//Getting data from 8 DIP SW of PORTB and sending it 8 LEDs on PORTA 
//with HCS12 MCU Module using Freescale Student Project board  
//HCS12 MCU Moduless 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 Project Board,
//a)We need to connect 8 wires from SW1-1,2,3,3 and SW2-1,2,3,4 (on J10) to pins PORTB7-PORTB0 (via J6 connector)
//b)Notice on J6 of Project Board PORTB7-PORTB0 are pins 41,43,45,47,49,51,53,55

//On HCS12 MCU Module itself,
//a)MAKE SURE ALL the jumpers for PORTB are removed.(SW3-1...SW3-4 and LED1-LED4) 
//b)The 8 Jumpers (SW3-1...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 Modified by Mazidi from 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
  }