ex1_utility.c

基于摩托罗拉S12标准源程序 包括：SCIO,Timer

/******************************************************************************
*                                                  
*  (c) copyright Freescale Semiconductor Hong Kong Ltd. 2004
*  ALL RIGHTS RESERVED
*                                                                       
*******************************************************************************  
** THIS  CODE IS ONLY INTENDED AS AN EXAMPLE FOR DEMONSTRATING THE FREESCALE **
** MICROCONTROLLERS.  IT  HAS ONLY BEEN GIVEN A MIMIMUM LEVEL OF TEST. IT IS **
** PROVIDED  'AS  SEEN'  WITH  NO  GUARANTEES  AND  NO  PROMISE  OF SUPPORT. **
*******************************************************************************  
*                                                                           
* FILE:         main.c	          REVISION 0.2
*  
* DESCRIPTION:  Application code is placed here.
*               This module handles all tasks related to the rs232 port  
*               Program to control the SCI0 module to send and receive ASCII 
* 			        to and from PC serial port RS232 
*
* TARGET DEVICE: 		Hardware EVB912DP256 or equivalent                                                                                                                                                      
*
* COMPILER: Metrowerks            VERSION: ADS v1.2 (initial version)           
*                                 VERSION: ADS v2.0 (Demo beta version)
*                                 VERSION: ADS v3.1 (Demo version)
*																												 
* NOTES
* -----
* All modules remain at their reset addresses.                                                      
*
*
* UPDATED HISTORY:
*
* REV   YYYY.MM.DD  AUTHOR        DESCRIPTION OF CHANGE
* ---   ----------  ------        --------------------- 
* 0.0   2002.04.27  Kenny Lam     Initial version
* 0.1   2002.09.12  Kenny Lam     Demo beta version
* 0.2   2004.04.12  Kenny Lam     Demo version
*
******************************************************************************/                                                                        
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/*****************************************************************************/

#include <hidef.h>
#include <math.h>
#include "ex1_extern.h"
#include "DP256Port.h"
#include "GlobalVar.h"

#ifdef Banked
#pragma CODE_SEG CodeForcedToPPage33								 
#else
#pragma CODE_SEG DEFAULT
#endif

/*******************************************************************
* Init SCI port 0 as baud 9600 subroutine
* Description : Initial SCI as 9600 and enable tx and rx
*			  :
* Example     : N/A  
* Input 	  : N/A
* Output	  : N/A
* Modify      : N/A
* Return      : N/A
********************************************************************/ 
void init_SCI0 () 
{  
    SC0BDW=Eclock/16/9600;		//9600 buad rate	
  	SC0CR2=0xc;					//enable tx,rx
}

/*******************************************************************
* Transmit char (ASCII) subroutine 
* Description : Transmit ascii via RS232
*			  :
* Example     : N/A  
* Input 	  : data
* Output	  : single ascii to screen 
* Modify      : N/A
* Return      : N/A
********************************************************************/ 
void tx_char0(char data)
{
	while ((SC0SR1&0x40)!=0x40);
	SC0DRL = data;
}

/*******************************************************************
* printf0 subroutine
* Description : Transmit string via RS232
*			  :
* Example     : N/A  
* Input 	  : *str
* Output	  : ascii to screen without lf and cr at the end
* Modify      : N/A
* Return      : N/A
********************************************************************/ 
void printf0(char *str)
{	
	while((*str != '\r'))
	{
		tx_char0(*str);
		if(*str++=='\n')
		  tx_char0('\r');		
	}
}

/**********************************************
* eat time subroutine
***********************************************/
void delay1()
{	
	unsigned int data;

	data=0xffff;
	while((data--)!=0);
}

/*******************************************************************
* Transmit out 1 char (ASCII) subroutine
* Description : Transmit out upper and lower 4 bit of char as ascii
*             : via RS232
*			  :
* Example     : 0x32  
* Input 	  : 0x32 (cdata)
* Output	  : 3 2 (ascii)
* Modify      : N/A
* Return      : void
********************************************************************/ 
void send_asc(byte cdata)
{
	if(cdata>9)
	  tx_char0(cdata+'0'+7);
	else
	  tx_char0(cdata+'0');	  	
}

/*******************************************************************
* Convert HEX to ASCII subroutine
* Description : Convert hex to ascii and send out via RS232
*			  :
* Example     : 0x32  
* Input 	  : 0x32 (cdata)
* Output	  : 3 2 (ascii)
* Modify      : N/A
* Return      : void
********************************************************************/ 
void hex_asc(byte cdata)
{
	send_asc((cdata>>4)&0x0f);
	send_asc((cdata)&0x0f);	
}