void ENET_IRQHandler (void)
{
uint32_t int_stat;
EMAC_PACKETBUF_Type RxDatbuf = {
.pbDataBuf = uip_buf,
};
// Get EMAC interrupt status
while ((int_stat = (LPC_EMAC->IntStatus & LPC_EMAC->IntEnable)) != 0) {
LPC_EMAC->IntClear = int_stat; /*clear interrupt*/
if ((int_stat & EMAC_INT_RX_DONE))
{
if (EMAC_CheckReceiveDataStatus(EMAC_RINFO_ERR_MASK)) {
/*error*/
goto rel;
}
/*copy frame to uip buffer*/
uip_len = RxDatbuf.ulDataLen = EMAC_GetReceiveDataSize() - 3;
EMAC_ReadPacketBuffer(&RxDatbuf);
packet_received = 1;
rel:
/*release frame from EMAC buffer*/
EMAC_UpdateRxConsumeIndex();
}
}
}
/* receive an Ethernet frame from MAC/DMA controller */
UNS_32 tapdev_read(void * pPacket)
{
UNS_32 Size = EMAC_MAX_PACKET_SIZE;
UNS_32 in_size;
EMAC_PACKETBUF_Type RxPack;
// Check Receive status
if (EMAC_CheckReceiveIndex() == FALSE){
return (0);
}
// Get size of receive data
in_size = EMAC_GetReceiveDataSize() + 1;
Size = MIN(Size,in_size);
// Setup Rx packet
RxPack.pbDataBuf = (uint32_t *)pPacket;
RxPack.ulDataLen = Size;
EMAC_ReadPacketBuffer(&RxPack);
// update receive status
EMAC_UpdateRxConsumeIndex();
return(Size);
}
/**
* @brief Receive Data Packet Done Callback function.
* Called by EMAC Standard Interrupt handler in EMAC driver
*
* Note: All packets are greater than (TX_PACKET_SIZE + 4)
* will be ignore!
*/
void RxDone_UsrCBS(void)
{
EMAC_PACKETBUF_Type RxDatbuf;
uint32_t RxLen;
/* Packet received, check if packet is valid. */
if (EMAC_CheckReceiveIndex()){
if (!EMAC_CheckReceiveDataStatus(EMAC_RINFO_LAST_FLAG)){
goto rel;
}
// Get data size, trip out 4-bytes CRC field, note that length in (-1) style format
RxLen = EMAC_GetReceiveDataSize() - 3;
// Note that packet added 4-bytes CRC created by yourself
if ((RxLen > (TX_PACKET_SIZE + 4)) || (EMAC_CheckReceiveDataStatus(EMAC_RINFO_ERR_MASK))) {
/* Invalid frame, ignore it and free buffer */
goto rel;
}
ReceiveLength = RxLen;
// Valid Frame, just copy it
RxDatbuf.pbDataBuf = (uint32_t *)gRxBuf;
RxDatbuf.ulDataLen = RxLen;
EMAC_ReadPacketBuffer(&RxDatbuf);
PacketReceived = TRUE;
rel:
/* Release frame from EMAC buffer */
EMAC_UpdateRxConsumeIndex();
}
_DBG_("Rx done");
RxDoneCount++;
}
/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param netif the lwip network interface structure for this lpc17xx_if
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf *
low_level_input(struct netif *netif)
{
struct pbuf *p, *q;
u16_t len;
if (EMAC_CheckReceiveIndex() == FALSE)
return NULL;
/* Obtain the size of the packet and put it into the "len"
variable. */
len = EMAC_GetReceiveDataSize() + 1;
#if ETH_PAD_SIZE
len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
#endif
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
#if ETH_PAD_SIZE
pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
/* We iterate over the pbuf chain until we have read the entire
* packet into the pbuf. */
for(q = p; q != NULL; q = q->next) {
/* Read enough bytes to fill this pbuf in the chain. The
* available data in the pbuf is given by the q->len
* variable.
* This does not necessarily have to be a memcpy, you can also preallocate
* pbufs for a DMA-enabled MAC and after receiving truncate it to the
* actually received size. In this case, ensure the tot_len member of the
* pbuf is the sum of the chained pbuf len members.
*/
EMAC_PACKETBUF_Type RxPack;
RxPack.pbDataBuf = q->payload;
RxPack.ulDataLen = q->len;
EMAC_ReadPacketBuffer(&RxPack);
}
#if ETH_PAD_SIZE
pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
LINK_STATS_INC(link.recv);
} else {
LINK_STATS_INC(link.memerr);
LINK_STATS_INC(link.drop);
}
EMAC_UpdateRxConsumeIndex();
return p;
}
/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param pxNetIf the lwip network interface structure for this etherpxNetIf
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf *prvLowLevelInput( void )
{
struct pbuf *p = NULL, *q;
const uint32_t ulCRCLength = 4UL;
uint32_t ulDataLength;
extern uint8_t *EMAC_NextPacketToRead( void );
uint8_t *pucReceivedData;
/* Obtain the length, minus the CRC. The CRC is four bytes
but the length is already minus 1. */
ulDataLength = EMAC_GetReceiveDataSize() - ( ulCRCLength - 1UL );
if( ulDataLength > 0U )
{
#if ETH_PAD_SIZE
len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
#endif
/* Allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc( PBUF_RAW, ulDataLength, PBUF_POOL );
if( p != NULL )
{
#if ETH_PAD_SIZE
pbuf_header( p, -ETH_PAD_SIZE ); /* drop the padding word */
#endif
/* Iterate over the pbuf chain until we have read the entire
packet into the pbuf. */
ulDataLength = 0UL;
pucReceivedData = EMAC_NextPacketToRead();
for( q = p; q != NULL; q = q->next )
{
/* Read enough bytes to fill this pbuf in the chain. The
available data in the pbuf is given by the q->len variable.
This does not necessarily have to be a memcpy, you can also preallocate
pbufs for a DMA-enabled MAC and after receiving truncate it to the
actually received size. In this case, ensure the usTotalLength member of the
pbuf is the sum of the chained pbuf len members. */
memcpy( q->payload, &( pucReceivedData[ ulDataLength ] ), q->len );
ulDataLength += q->len;
}
#if ETH_PAD_SIZE
pbuf_header( p, ETH_PAD_SIZE ); /* reclaim the padding word */
#endif
LINK_STATS_INC( link.recv );
}
}
return p;
}
// Reads the length of the received ethernet frame and checks if the
// destination address is a broadcast message or not
// returns the frame length
unsigned short StartReadFrame(void) {
unsigned short RxLen;
EMAC_PACKETBUF_Type RxPack;
RxLen = EMAC_GetReceiveDataSize() - 3;
// Copy packet to data buffer
RxPack.pbDataBuf = (uint32_t *)pgBuf;
RxPack.ulDataLen = RxLen;
EMAC_ReadPacketBuffer(&RxPack);
// Point to the data buffer
rptr = (unsigned short *)pgBuf;
return(RxLen);
}
static void prvEMACHandlerTask( void *pvParameters )
{
size_t xDataLength;
const uint16_t usCRCLength = 4;
xNetworkBufferDescriptor_t *pxNetworkBuffer;
xIPStackEvent_t xRxEvent = { eEthernetRxEvent, NULL };
/* This is not included in the header file for some reason. */
extern uint8_t *EMAC_NextPacketToRead( void );
( void ) pvParameters;
configASSERT( xEMACRxEventSemaphore );
for( ;; )
{
/* Wait for the EMAC interrupt to indicate that another packet has been
received. The while() loop is only needed if INCLUDE_vTaskSuspend is
set to 0 in FreeRTOSConfig.h. */
while( xSemaphoreTake( xEMACRxEventSemaphore, portMAX_DELAY ) == pdFALSE );
/* At least one packet has been received. */
while( EMAC_CheckReceiveIndex() != FALSE )
{
/* Obtain the length, minus the CRC. The CRC is four bytes
but the length is already minus 1. */
xDataLength = ( size_t ) EMAC_GetReceiveDataSize() - ( usCRCLength - 1U );
if( xDataLength > 0U )
{
/* Obtain a network buffer to pass this data into the
stack. No storage is required as the network buffer
will point directly to the buffer that already holds
the received data. */
pxNetworkBuffer = pxNetworkBufferGet( 0, ( portTickType ) 0 );
if( pxNetworkBuffer != NULL )
{
pxNetworkBuffer->pucEthernetBuffer = EMAC_NextPacketToRead();
pxNetworkBuffer->xDataLength = xDataLength;
xRxEvent.pvData = ( void * ) pxNetworkBuffer;
/* Data was received and stored. Send a message to the IP
task to let it know. */
if( xQueueSendToBack( xNetworkEventQueue, &xRxEvent, ( portTickType ) 0 ) == pdFALSE )
{
vNetworkBufferRelease( pxNetworkBuffer );
iptraceETHERNET_RX_EVENT_LOST();
}
}
else
{
iptraceETHERNET_RX_EVENT_LOST();
}
iptraceNETWORK_INTERFACE_RECEIVE();
}
/* Release the frame. */
EMAC_UpdateRxConsumeIndex();
}
}
}
int _EMAC_GetReceiveDataSize(uint8_t * args)
{
sprintf((char *) str, "%x\r\n", (unsigned int) EMAC_GetReceiveDataSize());
writeUSBOutString(str);
return 0;
}
/*********************************************************************//**
* @brief Ethernet service routine handler
* @param[in] none
* @return none
**********************************************************************/
void ENET_IRQHandler (void)
{
EMAC_PACKETBUF_Type RxDatbuf;
uint32_t RxLen;
/* EMAC Ethernet Controller Interrupt function. */
uint32_t int_stat;
// Get EMAC interrupt status
while ((int_stat = (LPC_EMAC->IntStatus & LPC_EMAC->IntEnable)) != 0) {
// Clear interrupt status
LPC_EMAC->IntClear = int_stat;
/* scan interrupt status source */
/* ---------- receive overrun ------------*/
if((int_stat & EMAC_INT_RX_OVERRUN))
{
RXOverrunCount++;
_DBG_("Rx overrun");
}
/*----------- receive error -------------*/
/* Note:
* The EMAC doesn't distinguish the frame type and frame length,
* so, e.g. when the IP(0x8000) or ARP(0x0806) packets are received,
* it compares the frame type with the max length and gives the
* "Range" error. In fact, this bit is not an error indication,
* but simply a statement by the chip regarding the status of
* the received frame
*/
if ((int_stat & EMAC_INT_RX_ERR))
{
if (EMAC_CheckReceiveDataStatus(EMAC_RINFO_RANGE_ERR) == RESET){
RXErrorCount++;
_DBG_("Rx error: ");
}
}
/* ---------- RX Finished Process Descriptors ----------*/
if ((int_stat & EMAC_INT_RX_FIN))
{
RxFinishedCount++;
_DBG_("Rx finish");
}
/* ---------- Receive Done -----------------------------*/
/* Note: All packets are greater than (TX_PACKET_SIZE + 4)
* will be ignore!
*/
if ((int_stat & EMAC_INT_RX_DONE))
{
/* Packet received, check if packet is valid. */
if (EMAC_CheckReceiveIndex()){
if (!EMAC_CheckReceiveDataStatus(EMAC_RINFO_LAST_FLAG)){
goto rel;
}
// Get data size, trip out 4-bytes CRC field, note that length in (-1) style format
RxLen = EMAC_GetReceiveDataSize() - 3;
// Note that packet added 4-bytes CRC created by yourself
if ((RxLen > (TX_PACKET_SIZE + 4)) || (EMAC_CheckReceiveDataStatus(EMAC_RINFO_ERR_MASK))) {
/* Invalid frame, ignore it and free buffer */
goto rel;
}
ReceiveLength = RxLen;
// Valid Frame, just copy it
RxDatbuf.pbDataBuf = (uint32_t *)gRxBuf;
RxDatbuf.ulDataLen = RxLen;
EMAC_ReadPacketBuffer(&RxDatbuf);
PacketReceived = TRUE;
rel:
/* Release frame from EMAC buffer */
EMAC_UpdateRxConsumeIndex();
}
_DBG_("Rx done");
RxDoneCount++;
}
/*------------------- Transmit Underrun -----------------------*/
if ((int_stat & EMAC_INT_TX_UNDERRUN))
{
TXUnderrunCount++;
_DBG_("Tx under-run");
}
/*------------------- Transmit Error --------------------------*/
if ((int_stat & EMAC_INT_TX_ERR))
{
TXErrorCount++;
_DBG_("Tx error");
}
/* ----------------- TX Finished Process Descriptors ----------*/
if ((int_stat & EMAC_INT_TX_FIN))
{
TxFinishedCount++;
_DBG_("Tx finish");
}
/* ----------------- Transmit Done ----------------------------*/
if ((int_stat & EMAC_INT_TX_DONE))
{
TxDoneCount++;
_DBG_("Tx done");
}
#if ENABLE_WOL
/* ------------------ Wakeup Event Interrupt ------------------*/
/* Never gone here since interrupt in this
* functionality has been disable, even if in wake-up mode
*/
if ((int_stat & EMAC_INT_WAKEUP))
{
WOLCount++;
}
#endif
}
}