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/* ----------------------------------------------------------------------------

 *         ATMEL Microcontroller Software Support

 * ----------------------------------------------------------------------------

 * Copyright (c) 2008, Atmel Corporation

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * - Redistributions of source code must retain the above copyright notice,

 * this list of conditions and the disclaimer below.

 *

 * Atmel's name may not be used to endorse or promote products derived from

 * this software without specific prior written permission.

 *

 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE

 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.

 * ----------------------------------------------------------------------------

 */

//------------------------------------------------------------------------------

//         Headers

//------------------------------------------------------------------------------

#include <board.h>

#include <pio/pio.h>

#include <utility/trace.h>

#include <aic/aic.h>

#include "can.h"

//------------------------------------------------------------------------------

//         Local definitions

//------------------------------------------------------------------------------

// CAN state

#define CAN_DISABLED       0

#define CAN_HALTED         1

#define CAN_IDLE           2

#define CAN_SENDING        3

#define CAN_RECEIVING      4

// MOT: Mailbox Object Type

#define CAN_MOT_DISABLE    0 // Mailbox is disabled

#define CAN_MOT_RECEPT     1 // Reception Mailbox

#define CAN_MOT_RECEPT_OW  2 // Reception mailbox with overwrite

#define CAN_MOT_TRANSMIT   3 // Transmit mailbox

#define CAN_MOT_CONSUMER   4 // Consumer mailbox

#define CAN_MOT_PRODUCER   5 // Producer mailbox

//------------------------------------------------------------------------------

//         Local variables

//------------------------------------------------------------------------------

#if defined (PINS_CAN_TRANSCEIVER_TXD)

static const Pin pins_can_transceiver_txd[] = {PINS_CAN_TRANSCEIVER_TXD};

#endif

#if defined (PINS_CAN_TRANSCEIVER_RXD)

static const Pin pins_can_transceiver_rxd[] = {PINS_CAN_TRANSCEIVER_RXD};

#endif

static const Pin pin_can_transceiver_rs   = PIN_CAN_TRANSCEIVER_RS;

#if defined (PIN_CAN_TRANSCEIVER_RXEN)

static const Pin pin_can_transceiver_rxen = PIN_CAN_TRANSCEIVER_RXEN;

#endif

static CanTransfer *pCAN0Transfer=NULL;

#ifdef AT91C_BASE_CAN1

static CanTransfer *pCAN1Transfer=NULL;

#endif

//------------------------------------------------------------------------------

//         Local functions

//------------------------------------------------------------------------------

//------------------------------------------------------------------------------

/// CAN Error Detection

/// \param status     error type

/// \param can_number can nulber

//------------------------------------------------------------------------------

static void CAN_ErrorHandling( unsigned int status, unsigned char can_number)

{

    if( (status&AT91C_CAN_ERRA) ==  AT91C_CAN_ERRA) {

        trace_LOG( trace_ERROR, "-E- (CAN) CAN is in active Error Active mode\n\r");

    }

    else if( (status&AT91C_CAN_ERRP) ==  AT91C_CAN_ERRP) {

        trace_LOG( trace_ERROR, "-E- (CAN) CAN is in Error Passive mode\n\r");

    }

    else if( (status&AT91C_CAN_BOFF) ==  AT91C_CAN_BOFF) {

        trace_LOG( trace_ERROR, "-E- (CAN) CAN is in Buff Off mode\n\r");

        // CAN reset

        trace_LOG( trace_ERROR, "-E- (CAN) CAN%d reset\n\r", can_number);

        // CAN Controller Disable

        if (can_number == 0) {

            AT91C_BASE_CAN0->CAN_MR &= ~AT91C_CAN_CANEN;

            // CAN Controller Enable

            AT91C_BASE_CAN0->CAN_MR |= AT91C_CAN_CANEN;

        }

#ifdef AT91C_BASE_CAN1

        else if (can_number == 1) {

            AT91C_BASE_CAN1->CAN_MR &= ~AT91C_CAN_CANEN;

            // CAN Controller Enable

            AT91C_BASE_CAN1->CAN_MR |= AT91C_CAN_CANEN;

        }

#endif

    }

    // Error for Frame dataframe

    // CRC error

    if( (status&AT91C_CAN_CERR) ==  AT91C_CAN_CERR) {

        trace_LOG( trace_ERROR, "-E- (CAN) CRC Error\n\r");

    }

    // Bit-stuffing error

    else if( (status&AT91C_CAN_SERR) ==  AT91C_CAN_SERR) {

        trace_LOG( trace_ERROR, "-E- (CAN) Stuffing Error\n\r");

    }

    // Bit error

    else if( (status&AT91C_CAN_BERR) ==  AT91C_CAN_BERR) {

        trace_LOG( trace_ERROR, "-E- (CAN) Bit Error\n\r");

    }

    // Form error

    else if( (status&AT91C_CAN_FERR) ==  AT91C_CAN_FERR) {

        trace_LOG( trace_ERROR, "-E- (CAN) Form Error\n\r");

    }

    // Acknowledgment error

    else if( (status&AT91C_CAN_AERR) ==  AT91C_CAN_AERR) {

        trace_LOG( trace_ERROR, "-E- (CAN) Acknowledgment Error\n\r");

    }

    // Error interrupt handler

    // Represent the current status of the CAN bus and are not latched.

    // See CAN, par. Error Interrupt Handler

    // AT91C_CAN_WARN

    // AT91C_CAN_ERRA

}

//------------------------------------------------------------------------------

// Generic CAN Interrupt handler

/// \param can_number can nulber

//------------------------------------------------------------------------------

static void CAN_Handler( unsigned char can_number )

{

    AT91PS_CAN base_can;

    AT91PS_CAN_MB CAN_Mailbox;

    unsigned int status;

    unsigned int can_msr;

    unsigned int* pCan_mcr;

    unsigned int message_mode;

    unsigned char numMailbox;

    unsigned char state0;

    unsigned char state1;

    if( can_number == 0 ) {

        base_can = AT91C_BASE_CAN0;

        CAN_Mailbox = AT91C_BASE_CAN0_MB0;

        state0 = pCAN0Transfer->state;

    }

#ifdef AT91C_BASE_CAN1

    else {

        base_can = AT91C_BASE_CAN1;

        CAN_Mailbox = AT91C_BASE_CAN1_MB0;

        state1 = pCAN1Transfer->state;

    }

#endif

    status = (base_can->CAN_SR) & (base_can->CAN_IMR);

    base_can->CAN_IDR = status;

    trace_LOG( trace_DEBUG, "CAN0 status=0x%X\n\r", status);

    if(status & AT91C_CAN_WAKEUP) {

        if( can_number == 0 ) {

            pCAN0Transfer->test_can = AT91C_TEST_OK;

            pCAN0Transfer->state = CAN_IDLE;

        }

#ifdef AT91C_BASE_CAN1

        else {

            pCAN1Transfer->test_can = AT91C_TEST_OK;

            pCAN1Transfer->state = CAN_IDLE;

        }

#endif

    }

    // Mailbox event ?

    else if ((status&0x0000FFFF) != 0) {

        trace_LOG( trace_DEBUG, "Mailbox event\n\r");

        // Handle Mailbox interrupts

        for (numMailbox = 0; numMailbox < NUM_MAILBOX_MAX; numMailbox++) {

            can_msr = *(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x10+(0x20*numMailbox)));

            if ((AT91C_CAN_MRDY & can_msr) == AT91C_CAN_MRDY) {

                // Mailbox object type

                message_mode =  ((*(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x00+(0x20*numMailbox))))>>24)&0x7;

                trace_LOG( trace_DEBUG, "message_mode 0x%X\n\r", message_mode);

                trace_LOG( trace_DEBUG, "numMailbox 0x%X\n\r", numMailbox);

                if( message_mode == 0 ) {

                    trace_LOG( trace_ERROR, "-E-Error in MOT\n\r");

                }

                else if( ( message_mode == CAN_MOT_RECEPT )

                      || ( message_mode == CAN_MOT_RECEPT_OW )

                      || ( message_mode == CAN_MOT_PRODUCER ) ) {

                    trace_LOG( trace_DEBUG, "Mailbox is in RECEPTION\n\r");

                    trace_LOG( trace_DEBUG, "Length 0x%X\n\r", (can_msr>>16)&0xF);

                    trace_LOG( trace_DEBUG, "CAN_MB_MID 0x%X\n\r", ((*(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x08+(0x20*numMailbox)))&AT91C_CAN_MIDvA)>>18));

                    trace_LOG( trace_DEBUG, "can_number %d\n\r", can_number);

                    if( can_number == 0 ) {

                        //CAN_MB_MDLx

                        pCAN0Transfer->data_low_reg =

                           (*(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x14+(0x20*numMailbox))));

                        //CAN_MB_MDHx

                        pCAN0Transfer->data_high_reg =

                           (*(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x18+(0x20*numMailbox))));

                        pCAN0Transfer->size = (can_msr>>16)&0xF;

                        pCAN0Transfer->mailbox_number = numMailbox;

                        state0 = CAN_IDLE;

                    }

#ifdef AT91C_BASE_CAN1

                    else {

                        //CAN_MB_MDLx

                        pCAN1Transfer->data_low_reg =

                           (*(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x14+(0x20*numMailbox))));

                        //CAN_MB_MDHx

                        pCAN1Transfer->data_high_reg =

                           (*(unsigned int*)((unsigned int)CAN_Mailbox+(unsigned int)(0x18+(0x20*numMailbox))));

                        pCAN1Transfer->size = (can_msr>>16)&0xF;

                        pCAN1Transfer->mailbox_number = numMailbox;

                        state1 = CAN_IDLE;

                    }

#endif

                    // Message Data has been received

                    pCan_mcr = (unsigned int*)((unsigned int)CAN_Mailbox+0x1C+(0x20*numMailbox));

                    *pCan_mcr = AT91C_CAN_MTCR;

                }

                else {

                    trace_LOG( trace_DEBUG, "Mailbox is in TRANSMIT\n\r");

                    trace_LOG( trace_DEBUG, "Length 0x%X\n\r", (can_msr>>16)&0xF);

                    trace_LOG( trace_DEBUG, "can_number %d\n\r", can_number);

                    if( can_number == 0 ) {

                        state0 = CAN_IDLE;

                    }

                    else {

                        state1 = CAN_IDLE;

                    }

                }

            }

        }

        if( can_number == 0 ) {

            pCAN0Transfer->state = state0;

        }

#ifdef AT91C_BASE_CAN1

        else {

            pCAN1Transfer->state = state1;

        }

#endif

    }

    if ((status&0xFFCF0000) != 0) {

        CAN_ErrorHandling(status, 0);

    }

}

//------------------------------------------------------------------------------

/// CAN 0 Interrupt handler

//------------------------------------------------------------------------------

static void CAN0_Handler(void)

{

    CAN_Handler( 0 );

}

//------------------------------------------------------------------------------

/// CAN 1 Interrupt handler

//------------------------------------------------------------------------------

#if defined AT91C_BASE_CAN1

static void CAN1_Handler(void)

{

    CAN_Handler( 1 );

}

#endif

//------------------------------------------------------------------------------

//         Global functions

//------------------------------------------------------------------------------

//------------------------------------------------------------------------------

/// Configure the corresponding mailbox

/// \param pTransfer can transfer structure

//------------------------------------------------------------------------------

void CAN_InitMailboxRegisters( CanTransfer *pTransfer )

{

    AT91PS_CAN    base_can;

    AT91PS_CAN_MB CAN_Mailbox;

    if( pTransfer->can_number == 0 ) {

        base_can = AT91C_BASE_CAN0;

        CAN_Mailbox = AT91C_BASE_CAN0_MB0;

    }

#ifdef AT91C_BASE_CAN1

    else {

        base_can = AT91C_BASE_CAN1;

        CAN_Mailbox = AT91C_BASE_CAN1_MB0;

    }

#endif

    CAN_Mailbox = (AT91PS_CAN_MB)((unsigned int)CAN_Mailbox+(unsigned int)(0x20*pTransfer->mailbox_number));

    pTransfer->mailbox_in_use |= 1<<(pTransfer->mailbox_number);

    // MailBox Control Register

    CAN_Mailbox->CAN_MB_MCR = 0x0;

    // MailBox Mode Register

    CAN_Mailbox->CAN_MB_MMR = 0x00;

    // CAN Message Acceptance Mask Register

    CAN_Mailbox->CAN_MB_MAM = pTransfer->acceptance_mask_reg;

    // MailBox ID Register

    // Disable the mailbox before writing to CAN_MIDx registers

    if( pTransfer->identifier != 0 ) {

        CAN_Mailbox->CAN_MB_MAM |= AT91C_CAN_MIDE;

        CAN_Mailbox->CAN_MB_MID = pTransfer->identifier;

    }

    else {

        CAN_Mailbox->CAN_MB_MAM &= ~AT91C_CAN_MIDE;

    }

    // MailBox Mode Register

    CAN_Mailbox->CAN_MB_MMR = pTransfer->mode_reg;

    // MailBox Data Low Register

    CAN_Mailbox->CAN_MB_MDL = pTransfer->data_low_reg;

    // MailBox Data High Register

    CAN_Mailbox->CAN_MB_MDH = pTransfer->data_high_reg;

    // MailBox Control Register

    CAN_Mailbox->CAN_MB_MCR = pTransfer->control_reg;

}

//------------------------------------------------------------------------------

/// Reset the MBx

//------------------------------------------------------------------------------

void CAN_ResetAllMailbox( void )

{

    unsigned char i;

#if defined (AT91C_BASE_CAN0_MB0)

    CAN_ResetTransfer( pCAN0Transfer );

    for( i=0; i<8; i++ ) {

        pCAN0Transfer->can_number = 0;

        pCAN0Transfer->mailbox_number = i;

        pCAN0Transfer->mode_reg = AT91C_CAN_MOT_DIS;

        pCAN0Transfer->acceptance_mask_reg = 0;

        pCAN0Transfer->identifier = 0;

        pCAN0Transfer->data_low_reg = 0x00000000;

        pCAN0Transfer->data_high_reg = 0x00000000;

        pCAN0Transfer->control_reg = 0x00000000;

        CAN_InitMailboxRegisters( pCAN0Transfer );

    }

#endif

#if defined (AT91C_BASE_CAN0_MB8)

    for( i=0; i<8; i++ ) {

        pCAN0Transfer->can_number = 0;

        pCAN0Transfer->mailbox_number = i+8;

        pCAN0Transfer->mode_reg = AT91C_CAN_MOT_DIS;

        pCAN0Transfer->acceptance_mask_reg = 0;

        pCAN0Transfer->identifier = 0;

        pCAN0Transfer->data_low_reg = 0x00000000;

        pCAN0Transfer->data_high_reg = 0x00000000;

        pCAN0Transfer->control_reg = 0x00000000;

        CAN_InitMailboxRegisters( pCAN0Transfer );

    }

#endif

#if defined (AT91C_BASE_CAN1_MB0)

    if( pCAN1Transfer != NULL ) {

        CAN_ResetTransfer( pCAN1Transfer );

        for( i=0; i<8; i++ ) {

            pCAN1Transfer->can_number = 1;

            pCAN1Transfer->mailbox_number = i;

            pCAN1Transfer->mode_reg = AT91C_CAN_MOT_DIS;

            pCAN1Transfer->acceptance_mask_reg = 0;

            pCAN1Transfer->identifier = 0;

            pCAN1Transfer->data_low_reg = 0x00000000;

            pCAN1Transfer->data_high_reg = 0x00000000;

            pCAN1Transfer->control_reg = 0x00000000;

            CAN_InitMailboxRegisters( pCAN1Transfer );

        }

    }

#endif

#if defined (AT91C_BASE_CAN1_MB8)

    if( pCAN1Transfer != NULL ) {

        for( i=0; i<8; i++ ) {

            pCAN1Transfer->can_number = 1;

            pCAN1Transfer->mailbox_number = i+8;

            pCAN1Transfer->mode_reg = AT91C_CAN_MOT_DIS;

            pCAN1Transfer->acceptance_mask_reg = 0;

            pCAN1Transfer->identifier = 0;

            pCAN1Transfer->data_low_reg = 0x00000000;

            pCAN1Transfer->data_high_reg = 0x00000000;

            pCAN1Transfer->control_reg = 0x00000000;

            CAN_InitMailboxRegisters( pCAN1Transfer );

        }

    }

#endif

}

//------------------------------------------------------------------------------

/// CAN reset Transfer descriptor

/// \param pTransfer can transfer structure

//------------------------------------------------------------------------------

void CAN_ResetTransfer( CanTransfer *pTransfer )

{

    pTransfer->state = CAN_IDLE;

    pTransfer->can_number = 0;

    pTransfer->mailbox_number = 0;

    pTransfer->test_can = 0;

    pTransfer->mode_reg = 0;

    pTransfer->acceptance_mask_reg = 0;

    pTransfer->identifier = 0;

    pTransfer->data_low_reg = 0;

    pTransfer->data_high_reg = 0;

    pTransfer->control_reg = 0;

    pTransfer->mailbox_in_use = 0;

    pTransfer->size = 0;

}

//------------------------------------------------------------------------------

/// Wait for CAN synchronisation

/// \return return 1 for good initialisation, otherwise return 0

//------------------------------------------------------------------------------

static unsigned char CAN_Synchronisation( void )

{

    unsigned int tick=0;

    trace_LOG( trace_INFO, "CAN_Synchronisation\n\r");

    pCAN0Transfer->test_can = AT91C_TEST_NOK;

#ifdef AT91C_BASE_CAN1

    if( pCAN1Transfer != NULL ) {

        pCAN1Transfer->test_can = AT91C_TEST_NOK;

    }

#endif

    // Enable CAN and Wait for WakeUp Interrupt

    AT91C_BASE_CAN0->CAN_IER = AT91C_CAN_WAKEUP;

    // CAN Controller Enable

    AT91C_BASE_CAN0->CAN_MR = AT91C_CAN_CANEN;

    // Enable Autobaud/Listen mode

    // dangerous, CAN not answer in this mode

     while( (pCAN0Transfer->test_can != AT91C_TEST_OK)

         && (tick < AT91C_CAN_TIMEOUT) ) {

        tick++;

    }

    if (tick == AT91C_CAN_TIMEOUT) {

        trace_LOG( trace_ERROR, "-E- CAN0 Initialisations FAILED\n\r");

        return 0;

    } else {

        trace_LOG( trace_INFO, "-I- CAN0 Initialisations Completed\n\r");

    }

#if defined AT91C_BASE_CAN1

    if( pCAN1Transfer != NULL ) {

        AT91C_BASE_CAN1->CAN_IER = AT91C_CAN_WAKEUP;

        // CAN Controller Enable

        AT91C_BASE_CAN1->CAN_MR = AT91C_CAN_CANEN;

        tick = 0;

        // Wait for WAKEUP flag raising <=> 11-recessive-bit were scanned by the transceiver

        while( ((pCAN1Transfer->test_can != AT91C_TEST_OK))

            && (tick < AT91C_CAN_TIMEOUT) ) {

            tick++;

        }

        if (tick == AT91C_CAN_TIMEOUT) {

            trace_LOG( trace_ERROR, "-E- CAN1 Initialisations FAILED\n\r");

            return 0;

        } else {

            trace_LOG( trace_INFO, "-I- CAN1 Initialisations Completed\n\r");

        }

    }

#endif

    return 1;

}

//------------------------------------------------------------------------------

/// Write a CAN transfer

/// \param pTransfer can transfer structure

/// \return return CAN_STATUS_SUCCESS if command passed, otherwise 

///         return CAN_STATUS_LOCKED

//------------------------------------------------------------------------------

unsigned char CAN_Write( CanTransfer *pTransfer )

{

    AT91PS_CAN base_can;

    if (pTransfer->state == CAN_RECEIVING)  {

        pTransfer->state = CAN_IDLE;

    }

    if (pTransfer->state != CAN_IDLE)  {

        return CAN_STATUS_LOCKED;

    }

    trace_LOG( trace_DEBUG, "CAN_Write\n\r");

    pTransfer->state = CAN_SENDING;

    if( pTransfer->can_number == 0 ) {

        base_can = AT91C_BASE_CAN0;

    }

#ifdef AT91C_BASE_CAN1

    else {

        base_can = AT91C_BASE_CAN1;

    }

#endif

    base_can->CAN_TCR = pTransfer->mailbox_in_use;

    base_can->CAN_IER = pTransfer->mailbox_in_use;

    return CAN_STATUS_SUCCESS;

}

//------------------------------------------------------------------------------

/// Read a CAN transfer

/// \param pTransfer can transfer structure

/// \return return CAN_STATUS_SUCCESS if command passed, otherwise 

///         return CAN_STATUS_LOCKED

//------------------------------------------------------------------------------

unsigned char CAN_Read( CanTransfer *pTransfer )

{

    AT91PS_CAN base_can;

    if (pTransfer->state != CAN_IDLE)  {

        return CAN_STATUS_LOCKED;

    }

    trace_LOG( trace_DEBUG, "CAN_Read\n\r");

    pTransfer->state = CAN_RECEIVING;

    if( pTransfer->can_number == 0 ) {

        base_can = AT91C_BASE_CAN0;

    }

#ifdef AT91C_BASE_CAN1

    else {

        base_can = AT91C_BASE_CAN1;

    }

#endif

    // enable interrupt

    base_can->CAN_IER = pTransfer->mailbox_in_use;

    return CAN_STATUS_SUCCESS;

}

//------------------------------------------------------------------------------

/// Test if CAN is in IDLE state

/// \param pTransfer can transfer structure

/// \return return 0 if CAN is in IDLE, otherwise return 1

//------------------------------------------------------------------------------

unsigned char CAN_IsInIdle( CanTransfer *pTransfer )

{

  return( pTransfer->state != CAN_IDLE );

}

//------------------------------------------------------------------------------

/// Basic CAN test without Interrupt

//------------------------------------------------------------------------------

void CAN_BasicTestSuiteWithoutInterrupt(void)

{

#if defined AT91C_BASE_CAN1

    unsigned int status;

    unsigned int tick=0;

    trace_LOG( trace_INFO, "Without Interrupt ");

    trace_LOG( trace_INFO, "CAN0 Mailbox 0 transmitting to CAN1 Mailbox 0\n\r");

    // Init CAN0 Mailbox 0, transmit

    CAN_ResetTransfer( pCAN0Transfer );

    pCAN0Transfer->can_number = 0;

    pCAN0Transfer->mailbox_number = 0;

    pCAN0Transfer->mode_reg = AT91C_CAN_MOT_TX | AT91C_CAN_PRIOR;

    pCAN0Transfer->acceptance_mask_reg = 0x00000000;

    pCAN0Transfer->identifier = AT91C_CAN_MIDvA & (0x07<<18);

    pCAN0Transfer->data_low_reg = 0x11223344;

    pCAN0Transfer->data_high_reg = 0x01234567;

    pCAN0Transfer->control_reg = (AT91C_CAN_MDLC & (0x8<<16));

    CAN_InitMailboxRegisters( pCAN0Transfer );

    // Init CAN1 Mailbox 0, receive, 

    CAN_ResetTransfer( pCAN1Transfer );

    pCAN1Transfer->can_number = 1;

    pCAN1Transfer->mailbox_number = 0;

    pCAN1Transfer->mode_reg = AT91C_CAN_MOT_RX;

    pCAN1Transfer->acceptance_mask_reg = AT91C_CAN_MIDvA | AT91C_CAN_MIDvB;

    pCAN1Transfer->identifier = AT91C_CAN_MIDvA & (0x07<<18);

    pCAN1Transfer->data_low_reg = 0x00000000;

    pCAN1Transfer->data_high_reg = 0x00000000;

    pCAN1Transfer->control_reg = 0x00000000;

    CAN_InitMailboxRegisters( pCAN1Transfer );

    // Transfer Request for Mailbox 0

    AT91C_BASE_CAN0->CAN_TCR = AT91C_CAN_MB0;

    tick = 0;

    do {

        // CAN Message Status Register

        status = AT91C_BASE_CAN0_MB0->CAN_MB_MSR;

    }

    while( !(status & AT91C_CAN_MRDY) && (++tick < AT91C_CAN_TIMEOUT) );

    if (tick == AT91C_CAN_TIMEOUT) {

        trace_LOG( trace_ERROR, "-E- Test FAILED\n\r");

    }

    else {

        trace_LOG( trace_DEBUG, "-I- Transfer completed: CAN1 Mailbox 0 MRDY flag has raised\n\r");

        if( AT91C_BASE_CAN0_MB0->CAN_MB_MDL != AT91C_BASE_CAN1_MB0->CAN_MB_MDL ) {

            trace_LOG( trace_ERROR, "-E- Data Corrupted\n\r");

        }

        else if( AT91C_BASE_CAN0_MB0->CAN_MB_MDH != AT91C_BASE_CAN1_MB0->CAN_MB_MDH ) {

            trace_LOG( trace_ERROR, "-E- Data Corrupted\n\r");

        }

        else {

            trace_LOG( trace_INFO, "Test passed\n\r");

        }

    }

    CAN_ResetAllMailbox();

    trace_LOG( trace_INFO, "Without Interrupt ");

    trace_LOG( trace_INFO, "CAN0 Mailboxes 1 & 2 transmitting to CAN1 Mailbox 15\n\r");

    // Init CAN0 Mailbox 1, transmit

    CAN_ResetTransfer( pCAN0Transfer );

    pCAN0Transfer->can_number = 0;

    pCAN0Transfer->mailbox_number = 1;

    pCAN0Transfer->mode_reg = AT91C_CAN_MOT_TX | AT91C_CAN_PRIOR;

    pCAN0Transfer->acceptance_mask_reg = 0x00000000;

    pCAN0Transfer->identifier = AT91C_CAN_MIDvA & (0x09<<18);      // ID 9

    pCAN0Transfer->data_low_reg = 0xAABBCCDD;

    pCAN0Transfer->data_high_reg = 0xCAFEDECA;

    pCAN0Transfer->control_reg = (AT91C_CAN_MDLC & (0x8<<16)); // Mailbox Data Length Code

    CAN_InitMailboxRegisters( pCAN0Transfer );

    // Init CAN0 Mailbox 2, transmit

    pCAN0Transfer->can_number = 0;

    pCAN0Transfer->mailbox_number = 2;

    pCAN0Transfer->mode_reg = AT91C_CAN_MOT_TX | (AT91C_CAN_PRIOR-(1<<16));

    pCAN0Transfer->acceptance_mask_reg = 0x00000000;

    pCAN0Transfer->identifier = AT91C_CAN_MIDvA & (0x0A<<18);      // ID 10

    pCAN0Transfer->data_low_reg = 0x55667788;

    pCAN0Transfer->data_high_reg = 0x99AABBCC;

    pCAN0Transfer->control_reg = (AT91C_CAN_MDLC & (0x8<<16)); // Mailbox Data Length Code

    CAN_InitMailboxRegisters( pCAN0Transfer );

    // Init CAN1 Mailbox 15, reception with overwrite

    CAN_ResetTransfer( pCAN1Transfer );

    pCAN1Transfer->can_number = 1;

    pCAN1Transfer->mailbox_number = 15;

    pCAN1Transfer->mode_reg = AT91C_CAN_MOT_RXOVERWRITE;

    pCAN1Transfer->acceptance_mask_reg = 0;

    pCAN1Transfer->identifier = 0x0;

    pCAN1Transfer->data_low_reg = 0x00000000;