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;
}
