/*******************************************************************************
* Freescale Semiconductor Inc.
* (c) Copyright 2012 Freescale Semiconductor, Inc.
* ALL RIGHTS RESERVED.
********************************************************************************
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********************************************************************************
* File main.c
* Owner b34874
* Version 1.0 // version 0.x is reserved for development phase and
// should not be placed in the repository
* Date Sep-4-2013
* Classification General Business Information/Internal Use Only/Confidential Proprietary
* Brief Brief description of the file
********************************************************************************
* Detailed Description:
* Software periodically sends/receives (depends on CAN_node value) CAN frame. 
* Software suppose using of two S12G boards
*
* Results are sent over SCI module
*
* For simplicity is CAN clock based on default bus clock (6.25MHz) and Can baud rate is set to 390625bit/s
* 
* Don't forget install jumpers at J2 and J7 connectors on TWR boards
*  
* Tested on: S12G64/S12G128/S12G240, TWR-S12G64/TWR-S12G128/TWR-S12G240, 
* CLK source:1MHz IRCCLK; BUSCLK:6.25MHz
********************************************************************************
Revision History:
Version Date Author Description of Changes
1.0 Dec/11/2012 b34874 Initial Version
1.1 Sep/04/2013 b34874 update of can_S12G.c file-MSCANSendMsg-select TX buffer code
*******************************************************************************/
#include <hidef.h>      /* common defines and macros */
#include "derivative.h"      /* derivative-specific definitions */
#include "can_S12G.h"
#include "stdio.h"
#include "map.h"


#define CAN_node_send 0x00;
#define CAN_node_receive 0x01;

unsigned char CAN_id = 0x00;
unsigned char CAN_data_lenght = 1;
unsigned char CAN_node = CAN_node_send;

UBYTE data;
SBYTE txt[50];


//==============================================================================
// SCI0 initialization
//==============================================================================
void  SCI0_Init(void)
{
 //----- BR = BUSCLK / (16*Baud rate) = 6250000 / (16*9600) = 41 = 0x29 -----
                                            //------------------------------------------------------
   SCI0BDH = 0x00;                          // prescaller value (depends on module clock frequency) 
   SCI0BDL = 0x29;                          // prescaller = 0x29   9600Bd  (6.25MHz bus clock is set)
                                            //------------------------------------------------------
   SCI0CR1 = 0x04;                          // Loops sciswai rsrc   m    wake  ilt   pe    pt       
                                            // 0-LOOPS=RSRC=0 => 1 Single-wire mode with Rx input connected to TXD
                                            // 0-SCI dis. in wait mode                              
                                            // 0-if RSRC=1-RxTx intern. connected if loops=1                  
                                            // 0-start+8 data+1 stop bit                          
                                            // 0-IDLE mark wake up                                  
                                            // 1-idle char. bit count begins after stop bit         
                                            // 0-parity fction disabled                             
                                            // 0-odd parity                                       
                                            //------------------------------------------------------
   SCI0CR2 = 0x0C;                          // tie   tcie    rie  ilie   te    re   rwu   sbk       
                                            // 0-Tx empty intr disabled                             
                                            // 0-Tx complete intr disabled                          
                                            // 0-Rx full + OverRun interrupts
                                            // 0-idle line intr disabled                            
                                            // 1-transmitter enabled
                                            // 0-receiver disabled
                                            // 0-receiver normal operation                                   
                                            // 0-no break characters                                
                                            //------------------------------------------------------
}
//==============================================================================

//==============================================================================
// SCI send text
//==============================================================================
void send_text(SBYTE *str)
{
  unsigned char i;
  i=0;
  while(str[i]!='\0')
    {
     while(!SCI0SR1_TC);                    // write data to SCI (clear TC) 
     SCI0DRL = str[i];
     i++;
    }
}
//==============================================================================

//==============================================================================
// delay loop
//==============================================================================
void delay(void)
{
 unsigned int  i,j;
 for(i=0;i<0xFFFF;i++) for(j=0;j<5;j++) { asm nop; }
}
//==============================================================================

//==============================================================================
// Get CAN message
//==============================================================================
void RxMsgOnCAN(UBYTE data0)
{
   UBYTE tmp0;

   while(!MSCANCheckRcvdMsg());           // CAN#,CAN# :wait till mesage is not received
   if(MSCANGetMsg(&canRxMsg))       // CAN# :get message
    {if(canRxMsg.id == CAN_id && canRxMsg.RTR == 0) // check message id
      {tmp0 = canRxMsg.data[0];          // show received data
       data0 = tmp0;
       (void)sprintf(txt,"received: 0x%02X DTR:%d \n\r",tmp0, canRxMsg.len);
       send_text(txt);
      }
    }
  
   
}


//==============================================================================
// main loop
//==============================================================================
void main(void) {  


  PER01AD = 0xFFFF; 
  
  SCI0_Init();
  
  DDRT  = 0xF0;                          // PORT T is an output port for LEDs
  
  init_CAN(0xC0, 0x67, 0);               // 390625bit/s, loop enabled/disabled=1/0  (TJA1041T)
                                         // For calculation use CAN baud rate calculator CAN_setup2.xls
                                         
	data = 0x00;
	
	send_text("\r\n\r\nHELLO, I AM ALIVE....\r\n\r\n");


  for(;;) {
  
  if (CAN_node)                         // Receiver
  {                                     
   
   RxMsgOnCAN(data);                    // CAN receive function
   
  } else                                // Transmitter
  {
   createMessage(&canTxMsg,CAN_id,0,CAN_data_lenght,3,data,0,0,0,0,0,0,0);  //CAN#,id,RTR,len,prty,d0,d1,d2,d3,d4,d5,d6,d7
   (void) MSCANSendMsg(&canTxMsg);            // CAN#,CAN#, buf :send message
   
   (void)sprintf(txt,"sent: 0x%02X \r\n",data);
   send_text(txt);
   
   data++;
   
   delay(); 
  }
   
   // _FEED_COP(); /* feeds the dog */
  } /* loop forever */
  /* please make sure that you never leave main */
}
