topic Re: do floating point supported in mc912zvca192 in S12 / MagniV Microcontrollers

do floating point supported in mc912zvca192

sathishkannan — Wed, 18 Nov 2015 05:12:35 GMT

Hi I checked floating point program but its showing error

#include <hidef.h> /* for EnableInterrupts macro */

#include "derivative.h" /* include peripheral declarations */

#include "math.h"

void main(void) {

EnableInterrupts;

/* include your code here */

float a=4.5;

float b=5.5;

float c;

c=a+b;

for(;;) {

__RESET_WATCHDOG(); /* feeds the dog */

} /* loop forever */

/* please make sure that you never leave main */

}

how to correct this code to check floating point operations?

i need to do natural log calculations also for below mentioned expression will it possible ?

#define A1 -13.4088568

#define B1 4547.9615

#define C1 -176965.92

#define D1 3861154

#define R25 10000 //10KOHM

#define R1 1000 // 1KOHM

//To Find Rt

Rt = {(4096/ADC)-1}*R1

//and To Find Temprature T

RtR25 =Rt/R25

result1 = log(Rt);

result2 = log(Rt)*log(Rt);

result3 = log(Rt)*log(Rt)*log(Rt);

//TEMP_KELVIN =1/(A1+B1+ln[Rt/R25]+C1ln2[Rt/R25]+D1ln3[Rt/R25]) (ln-natural log)

TEMP_KELVIN =1/(A1+B1+result1+(C1*result2)+(D1*result3))

TEMP_DEGREE=TEMP_KELVIN+273

Re: do floating point supported in mc912zvca192

RadekS — Fri, 20 Nov 2015 15:34:49 GMT

Hi Sathish,

When you create new project, you could select type of Float/Double type implementation.

Appropriate ANSI IEEE-754 Floating Point Library will be linked with your project.

I hope it helps you.

Have a great day,
RadekS

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------

Re: do floating point supported in mc912zvca192

sathishkannan — Thu, 26 Nov 2015 07:37:56 GMT

thanks,

i am already running a non float type project.i need to change the option to support float points,how to change in between of projects. ?

Re: do floating point supported in mc912zvca192

RadekS — Thu, 26 Nov 2015 14:55:45 GMT

Hi Sathish,

Please add the right ansi library.

Under Settings + S12Z Linker + Input, the Libraries (see picture above) you must change the lib file used.

\CW MCU v10.6.4\MCU\S12lisa_Support\s12lisac

The readme.txt will provide more info to select the right lib file.

I hope it helps you.

Have a great day,
RadekS