//Testing Push Button (PB5-PB8) Switches on Student Project Board. 
//This program gets status of Push Button SW of PB5-PB8 and sends it to LEDs on PORTA 
//Using HCS12 MCU Module with Freescale Student Project Board  
//HCS12 MCU Modules come with USB-BDM and ready to be used with CodeWarrior IDE


//The lower 4 bits of PA3-PA0 are connected to LEDs(LED1-LED4 on J10) permanently
//and must be enabled by clearing bit P4 of PORTP. Also set the LED jumper on UFEA jumpers next to Buzzer
//We also need to connect 4 wires from LED5-LED8 (J10) to pins PA7-PA4 via J6 connector 

//See Toggling PORTA sample code for Student Project Board on this website.

//On Student Project Board, We need to 
//a)connect 4 wires from push button PB5-PB8(on J10) to pins PORTB3-PORTB0 of J6 connector (pins 47,49,51,53 of J6) 
//b)Notice on J6 of Project Board PORTB3-PORTB0 are pins 47,49,51,53,55

//On HCS12 MCU Module itself 
//a)MAKE SURE ALL jumpers for PORTB are removed (LED1-4 and SW3-1 to SW3-4).
//b)The 8 Jumpers (SW3-1 to SW3-4 and LED1-LED4) on HCS12 MCU module connect the PORTB to SW and LEDs of the Module itself  
//c)The PORTB can be either used by the HCS12 MCU Module itself or the Project Board, but not both of them at the same time.            

          
//Written and tested by M. Mazidi using Examples in chap. 7 of HCS12 textbook by Mazidi & Causey.
 
//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 */
  
   unsigned char x; 

    DDRA = 0xFF;    //PORTA as output since LEDs are connected to it
    DDRP = DDRP | 0b00010000;  //on Project Board, the lower 4 bits of PA3-PA0 are connected to LEDs(LED1-LED4) permanently
    PTP = PTP & 0b11101111;    //and must be enabled by clearing bit P4 of PORTP
                 //on Project Board,we need to connect 4 wires from LED5-LED8 (J10) to pins PA4-PA7 via J6 connector (pins 25,27,29,31)
          
    PORTB=0x0;    //port B as input
      
    for(;;) 			
      {
        x=PORTB;    //Get data from PORTB and send it to PORTA
        PORTA = x;
        MSDelay(1); //optional
      }
 
}


//The HCS12 MCU Module works with XTAL=4MHz 
//Freq. for Instruction Clock Cycle (Bus Freq.) is 2MHz (1/2 of 4MHz). 
 void MSDelay(unsigned int itime)
  {
    unsigned int i; unsigned int j;
    for(i=0;i<itime;i++)
      for(j=0;j<313;j++);    //1 msec. tested using Scope
  }