//Sending "YES" to Hyperterminal (or Tera Terminal) via Serial COM0 (SCI0) on Project Board
//Modfied from Example 10-3 in HCS12 textbook by Mazidi & Causey


//On the Project Board, we have a serial COM port with DB-9 connector.
//The Serial COM port on Project Board is connected to the TX0 and RX0 (SCI0) of HCS12 permanently via a MAX232-compatible chip
//Serial COM PORT on Project Board is accessible by the HCS12 MCU Module via jumper called COM_SEL. 
//The COM_SEL jumper is located in front of the DB-9 connector and allows the MON08 or COM selection..
//MAKE SURE the jumper is set for the COM instead of MON08 in the COM_SEL jumper of Project Board before running this program.
//MAKE SURE 4 jumpers for COM_EN on the Project Board are also set. The COM_EN jumpers are located next to DB-9 connector.   

//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 SerTx0(unsigned char);

void main(void) 
{
  /* put your own code here */
 
                    
    SCI0BDH=0x00;   //XTAL=4MHz  
    SCI0BDL=13;     //4MHz/2=2MHz, 2MHz/16=125,000 and 125,000/9600=13 
    SCI0CR1=0x00;
    SCI0CR2=0x0C;
    for(;;)
      {
        SerTx0('Y');
        SerTx0('E');
        SerTx0('S');
        SerTx0(' ');
        
      }

}

 
void SerTx0(unsigned char c)  //SCI0 (COM0 of HCS12 chip)
  {
    while(!(SCI0SR1 & 0x80));  //make sure the last bit is gone
    SCI0DRL=c;		       //before giving it another byte	
  }