//Toggling PORTT0 to sound the buzzer for Freescale Student Project Board Using HCS12 MCU Module  
//On Student Project Board, PT0 of PORTT is connected to buzzer/speaker permanently. It is accessed by BZ jumper. 

//MAKE SURE jumper for BZ (buzzer) is set. BZ JUMPER is part of group of jumpers called UFEA right next to the Buzzer itself 

//This program toggles PT0 to sound the buzzer. Change the delay size to get a different sound

//See Chapter 7 of Mazidi & Causey HCS12 textbook for bit manipulation in C programs.

//In CodeWarrior,Make sure you are in TBDML Mode before downloading 
//Press F7 (to Make), then F5(Debug) to downLOAD,and F5 once more to start the program execution
     
  
#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 */
  
       
    DDRT = DDRT | 0b00000001;    // PTT0 as output 
     
    for (;;) 			
      {
       PTT = PTT | 0b00000001;      //make PT0=1
      MSDelay(100);         //change the delay size to see what happens
       PTT = PTT & 0b11111110;      //Make PT0=0
      MSDelay(100);         //change delay size....

      }

}

void MSDelay(unsigned int itime)  //msec delay
  {
    unsigned int i; unsigned int j;
    for(i=0;i<itime;i++)
      for(j=0;j<311;j++);
  }