TMS570LC4357: 使用LWIP协议栈 emac功能收发数据，发送数据始终正常，接收数据在接收一段时间后不再进入中断接收

#pragma INTERRUPT(EMACCore0RxIsr, IRQ)
uint32 countrxisr = 0;
void EMACCore0RxIsr(void)
{   

    char* tmpptr;
    uint32_t        CurFinishCP     =       HWREG(EMAC_BASE + EMAC_RXCP(0));     /*当前已经完成数据接收的缓冲区指针*/
    EMACDesc_t*     RXCP            =       EMAC_SL_CurRXCP;/*当前处理的接收缓冲区指针*/
    MACFrame_t*     MacFramePtr     =       NULL;

    ECTRL_C0RXEN        =   0U;             /*在处理数据之前先禁用中断*/
    HWREG(EMAC_BASE + EMAC_RXCP(0))       =   CurFinishCP;    /*确认当前已经处理过的CP*/
    HWREG(EMAC_BASE + EMAC_MACEOIVECTOR)  =   1U;             /*确认接收中断处理完毕*/

	if ( countrxisr == 0U )   //first frame
	{
		HWREG(EMAC_BASE + EMAC_RXHDP(0))	 =	 CurFinishCP;
		EMAC_SL_CurRXCP = (EMACDesc_t*)CurFinishCP;
		RXCP = (EMACDesc_t*)CurFinishCP;
		countrxisr = 1;
	}/*当前接收队列已经到达队尾，重新将接收缓存区指针指向首位置*/
	else if (HWREG(EMAC_BASE + EMAC_RXHDP(0)) == 0U)
	{
        HWREG(EMAC_BASE + EMAC_RXHDP(0))	 =	 CurFinishCP;
		EMAC_SL_CurRXCP = (EMACDesc_t*)CurFinishCP;
		RXCP = (EMACDesc_t*)CurFinishCP;    
    }/*当前接收队列已经到达队尾，重新将接收缓存区指针指向首位置*/
	else
	{
		EMAC_SL_CurRXCP 	=	((EMACDesc_t*)(CurFinishCP)) + 1U;
		EMAC_SL_CurRXCP = (EMACDesc_t*)((char*)EMAC_SL_CurRXCP + 4);  /* appear 4 byte more data than 3137,so add this offsets */
	}/*更新最后一次处理的CP*/


	while ( (uint32_t)(RXCP) <= CurFinishCP )
    {
        /*1============================================================================1*/
        /*仅处理单包数据包，对于拆分的数据包直接丢弃*/
        if ( (RXCP->EOP == 1U) && (RXCP->SOP == 1U) )
        {
            MacFramePtr     =       (MACFrame_t*)EMACSwizzleData((uint32)RXCP->BufferPtr);     /*MAC层数据帧信息指针*/

            switch ( MacFramePtr->FrameType )
            {
                case IPV4_DT_ARP_FRAME :
                {
                    if ( EMACSwizzleData16(RXCP->Length) <= sizeof EMAC_SL_RXBuffer.Data[0].Buffer  )
                    {
                        memcpy(EMAC_SL_RXBuffer.Data[EMAC_SL_RXBuffer.Tail.Cnt].Buffer, EMACSwizzleData(RXCP->BufferPtr),EMACSwizzleData16(RXCP->Length));
                        EMAC_SL_RXBuffer.Tail.Cnt++;
                    }

                    break;
                }/*接收到ARP数据帧，先将数据存放到接收缓冲区中，稍候再处理*/

                case IPV4_DT_IP_FRAME :
                {
                    IPHeader_t* IPHeaderPtr     =   (IPHeader_t*)(EMACSwizzleData(RXCP->BufferPtr) + 14U);   /*当前数据包的IP头信息*/

                    if ( (IPHeaderPtr->SrcIP == REMOTE_IP_ADDR) && ((IPHeaderPtr->DstIP == LOCAL_IP_ADDR)||(IPHeaderPtr->DstIP == BROADCAST_IP_ADDR))&& (IPHeaderPtr->Protol == IP_PROTO_UDP)  )
                    {
                        EMAC_SL_IsRXRemoteUDPData       =   TRUE;

                        if ( EMACSwizzleData16(RXCP->Length) <= sizeof EMAC_SL_RXBuffer.Data[0].Buffer  )
                        {
                            memcpy(EMAC_SL_RXBuffer.Data[EMAC_SL_RXBuffer.Tail.Cnt].Buffer, EMACSwizzleData(RXCP->BufferPtr), EMACSwizzleData16(RXCP->Length));
                            EMAC_SL_RXBuffer.Tail.Cnt++;
                        }
                    }/*接收IP地址与本地IP地址匹配，且数据类型为UDP，则处理数据帧*/

                    break;
                }/*接收到IP数据帧，先将数据存放到接收缓冲区中，稍候再处理*/

                default :
                {
                    break;
                }
            }
        }
        /*1============================================================================1*/

        RXCP->Length    =   RX_BUFFER_SIZE;
        RXCP->OWNER     =   1U;
        RXCP++;
		RXCP = (char*)RXCP + 4; /* here don't know why data in buffer is 32* 5 byte while 3137 is 32 *4 byte, perhaps because of LWIP protocol */

    }

    ECTRL_C0RXEN    =   1U;     /*重新激活中断*/


}