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How to display IEEE 754 in RS232

 
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hemnath



Joined: 03 Oct 2012
Posts: 227
Location: chennai

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How to display IEEE 754 in RS232
PostPosted: Thu Aug 06, 2020 6:03 am     Reply with quote

How to display the IEEE in RS232

Code:
#include "18F2520.h"
#fuses HS
#use delay(clock=12000000)

#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)

#include "ieeefloat.c"

float f;
int32 PCval;
int8 *p;

void main()
{
   while(1)
   {
      f = 0.0123;
      PCval=f_PICtoIEEE(f);
      printf("IEEE %Ld",PCval);

      printf("\n\r");
      delay_ms(1000);
   }
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Thu Aug 06, 2020 8:46 am     Reply with quote

Display how?.

If you want to print the fp value, then don't. Just print your variable 'f'.
If you want the hex values that the IEEE representation has, then just
print with &08x:

printf("IEEE %08x",PCval);

This then gives the hex digits corresponding to the IEEE value.
hemnath



Joined: 03 Oct 2012
Posts: 227
Location: chennai

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PostPosted: Thu Aug 06, 2020 11:10 pm     Reply with quote

I get this result, IEEE 000000f0

I guess, for float 0.0123, IEEE hex is 0x3c4985f0
PCM programmer



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PostPosted: Thu Aug 06, 2020 11:18 pm     Reply with quote

It has to be "lx", not "x". Then it will work.
hemnath



Joined: 03 Oct 2012
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PostPosted: Thu Aug 06, 2020 11:56 pm     Reply with quote

perfect. Thanks!

Is it possible to display the value in binary format?
PCM programmer



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PostPosted: Fri Aug 07, 2020 1:13 am     Reply with quote

Here is a routine to display a byte in binary format:
http://www.ccsinfo.com/forum/viewtopic.php?t=1523&start=1
Ttelmah



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PostPosted: Fri Aug 07, 2020 1:28 am     Reply with quote

Binary!...

You do realise you'll have 32bits for each number. Not exactly convenient to
do anything with....
You'd have to generate your own binary output routine. Not exactly hard:
Code:

void binary(unsigned int32 value)
{
    unsigned int32 mask=0x80000000;
    do {
        if (mask & value)
            putc('1');
        else
            putc('0');
        mask/=2;
    } while (mask!=0);
}
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