I'm not an expert on XC16, but you could try something like

f =3D *(_Fract *) &i;

Or

* (_int *) &f =3D i;

This trick often lets you coerce datatypes like you are trying to do.

~ Bob Ammerman
RAm Systems

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Edson Brusque
Sent: Thursday, July 17, 2014 4:20 PM
To: Microcontroller discussion list - Public.
Subject: [PIC] Moving an uint16_t to _Fract in XC16

Hello all!

     I'm stuck in an strange situation. I've read the docs, googled a lot,
researched a lot and still haven't solved it.

     Please, let me explain with an example:

----
     uint16_t i;	// A 16 bit signed integer
     _Fract f;	// A 16 bit signed fractional

     i =3D 100;	// [i] is now 0x0064
     f =3D i;	// [f] is now 0x7FFF. I need it to be 0x0064.
----

     The actual application is getting values from an external ADC in signe=
d
int form and needs to move to a _Fract value to make use of fractional
arithmetics built in XC16. But the compiler is doing some conversion with
saturation.

     I just need the int values (-32768 to +32767) scalled to fractional
(-1 to +1). Actually, it's just copying the contents from one register to
the other.

     I can convert int to float and then make the conversion and scalling t=
o
_Fract but it's a lot of wasted CPU cycles.

     Anyone have any clues?

     Best regards!
--=20
     Edson Brusque
     Tim: (47)9938-3439

---------------------------------------------------------------------
Edson Brusque                                  www.BruschiAmps.com.br
Blumenau, SC, Brazil                                    (47)3232-0984
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