-help@millennium.berkeley.edu https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
