/////////////////////////////////////////////////////////////////////////////////////////
//
// Sample for Freescale EVB9S08DZ60
//
// LIN communication data from master to slave
//
// This example must be programmed in two EVB9S08DZ60 Demo Boards connected
// through the LIN bus.
//
// This program sends the potentiometer value of the Master board through
// the LIN bus and displays the value received on the PTD[7..0] LEDs of the Slave board.
//
// A LIN cable must connect the two boards.
//
// Before to run this example, verify that all jumpers are in their default
// position. The "SERIAL SETTINGS" jumper (J301) must be in LIN position.
// Moreover, the example on the Master board must be compiled with
//
// #define _MASTER 1
//
// while the Slave board must be compiled with
//
// #define _MASTER 0
//
// See the "Summary of Jumper and Connector Settings" chapter in
// the user's manual.
//
// NOTE: This example serves the only purpose of showing how to manage the SCI
// peripheral to reconstruct a LIN bus, and is not intended to be a starting
// point for a real-world LIN application.
//
// --------------------------------------------------------------------------------------
//
// This project has been written for CodeWarrior 5.0 for HC(S)08
// and uses Registers Files MC9S08DZ60.H and MC9S08DZ60.C, version 2.87.006
// --------------------------------------------------------------------------------------
// Copyright (c) 2006 SofTec Microsystems
// http://www.softecmicro.com/
//
/////////////////////////////////////////////////////////////////////////////////////////

#include <hidef.h>
#include "derivative.h"
#include "lin.h"

#define     _ID         0x0001
#define     _MASTER     1       // 0 = SLAVE TASK
                                // 1 = MASTER TASK                               
Bool lin_send_enable = FALSE;
unsigned char potentiometer_value;
struct message msg_send, msg_get;

/////////////////////////////////////////////////////////////////////////////////////////
// PeriphInit
// --------------------------------------------------------------------------------------
// Initializes various registers and peripherals
/////////////////////////////////////////////////////////////////////////////////////////
void PeriphInit(void)
{
										
  // Clears COP Watchdog timeout
  SOPT1 = 0x00;
  
  // Selects FBE MCG mode (IREFS=0, CLKS=10)
  MCGC1 = 0xB8;
  // LP=0 and selects external high frequency crystal clock  		                
  MCGC2 = 0x36;
  // PLLS=0
  MCGC3 = 0x00;
  // Waits until the initialization cycle of the external crystal clock is completed 
  while(!(MCGSC&0x02))
    ;
  
  // Sets TJA1020 LIN transceiver in normal mode operation (NSLP HIGH) 
  PTED = 0x10;
  PTEDD = 0x10;   
  
  //Selects fBUS/2 as ADC clock source, clock divide 2 and 8 bit conversion mode
  ADCFG = 0x21;
  
  // Configures PTD port as output and power off LEDs
  PTDD = 0xFF;  
  PTDDD = 0xFF;

  // AD2 pin I/O control disabled
  APCTL1 = 0x04;
  
  // Timer1 Overflow every 5 ms
  TPM1MODH = 0x27;
  TPM1MODL = 0x10;
  
  // Enables Interrupt Overflow Timer1 and 
  // selects bus clock as clock source. Prescaler Divisor = 1
  TPM1SC = 0x48;
  
  LINInit();
  
  EnableInterrupts;
    
}

/////////////////////////////////////////////////////////////////////////////////////////
// MAIN
/////////////////////////////////////////////////////////////////////////////////////////
void main(void)
{

  PeriphInit();
  
  for(;;) 
  {
    #if(_MASTER)    // Master 
      if (lin_send_enable)
      {
        // Selects ADC2(PTA2) channel and continuous conversion
        ADSC1 = 0x22;
        while (!(ADSC1 & 0x80))
         ;
         
        // Sends the potentiometer value to the LIN bus
        potentiometer_value = ADRL;
        msg_send.identifier = _ID;
        msg_send.data_field[0] = potentiometer_value;
        (void)LINSendMsg(TRUE, TRUE, msg_send);
        PTDD = ~potentiometer_value;
        lin_send_enable = FALSE;  
      }
    #else           // Slave
      if (LINCheckState() == CHECKSUM)
      {
        // Reads the potentiometer value from the LIN bus
        if (LINGetMsg(TRUE, &msg_get))
        {
          if (msg_get.identifier == _ID)
            // Shows the potentiometer value on the LEDs
            PTDD = ~msg_get.data_field[0];
        }  
      }
    #endif
  }
  
}      

/////////////////////////////////////////////////////////////////////////////////////////
// Timer1_overflow
// --------------------------------------------------------------------------------------
// TIMER1 Overflow Interrupt 
/////////////////////////////////////////////////////////////////////////////////////////
interrupt void Timer1_overflow (void)
{
  
  lin_send_enable = TRUE;
  
  TPM1SC &=0x7F;
    
}