can.h

//*****************************************************************************
//
// can.h - Defines and Macros for the CAN controller.
//
// Copyright (c) 2006-2010 Texas Instruments Incorporated.  All rights reserved.
// Software License Agreement
// 
// Texas Instruments (TI) is supplying this software for use solely and
// exclusively on TI's microcontroller products. The software is owned by
// TI and/or its suppliers, and is protected under applicable copyright
// laws. You may not combine this software with "viral" open-source
// software in order to form a larger program.
// 
// THIS SOFTWARE IS PROVIDED "AS IS" AND WITH ALL FAULTS.
// NO WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT
// NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. TI SHALL NOT, UNDER ANY
// CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
// DAMAGES, FOR ANY REASON WHATSOEVER.
// 
// This is part of revision 6459 of the Stellaris Peripheral Driver Library.
//
//*****************************************************************************

#ifndef __CAN_H__
#define __CAN_H__

//*****************************************************************************
//
//! \addtogroup can_api
//! @{
//
//*****************************************************************************

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif

//*****************************************************************************
//
// Miscellaneous defines for Message ID Types
//
//*****************************************************************************

//*****************************************************************************
//
// These are the flags used by the tCANMsgObject.ulFlags value when calling the
// CANMessageSet() and CANMessageGet() functions.
//
//*****************************************************************************

//
//! This definition is used with the tCANMsgObject ulFlags value and indicates
//! that transmit interrupts should be enabled, or are enabled.
//
#define MSG_OBJ_TX_INT_ENABLE   0x00000001

//
//! This indicates that receive interrupts should be enabled, or are
//! enabled.
//
#define MSG_OBJ_RX_INT_ENABLE   0x00000002

//
//! This indicates that a message object will use or is using an extended
//! identifier.
//
#define MSG_OBJ_EXTENDED_ID     0x00000004

//
//! This indicates that a message object will use or is using filtering
//! based on the object's message identifier.
//
#define MSG_OBJ_USE_ID_FILTER   0x00000008

//
//! This indicates that new data was available in the message object.
//
#define MSG_OBJ_NEW_DATA        0x00000080

//
//! This indicates that data was lost since this message object was last
//! read.
//
#define MSG_OBJ_DATA_LOST       0x00000100

//
//! This indicates that a message object will use or is using filtering
//! based on the direction of the transfer.  If the direction filtering is
//! used, then ID filtering must also be enabled.
//
#define MSG_OBJ_USE_DIR_FILTER  (0x00000010 | MSG_OBJ_USE_ID_FILTER)

//
//! This indicates that a message object will use or is using message
//! identifier filtering based on the extended identifier.  If the extended
//! identifier filtering is used, then ID filtering must also be enabled.
//
#define MSG_OBJ_USE_EXT_FILTER  (0x00000020 | MSG_OBJ_USE_ID_FILTER)

//
//! This indicates that a message object is a remote frame.
//
#define MSG_OBJ_REMOTE_FRAME    0x00000040

//
//! This indicates that this message object is part of a FIFO structure and
//! not the final message object in a FIFO.
//
#define MSG_OBJ_FIFO            0x00000200

//
//! This indicates that a message object has no flags set.
//
#define MSG_OBJ_NO_FLAGS        0x00000000

//*****************************************************************************
//
//! This define is used with the flag values to allow checking only status
//! flags and not configuration flags.
//
//*****************************************************************************
#define MSG_OBJ_STATUS_MASK     (MSG_OBJ_NEW_DATA | MSG_OBJ_DATA_LOST)

//*****************************************************************************
//
//! The structure used for encapsulating all the items associated with a CAN
//! message object in the CAN controller.
//
//*****************************************************************************
typedef struct
{
    //
    //! The CAN message identifier used for 11 or 29 bit identifiers.
    //
    unsigned long ulMsgID;

    //
    //! The message identifier mask used when identifier filtering is enabled.
    //
    unsigned long ulMsgIDMask;

    //
    //! This value holds various status flags and settings specified by
    //! tCANObjFlags.
    //
    unsigned long ulFlags;

    //
    //! This value is the number of bytes of data in the message object.
    //
    unsigned long ulMsgLen;

    //
    //! This is a pointer to the message object's data.
    //
    unsigned char *pucMsgData;
}
tCANMsgObject;

//*****************************************************************************
//
//! This structure is used for encapsulating the values associated with setting
//! up the bit timing for a CAN controller.  The structure is used when calling
//! the CANGetBitTiming and CANSetBitTiming functions.
//
//*****************************************************************************
typedef struct
{
    //
    //! This value holds the sum of the Synchronization, Propagation, and Phase
    //! Buffer 1 segments, measured in time quanta.  The valid values for this
    //! setting range from 2 to 16.
    //
    unsigned int uSyncPropPhase1Seg;

    //
    //! This value holds the Phase Buffer 2 segment in time quanta.  The valid
    //! values for this setting range from 1 to 8.
    //
    unsigned int uPhase2Seg;

    //
    //! This value holds the Resynchronization Jump Width in time quanta.  The
    //! valid values for this setting range from 1 to 4.
    //
    unsigned int uSJW;

    //
    //! This value holds the CAN_CLK divider used to determine time quanta.
    //! The valid values for this setting range from 1 to 1023.
    //
    unsigned int uQuantumPrescaler;
}
tCANBitClkParms;

//*****************************************************************************
//
//! This data type is used to identify the interrupt status register.  This is
//! used when calling the CANIntStatus() function.
//
//*****************************************************************************
typedef enum
{
    //
    //! Read the CAN interrupt status information.
    //
    CAN_INT_STS_CAUSE,

    //
    //! Read a message object's interrupt status.
    //
    CAN_INT_STS_OBJECT
}
tCANIntStsReg;

//*****************************************************************************
//
//! This data type is used to identify which of several status registers to
//! read when calling the CANStatusGet() function.
//
//*****************************************************************************
typedef enum
{
    //
    //! Read the full CAN controller status.
    //
    CAN_STS_CONTROL,

    //
    //! Read the full 32-bit mask of message objects with a transmit request
    //! set.
    //
    CAN_STS_TXREQUEST,

    //
    //! Read the full 32-bit mask of message objects with new data available.
    //
    CAN_STS_NEWDAT,

    //
    //! Read the full 32-bit mask of message objects that are enabled.
    //
    CAN_STS_MSGVAL
}
tCANStsReg;

//*****************************************************************************
//
// These definitions are used to specify interrupt sources to CANIntEnable()
// and CANIntDisable().
//
//*****************************************************************************
//
//! This flag is used to allow a CAN controller to generate error
//! interrupts.
//
#define CAN_INT_ERROR           0x00000008

//
//! This flag is used to allow a CAN controller to generate status
//! interrupts.
//
#define CAN_INT_STATUS          0x00000004

//
//! This flag is used to allow a CAN controller to generate any CAN
//! interrupts.  If this is not set, then no interrupts will be generated
//! by the CAN controller.
//
#define CAN_INT_MASTER          0x00000002

//*****************************************************************************
//
//! This definition is used to determine the type of message object that will
//! be set up via a call to the CANMessageSet() API.
//
//*****************************************************************************
typedef enum
{
    //
    //! Transmit message object.
    //
    MSG_OBJ_TYPE_TX,

    //
    //! Transmit remote request message object
    //
    MSG_OBJ_TYPE_TX_REMOTE,

    //
    //! Receive message object.
    //
    MSG_OBJ_TYPE_RX,

    //
    //! Receive remote request message object.
    //
    MSG_OBJ_TYPE_RX_REMOTE,

    //
    //! Remote frame receive remote, with auto-transmit message object.
    //
    MSG_OBJ_TYPE_RXTX_REMOTE
}
tMsgObjType;

//*****************************************************************************
//
// The following enumeration contains all error or status indicators that can
// be returned when calling the CANStatusGet() function.
//
//*****************************************************************************
//
//! CAN controller has entered a Bus Off state.
//
#define CAN_STATUS_BUS_OFF      0x00000080

//
//! CAN controller error level has reached warning level.
//
#define CAN_STATUS_EWARN        0x00000040

//
//! CAN controller error level has reached error passive level.
//
#define CAN_STATUS_EPASS        0x00000020

//
//! A message was received successfully since the last read of this status.
//
#define CAN_STATUS_RXOK         0x00000010

//
//! A message was transmitted successfully since the last read of this
//! status.
//
#define CAN_STATUS_TXOK         0x00000008

//
//! This is the mask for the last error code field.
//
#define CAN_STATUS_LEC_MSK      0x00000007

//
//! There was no error.
//
#define CAN_STATUS_LEC_NONE     0x00000000

//
//! A bit stuffing error has occurred.
//
#define CAN_STATUS_LEC_STUFF    0x00000001

//
//! A formatting error has occurred.
//
#define CAN_STATUS_LEC_FORM     0x00000002

//
//! An acknowledge error has occurred.
//
#define CAN_STATUS_LEC_ACK      0x00000003

//
//! The bus remained a bit level of 1 for longer than is allowed.
//
#define CAN_STATUS_LEC_BIT1     0x00000004

//
//! The bus remained a bit level of 0 for longer than is allowed.
//
#define CAN_STATUS_LEC_BIT0     0x00000005

//
//! A CRC error has occurred.
//
#define CAN_STATUS_LEC_CRC      0x00000006

//
//! This is the mask for the CAN Last Error Code (LEC).
//
#define CAN_STATUS_LEC_MASK     0x00000007

//*****************************************************************************
//
// API Function prototypes
//
//*****************************************************************************
extern void CANBitTimingGet(unsigned long ulBase, tCANBitClkParms *pClkParms);
extern void CANBitTimingSet(unsigned long ulBase, tCANBitClkParms *pClkParms);
extern unsigned long CANBitRateSet(unsigned long ulBase,
                                   unsigned long ulSourceClock,
                                   unsigned long ulBitRate);
extern void CANDisable(unsigned long ulBase);
extern void CANEnable(unsigned long ulBase);
extern tBoolean CANErrCntrGet(unsigned long ulBase, unsigned long *pulRxCount,
                              unsigned long *pulTxCount);
extern void CANInit(unsigned long ulBase);
extern void CANIntClear(unsigned long ulBase, unsigned long ulIntClr);
extern void CANIntDisable(unsigned long ulBase, unsigned long ulIntFlags);
extern void CANIntEnable(unsigned long ulBase, unsigned long ulIntFlags);
extern void CANIntRegister(unsigned long ulBase, void (*pfnHandler)(void));
extern unsigned long CANIntStatus(unsigned long ulBase,
                                  tCANIntStsReg eIntStsReg);
extern void CANIntUnregister(unsigned long ulBase);
extern void CANMessageClear(unsigned long ulBase, unsigned long ulObjID);
extern void CANMessageGet(unsigned long ulBase, unsigned long ulObjID,
                          tCANMsgObject *pMsgObject, tBoolean bClrPendingInt);
extern void CANMessageSet(unsigned long ulBase, unsigned long ulObjID,
                          tCANMsgObject *pMsgObject, tMsgObjType eMsgType);
extern tBoolean CANRetryGet(unsigned long ulBase);
extern void CANRetrySet(unsigned long ulBase, tBoolean bAutoRetry);
extern unsigned long CANStatusGet(unsigned long ulBase, tCANStsReg eStatusReg);

//*****************************************************************************
//
// Several CAN APIs have been renamed, with the original function name being
// deprecated.  These defines provide backward compatibility.
//
//*****************************************************************************
#ifndef DEPRECATED
#define CANSetBitTiming(a, b)   CANBitTimingSet(a, b)
#define CANGetBitTiming(a, b)   CANBitTimingGet(a, b)
#endif

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

//*****************************************************************************
//
// Close the Doxygen group.
//! @}
//
//*****************************************************************************

#endif //  __CAN_H__