rt-thread/bsp/n32g452xx/Libraries/rt_drivers/drv_can.c

/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2022-01-09     chenbin      the first version
 */

#include "drv_can.h"
#ifdef BSP_USING_CAN

#include "stdint.h"
#include "n32g45x.h"
#include "n32g45x_can.h"

//#define DRV_DEBUG
#define DBG_TAG "drv_can"
#include <drv_log.h>

struct n32g45x_baud_rate_info
{
    uint32_t baud_rate;
    uint16_t prescaler;
    uint8_t  tsjw;        //CAN synchronisation jump width.
    uint8_t  tbs1;       //CAN time quantum in bit segment 1.
    uint8_t  tbs2;       //CAN time quantum in bit segment 2.
    uint8_t  notused;
};

#define N32_CAN_BAUD_DEF(xrate, xsjw, xbs1, xbs2, xprescale) \
{                                 \
    .baud_rate = xrate,           \
    .tsjw = xsjw,                 \
    .tbs1 = xbs1,                 \
    .tbs2 = xbs2,                 \
    .prescaler = xprescale        \
}

/* N32G45x can device */
struct n32g45x_can
{
    char *name;
    CAN_Module *           can_base;
    CAN_InitType           can_init;
    CAN_FilterInitType     can_filter_init;
    struct rt_can_device   device;     /* inherit from can device */
};

/*
* N32G45x CAN1 CAN2 used APB1 (PCLK1 36MHz)
* baud calculation example:
* baud =  PCLK1 / ((sjw + tbs1 + tbs2) * brp)
* 1MHz = 36MHz / ((1 + 15 + 2) * 2)
*
* sample calculation example:
* sample = ( sjw + tbs1) / (sjw + tbs1 + tbs2)
* sample = 87.5%  at baud <= 500K
* sample = 80%    at baud > 500K
* sample = 75%    at baud > 800K
*/
#if defined (N32G45X)/* APB1 36MHz(max) */
static const struct n32g45x_baud_rate_info can_baud_rate_tab[] =
{
    N32_CAN_BAUD_DEF(CAN1MBaud,   CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 2),
    N32_CAN_BAUD_DEF(CAN800kBaud, CAN_RSJW_1tq, CAN_TBS1_12tq, CAN_TBS2_2tq, 3),
    N32_CAN_BAUD_DEF(CAN500kBaud, CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 4),
    N32_CAN_BAUD_DEF(CAN250kBaud, CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 8),
    N32_CAN_BAUD_DEF(CAN125kBaud, CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 16),
    N32_CAN_BAUD_DEF(CAN100kBaud, CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 20),
    N32_CAN_BAUD_DEF(CAN50kBaud,  CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 40),
    N32_CAN_BAUD_DEF(CAN20kBaud,  CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 100),
    N32_CAN_BAUD_DEF(CAN10kBaud,  CAN_RSJW_1tq, CAN_TBS1_15tq, CAN_TBS2_2tq, 200),
};
#endif

#ifdef BSP_USING_CAN1
static struct n32g45x_can drv_can1 =
{
    .name = "can1",
    .can_base = CAN1,
};
#endif

#ifdef BSP_USING_CAN2
static struct n32g45x_can drv_can2 =
{
    .name = "can2",
    .can_base = CAN2,
};
#endif

static uint32_t get_can_baud_index(rt_uint32_t baud)
{
    uint32_t len, index;

    len = sizeof(can_baud_rate_tab) / sizeof(can_baud_rate_tab[0]);
    for (index = 0; index < len; index++)
    {
        if (can_baud_rate_tab[index].baud_rate == baud)
            return index;
    }
    return 0; /* default baud is CAN1MBaud */
}

static uint8_t get_can_mode_rtt2n32(uint8_t rtt_can_mode)
{
    uint8_t mode = CAN_Normal_Mode;
    switch (rtt_can_mode)
    {
    case RT_CAN_MODE_NORMAL:
            mode = CAN_Normal_Mode;
            break;
#if RT_CAN_MODE_LISEN
    case RT_CAN_MODE_LISEN:
#endif
#if RT_CAN_MODE_LISTEN
    case RT_CAN_MODE_LISTEN:
#endif
            mode = CAN_Silent_Mode;
            break;
    case RT_CAN_MODE_LOOPBACK:
            mode = CAN_LoopBack_Mode;
            break;
#if RT_CAN_MODE_LOOPBACKANLISEN
    case RT_CAN_MODE_LOOPBACKANLISEN:
#endif
#if RT_CAN_MODE_LOOPBACKANLISTEN
    case RT_CAN_MODE_LOOPBACKANLISTEN:
#endif
            mode = CAN_Silent_LoopBack_Mode;
            break;
    }
    return mode;
}

static rt_err_t _can_filter_config(struct n32g45x_can *drv_can)
{
    if(drv_can->can_base == CAN1)
    {
        CAN1_InitFilter(&(drv_can->can_filter_init));
    }
    else
    if(drv_can->can_base == CAN2)
    {
        CAN2_InitFilter(&(drv_can->can_filter_init));
    }
    else
    {
        LOG_E("can filter config error");
        return -RT_EINVAL;
    }
    return RT_EOK;
}

static rt_err_t _can_config(struct rt_can_device *can, struct can_configure *cfg)
{
    struct n32g45x_can *drv_can;
    rt_uint32_t baud_index;

    RT_ASSERT(can);
    RT_ASSERT(cfg);
    drv_can = (struct n32g45x_can *)can->parent.user_data;
    RT_ASSERT(drv_can);

    /* CAN1 and CAN2 register init */
    //CAN_DeInit(drv_can->can_base);

    /* Configure CAN1 and CAN2 */
    if(drv_can->can_base == CAN1)
    {
        n32_msp_can_init(CAN1);
    }
    else
    if(drv_can->can_base == CAN2)
    {
        n32_msp_can_init(CAN2);
    }
    else
    {
        LOG_E("can gpio init error");
        return -RT_EINVAL;
    }
    /* Struct init*/
    CAN_InitStruct(&(drv_can->can_init));

    drv_can->can_init.TTCM          = DISABLE;
    drv_can->can_init.ABOM          = DISABLE;
    drv_can->can_init.AWKUM         = DISABLE;
    drv_can->can_init.NART          = DISABLE;
    drv_can->can_init.RFLM          = DISABLE;
    drv_can->can_init.TXFP          = ENABLE;

    //mode
    drv_can->can_init.OperatingMode = get_can_mode_rtt2n32(cfg->mode);

    //baud
    baud_index = get_can_baud_index(cfg->baud_rate);
    drv_can->can_init.RSJW    = can_baud_rate_tab[baud_index].tsjw;
    drv_can->can_init.TBS1    = can_baud_rate_tab[baud_index].tbs1;
    drv_can->can_init.TBS2    = can_baud_rate_tab[baud_index].tbs2;
    drv_can->can_init.BaudRatePrescaler  = can_baud_rate_tab[baud_index].prescaler;

    /* init can */
    if( CAN_Init(drv_can->can_base, &(drv_can->can_init) ) != CAN_InitSTS_Success )
    {
        LOG_E("can init error");
        return -RT_ERROR;
    }
    int smaple = (can_baud_rate_tab[baud_index].tsjw + can_baud_rate_tab[baud_index].tbs1)*100 * 100 / (can_baud_rate_tab[baud_index].tsjw + can_baud_rate_tab[baud_index].tbs1 + can_baud_rate_tab[baud_index].tbs2);

    LOG_D("can[%08X] init baud:%d sjw:%d tbs1:%d tbs2:%d prescaler:%d sample:%d.%d",
            drv_can->can_base,  cfg->baud_rate,
            can_baud_rate_tab[baud_index].tsjw,  can_baud_rate_tab[baud_index].tbs1, can_baud_rate_tab[baud_index].tbs2,
            can_baud_rate_tab[baud_index].prescaler , smaple/100, smaple%100);
    /* default filter config */
    _can_filter_config(drv_can);
    return RT_EOK;
}

static rt_err_t _can_control(struct rt_can_device *can, int cmd, void *arg)
{
    rt_uint32_t argval;
    struct n32g45x_can *drv_can;
    struct rt_can_filter_config *filter_cfg;

    RT_ASSERT(can != RT_NULL);
    drv_can = (struct n32g45x_can *)can->parent.user_data;
    RT_ASSERT(drv_can != RT_NULL);

    switch (cmd)
    {
    case RT_DEVICE_CTRL_CLR_INT:
        argval = (rt_uint32_t) arg;
        if (argval == RT_DEVICE_FLAG_INT_RX)
        {
            if (CAN1 == drv_can->can_base)
            {
                NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
                NVIC_DisableIRQ(CAN1_RX1_IRQn);
            }
            if (CAN2 == drv_can->can_base)
            {
                NVIC_DisableIRQ(CAN2_RX0_IRQn);
                NVIC_DisableIRQ(CAN2_RX1_IRQn);
            }
            CAN_INTConfig(drv_can->can_base, CAN_INT_FMP0, DISABLE);   /*!< DATFIFO 0 message pending Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FF0, DISABLE);   /*!< DATFIFO 0 full Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FOV0, DISABLE);  /*!< DATFIFO 0 overrun Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FMP1, DISABLE);  /*!< DATFIFO 1 message pending Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FF1, DISABLE);  /*!< DATFIFO 1 full Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FOV1, DISABLE);  /*!< DATFIFO 1 overrun Interrupt*/
        }
        else if (argval == RT_DEVICE_FLAG_INT_TX)
        {
            if (CAN1 == drv_can->can_base)
            {
                NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
            }
            if (CAN2 == drv_can->can_base)
            {
                NVIC_DisableIRQ(CAN2_TX_IRQn);
            }
            CAN_INTConfig(drv_can->can_base, CAN_INT_TME, DISABLE);  /*!< Transmit mailbox empty Interrupt*/
        }
        else if (argval == RT_DEVICE_CAN_INT_ERR)
        {
            if (CAN1 == drv_can->can_base)
            {
                NVIC_DisableIRQ(CAN1_SCE_IRQn);
            }
            if (CAN2 == drv_can->can_base)
            {
                NVIC_DisableIRQ(CAN2_SCE_IRQn);
            }
            CAN_INTConfig(drv_can->can_base, CAN_INT_EWG, DISABLE); /*!< Error warning Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_EPV, DISABLE); /*!< Error passive Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_BOF, DISABLE); /*!< Bus-off Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_LEC, DISABLE); /*!< Last error code Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_ERR, DISABLE); /*!< Error Interrupt*/
        }
        break;
    case RT_DEVICE_CTRL_SET_INT:
        argval = (rt_uint32_t) arg;
        if (argval == RT_DEVICE_FLAG_INT_RX)
        {
            CAN_INTConfig(drv_can->can_base, CAN_INT_FMP0, ENABLE);   /*!< DATFIFO 0 message pending Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FF0,  ENABLE);   /*!< DATFIFO 0 full Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FOV0, ENABLE);  /*!< DATFIFO 0 overrun Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FMP1, ENABLE);  /*!< DATFIFO 1 message pending Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FF1,  ENABLE);  /*!< DATFIFO 1 full Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_FOV1, ENABLE);  /*!< DATFIFO 1 overrun Interrupt*/

            if (CAN1 == drv_can->can_base)
            {
                NVIC_SetPriority(USB_LP_CAN1_RX0_IRQn, 1);
                NVIC_EnableIRQ(USB_LP_CAN1_RX0_IRQn);
                NVIC_SetPriority(CAN1_RX1_IRQn, 1);
                NVIC_EnableIRQ(CAN1_RX1_IRQn);
            }
            if (CAN2 == drv_can->can_base)
            {
                NVIC_SetPriority(CAN2_RX0_IRQn, 1);
                NVIC_EnableIRQ(CAN2_RX0_IRQn);
                NVIC_SetPriority(CAN2_RX1_IRQn, 1);
                NVIC_EnableIRQ(CAN2_RX1_IRQn);
            }
        }
        else if (argval == RT_DEVICE_FLAG_INT_TX)
        {
            CAN_INTConfig(drv_can->can_base, CAN_INT_TME, ENABLE);  /*!< Transmit mailbox empty Interrupt*/

            if (CAN1 == drv_can->can_base)
            {
                NVIC_SetPriority(USB_HP_CAN1_TX_IRQn, 1);
                NVIC_EnableIRQ(USB_HP_CAN1_TX_IRQn);
            }
            if (CAN2 == drv_can->can_base)
            {
                NVIC_SetPriority(CAN2_TX_IRQn, 1);
                NVIC_EnableIRQ(CAN2_TX_IRQn);
            }
        }
        else if (argval == RT_DEVICE_CAN_INT_ERR)
        {
            CAN_INTConfig(drv_can->can_base, CAN_INT_EWG, ENABLE); /*!< Error warning Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_EPV, ENABLE); /*!< Error passive Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_BOF, ENABLE); /*!< Bus-off Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_LEC, ENABLE); /*!< Last error code Interrupt*/
            CAN_INTConfig(drv_can->can_base, CAN_INT_ERR, ENABLE); /*!< Error Interrupt*/

            if (CAN1 == drv_can->can_base)
            {
                NVIC_SetPriority(CAN1_SCE_IRQn, 1);
                NVIC_EnableIRQ(CAN1_SCE_IRQn);
            }
            if (CAN2 == drv_can->can_base)
            {
                NVIC_SetPriority(CAN2_SCE_IRQn, 1);
                NVIC_EnableIRQ(CAN2_SCE_IRQn);
            }
        }
        break;
    case RT_CAN_CMD_SET_FILTER:
    {
        rt_uint32_t id_h = 0;
        rt_uint32_t id_l = 0;
        rt_uint32_t mask_h = 0;
        rt_uint32_t mask_l = 0;
        rt_uint32_t mask_l_tail = 0;  //CAN_FxR2 bit [2:0]

        if (RT_NULL == arg)
        {
            /* default filter config */
            _can_filter_config(drv_can);
        }
        else
        {
            filter_cfg = (struct rt_can_filter_config *)arg;
            /* get default filter */
            for (int i = 0; i < filter_cfg->count; i++)
            {
                if (filter_cfg->items[i].hdr_bank == -1)
                {
                    drv_can->can_filter_init.Filter_Num = i;
                }
                else
                {
                    drv_can->can_filter_init.Filter_Num = filter_cfg->items[i].hdr_bank;
                }

                if (filter_cfg->items[i].mode == 0x00)
                {
                    drv_can->can_filter_init.Filter_Mode  = CAN_Filter_IdMaskMode;
                }
                else if (filter_cfg->items[i].mode == 0x01)
                {
                    drv_can->can_filter_init.Filter_Mode  = CAN_Filter_IdListMode;
                }

                if (filter_cfg->items[i].ide == RT_CAN_STDID)
                {
                    id_h = ((filter_cfg->items[i].id << 18) >> 13) & 0xFFFF;
                    id_l = ((filter_cfg->items[i].id << 18) |
                            (filter_cfg->items[i].ide << 2) |
                            (filter_cfg->items[i].rtr << 1)) & 0xFFFF;
                    mask_h = ((filter_cfg->items[i].mask << 21) >> 16) & 0xFFFF;
                    mask_l = ((filter_cfg->items[i].mask << 21) | mask_l_tail) & 0xFFFF;
                }
                else if (filter_cfg->items[i].ide == RT_CAN_EXTID)
                {
                    id_h = (filter_cfg->items[i].id >> 13) & 0xFFFF;
                    id_l = ((filter_cfg->items[i].id << 3)   |
                            (filter_cfg->items[i].ide << 2)  |
                            (filter_cfg->items[i].rtr << 1)) & 0xFFFF;
                    mask_h = ((filter_cfg->items[i].mask << 3) >> 16) & 0xFFFF;
                    mask_l = ((filter_cfg->items[i].mask << 3) | mask_l_tail) & 0xFFFF;
                }
                drv_can->can_filter_init.Filter_Scale        = CAN_Filter_32bitScale;
                drv_can->can_filter_init.Filter_HighId       = id_h;
                drv_can->can_filter_init.Filter_LowId        = id_l;
                drv_can->can_filter_init.FilterMask_HighId   = mask_h;
                drv_can->can_filter_init.FilterMask_LowId    = mask_l;
                drv_can->can_filter_init.Filter_FIFOAssignment = CAN_FIFO0;
                drv_can->can_filter_init.Filter_Act            = ENABLE;

                /* Filter conf */
                _can_filter_config(drv_can);
            }
        }
        break;
    }
    case RT_CAN_CMD_SET_MODE:
        argval = (rt_uint32_t) arg;
        if (argval != RT_CAN_MODE_NORMAL &&
                argval != RT_CAN_MODE_LISEN &&
                argval != RT_CAN_MODE_LOOPBACK &&
                argval != RT_CAN_MODE_LOOPBACKANLISEN)
        {
            return -RT_ERROR;
        }
        if (argval != drv_can->device.config.mode)
        {
            drv_can->device.config.mode = argval;
            return _can_config(&drv_can->device, &drv_can->device.config);
        }
        break;
    case RT_CAN_CMD_SET_BAUD:
        argval = (rt_uint32_t) arg;
        if (argval != CAN1MBaud &&
                argval != CAN800kBaud &&
                argval != CAN500kBaud &&
                argval != CAN250kBaud &&
                argval != CAN125kBaud &&
                argval != CAN100kBaud &&
                argval != CAN50kBaud  &&
                argval != CAN20kBaud  &&
                argval != CAN10kBaud)
        {
            return -RT_ERROR;
        }
        if (argval != drv_can->device.config.baud_rate)
        {
            drv_can->device.config.baud_rate = argval;
            return _can_config(&drv_can->device, &drv_can->device.config);
        }
        break;
    case RT_CAN_CMD_SET_PRIV:
        argval = (rt_uint32_t) arg;
        if (argval != RT_CAN_MODE_PRIV &&
                argval != RT_CAN_MODE_NOPRIV)
        {
            return -RT_ERROR;
        }
        if (argval != drv_can->device.config.privmode)
        {
            drv_can->device.config.privmode = argval;
            return _can_config(&drv_can->device, &drv_can->device.config);
        }
        break;
        case RT_CAN_CMD_GET_STATUS:
        {
            rt_uint32_t errval;
            errval = drv_can->can_base->ESTS;
            drv_can->device.status.rcverrcnt = errval >> 24;           //REC
            drv_can->device.status.snderrcnt = (errval >> 16 & 0xFF);  //TEC
            drv_can->device.status.lasterrtype = errval & 0x70;        //LEC
            drv_can->device.status.errcode = errval & 0x07;

            rt_memcpy(arg, &drv_can->device.status, sizeof(drv_can->device.status));
        }
        break;
    }

    return RT_EOK;
}

/* CAN Mailbox Transmit Request */
#define TMIDxR_TXRQ ((uint32_t)0x00000001) /* Transmit mailbox request */

static int _can_sendmsg_rtmsg(CAN_Module* can_base, struct rt_can_msg *pmsg, uint32_t mailbox_index)
{
    CanTxMessage CAN_TxMessage = {0};
    CanTxMessage* TxMessage = &CAN_TxMessage;
    /* Check the parameters */
    assert_param(IS_CAN_ALL_PERIPH(can_base));

    if (RT_CAN_STDID == pmsg->ide)
    {
            TxMessage->IDE = CAN_Standard_Id;
            RT_ASSERT(IS_CAN_STDID(pmsg->id));
            TxMessage->StdId = pmsg->id;
    }
    else
    {
            TxMessage->IDE = CAN_Extended_Id;
            RT_ASSERT(IS_CAN_EXTID(pmsg->id));
            TxMessage->ExtId = pmsg->id;
    }

    if (RT_CAN_DTR == pmsg->rtr)
    {
            TxMessage->RTR = CAN_RTRQ_DATA;
    }
    else
    {
            TxMessage->RTR = CAN_RTRQ_REMOTE;
    }

    if (mailbox_index != CAN_TxSTS_NoMailBox)
    {
        /* Set up the Id */
        can_base->sTxMailBox[mailbox_index].TMI &= TMIDxR_TXRQ;
        if (TxMessage->IDE == CAN_Standard_Id)
        {
                assert_param(IS_CAN_STDID(TxMessage->StdId));
                can_base->sTxMailBox[mailbox_index].TMI |= ((TxMessage->StdId << 21) | TxMessage->RTR);
        }
        else
        {
                assert_param(IS_CAN_EXTID(TxMessage->ExtId));
                can_base->sTxMailBox[mailbox_index].TMI |= ((TxMessage->ExtId << 3) | TxMessage->IDE | TxMessage->RTR);
        }

        /* Set up the DLC */
        TxMessage->DLC = pmsg->len & 0x0FU;
        can_base->sTxMailBox[mailbox_index].TMDT &= (uint32_t)0xFFFFFFF0;
        can_base->sTxMailBox[mailbox_index].TMDT |= TxMessage->DLC;

        /* Set up the data field */
        can_base->sTxMailBox[mailbox_index].TMDH =
                (((uint32_t)pmsg->data[7] << 24) |
            ((uint32_t)pmsg->data[6] << 16)  |
            ((uint32_t)pmsg->data[5] << 8) |
            ((uint32_t)pmsg->data[4]) );
        can_base->sTxMailBox[mailbox_index].TMDL =
                (((uint32_t)pmsg->data[3] << 24) |
            ((uint32_t)pmsg->data[2] << 16) |
            ((uint32_t)pmsg->data[1] << 8) |
            ((uint32_t)pmsg->data[0]) );
        /* Request transmission */
        can_base->sTxMailBox[mailbox_index].TMI |= TMIDxR_TXRQ;

        return RT_EOK;
    }
    return -RT_ERROR;
}


static int _can_sendmsg(struct rt_can_device *can, const void *buf, rt_uint32_t box_num)
{
    struct n32g45x_can *drv_can;

    RT_ASSERT(can != RT_NULL);
    RT_ASSERT(buf != RT_NULL);
    drv_can = (struct n32g45x_can *)can->parent.user_data;
    RT_ASSERT(drv_can != RT_NULL);

    /* Select one empty transmit mailbox */
    switch(box_num)
    {
        case 0:
            if ((drv_can->can_base->TSTS & CAN_TSTS_TMEM0) != CAN_TSTS_TMEM0)
            {
                    /* Return function status */
                    return -RT_ERROR;
            }
        break;
        case 1:
            if ((drv_can->can_base->TSTS & CAN_TSTS_TMEM1) != CAN_TSTS_TMEM1)
            {
                    /* Return function status */
                    return -RT_ERROR;
            }
        break;
        case 2:
            if ((drv_can->can_base->TSTS & CAN_TSTS_TMEM2) != CAN_TSTS_TMEM2)
            {
                    /* Return function status */
                    return -RT_ERROR;
            }
        break;
        default:
    RT_ASSERT(0);
        break;
    }
    //start send msg
    return _can_sendmsg_rtmsg(drv_can->can_base , ((struct rt_can_msg *) buf) ,box_num);
}



static int _can_recvmsg_rtmsg(CAN_Module* can_base, struct rt_can_msg *pmsg, uint32_t FIFONum)
{
    CanRxMessage CAN_RxMessage = {0};
    CanRxMessage* RxMessage = &CAN_RxMessage;
    /* Check the parameters */
    assert_param(IS_CAN_ALL_PERIPH(can_base));
    assert_param(IS_CAN_FIFO(FIFONum));

    /* Check the Rx FIFO */
    if (FIFONum == CAN_FIFO0) /* Rx element is assigned to Rx FIFO 0 */
    {
      /* Check that the Rx FIFO 0 is not empty */
      if ((can_base->RFF0 & CAN_RFF0_FFMP0) == 0U)
      {
                return -RT_ERROR;
      }
    }
    else /* Rx element is assigned to Rx FIFO 1 */
    {
      /* Check that the Rx FIFO 1 is not empty */
      if ((can_base->RFF1 & CAN_RFF1_FFMP1) == 0U)
      {
                return -RT_ERROR;
      }
    }

    /* Get the Id */
    RxMessage->IDE = (uint8_t)0x04 & can_base->sFIFOMailBox[FIFONum].RMI;
    if (RxMessage->IDE == CAN_Standard_Id)
    {
        RxMessage->StdId = (uint32_t)0x000007FF & (can_base->sFIFOMailBox[FIFONum].RMI >> 21);
    }
    else
    {
        RxMessage->ExtId = (uint32_t)0x1FFFFFFF & (can_base->sFIFOMailBox[FIFONum].RMI >> 3);
    }
    RxMessage->RTR = (uint8_t)0x02 & can_base->sFIFOMailBox[FIFONum].RMI;
    /* Get the DLC */
    RxMessage->DLC = (uint8_t)0x0F & can_base->sFIFOMailBox[FIFONum].RMDT;
    /* Get the FMI */
    RxMessage->FMI = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDT >> 8);

    /* Get the data field */
    pmsg->data[0] = (uint8_t)0xFF & can_base->sFIFOMailBox[FIFONum].RMDL;
    pmsg->data[1] = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDL >> 8);
    pmsg->data[2] = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDL >> 16);
    pmsg->data[3] = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDL >> 24);
    pmsg->data[4] = (uint8_t)0xFF & can_base->sFIFOMailBox[FIFONum].RMDH;
    pmsg->data[5] = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDH >> 8);
    pmsg->data[6] = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDH >> 16);
    pmsg->data[7] = (uint8_t)0xFF & (can_base->sFIFOMailBox[FIFONum].RMDH >> 24);

        /* get len */
        pmsg->len = RxMessage->DLC;

        /* get id */
    if (RxMessage->IDE == CAN_Standard_Id)
    {
        pmsg->ide = RT_CAN_STDID;
        pmsg->id = RxMessage->StdId;
    }
    else
    {
        pmsg->ide = RT_CAN_EXTID;
        pmsg->id = RxMessage->ExtId;
    }
    /* get type */
    if (CAN_RTRQ_Data == RxMessage->RTR)
    {
        pmsg->rtr = RT_CAN_DTR;
    }
    else
    {
        pmsg->rtr = RT_CAN_RTR;
    }

    /* get hdr_index */
    if (can_base == CAN1)
    {
        pmsg->hdr_index = (RxMessage->FMI + 1) >> 1;
    }
    else if (can_base == CAN2)
    {
       pmsg->hdr_index = (RxMessage->FMI >> 1) + 14;
    }
    /* Release the DATFIFO */
    /* Release FIFO0 */
    if (FIFONum == CAN_FIFO0)
    {
        can_base->RFF0 |= CAN_RFF0_RFFOM0;
    }
    /* Release FIFO1 */
    else /* FIFONum == CAN_FIFO1 */
    {
        can_base->RFF1 |= CAN_RFF1_RFFOM1;
    }
    return RT_EOK;
}


static int _can_recvmsg(struct rt_can_device *can, void *buf, rt_uint32_t fifo)
{
    struct n32g45x_can *drv_can;

    RT_ASSERT(can != RT_NULL);
    RT_ASSERT(buf != RT_NULL);
    drv_can = (struct n32g45x_can *)can->parent.user_data;
    RT_ASSERT(drv_can != RT_NULL);

    /* get data */
        return _can_recvmsg_rtmsg(drv_can->can_base,((struct rt_can_msg *) buf),fifo);
}

static const struct rt_can_ops _can_ops =
{
    _can_config,
    _can_control,
    _can_sendmsg,
    _can_recvmsg,
};

static void _can_rx_isr(struct rt_can_device *can, rt_uint32_t fifo)
{
    struct n32g45x_can *drv_can;
    RT_ASSERT(can != RT_NULL);
    drv_can = (struct n32g45x_can *)can->parent.user_data;
    RT_ASSERT(drv_can != RT_NULL);
    CAN_Module * can_base = drv_can->can_base;
    switch (fifo)
    {
    case CAN_FIFO0:
        if( (can_base->RFF0 & CAN_RFF0_FFMP0) && ((can_base->INTE & CAN_INTE_FMPITE0) ==CAN_INTE_FMPITE0) )
        {
            rt_hw_can_isr(can, RT_CAN_EVENT_RX_IND | fifo << 8);
        }
        if( (can_base->RFF0 & CAN_RFF0_FFULL0) && ((can_base->INTE & CAN_INTE_FFITE0) ==CAN_INTE_FFITE0) )
        {
            can_base->RFF0 |= CAN_RFF0_FFULL0;  //clear
        }
        if( (can_base->RFF0 & CAN_RFF0_FFOVR0) && ((can_base->INTE & CAN_INTE_FOVITE0) ==CAN_INTE_FOVITE0) )
        {
            can_base->RFF0 |= CAN_RFF0_FFOVR0;  //clear
            rt_hw_can_isr(can, RT_CAN_EVENT_RXOF_IND | fifo << 8);
        }
        break;
    case CAN_FIFO1:
        if( (can_base->RFF1 & CAN_RFF1_FFMP1) && ((can_base->INTE & CAN_INTE_FMPITE1) ==CAN_INTE_FMPITE1) )
        {
            rt_hw_can_isr(can, RT_CAN_EVENT_RX_IND | fifo << 8);
        }
        if( (can_base->RFF1 & CAN_RFF1_FFULL1) && ((can_base->INTE & CAN_INTE_FFITE1) ==CAN_INTE_FFITE1) )
        {
            can_base->RFF1 |= CAN_RFF1_FFULL1;  //clear
        }
        if( (can_base->RFF1 & CAN_RFF1_FFOVR1) && ((can_base->INTE & CAN_INTE_FOVITE1) ==CAN_INTE_FOVITE1) )
        {
            can_base->RFF1 |= CAN_RFF1_FFOVR1;  //clear
            rt_hw_can_isr(can, RT_CAN_EVENT_RXOF_IND | fifo << 8);
        }
        break;
    }
}

#ifdef BSP_USING_CAN1
/**
 * @brief This function handles CAN1 TX interrupts. transmit fifo0/1/2 is empty can trigger this interrupt
 */
void USB_HP_CAN1_TX_IRQHandler(void)
{
    rt_interrupt_enter();
    struct n32g45x_can *drv_can = &drv_can1;
    CAN_Module * can_base = drv_can->can_base;

    if((can_base->INTE & CAN_INTE_TMEITE) == CAN_INTE_TMEITE)
    {
        if( (can_base->TSTS & CAN_TSTS_RQCPM0) == CAN_TSTS_RQCPM0)
        {
            //Request Completed Mailbox0
            if( ( can_base->TSTS & CAN_TSTS_TXOKM0) == CAN_TSTS_TXOKM0)
            {
                can_base->TSTS |= CAN_TSTS_TXOKM0; // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_DONE | (0x00 << 8));
            }
            if( ( ( can_base->TSTS & CAN_TSTS_ALSTM0) == CAN_TSTS_ALSTM0)
                || (( can_base->TSTS & CAN_TSTS_TERRM0) == CAN_TSTS_TERRM0) )
            {
                can_base->TSTS |= (CAN_TSTS_ALSTM0 | CAN_TSTS_TERRM0); // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | (0x00 << 8));
            }
            can_base->TSTS |= CAN_TSTS_RQCPM0; // set 1 clear
        }
        if( (can_base->TSTS & CAN_TSTS_RQCPM1) == CAN_TSTS_RQCPM1)
        {
            //Request Completed Mailbox0
            if( ( can_base->TSTS & CAN_TSTS_TXOKM1) == CAN_TSTS_TXOKM1)
            {
                can_base->TSTS |= CAN_TSTS_TXOKM1; // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_DONE | (0x01 << 8));
            }
            if( ( ( can_base->TSTS & CAN_TSTS_ALSTM1) == CAN_TSTS_ALSTM1)
                || (( can_base->TSTS & CAN_TSTS_TERRM1) == CAN_TSTS_TERRM1) )
            {
                can_base->TSTS |= (CAN_TSTS_ALSTM1 | CAN_TSTS_TERRM1); // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | (0x01 << 8));
            }
            can_base->TSTS |= CAN_TSTS_RQCPM1; // set 1 clear
        }
        if( (can_base->TSTS & CAN_TSTS_RQCPM2) == CAN_TSTS_RQCPM2)
        {
            //Request Completed Mailbox0
            if( ( can_base->TSTS & CAN_TSTS_TXOKM2) == CAN_TSTS_TXOKM2)
            {
                can_base->TSTS |= CAN_TSTS_TXOKM2; // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_DONE | (0x02 << 8));
            }
            if( ( ( can_base->TSTS & CAN_TSTS_ALSTM2) == CAN_TSTS_ALSTM2)
                || (( can_base->TSTS & CAN_TSTS_TERRM2) == CAN_TSTS_TERRM2) )
            {
                can_base->TSTS |= (CAN_TSTS_ALSTM2 | CAN_TSTS_TERRM2); // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | (0x02 << 8));
            }
            can_base->TSTS |= CAN_TSTS_RQCPM2; // set 1 clear
        }

        can_base->TSTS |= (CAN_TSTS_RQCPM0 | CAN_TSTS_RQCPM1 |CAN_TSTS_RQCPM2); // set 1 clear
    }
    rt_interrupt_leave();
}

/**
 * @brief This function handles CAN1 RX0 interrupts.
 */
void USB_LP_CAN1_RX0_IRQHandler(void)
{
    rt_interrupt_enter();
    _can_rx_isr(&drv_can1.device, CAN_FIFO0);
    rt_interrupt_leave();
}

/**
 * @brief This function handles CAN1 RX1 interrupts.
 */
void CAN1_RX1_IRQHandler(void)
{
    rt_interrupt_enter();
    _can_rx_isr(&drv_can1.device, CAN_FIFO1);
    rt_interrupt_leave();
}

/**
 * @brief This function handles CAN1 SCE interrupts.
 */
void CAN1_SCE_IRQHandler(void)
{
    rt_interrupt_enter();
    struct n32g45x_can *drv_can = &drv_can1;
    CAN_Module * can_base = drv_can->can_base;
    uint32_t errval = can_base->ESTS;

    // ESTS -> LEC
    switch ((errval & 0x70) >> 4)
    {
    case RT_CAN_BUS_BIT_PAD_ERR:
        drv_can->device.status.bitpaderrcnt++;
        break;
    case RT_CAN_BUS_FORMAT_ERR:
        drv_can->device.status.formaterrcnt++;
        break;
    case RT_CAN_BUS_ACK_ERR:/* attention !!! test ack err's unit is transmit unit */
        drv_can->device.status.ackerrcnt++;
        if( ( can_base->TSTS & CAN_TSTS_TXOKM0) == CAN_TSTS_TXOKM0)
        {
            rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | 0x00 << 8);
        }else
        if( ( can_base->TSTS & CAN_TSTS_TXOKM1) == CAN_TSTS_TXOKM1)
        {
            rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | 0x01 << 8);
        }else
        if( ( can_base->TSTS & CAN_TSTS_TXOKM2) == CAN_TSTS_TXOKM2)
        {
            rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | 0x02 << 8);
        }
        break;
    case RT_CAN_BUS_IMPLICIT_BIT_ERR:
    case RT_CAN_BUS_EXPLICIT_BIT_ERR:
        drv_can->device.status.biterrcnt++;
        break;
    case RT_CAN_BUS_CRC_ERR:
        drv_can->device.status.crcerrcnt++;
        break;
    }

    drv_can->device.status.lasterrtype = errval & 0x70;
    drv_can->device.status.rcverrcnt = errval >> 24;
    drv_can->device.status.snderrcnt = (errval >> 16 & 0xFF);
    drv_can->device.status.errcode = errval & 0x07;

    CAN_ClearINTPendingBit(can_base, CAN_INT_ERR);
    rt_interrupt_leave();
}
#endif /* BSP_USING_CAN1 */

#ifdef BSP_USING_CAN2
/**
 * @brief This function handles CAN2 TX interrupts.
 */
void CAN2_TX_IRQHandler(void)
{
    rt_interrupt_enter();
    struct n32g45x_can *drv_can = &drv_can2;
    CAN_Module * can_base = drv_can->can_base;

    if((can_base->INTE & CAN_INTE_TMEITE) == CAN_INTE_TMEITE)
    {
        if( (can_base->TSTS & CAN_TSTS_RQCPM0) == CAN_TSTS_RQCPM0)
        {
            //Request Completed Mailbox0
            if( ( can_base->TSTS & CAN_TSTS_TXOKM0) == CAN_TSTS_TXOKM0)
            {
                can_base->TSTS |= CAN_TSTS_TXOKM0; // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_DONE | (0x00 << 8));
            }
            if( ( ( can_base->TSTS & CAN_TSTS_ALSTM0) == CAN_TSTS_ALSTM0)
                || (( can_base->TSTS & CAN_TSTS_TERRM0) == CAN_TSTS_TERRM0) )
            {
                can_base->TSTS |= (CAN_TSTS_ALSTM0 | CAN_TSTS_TERRM0); // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | (0x00 << 8));
            }
            can_base->TSTS |= CAN_TSTS_RQCPM0; // set 1 clear
        }
        if( (can_base->TSTS & CAN_TSTS_RQCPM1) == CAN_TSTS_RQCPM1)
        {
            //Request Completed Mailbox1
            if( ( can_base->TSTS & CAN_TSTS_TXOKM1) == CAN_TSTS_TXOKM1)
            {
                can_base->TSTS |= CAN_TSTS_TXOKM1; // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_DONE | (0x01 << 8));
            }
            if( ( ( can_base->TSTS & CAN_TSTS_ALSTM1) == CAN_TSTS_ALSTM1)
                || (( can_base->TSTS & CAN_TSTS_TERRM1) == CAN_TSTS_TERRM1) )
            {
                can_base->TSTS |= (CAN_TSTS_ALSTM1 | CAN_TSTS_TERRM1); // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | (0x01 << 8));
            }
            can_base->TSTS |= CAN_TSTS_RQCPM1; // set 1 clear
        }
        if( (can_base->TSTS & CAN_TSTS_RQCPM2) == CAN_TSTS_RQCPM2)
        {
            //Request Completed Mailbox2
            if( ( can_base->TSTS & CAN_TSTS_TXOKM2) == CAN_TSTS_TXOKM2)
            {
                can_base->TSTS |= CAN_TSTS_TXOKM2; // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_DONE | (0x02 << 8));
            }
            if( ( ( can_base->TSTS & CAN_TSTS_ALSTM2) == CAN_TSTS_ALSTM2)
                || (( can_base->TSTS & CAN_TSTS_TERRM2) == CAN_TSTS_TERRM2) )
            {
                can_base->TSTS |= (CAN_TSTS_ALSTM2 | CAN_TSTS_TERRM2); // set 1 clear
                rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | (0x02 << 8));
            }
            can_base->TSTS |= CAN_TSTS_RQCPM2; // set 1 clear
        }

        can_base->TSTS |= (CAN_TSTS_RQCPM0 | CAN_TSTS_RQCPM1 |CAN_TSTS_RQCPM2); // set 1 clear
    }
    rt_interrupt_leave();
}

/**
 * @brief This function handles CAN2 RX0 interrupts.
 */
void CAN2_RX0_IRQHandler(void)
{
    rt_interrupt_enter();
    _can_rx_isr(&drv_can2.device, CAN_FIFO0);
    rt_interrupt_leave();
}

/**
 * @brief This function handles CAN2 RX1 interrupts.
 */
void CAN2_RX1_IRQHandler(void)
{
    rt_interrupt_enter();
    _can_rx_isr(&drv_can2.device, CAN_FIFO1);
    rt_interrupt_leave();
}

/**
 * @brief This function handles CAN2 SCE interrupts.
 */
void CAN2_SCE_IRQHandler(void)
{
    rt_interrupt_enter();
    struct n32g45x_can *drv_can = &drv_can2;
    CAN_Module * can_base = drv_can->can_base;
    uint32_t errval = can_base->ESTS;

    // ESTS -> LEC
    switch ((errval & 0x70) >> 4)
    {
    case RT_CAN_BUS_BIT_PAD_ERR:
        drv_can->device.status.bitpaderrcnt++;
        break;
    case RT_CAN_BUS_FORMAT_ERR:
        drv_can->device.status.formaterrcnt++;
        break;
    case RT_CAN_BUS_ACK_ERR:/* attention !!! test ack err's unit is transmit unit */
        drv_can->device.status.ackerrcnt++;
        if( ( can_base->TSTS & CAN_TSTS_TXOKM0) == CAN_TSTS_TXOKM0)
        {
            rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | 0x00 << 8);
        }else
        if( ( can_base->TSTS & CAN_TSTS_TXOKM1) == CAN_TSTS_TXOKM1)
        {
            rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | 0x01 << 8);
        }else
        if( ( can_base->TSTS & CAN_TSTS_TXOKM2) == CAN_TSTS_TXOKM2)
        {
            rt_hw_can_isr(&drv_can->device, RT_CAN_EVENT_TX_FAIL | 0x02 << 8);
        }
        break;
    case RT_CAN_BUS_IMPLICIT_BIT_ERR:
    case RT_CAN_BUS_EXPLICIT_BIT_ERR:
        drv_can->device.status.biterrcnt++;
        break;
    case RT_CAN_BUS_CRC_ERR:
        drv_can->device.status.crcerrcnt++;
        break;
    }

    drv_can->device.status.lasterrtype = errval & 0x70;
    drv_can->device.status.rcverrcnt = errval >> 24;
    drv_can->device.status.snderrcnt = (errval >> 16 & 0xFF);
    drv_can->device.status.errcode = errval & 0x07;

    CAN_ClearINTPendingBit(can_base, CAN_INT_ERR);
    rt_interrupt_leave();
}
#endif /* BSP_USING_CAN2 */


int rt_hw_can_init(void)
{
    struct can_configure config = CANDEFAULTCONFIG;
    config.privmode = RT_CAN_MODE_NOPRIV;
    config.ticks = 50;
#ifdef RT_CAN_USING_HDR
    config.maxhdr = 14;
#ifdef CAN2
    config.maxhdr = 28;
#endif
#endif

#ifdef BSP_USING_CAN1
    /* config default filter */
    drv_can1.can_filter_init.Filter_Num            = 0;
    drv_can1.can_filter_init.Filter_Mode           = CAN_Filter_IdMaskMode;
    drv_can1.can_filter_init.Filter_Scale          = CAN_Filter_32bitScale;
    drv_can1.can_filter_init.Filter_HighId         = 0x0000;
    drv_can1.can_filter_init.Filter_LowId          = 0x0000;
    drv_can1.can_filter_init.FilterMask_HighId     = 0;
    drv_can1.can_filter_init.FilterMask_LowId      = 0;
    drv_can1.can_filter_init.Filter_FIFOAssignment = CAN_FIFO0;
    drv_can1.can_filter_init.Filter_Act            = ENABLE;
    drv_can1.device.config = config;
    /* register CAN1 device */
    rt_hw_can_register(&drv_can1.device, drv_can1.name, &_can_ops, &drv_can1);
#endif /* BSP_USING_CAN1 */

#ifdef BSP_USING_CAN2
    /* config default filter */
    drv_can2.can_filter_init.Filter_Num            = 0;
    drv_can2.can_filter_init.Filter_Mode           = CAN_Filter_IdMaskMode;
    drv_can2.can_filter_init.Filter_Scale          = CAN_Filter_32bitScale;
    drv_can2.can_filter_init.Filter_HighId         = 0x0000;
    drv_can2.can_filter_init.Filter_LowId          = 0x0000;
    drv_can2.can_filter_init.FilterMask_HighId     = 0;
    drv_can2.can_filter_init.FilterMask_LowId      = 0;
    drv_can2.can_filter_init.Filter_FIFOAssignment = CAN_FIFO0;
    drv_can2.can_filter_init.Filter_Act            = ENABLE;
    drv_can2.device.config = config;
    /* register CAN2 device */
    rt_hw_can_register(&drv_can2.device, drv_can2.name, &_can_ops, &drv_can2);
#endif /* BSP_USING_CAN2 */

    return 0;
}

INIT_BOARD_EXPORT(rt_hw_can_init);

#endif /* BSP_USING_CAN */

/************************** end of file ******************/