Hi Tam=E1s,
this is your 3rd message, you are not a beginner! So, please, start to use
correctly the subject of messages!
Thanks


On 06/11/2014 11:41, Tam=E1s Fekete wrote:
> Hi everyone!
> I am not sure if this problem is related to this topic. But I don't know
> where else it would fit.
>  I am using a dspic33fj128mc802 with mplab xc16 compiler. I have to read
> data from an ADC at about 1ms intervals. The data that I get is a floatin=
g
> point number.
The data that you WANT maybe floating point,
the data that you get from ADC is an integer number.

>  I convert this number into a string using the function
> sprintf. Send out the string. At the PC side I receive and save the data
> with putty.exe. Then save the session in a .dat file. I can use this .dat
> file with matlab to plot the results.
>
> The problem is that sprintf really slows down the process. I should be
> taking samples at about 1ms intervals and because of the sprintf function
> this is between 5-7 mseconds. I checked this with an oscilloscope and
> without the sprintf function I can get down to even less than 1ms interva=
ls
> easily.
Do not convert the integer but transfer it as is: do the computation where =
you
have computational power!

>
> If anybody could suggest a faster way to make a string out of a floating
> point number or another way to send and receive the data I would be very
> thankful.
You can convert the ADC data in a 4 chars string using hexadecimal notation=
..

>
> Cheers
> Tomi
>

--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.