void emacps_check_tx( xemacpsif_s *xemacpsif )
{
int tail = xemacpsif->txTail;
int head = xemacpsif->txHead;
if( head != tail )
{
for( ; ; )
{
if( ( xemacpsif->txSegments[ tail ].flags & XEMACPS_TXBUF_USED_MASK ) == 0 )
{
/* The driver is still waiting for the EMAC to sent this message.
When done, "TXBUF_USED" will be set. */
break;
}
#if( ipconfigZERO_COPY_TX_DRIVER != 0 )
#warning ipconfigZERO_COPY_TX_DRIVER is defined
{
void *pvBuffer = pxDMA_tx_buffers[ tail ];
NetworkBufferDescriptor_t *pxBuffer;
if( pvBuffer != NULL )
{
pxDMA_tx_buffers[ tail ] = NULL;
pxBuffer = pxPacketBuffer_to_NetworkBuffer( pvBuffer );
if( pxBuffer != NULL )
{
vReleaseNetworkBufferAndDescriptor( pxBuffer );
}
else
{
FreeRTOS_printf( ( "emacps_check_tx: Can not find network bufffer" ) );
}
}
}
#endif
/* Clear all but the "used" and "wrap" bits. */
if( tail < ipconfigNIC_N_TX_DESC - 1 )
{
xemacpsif->txSegments[ tail ].flags = XEMACPS_TXBUF_USED_MASK;
}
else
{
xemacpsif->txSegments[ tail ].flags = XEMACPS_TXBUF_USED_MASK | XEMACPS_TXBUF_WRAP_MASK;
}
if( ++tail == ipconfigNIC_N_TX_DESC )
{
tail = 0;
}
if( tail == head )
{
break;
}
}
xemacpsif->txTail = tail;
}
return;
}
static void prvEMACHandlerTask( void *pvParameters )
{
TimeOut_t xPhyTime;
TickType_t xPhyRemTime;
UBaseType_t uxCount;
#if( ipconfigZERO_COPY_TX_DRIVER != 0 )
NetworkBufferDescriptor_t *pxBuffer;
#endif
uint8_t *pucBuffer;
BaseType_t xResult = 0;
uint32_t xStatus;
const TickType_t ulMaxBlockTime = pdMS_TO_TICKS( EMAC_MAX_BLOCK_TIME_MS );
/* Remove compiler warnings about unused parameters. */
( void ) pvParameters;
configASSERT( xEMACTaskHandle );
vTaskSetTimeOutState( &xPhyTime );
xPhyRemTime = pdMS_TO_TICKS( PHY_LS_LOW_CHECK_TIME_MS );
for( ;; )
{
vCheckBuffersAndQueue();
if( ( ulISREvents & EMAC_IF_ALL_EVENT ) == 0 )
{
/* No events to process now, wait for the next. */
ulTaskNotifyTake( pdFALSE, ulMaxBlockTime );
}
if( ( ulISREvents & EMAC_IF_RX_EVENT ) != 0 )
{
ulISREvents &= ~EMAC_IF_RX_EVENT;
/* Wait for the EMAC interrupt to indicate that another packet has been
received. */
xResult = prvEMACRxPoll();
}
if( ( ulISREvents & EMAC_IF_TX_EVENT ) != 0 )
{
/* Future extension: code to release TX buffers if zero-copy is used. */
ulISREvents &= ~EMAC_IF_TX_EVENT;
while( xQueueReceive( xTxBufferQueue, &pucBuffer, 0 ) != pdFALSE )
{
#if( ipconfigZERO_COPY_TX_DRIVER != 0 )
{
pxBuffer = pxPacketBuffer_to_NetworkBuffer( pucBuffer );
if( pxBuffer != NULL )
{
vReleaseNetworkBufferAndDescriptor( pxBuffer );
tx_release_count[ 0 ]++;
}
else
{
tx_release_count[ 1 ]++;
}
}
#else
{
tx_release_count[ 0 ]++;
}
#endif
uxCount = uxQueueMessagesWaiting( ( QueueHandle_t ) xTXDescriptorSemaphore );
if( uxCount < GMAC_TX_BUFFERS )
{
/* Tell the counting semaphore that one more TX descriptor is available. */
xSemaphoreGive( xTXDescriptorSemaphore );
}
}
}
if( ( ulISREvents & EMAC_IF_ERR_EVENT ) != 0 )
{
/* Future extension: logging about errors that occurred. */
ulISREvents &= ~EMAC_IF_ERR_EVENT;
}
if( xResult > 0 )
{
/* A packet was received. No need to check for the PHY status now,
but set a timer to check it later on. */
vTaskSetTimeOutState( &xPhyTime );
xPhyRemTime = pdMS_TO_TICKS( PHY_LS_HIGH_CHECK_TIME_MS );
xResult = 0;
}
else if( xTaskCheckForTimeOut( &xPhyTime, &xPhyRemTime ) != pdFALSE )
{
/* Check the link status again. */
xStatus = ulReadMDIO( PHY_REG_01_BMSR );
if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != ( xStatus & BMSR_LINK_STATUS ) )
{
ulPHYLinkStatus = xStatus;
FreeRTOS_printf( ( "prvEMACHandlerTask: PHY LS now %d\n", ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0 ) );
}
vTaskSetTimeOutState( &xPhyTime );
if( ( ulPHYLinkStatus & BMSR_LINK_STATUS ) != 0 )
{
xPhyRemTime = pdMS_TO_TICKS( PHY_LS_HIGH_CHECK_TIME_MS );
}
else
{
xPhyRemTime = pdMS_TO_TICKS( PHY_LS_LOW_CHECK_TIME_MS );
}
}
}
}