[参考译文] TMS570LC4357：在使用 lwIP 协议&quot 的数据接收周期之后、EMAC 模块无法进入接收中断

void EMAC_LwIP_init (uint8_t * macAddress)
{
    unsigned int 	ipAddr;
    uint32  emacCtrlBase =  0xFCF78800U;
    uint32  emacBase =  0xFCF78000U;	

	EMACInit(emacCtrlBase,emacBase);
	IntMasterIRQEnable();//中断

   /* for static IP address. Change address as required, and uncomment the previous statement. */ 	
	uint8 ip_addr[4] = { 172, 22, 1, 1 };
	uint8 netmask[4] = { 255, 255, 255, 0 };
	uint8 gateway[4] = { 172, 22, 1, 1 };  
	ipAddr = lwIPInit(0, macAddress,
			*((uint32_t *)ip_addr),
			*((uint32_t *)netmask),
			*((uint32_t *)gateway),
			IPADDR_USE_STATIC  );
	

}

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

    char* tmpptr;
    uint32_t tmp = 0;
    uint32_t CurFinishCP = HWREG(EMAC_BASE + EMAC_RXCP(0)); /* Pointer to the buffer that has completed data reception */
    EMACDesc_t* RXCP = EMAC_SL_CurRXCP; /* Pointer to the current processing receive buffer */
    MACFrame_t* MacFramePtr = NULL;

    ECTRL_C0RXEN = 0U; /* Disable interrupts before processing data */
    HWREG(EMAC_BASE + EMAC_RXCP(0)) = CurFinishCP; /* Confirm the current processed CP (Complete Pointer) */
    HWREG(EMAC_BASE + EMAC_MACEOIVECTOR) = 1U; /* Acknowledge the completion of receive interrupt */

    if (countrxisr == 0U) // First frame
    {
        HWREG(EMAC_BASE + EMAC_RXHDP(0)) = CurFinishCP;
        EMAC_SL_CurRXCP = (EMACDesc_t*)CurFinishCP;
        RXCP = (EMACDesc_t*)CurFinishCP;
        countrxisr = 1;
    } /* When the current receive queue reaches the end, reassign the receive buffer pointer to the first position */
    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; // Original
    } /* When the current receive queue reaches the end, reassign the receive buffer pointer to the first position */
    else
    {
        EMAC_SL_CurRXCP = ((EMACDesc_t*)(CurFinishCP)) + 1U;
        EMAC_SL_CurRXCP = (EMACDesc_t*)((char*)EMAC_SL_CurRXCP + 4); /* Appear 4 bytes more data than 3137, so add this offset */
    } /* Update the last processed CP */

    while ((uint32_t)(RXCP) <= CurFinishCP)
    {
        /*1============================================================================1*/
        /* Only process single packet data, discard fragmented data packets */
        if ((RXCP->EOP == 1U) && (RXCP->SOP == 1U))
        {
            MacFramePtr = (MACFrame_t*)EMACSwizzleData((uint32)RXCP->BufferPtr); /* Pointer to MAC layer data frame information */

            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;
                } /* Received ARP data frame, store the data in the receive buffer for later processing */

                case IPV4_DT_IP_FRAME:
                {
                    IPHeader_t* IPHeaderPtr = (IPHeader_t*)(EMACSwizzleData(RXCP->BufferPtr) + 14U); /* IP header information of the current data packet */

                    
                    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++;
                        }
                    } /* Received IP address matches the local IP address and data type is UDP, then process the data frame */

                    break;
                } /* Received IP data frame, store the data in the receive buffer for later processing */

                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 bytes while 3137 is 32 * 4 bytes, perhaps because of the lwIP protocol */

    }

    ECTRL_C0RXEN = 1U; /* Reactivate interrupts */
}