RE: [motoroladsp] fractional number

Frac16 and Fract32 are representations of the values +1.0 to -1.0 so to convert them to an integer, just multipy them by the range you wish to represent.

For example: to have a range of -100 to 100, multiply the Fractxx value by 100.

Another way to look at this is to think in terms of the following equation:
Fract = (integer value)/(maximum integer value)

So, multiplying a Fract16 by the maximum integer value yields the represented integer value.

If your range of integer values happens to be +32767 to -32768, then the Fract16 value is the corresponding integer value!!!

Jerry.

-----Original Message-----
From: bblaundry [mailto:b...@microwavedata.com]
Sent: Monday, March 01, 2004 1:17 PM
To: m...@yahoogroups.com
Subject: [motoroladsp] fractional number

Hello All,

I am having trouble working with fractions within my project. I am
using a DSP56F826 chip with Codewarrior tools.

I am trying to create functions that will convert fractional data
(Frac16 and Frac32) into int and long int data.

Does anyone know how to do this either in C or in assembly?

Thanks,

Brad

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Brad, Maybe you can use the following macros provided in SDK to assist you in the conversion from fractional to integer: #define FRAC16(x) ((Frac16)((x) < 1 ? ((x) >= -1 ? (x)*0x8000 : 0x8000) : 0x7FFF)) #define FRAC32(x) ((Frac32)((x) < 1 ? ((x) >= -1 ? (x)*0x80000000 : 0x80000000) : 0x7FFFFFFF)) and as an example you can use them as: UWord16 Int16 = FRAC16(0.25) UWord32 Int32 = FRAC32(0.75) Hope this helps. Best regards, Fabio Estevam -----Original Message----- From: bblaundry [mailto:] Sent: segunda-feira, 1 de mar de 2004 16:17 To: Subject: [motoroladsp] fractional number Hello All, I am having trouble working with fractions within my project. I am using a DSP56F826 chip with Codewarrior tools. I am trying to create functions that will convert fractional data (Frac16 and Frac32) into int and long int data. Does anyone know how to do this either in C or in assembly? Thanks, Brad _____________________________________ Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. _____________________________________ About this discussion group: To Join: To Post: To Leave: Archives: http://www.yahoogroups.com/group/motoroladsp More Groups: http://www.dsprelated.com/groups.php3 Yahoo! Groups Links

Hello All, I am having trouble working with fractions within my project. I am using a DSP56F826 chip with Codewarrior tools. I am trying to create functions that will convert fractional data (Frac16 and Frac32) into int and long int data. Does anyone know how to do this either in C or in assembly? Thanks, Brad