?? linsci.c
字號:
#define LINSCI_C
/******************************************************************************
*
* Copyright (C) 2005 Freescale Semiconductor, Inc.
* All Rights Reserved
*
* Filename: linsci.c
*
* Revision:
*
* Functions: SCI management module
*
* Description:
*
* Notes:
*
******************************************************************************/
#include <linbase.h>
#pragma MESSAGE DISABLE C4200 /* WARNING C4200: other segment than in previous declaration */
/****************************************************************************
* All common-purpose RAM variables shall be declared here.
***************************************************************************/
/****************************************************************************
* Some of the variables (more often used) can be declared using LIN_ZPAGE
* modifier.
* It require to perform zero page RAM placement optimisation.
***************************************************************************/
#if defined(S08) && defined(CW08)
#pragma DATA_SEG SHORT ZeroSeg
#endif /* defined(S08) && defined(CW08) */
LIN_ZPAGE LIN_BYTE LIN_TmpSCIStatus; /* byte to clear SCI status, and to receive byte */
#if defined(S08) && defined(CW08)
#pragma DATA_SEG DEFAULT
#endif /* defined(S08) && defined(CW08) */
#if defined(LINAPI_1_0)
/***************************************************************************
* Function : l_ifc_init_sci0
*
* Description: Initialize SCI to work with LIN bus.
* Set specified baud rate;
* Disable all SCI interrupts;
* Enable Tx and RX pins
*
* Returns: none
*
* Notes: LIN API service
*
**************************************************************************/
void l_ifc_init_sci0( void )
{
LIN_BYTE intMask;
LIN_DBG_SET_PORT_7;
intMask = LIN_DisableInt(); /* disable interrupts */
/* Disconnect SCI and set initial state -- this is abort any activity */
LIN_StateFlags = LIN_FLAG_IGNORE | LIN_FLAG_DISCONNECT;
/* ??? SCI not disabled while initialization */
#if defined(S08DZ60)
LIN_SCISetBaudRate(LIN_CfgConst.LIN_BaudRate);
/* one start bit, eight data bits, one stop bit */
LIN_SCCR1 = 0;
/* enable transmitter & receiver and disable all SCI interrupts */
LIN_SCCR2 = LIN_SCCR2_TE | LIN_SCCR2_RE;
/* SCI flags clearing and interrupts enables in ifc_connect */
#endif /* defined(S08DZ60) */
LIN_EnableInt(intMask); /* enable interrupts */
LIN_DBG_CLR_PORT_7;
}
/***************************************************************************
* Function : l_ifc_connect_sci0
*
* Description: Connect SCI -- clear all SCI flags,
* enable SCI interrupts, reset idle timeout.
*
* Returns: 0 -- success
* ~0 -- called before l_ifc_init()
*
* Notes: LIN API.
* If already connected then do nothing.
*
**************************************************************************/
l_bool l_ifc_connect_sci0( void )
{
l_irqmask intMask;
l_bool ret;
ret = 0; /* suppose that connecting OK */
LIN_DBG_SET_PORT_7;
intMask = LIN_DisableInt(); /* disable interrupts */
/* if l_ifc_connect called before l_ifc_init then return error */
if ( (LIN_StateFlags & LIN_FLAG_NOINIT) != 0 )
{
ret = ~0;
}
/* we are after l_ifc_init */
/* if an interrupt occurs here and call l_sys_init() then we in LIN_FLAG_NOINIT
so we need interrupt disabling -- OPTIM */
/* if interface is already connected then do nothing */
else if ( (LIN_StateFlags & LIN_FLAG_DISCONNECT) != 0 )
{
/* we are in disconnected state -> connect */
/* connect SCI hardware */
#if defined(S08DZ60)
/* clear SCI status */
LIN_TmpSCIByte = LIN_SCSR1;
LIN_TmpSCIByte = LIN_SCDR;
LIN_SCCR2 |= LIN_SCCR2_RIE; /* enable RX complited interrupt */
#endif /* defined(S08DZ60) */
/* start to wait break */
LIN_StateFlags = LIN_FLAG_IGNORE;
/* reset idle timeout */
LIN_SetIdleTimeout();
}
LIN_EnableInt(intMask); /* enable interrupts */
LIN_DBG_CLR_PORT_7;
return ret;
}
/***************************************************************************
* Function : l_ifc_disconnect_sci0
*
* Description: Disconnect SCI -- disable SCI interrupts.
*
* Returns: 0 -- success
* ~0 -- called before l_ifc_init()
*
* Notes: LIN API.
* If already disconnected then do nothing.
*
**************************************************************************/
l_bool l_ifc_disconnect_sci0( void )
{
l_irqmask intMask;
l_bool ret;
ret = 0; /* suppose that disconnecting OK */
LIN_DBG_SET_PORT_7;
intMask = LIN_DisableInt(); /* disable interrupts */
/* if l_ifc_disconnect called before l_ifc_init then return error */
if ( (LIN_StateFlags & LIN_FLAG_NOINIT) != 0 )
{
ret = ~0;
}
/* we are after l_ifc_init */
/* if an interrupt occurs here and call l_sys_init() then we in LIN_FLAG_NOINIT
so we need interrupt disabling -- OPTIM */
/* if interface is already disconnected then do nothing */
else if ( (LIN_StateFlags & LIN_FLAG_DISCONNECT) == 0 )
{
/* we are in connected state -> disconnect */
/* disconnect SCI hardware */
#if defined(S08DZ60)
/* enable transmitter and receiver, disable all SCI interrupts */
LIN_SCCR2 = LIN_SCCR2_TE | LIN_SCCR2_RE;
#endif /* defined(S08DZ60) */
/* set disconnected state */
LIN_StateFlags = LIN_FLAG_IGNORE | LIN_FLAG_DISCONNECT;
}
LIN_EnableInt(intMask); /* enable interrupts */
LIN_DBG_CLR_PORT_7;
return ret;
}
#else /* !defined(LINAPI_1_0) */
/***************************************************************************
* Function : LIN_SCIInit
*
* Description: Initialize SCI to work with LIN bus.
* Set specified baud rate;
* Disable all SCI interrupts;
* Enable Tx and RX pins
* Enable Rx interrupt
*
* Returns: none
*
* Notes: 1. SLAVE, MASTER node
*
**************************************************************************/
void LIN_SCIInit( void )
{
/* ??? SCI not disabled while initialization */
#if defined(S08DZ60)
/* initialization order correct */
LIN_SCISetBaudRate(LIN_CfgConst.LIN_BaudRate);
/* one start bit, eight data bits, one stop bit */
LIN_SCCR1 = 0;
/* enable transmitter & receiver and disable all SCI interrupts */
LIN_SCCR2 = LIN_SCCR2_TE | LIN_SCCR2_RE;
#if defined (MASTER)
LIN_SCSR2 |= LIN_SCSR2_BRK13; /* init sending 13 bit break with M=0*/
#endif /* defined(MASTER) */
/* clear SCI status */
LIN_TmpSCIByte = LIN_SCSR1;
LIN_TmpSCIByte = LIN_SCDR;
LIN_SCCR2 |= LIN_SCCR2_RIE; /* enable RX complete interrupt */
LIN_SCCR3 |= LIN_SCCR3_FEIE; /* Enable Frame Error interrupt */
#endif /* defined(S08DZ60) */
}
#endif /* !defined(LINAPI_1_0) */
/***************************************************************************
* Function : LIN_SCISetBaudRate
*
* Description: Programm SCI to particular baud rate
*
* Returns: none
*
* Notes: none
*
**************************************************************************/
void LIN_SCISetBaudRate( LIN_WORD baudRate )
{
/* set the baud rate divider */
#if defined(S08DZ60)
LIN_SCBDH = (LIN_BYTE)((baudRate >> 8) & 0x001f);
LIN_SCBDL = (LIN_BYTE)(baudRate & 0x00ff);
#endif /* defined(S08DZ60) */
}
/****************************************************************************/
/****************************************************************************/
/*** Interrupt Driven Routines ***/
/****************************************************************************/
/****************************************************************************/
#if defined(LINAPI_1_0)
/***************************************************************************
* Function : l_ifc_tx_sci0
*
* Description: SCI transmit processing
*
* Returns: none
*
* Notes: 1. Tx enable interrupt disabled forever
* Tx completed interrupt enabled only while send wakeup symbol
* 2. LIN API function
*
**************************************************************************/
void l_ifc_tx_sci0( void )
{
LIN_DBG_SET_PORT_0;
if ( (LIN_StateFlags & LIN_FLAG_DISCONNECT) == 0 )
{
/* work only if SCI connected */
LIN_DBG_SET_PORT_2;
#if defined(S08DZ60)
LIN_SCCR2 &= ~( LIN_SCCR2_TCIE ); /* Disable Tx completed */
#endif /* defined(S08DZ60) */
LIN_TxCompleted();
LIN_DBG_CLR_PORT_2;
}
LIN_DBG_CLR_PORT_0;
}
/***************************************************************************
* Function : l_ifc_rx_sci0
*
* Description: SCI receive and SCI error processing
*
* Returns: none
*
* Notes: 1. Only for LIN API
* 2. Set bit 1 in debug port while working.
* 3. Rx interrupt enabled forever
*
**************************************************************************/
void l_ifc_rx_sci0( void )
{
LIN_DBG_SET_PORT_0;
if ( (LIN_StateFlags & LIN_FLAG_DISCONNECT) == 0 )
{
/* work only if SCI connected */
#if defined(S08DZ60)
LIN_TmpSCIStatus = LIN_SCSR1;
LIN_TmpSCIByte = LIN_SCDR; /* clear all flags */
#endif /* defined(S08DZ60) */
#if defined(S08DZ60)
if ( LIN_TmpSCIStatus & LIN_SCSR1_FE )
{
if ( LIN_TmpSCIByte == 0 ) /* Check SCI RX data bit if 0 so count next
bittime to receive 11 bittime break else frame error */
{
#endif /* defined(S08DZ60) */
/* Normal Break */
LIN_DBG_SET_PORT_5;
LIN_FrameError(LIN_NORMALBREAK);
LIN_DBG_CLR_PORT_5;
}
else
{
#if defined(S08DZ60)
LIN_SCCR2 &= ~LIN_SCCR2_RE; /* NB: disable and enable SCI to prevent */
/* distinction next zero level bit as start bit */
#endif /* defined(S08DZ60) */
LIN_DBG_SET_PORT_3; /* indicate frame error recognized */
LIN_FrameError(LIN_FRAMEERROR);
LIN_DBG_CLR_PORT_3;
#if defined(S08DZ60)
LIN_SCCR2 |= LIN_SCCR2_RE; /* enable SCI Rx */
#endif /* defined(S08DZ60) */
}
}
else
{
/* SCI Receive */
LIN_DBG_SET_PORT_1;
LIN_RxCompleted();
LIN_DBG_CLR_PORT_1;
}
}
LIN_DBG_CLR_PORT_0;
}
#else /* defined(LINAPI_1_0) */
/***************************************************************************
* Function : LIN_ISR_SCI_Receive
*
* Description: SCI receive interrupt
*
* Returns: none
*
* Notes: 1. Set bit 1 in debug port while working.
* 2. Rx interrupt enabled forever
* 3. For Freescale API only
*
**************************************************************************/
LIN_INTERRUPT LIN_ISR_SCI_Receive ( void )
{
LIN_DBG_SET_PORT_0;
LIN_DBG_SET_PORT_1;
#if defined(S08DZ60)
LIN_TmpSCIStatus = LIN_SCSR1;
LIN_TmpSCIByte = LIN_SCDR; /* clear all flags */
#endif /* defined(S08DZ60) */
LIN_RxCompleted();
LIN_DBG_CLR_PORT_1;
LIN_DBG_CLR_PORT_0;
}
/***************************************************************************
* Function : LIN_ISR_SCI_Error
*
* Description: SCI error interrupt
*
* Returns: none
*
* Notes: 1. Set bit 1 in debug port while working.
* 2. For Freescale API only
*
**************************************************************************/
LIN_INTERRUPT LIN_ISR_SCI_Error ( void )
{
LIN_DBG_SET_PORT_4;
LIN_DBG_SET_PORT_0;
#if defined(S08DZ60)
LIN_TmpSCIStatus = LIN_SCSR1;
LIN_TmpSCIByte = LIN_SCDR; /* clear all flags */
#endif /* defined(S08DZ60) */
#if defined(MASTER)
LIN_DBG_SET_PORT_3; /* indicate frame error recognized */
LIN_FrameError();
LIN_DBG_CLR_PORT_3;
#endif /* defined(MASTER) */
#if defined(SLAVE)
#if defined(S08DZ60)
if ( LIN_TmpSCIByte == 0 ) /* Check SCI RX data bit if 0 so count next
bittime to receive 11 bittime break else frame error */
#endif /* defined(S08DZ60) */
{
LIN_DBG_SET_PORT_5;
LIN_FrameError(LIN_NORMALBREAK);
LIN_DBG_CLR_PORT_5;
}
else
{
LIN_DBG_SET_PORT_3; /* indicate frame error recognized */
LIN_FrameError(LIN_FRAMEERROR);
LIN_DBG_CLR_PORT_3;
}
#endif /* defined(SLAVE) */
LIN_DBG_CLR_PORT_0;
}
#endif /* defined(LINAPI_1_0) */
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