//Toggling PORTB in C Language for Dragon12 Plus Trainer Board 
//with HCS12 Serial Monitor Program installed. This code is for CodeWarrior IDE
//On Dragon12+ Trainer board 8 LEDs are connected to PORTB and 
//PTJ1 is used to allow LEDs of PORTB to show the data (See Page 24 of Dragon12+ Doc)
//Modified from Example 7-7 of Mazidi & Causey HCS12 book
//Use F7 to Make, F5 (Debug) to download, and F5 (Start) to run the program
//Make sure you are in HCS12 Serial Monitor mode when downloading and running. 

#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */


void MSDelay(unsigned int);
void main(void) 
{
  /* put your own code here */
  
    

    DDRB = 0xFF;    //PORTB as output since LEDs are connected to it
    DDRJ = 0xFF;    //PTJ as output to control Dragon12+ LEDs
    PTJ=0x0;        //Allow the LEDs to display data on PORTB pins
    for(;;) 			
      {
        PORTB = 0x55;
        MSDelay(500);    //1/2 sec delay
        PORTB = 0xAA;
        MSDelay(500);
      }
 
}

//millisecond delay for XTAL=8MHz, PLL=48MHz
//The HCS12 Serial Monitor is used to download and  the program.
//Serial Monitor uses PLL=48MHz

 void MSDelay(unsigned int itime)
  {
    unsigned int i; unsigned int j;
    for(i=0;i<itime;i++)
      for(j=0;j<4000;j++);    //1 msec. tested using Scope
  }