Digital Signal ControllersのトピックRe: Exponential and natural logarithm calculation using MC56F84789

Exponential and natural logarithm calculation using MC56F84789

LuisWoll — Tue, 12 Mar 2024 10:53:00 GMT

Is there a official library for this kind of calculation for this DSP?

Tks

Re: Exponential and natural logarithm calculation using MC56F84789

xiangjun_rong — Wed, 13 Mar 2024 08:27:07 GMT

Hi,

I suppose it is okay to compute the exp function, it use software float library to compute the exp value.

For the CodeWarrior for MCU ver11.x tools, I use the following code, I can pass the compilation.

#include "math.h"

float f1,f2;

void main(void)

{

....

f1=1.0;

f2=exp(f1);

...

}

Pls have a try

XiangJun Rong

Re: Exponential and natural logarithm calculation using MC56F84789

LuisWoll — Thu, 14 Mar 2024 15:36:11 GMT

Tks, it works!

In addiction to that, i looked for a ln (natural based log) function but could not find anything on the math.h, is there a way to do that? Mayber calling a log that i can define the base and write it as exp(1)...

Re: Exponential and natural logarithm calculation using MC56F84789

xiangjun_rong — Fri, 15 Mar 2024 02:51:09 GMT

Hi,

Pls try to call:

float f1,f2;

void main(void)

{

f1=1.0;
f2=exp(f1);
f2=log(2.7);

...

}

Hope it can help you

XiangJun Rong