//Sounding the Buzzer on PT0 using Chann 0 Timer (Output Compare option)
//PT0 of PORTT is connected to buzzer/speaker on Project Board
//Notice this is NOT using any Time Delay
//Modified by Mazidi from Example 9-29 of HCS12 book by Mazidi & Causey  

//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 using Channnel 0 of Timer and not time delay method. 


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

   TSCR1 = 0x90; 
   TSCR2 = 0x07;  //Prescaler=128. Change (0-7) to hear different sound
   TIOS = 0b00000001;   //Output Compare option for Channel 0
   TCTL2 = 0b00000001;  //Toggle PT0 pin option

  //Sound the Buzzer by toggling PT0 pin using Timer chan 0
   for(;;)
      { 
      Tcount = TCNT;
      Tcount = Tcount + 5000; //Also change the 5000 number to a differnt to hear different sound
      TC0 = Tcount;
      while (!(TFLG1 & TFLG1_C0F_MASK));
  
      }
 
}