unsigned long ulGetEMACRxData( void )
{
unsigned long ulLen = 0;
long lIndex;
if( EMAC->RxProduceIndex != EMAC->RxConsumeIndex )
{
/* Mark the current buffer as free as uip_buf is going to be set to
the buffer that contains the received data. */
prvReturnBuffer( uip_buf );
ulLen = ( RX_STAT_INFO( EMAC->RxConsumeIndex ) & RINFO_SIZE ) - 3;
uip_buf = ( unsigned char * ) RX_DESC_PACKET( EMAC->RxConsumeIndex );
/* Allocate a new buffer to the descriptor. */
RX_DESC_PACKET( EMAC->RxConsumeIndex ) = ( unsigned long ) prvGetNextBuffer();
/* Move the consume index onto the next position, ensuring it wraps to
the beginning at the appropriate place. */
lIndex = EMAC->RxConsumeIndex;
lIndex++;
if( lIndex >= NUM_RX_FRAG )
{
lIndex = 0;
}
EMAC->RxConsumeIndex = lIndex;
}
return ulLen;
}
void vSendEMACTxData( unsigned short usTxDataLen )
{
unsigned long ulAttempts = 0UL;
/* Check to see if the Tx descriptor is free, indicated by its buffer being
NULL. */
while( TX_DESC_PACKET( emacTX_DESC_INDEX ) != ( unsigned long ) NULL )
{
/* Wait for the Tx descriptor to become available. */
vTaskDelay( emacBUFFER_WAIT_DELAY );
ulAttempts++;
if( ulAttempts > emacBUFFER_WAIT_ATTEMPTS )
{
/* Something has gone wrong as the Tx descriptor is still in use.
Clear it down manually, the data it was sending will probably be
lost. */
prvReturnBuffer( ( unsigned char * ) TX_DESC_PACKET( emacTX_DESC_INDEX ) );
break;
}
}
/* Setup the Tx descriptor for transmission. Remember the length of the
data being sent so the second descriptor can be used to send it again from
within the ISR. */
usSendLen = usTxDataLen;
TX_DESC_PACKET( emacTX_DESC_INDEX ) = ( unsigned long ) uip_buf;
TX_DESC_CTRL( emacTX_DESC_INDEX ) = ( usTxDataLen | TCTRL_LAST | TCTRL_INT );
EMAC->TxProduceIndex = ( emacTX_DESC_INDEX + 1 );
/* uip_buf is being sent by the Tx descriptor. Allocate a new buffer. */
uip_buf = prvGetNextBuffer();
}
unsigned long ulEMACRead( void )
{
unsigned long ulBytesReceived;
ulBytesReceived = prvCheckRxFifoStatus();
if( ulBytesReceived > 0 )
{
/* Mark the pxDescriptor buffer as free as uip_buf is going to be set to
the buffer that contains the received data. */
prvReturnBuffer( uip_buf );
/* Point uip_buf to the data about ot be processed. */
uip_buf = ( void * ) pxCurrentRxDesc->buf_p;
/* Allocate a new buffer to the descriptor, as uip_buf is now using it's
old descriptor. */
pxCurrentRxDesc->buf_p = prvGetNextBuffer();
/* Prepare the descriptor to go again. */
pxCurrentRxDesc->status &= ~( FP1 | FP0 );
pxCurrentRxDesc->status |= ACT;
/* Move onto the next buffer in the ring. */
pxCurrentRxDesc = pxCurrentRxDesc->next;
if( EDMAC.EDRRR.LONG == 0x00000000L )
{
/* Restart Ethernet if it has stopped */
EDMAC.EDRRR.LONG = 0x00000001L;
}
}
return ulBytesReceived;
}
long lEMACInit( void )
{
long lReturn = pdPASS;
unsigned long ulID1, ulID2;
/* Reset peripherals, configure port pins and registers. */
prvSetupEMACHardware();
/* Check the PHY part number is as expected. */
ulID1 = prvReadPHY( PHY_REG_IDR1, &lReturn );
ulID2 = prvReadPHY( PHY_REG_IDR2, &lReturn );
if( ( (ulID1 << 16UL ) | ( ulID2 & 0xFFFFUL ) ) == KS8721_ID )
{
/* Set the Ethernet MAC Address registers */
EMAC->SA0 = ( configMAC_ADDR0 << 8 ) | configMAC_ADDR1;
EMAC->SA1 = ( configMAC_ADDR2 << 8 ) | configMAC_ADDR3;
EMAC->SA2 = ( configMAC_ADDR4 << 8 ) | configMAC_ADDR5;
/* Initialize Tx and Rx DMA Descriptors */
prvInitDescriptors();
/* Receive broadcast and perfect match packets */
EMAC->RxFilterCtrl = RFC_UCAST_EN | RFC_BCAST_EN | RFC_PERFECT_EN;
/* Setup the PHY. */
prvConfigurePHY();
}
else
{
lReturn = pdFAIL;
}
/* Check the link status. */
if( lReturn == pdPASS )
{
lReturn = prvSetupLinkStatus();
}
if( lReturn == pdPASS )
{
/* Initialise uip_buf to ensure it points somewhere valid. */
uip_buf = prvGetNextBuffer();
/* Reset all interrupts */
EMAC->IntClear = ( INT_RX_OVERRUN | INT_RX_ERR | INT_RX_FIN | INT_RX_DONE | INT_TX_UNDERRUN | INT_TX_ERR | INT_TX_FIN | INT_TX_DONE | INT_SOFT_INT | INT_WAKEUP );
/* Enable receive and transmit mode of MAC Ethernet core */
EMAC->Command |= ( CR_RX_EN | CR_TX_EN );
EMAC->MAC1 |= MAC1_REC_EN;
}
return lReturn;
}
void vEMACWrite( void )
{
long x;
/* Wait until the second transmission of the last packet has completed. */
for( x = 0; x < emacTX_WAIT_ATTEMPTS; x++ )
{
if( ( xTxDescriptors[ 1 ].status & ACT ) != 0 )
{
/* Descriptor is still active. */
vTaskDelay( emacTX_WAIT_DELAY_ms );
}
else
{
break;
}
}
/* Is the descriptor free after waiting for it? */
if( ( xTxDescriptors[ 1 ].status & ACT ) != 0 )
{
/* Something has gone wrong. */
prvResetEverything();
}
/* Setup both descriptors to transmit the frame. */
xTxDescriptors[ 0 ].buf_p = ( char * ) uip_buf;
xTxDescriptors[ 0 ].bufsize = uip_len;
xTxDescriptors[ 1 ].buf_p = ( char * ) uip_buf;
xTxDescriptors[ 1 ].bufsize = uip_len;
/* uip_buf is being sent by the Tx descriptor. Allocate a new buffer
for use by the stack. */
uip_buf = prvGetNextBuffer();
/* Clear previous settings and go. */
xTxDescriptors[0].status &= ~( FP1 | FP0 );
xTxDescriptors[0].status |= ( FP1 | FP0 | ACT );
xTxDescriptors[1].status &= ~( FP1 | FP0 );
xTxDescriptors[1].status |= ( FP1 | FP0 | ACT );
EDMAC.EDTRR.LONG = 0x00000001;
}
void vEMACWrite( void )
{
long x;
/* Wait until the second transmission of the last packet has completed. */
for( x = 0; x < emacTX_WAIT_ATTEMPTS; x++ )
{
if( ( xTxDescriptors[ 1 ].status & TX_BD_R ) != 0 )
{
/* Descriptor is still active. */
vTaskDelay( emacTX_WAIT_DELAY_ms );
}
else
{
break;
}
}
/* Is the descriptor free after waiting for it? */
if( ( xTxDescriptors[ 1 ].status & TX_BD_R ) != 0 )
{
/* Something has gone wrong. */
prvResetEverything();
}
/* Setup both descriptors to transmit the frame. */
xTxDescriptors[ 0 ].data = ( uint8_t * ) __REV( ( unsigned long ) uip_buf );
xTxDescriptors[ 0 ].length = __REVSH( uip_len );
xTxDescriptors[ 1 ].data = ( uint8_t * ) __REV( ( unsigned long ) uip_buf );
xTxDescriptors[ 1 ].length = __REVSH( uip_len );
/* uip_buf is being sent by the Tx descriptor. Allocate a new buffer
for use by the stack. */
uip_buf = prvGetNextBuffer();
/* Clear previous settings and go. */
xTxDescriptors[ 0 ].status |= ( TX_BD_R | TX_BD_L );
xTxDescriptors[ 1 ].status |= ( TX_BD_R | TX_BD_L );
/* Start the Tx. */
ENET_TDAR = ENET_TDAR_TDAR_MASK;
}
unsigned short usEMACRead( void )
{
unsigned short usBytesReceived;
usBytesReceived = prvCheckRxStatus();
usBytesReceived = __REVSH( usBytesReceived );
if( usBytesReceived > 0 )
{
/* Mark the pxDescriptor buffer as free as uip_buf is going to be set to
the buffer that contains the received data. */
prvReturnBuffer( uip_buf );
/* Point uip_buf to the data about to be processed. */
uip_buf = ( void * ) pxCurrentRxDesc->data;
uip_buf = ( void * ) __REV( ( unsigned long ) uip_buf );
/* Allocate a new buffer to the descriptor, as uip_buf is now using it's
old descriptor. */
pxCurrentRxDesc->data = ( uint8_t * ) prvGetNextBuffer();
pxCurrentRxDesc->data = ( uint8_t* ) __REV( ( unsigned long ) pxCurrentRxDesc->data );
/* Prepare the descriptor to go again. */
pxCurrentRxDesc->status |= RX_BD_E;
/* Move onto the next buffer in the ring. */
ulRxDescriptorIndex++;
if( ulRxDescriptorIndex >= emacNUM_RX_DESCRIPTORS )
{
ulRxDescriptorIndex = 0UL;
}
pxCurrentRxDesc = &( xRxDescriptors[ ulRxDescriptorIndex ] );
/* Restart Ethernet if it has stopped */
ENET_RDAR = ENET_RDAR_RDAR_MASK;
}
return usBytesReceived;
}
