why pow() is not working in codewarrior?

khalidsakib — Fri, 09 May 2014 22:45:51 GMT

I like to turn on a specific 7-segment display (total 4 7segment display) in Dragon12 plus development board. I want to select a specific 7-segment display (out of 4) and light with a specific no. (here i am showing 6 (to show 6 i put 125(decimal) ). Now in the following program x1=2 (that means 1st 7-segment should be on and it works, (counted like 0th, 1st, 2nd and 3rd ) ) and shows 6 that i want to show . But I want to use x1=pow(2, ) . So when I used x1=pow(2, 1) it select the right 7-segment display but it does not show 6. instead it shows something wired (nothing meaningful in that 7segment display). WHY???

// Example 1a: Turn on every other segment on 7-seg display

#include <hidef.h> /* common defines and macros */

#include <mc9s12dg256.h> /* derivative information */

#include "math.h"

#pragma LINK_INFO DERIVATIVE "mc9s12dg256b"

#include "main_asm.h" /* interface to the assembly module */

void main(void) {

int s;

float b ;

float x ;

float x1;

PLL_init(); // set system clock frequency to 24 MHz

DDRB = 0xff; // Port B is output

DDRJ = 0xff; // Port J is output

DDRP = 0xff; // Port P is output

PTJ = 0x02; // disable LED 0x02

PTP = 0xff; // disable all 7-segment displays

PORTB = 0x00 ;

s =125;

b=1;

x1=pow(2,b);

x=15-x1;

PTP = x;

PORTB = s;

}

Re: why pow() is not working in codewarrior?

trytohelp — Fri, 16 May 2014 12:26:20 GMT

Hi Khalid,

I've created a project with the wizard for 9s12DG256B.

This example is using the Full Chip Simulator (FCS).

The pow instruction seems to be running fine.

Now I added a part of your code and for me it's running fine.

Attached the project and the debugger view.

Have a great day,
Pascal

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

topic Re: why pow() is not working in codewarrior? in CodeWarrior Development Tools

why pow() is not working in codewarrior?

Re: why pow() is not working in codewarrior?