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*
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******************************************************************************/
/*****************************************************************************/
/**
*
* @file xcanps.h
*
* The Xilinx CAN driver component. This component supports the Xilinx
* CAN Controller.
*
* The CAN Controller supports the following features:
* - Confirms to the ISO 11898-1, CAN 2.0A and CAN 2.0B standards.
* - Supports both Standard (11 bit Identifier) and Extended (29 bit
* Identifier) frames.
* - Supports Bit Rates up to 1 Mbps.
* - Transmit message object FIFO with a user configurable depth of
* up to 64 message objects.
* - Transmit prioritization through one TX High Priority Buffer.
* - Receive message object FIFO with a user configurable depth of
* up to 64 message objects.
* - Watermark interrupts for Rx FIFO with configurable Watermark.
* - Acceptance filtering with 4 acceptance filters.
* - Sleep mode with automatic wake up.
* - Loop Back mode for diagnostic applications.
* - Snoop mode for diagnostic applications.
* - Maskable Error and Status Interrupts.
* - Readable Error Counters.
* - External PHY chip required.
* - Receive Timestamp.
*
* The device driver supports all the features listed above, if applicable.
*
* <b>Driver Description</b>
*
* The device driver enables higher layer software (e.g., an application) to
* communicate to the CAN. The driver handles transmission and reception of
* CAN frames, as well as configuration of the controller. The driver is simply a
* pass-through mechanism between a protocol stack and the CAN. A single device
* driver can support multiple CANs.
*
* Since the driver is a simple pass-through mechanism between a protocol stack
* and the CAN, no assembly or disassembly of CAN frames is done at the
* driver-level. This assumes that the protocol stack passes a correctly
* formatted CAN frame to the driver for transmission, and that the driver
* does not validate the contents of an incoming frame
*
* <b>Operation Modes</b>
*
* The CAN controller supports the following modes of operation:
* - <b>Configuration Mode</b>: In this mode the CAN timing parameters and
* Baud Rate Pre-scalar parameters can be changed. In this mode the CAN
* controller loses synchronization with the CAN bus and drives a
* constant recessive bit on the bus line. The Error Counter Register are
* reset. The CAN controller does not receive or transmit any messages
* even if there are pending transmit requests from the TX FIFO or the TX
* High Priority Buffer. The Storage FIFOs and the CAN configuration
* registers are still accessible.
* - <b>Normal Mode</b>:In Normal Mode the CAN controller participates in bus
* communication, by transmitting and receiving messages.
* - <b>Sleep Mode</b>: In Sleep Mode the CAN Controller does not transmit any
* messages. However, if any other node transmits a message, then the CAN
* Controller receives the transmitted message and exits from Sleep Mode.
* If there are new transmission requests from either the TX FIFO or the
* TX High Priority Buffer when the CAN Controller is in Sleep Mode, these
* requests are not serviced, and the CAN Controller continues to remain
* in Sleep Mode. Interrupts are generated when the CAN controller enters
* Sleep mode or Wakes up from Sleep mode.
* - <b>Loop Back Mode</b>: In Loop Back mode, the CAN controller transmits a
* recessive bit stream on to the CAN Bus. Any message that is transmitted
* is looped back to the �Rx� line and acknowledged. The CAN controller
* thus receives any message that it transmits. It does not participate in
* normal bus communication and does not receive any messages that are
* transmitted by other CAN nodes. This mode is used for diagnostic
* purposes.
* - <b>Snoop Mode</b>: In Snoop mode, the CAN controller transmits a
* recessive bit stream on to the CAN Bus and does not participate
* in normal bus communication but receives messages that are transmitted
* by other CAN nodes. This mode is used for diagnostic purposes.
*
*
* <b>Buffer Alignment</b>
*
* It is important to note that frame buffers passed to the driver must be
* 32-bit aligned.
*
* <b>Receive Address Filtering</b>
*
* The device can be set to accept frames whose Identifiers match any of the
* 4 filters set in the Acceptance Filter Mask/ID registers.
*
* The incoming Identifier is masked with the bits in the Acceptance Filter Mask
* Register. This value is compared with the result of masking the bits in the
* Acceptance Filter ID Register with the Acceptance Filter Mask Register. If
* both these values are equal, the message will be stored in the RX FIFO.
*
* Acceptance Filtering is performed by each of the defined acceptance filters.
* If the incoming identifier passes through any acceptance filter then the
* frame is stored in the RX FIFO.
*
* If the Accpetance Filters are not set up then all the received messages are
* stroed in the RX FIFO.
*
* <b>PHY Communication</b>
*
* This driver does not provide any mechanism for directly programming PHY.
*
* <b>Interrupts</b>
*
* The driver has no dependencies on the interrupt controller. The driver
* provides an interrupt handler. User of this driver needs to provide
* callback functions. An interrupt handler example is available with
* the driver.
*
* <b>Threads</b>
*
* This driver is not thread safe. Any needs for threads or thread mutual
* exclusion must be satisfied by the layer above this driver.
*
* <b>Device Reset</b>
*
* Bus Off interrupt that can occur in the device requires a device reset.
* The user is responsible for resetting the device and re-configuring it
* based on its needs (the driver does not save the current configuration).
* When integrating into an RTOS, these reset and re-configure obligations are
* taken care of by the OS adapter software if it exists for that RTOS.
*
* <b>Device Configuration</b>
*
* The device can be configured in various ways during the FPGA implementation
* process. Configuration parameters are stored in the xcanps_g.c files.
* A table is defined where each entry contains configuration information
* for a CAN device. This information includes such things as the base address
* of the memory-mapped device.
*
* <b>Asserts</b>
*
* Asserts are used within all Xilinx drivers to enforce constraints on argument
* values. Asserts can be turned off on a system-wide basis by defining, at
* compile time, the NDEBUG identifier. By default, asserts are turned on and it
* is recommended that users leave asserts on during development.
*
* <b>Building the driver</b>
*
* The XCanPs driver is composed of several source files. This allows the user
* to build and link only those parts of the driver that are necessary.
* <br><br>
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ----- -------- -----------------------------------------------
* 1.00a xd/sv 01/12/10 First release
* 1.01a bss 12/27/11 Added the APIs XCanPs_SetTxIntrWatermark and
* XCanPs_GetTxIntrWatermark.
* Updated the Register/bit definitions
* Changed XCANPS_RXFWIR_RXFLL_MASK to XCANPS_WIR_FW_MASK
* Changed XCANPS_RXWIR_OFFSET to XCANPS_WIR_OFFSET
* Added XCANPS_IXR_TXFEMP_MASK for Tx Fifo Empty
* Changed XCANPS_IXR_RXFLL_MASK to
* XCANPS_IXR_RXFWMFLL_MASK
* Changed
* XCANPS_TXBUF_ID_OFFSET to XCANPS_TXHPB_ID_OFFSET
* XCANPS_TXBUF_DLC_OFFSET to XCANPS_TXHPB_DLC_OFFSET
* XCANPS_TXBUF_DW1_OFFSET to XCANPS_TXHPB_DW1_OFFSET
* XCANPS_TXBUF_DW2_OFFSET to XCANPS_TXHPB_DW2_OFFSET
* 2.1 adk 23/08/14 Fixed CR:798792 Peripheral test for CANPS IP in
* SDK claims a 40kbps baud rate but it's not.
* </pre>
*
******************************************************************************/
#ifndef XCANPS_H /* prevent circular inclusions */
#define XCANPS_H /* by using protection macros */
#ifdef __cplusplus
extern "C" {
#endif
/***************************** Include Files *********************************/
#include "xstatus.h"
#include "xcanps_hw.h"
/************************** Constant Definitions *****************************/
/** @name CAN operation modes
* @{
*/
#define XCANPS_MODE_CONFIG 0x00000001 /**< Configuration mode */
#define XCANPS_MODE_NORMAL 0x00000002 /**< Normal mode */
#define XCANPS_MODE_LOOPBACK 0x00000004 /**< Loop Back mode */
#define XCANPS_MODE_SLEEP 0x00000008 /**< Sleep mode */
#define XCANPS_MODE_SNOOP 0x00000010 /**< Snoop mode */
/* @} */
/** @name Callback identifiers used as parameters to XCanPs_SetHandler()
* @{
*/
#define XCANPS_HANDLER_SEND 1 /**< Handler type for frame sending interrupt */
#define XCANPS_HANDLER_RECV 2 /**< Handler type for frame reception interrupt*/
#define XCANPS_HANDLER_ERROR 3 /**< Handler type for error interrupt */
#define XCANPS_HANDLER_EVENT 4 /**< Handler type for all other interrupts */
/* @} */
/**************************** Type Definitions *******************************/
/**
* This typedef contains configuration information for a device.
*/
typedef struct {
u16 DeviceId; /**< Unique ID of device */
u32 BaseAddr; /**< Register base address */
} XCanPs_Config;
/******************************************************************************/
/**
* Callback type for frame sending and reception interrupts.
*
* @param CallBackRef is a callback reference passed in by the upper layer
* when setting the callback functions, and passed back to the
* upper layer when the callback is invoked.
*******************************************************************************/
typedef void (*XCanPs_SendRecvHandler) (void *CallBackRef);
/******************************************************************************/
/**
* Callback type for error interrupt.
*
* @param CallBackRef is a callback reference passed in by the upper layer
* when setting the callback functions, and passed back to the
* upper layer when the callback is invoked.
* @param ErrorMask is a bit mask indicating the cause of the error. Its
* value equals 'OR'ing one or more XCANPS_ESR_* values defined in
* xcanps_hw.h
*******************************************************************************/
typedef void (*XCanPs_ErrorHandler) (void *CallBackRef, u32 ErrorMask);
/******************************************************************************/
/**
* Callback type for all kinds of interrupts except sending frame interrupt,
* receiving frame interrupt, and error interrupt.
*
* @param CallBackRef is a callback reference passed in by the upper layer
* when setting the callback functions, and passed back to the
* upper layer when the callback is invoked.
* @param Mask is a bit mask indicating the pending interrupts. Its value
* equals 'OR'ing one or more XCANPS_IXR_* defined in xcanps_hw.h
*******************************************************************************/
typedef void (*XCanPs_EventHandler) (void *CallBackRef, u32 Mask);
/**
* The XCanPs driver instance data. The user is required to allocate a
* variable of this type for every CAN device in the system. A pointer
* to a variable of this type is then passed to the driver API functions.
*/
typedef struct {
XCanPs_Config CanConfig; /**< Device configuration */
u32 IsReady; /**< Device is initialized and ready */
/**
* Callback and callback reference for TXOK interrupt.
*/
XCanPs_SendRecvHandler SendHandler;
void *SendRef;
/**
* Callback and callback reference for RXOK/RXNEMP/RXFLL interrupts.
*/
XCanPs_SendRecvHandler RecvHandler;
void *RecvRef;
/**
* Callback and callback reference for ERROR interrupt.
*/
XCanPs_ErrorHandler ErrorHandler;
void *ErrorRef;
/**
* Callback and callback reference for RXOFLW/RXUFLW/TXBFLL/TXFLL/
* Wakeup/Sleep/Bus off/ARBLST interrupts.
*/
XCanPs_EventHandler EventHandler;
void *EventRef;
} XCanPs;
/***************** Macros (Inline Functions) Definitions *********************/
/****************************************************************************/
/**
*
* This macro checks if the transmission is complete.
*
* @param InstancePtr is a pointer to the XCanPs instance.
*
* @return
* - TRUE if the transmission is done.
* - FALSE if the transmission is not done.
*
* @note C-Style signature:
* int XCanPs_IsTxDone(XCanPs *InstancePtr);
*
*******************************************************************************/
#define XCanPs_IsTxDone(InstancePtr) \
((XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr), \
XCANPS_ISR_OFFSET) & XCANPS_IXR_TXOK_MASK) ? TRUE : FALSE)
/****************************************************************************/
/**
*
* This macro checks if the transmission FIFO is full.
*
* @param InstancePtr is a pointer to the XCanPs instance.
*
* @return
* - TRUE if TX FIFO is full.
* - FALSE if the TX FIFO is NOT full.
*
* @note C-Style signature:
* int XCanPs_IsTxFifoFull(XCanPs *InstancePtr);
*
*****************************************************************************/
#define XCanPs_IsTxFifoFull(InstancePtr) \
((XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr), \
XCANPS_SR_OFFSET) & XCANPS_SR_TXFLL_MASK) ? TRUE : FALSE)
/****************************************************************************/
/**
*
* This macro checks if the Transmission High Priority Buffer is full.
*
* @param InstancePtr is a pointer to the XCanPs instance.
*
* @return
* - TRUE if the TX High Priority Buffer is full.
* - FALSE if the TX High Priority Buffer is NOT full.
*
* @note C-Style signature:
* int XCanPs_IsHighPriorityBufFull(XCanPs *InstancePtr);
*
*****************************************************************************/
#define XCanPs_IsHighPriorityBufFull(InstancePtr) \
((XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr), \
XCANPS_SR_OFFSET) & XCANPS_SR_TXBFLL_MASK) ? TRUE : FALSE)
/****************************************************************************/
/**
*
* This macro checks if the receive FIFO is empty.
*
* @param InstancePtr is a pointer to the XCanPs instance.
*
* @return
* - TRUE if RX FIFO is empty.
* - FALSE if the RX FIFO is NOT empty.
*
* @note C-Style signature:
* int XCanPs_IsRxEmpty(XCanPs *InstancePtr);
*
*****************************************************************************/
#define XCanPs_IsRxEmpty(InstancePtr) \
((XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr), \
XCANPS_ISR_OFFSET) & XCANPS_IXR_RXNEMP_MASK) ? FALSE : TRUE)
/****************************************************************************/
/**
*
* This macro checks if the CAN device is ready for the driver to change
* Acceptance Filter Identifier Registers (AFIR) and Acceptance Filter Mask
* Registers (AFMR).
*
* AFIR and AFMR for a filter are changeable only after the filter is disabled
* and this routine returns FALSE. The filter can be disabled using the
* XCanPs_AcceptFilterDisable function.
*
* Use the XCanPs_Accept_* functions for configuring the acceptance filters.
*
* @param InstancePtr is a pointer to the XCanPs instance.
*
* @return
* - TRUE if the device is busy and NOT ready to accept writes to
* AFIR and AFMR.
* - FALSE if the device is ready to accept writes to AFIR and
* AFMR.
*
* @note C-Style signature:
* int XCanPs_IsAcceptFilterBusy(XCanPs *InstancePtr);
*
*****************************************************************************/
#define XCanPs_IsAcceptFilterBusy(InstancePtr) \
((XCanPs_ReadReg(((InstancePtr)->CanConfig.BaseAddr), \
XCANPS_SR_OFFSET) & XCANPS_SR_ACFBSY_MASK) ? TRUE : FALSE)
/****************************************************************************/
/**
*
* This macro calculates CAN message identifier value given identifier field
* values.
*
* @param StandardId contains Standard Message ID value.
* @param SubRemoteTransReq contains Substitute Remote Transmission
* Request value.
* @param IdExtension contains Identifier Extension value.
* @param ExtendedId contains Extended Message ID value.
* @param RemoteTransReq contains Remote Transmission Request value.
*
* @return Message Identifier value.
*
* @note C-Style signature:
* u32 XCanPs_CreateIdValue(u32 StandardId,
* u32 SubRemoteTransReq,
* u32 IdExtension, u32 ExtendedId,
* u32 RemoteTransReq);
*
* Read the CAN specification for meaning of each parameter.
*
*****************************************************************************/
#define XCanPs_CreateIdValue(StandardId, SubRemoteTransReq, IdExtension, \
ExtendedId, RemoteTransReq) \
((((StandardId) << XCANPS_IDR_ID1_SHIFT) & XCANPS_IDR_ID1_MASK) | \
(((SubRemoteTransReq) << XCANPS_IDR_SRR_SHIFT) & XCANPS_IDR_SRR_MASK)|\
(((IdExtension) << XCANPS_IDR_IDE_SHIFT) & XCANPS_IDR_IDE_MASK) | \
(((ExtendedId) << XCANPS_IDR_ID2_SHIFT) & XCANPS_IDR_ID2_MASK) | \
((RemoteTransReq) & XCANPS_IDR_RTR_MASK))
/****************************************************************************/
/**
*
* This macro calculates value for Data Length Code register given Data
* Length Code value.
*
* @param DataLengCode indicates Data Length Code value.
*
* @return Value that can be assigned to Data Length Code register.
*
* @note C-Style signature:
* u32 XCanPs_CreateDlcValue(u32 DataLengCode);
*
* Read the CAN specification for meaning of Data Length Code.
*
*****************************************************************************/
#define XCanPs_CreateDlcValue(DataLengCode) \
(((DataLengCode) << XCANPS_DLCR_DLC_SHIFT) & XCANPS_DLCR_DLC_MASK)
/****************************************************************************/
/**
*
* This macro clears the timestamp in the Timestamp Control Register.
*
* @param InstancePtr is a pointer to the XCanPs instance.
*
* @return None.
*
* @note C-Style signature:
* void XCanPs_ClearTimestamp(XCanPs *InstancePtr);
*
*****************************************************************************/
#define XCanPs_ClearTimestamp(InstancePtr) \
XCanPs_WriteReg((InstancePtr)->CanConfig.BaseAddr, \
XCANPS_TCR_OFFSET, XCANPS_TCR_CTS_MASK)
/************************** Function Prototypes ******************************/
/*
* Functions in xcanps.c
*/
int XCanPs_CfgInitialize(XCanPs *InstancePtr, XCanPs_Config *ConfigPtr,
u32 EffectiveAddr);
void XCanPs_Reset(XCanPs *InstancePtr);
u8 XCanPs_GetMode(XCanPs *InstancePtr);
void XCanPs_EnterMode(XCanPs *InstancePtr, u8 OperationMode);
u32 XCanPs_GetStatus(XCanPs *InstancePtr);
void XCanPs_GetBusErrorCounter(XCanPs *InstancePtr, u8 *RxErrorCount,
u8 *TxErrorCount);
u32 XCanPs_GetBusErrorStatus(XCanPs *InstancePtr);
void XCanPs_ClearBusErrorStatus(XCanPs *InstancePtr, u32 Mask);
int XCanPs_Send(XCanPs *InstancePtr, u32 *FramePtr);
int XCanPs_Recv(XCanPs *InstancePtr, u32 *FramePtr);
int XCanPs_SendHighPriority(XCanPs *InstancePtr, u32 *FramePtr);
void XCanPs_AcceptFilterEnable(XCanPs *InstancePtr, u32 FilterIndexes);
void XCanPs_AcceptFilterDisable(XCanPs *InstancePtr, u32 FilterIndexes);
u32 XCanPs_AcceptFilterGetEnabled(XCanPs *InstancePtr);
int XCanPs_AcceptFilterSet(XCanPs *InstancePtr, u32 FilterIndex,
u32 MaskValue, u32 IdValue);
void XCanPs_AcceptFilterGet(XCanPs *InstancePtr, u32 FilterIndex,
u32 *MaskValue, u32 *IdValue);
int XCanPs_SetBaudRatePrescaler(XCanPs *InstancePtr, u8 Prescaler);
u8 XCanPs_GetBaudRatePrescaler(XCanPs *InstancePtr);
int XCanPs_SetBitTiming(XCanPs *InstancePtr, u8 SyncJumpWidth,
u8 TimeSegment2, u8 TimeSegment1);
void XCanPs_GetBitTiming(XCanPs *InstancePtr, u8 *SyncJumpWidth,
u8 *TimeSegment2, u8 *TimeSegment1);
int XCanPs_SetRxIntrWatermark(XCanPs *InstancePtr, u8 Threshold);
u8 XCanPs_GetRxIntrWatermark(XCanPs *InstancePtr);
/*
* Diagnostic functions in xcanps_selftest.c
*/
int XCanPs_SelfTest(XCanPs *InstancePtr);
/*
* Functions in xcanps_intr.c
*/
void XCanPs_IntrEnable(XCanPs *InstancePtr, u32 Mask);
void XCanPs_IntrDisable(XCanPs *InstancePtr, u32 Mask);
u32 XCanPs_IntrGetEnabled(XCanPs *InstancePtr);
u32 XCanPs_IntrGetStatus(XCanPs *InstancePtr);
void XCanPs_IntrClear(XCanPs *InstancePtr, u32 Mask);
void XCanPs_IntrHandler(void *InstancePtr);
int XCanPs_SetHandler(XCanPs *InstancePtr, u32 HandlerType,
void *CallBackFunc, void *CallBackRef);
/*
* Functions in xcanps_sinit.c
*/
XCanPs_Config *XCanPs_LookupConfig(u16 DeviceId);
#ifdef __cplusplus
}
#endif
#endif /* end of protection macro */