lin_con.c

freescale最新的16位单片机

/******************************************************************************
*
* Freescale Semiconductor Inc. 2006 All rights reserved
*
*******************************************************************************
*
* THIS SOFTWARE IS PROVIDED BY FREESCALE SEMICONDUCTOR "AS IS" AND ANY         
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED  
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE       
* DISCLAIMED.  IN NO EVENT SHALL FREESCALE SEMICONDUCTOR OR ITS CONTRIBUTORS   
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR       
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF         
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS     
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN      
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)      
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE   
* POSSIBILITY OF SUCH DAMAGE. 
*
***************************************************************************//*!
* 
* @file      lin_con.c
*
* @author    R89994
* 
* @version   1.0.4.0
* 
* @date      Jul-25-2006
*
* @brief     This file contains routines for LIN connectivity 
*            initialization and messages processing.
* 
* @note      Compiler CodeWarrior HCS12X V4.1
*
******************************************************************************/

/******************************************************************************
* INCLUDE
******************************************************************************/

#include <linapi.h>	                                   /* LIN driver include */
#include "lin_con.h"

/******************************************************************************
* VARIABLES DEFINITION
******************************************************************************/

unsigned char MsgSent[2];                                /* Transmited data  */
LINStatusType ret;			           /* Variable for LIN driver processing */
 
/**************************************************************************//*!
*
* @brief   User call-back.
*          Called by the driver after successful transmission or receiving 
* 	       of the Master Request Command Frame (ID Field value '0x3C').
*
* @return  Nothing
*
******************************************************************************/
 
void LIN_Command()
{
}

/***************************************************************************//*!
*
* @brief   This module initializes the LIN driver flags. 
*
* @return  Nothing
*
* @remarks The LIN driver s/w does not change state of the LIN_StateFlags after
*          the LIN transmit colision is detected by SCI module. Because of this,
*          the LIN driver s/w is not capable of any other LIN connectivity 
*          handling.
*          This module calls function, which initializes the LIN_StateFlags 
*          with LIN_FLAG_IGNORE. This enables correct driver functionality.   
*
******************************************************************************/

void LIN_StateFlagsUpdate(void)
{
	/* Set initial state -- this is abort any activity */
    LIN_StateFlagsInit();
}

/***************************************************************************//*!
*
* @brief   This module:
*          - initializes LIN driver,
*          - initializes LIN physical layer,
*          - loads data for 0x17 message.
*
* @return  Nothing
*
******************************************************************************/

void LIN_Module_Init(void)
{
	/* Initialize LIN driver */
	LIN_Init();
	
	/* Initialize SCI0 trasmit collision detection */
	/* Alternative control registers are sharing 
	   the address space: module base + (0x0000 -> 0x0002) */ 
	SCI0SR2_AMAP = 1;  
	
	/* Receiver input sampling on 13th time tick of transmitted bit */                    
    SCI0ACR2_BERRM1 = 1;
    SCI0ACR2_BERRM0 = 0;
    
    /* Bit error interrupt enable */ 
    SCI0ACR1_BERRIE = 1;
    
    /* SCIBDH, SCIBDL and SCICR1 registers are sharing 
	   the address space: module base + (0x0000 -> 0x0002) */ 
	SCI0SR2_AMAP = 0;    

	/* Enable LIN Physical Interface (set normal baudrate -> 
	   first TxD high, then toggle EN low-to-high) */
	LIN1_EN = 1;
	LIN1_EN_DDR = 1; 

	/* Load data for 0x17 message */
	MsgSent[0] = 0x55;
	MsgSent[1] = 0xAA;
}

/***************************************************************************//*!
*
* @brief   This module sends frame with identifier 0x17.
*
* @return  Nothing
*
* @remarks The 0x17 message processing takes 6.7ms on the LINbus 
*          with 9600Bd transmition speed. 
*
******************************************************************************/

void LIN_Send_Frame(void)
{
	/* Necessary LIN driver flags initialization after
       LIN transmit colision is detected (done by SCI module) */
    LIN_StateFlagsUpdate();
	
	/* Update message */
	ret = LIN_PutMsg(0x17, MsgSent);

	/* Send a request for message */
	ret = LIN_RequestMsg(0x17);
}