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void vMACHandleTask( void *pvParameters )
{
unsigned long i, ulInt;
unsigned portLONG ulLength;
unsigned long *pulBuffer;
static unsigned portLONG ulNextRxBuffer = 0;
for( ;; )
{
/* Wait for something to do. */
xSemaphoreTake( xMACInterruptSemaphore, portMAX_DELAY );
while( ( ulInt = ( EthernetIntStatus( ETH_BASE, pdFALSE ) & ETH_INT_RX ) ) != 0 )
{
ulLength = HWREG( ETH_BASE + MAC_O_DATA );
/* Leave room at the start of the buffer for the size. */
pulBuffer = ( unsigned long * ) &( uxRxBuffers.ucRxBuffers[ ulNextRxBuffer ][ 2 ] );
*pulBuffer = ( ulLength >> 16 );
/* Get the size of the data. */
pulBuffer = ( unsigned long * ) &( uxRxBuffers.ucRxBuffers[ ulNextRxBuffer ][ 4 ] );
ulLength &= 0xFFFF;
if( ulLength > 4 )
{
ulLength -= 4;
if( ulLength >= UIP_BUFSIZE )
{
/* The data won't fit in our buffer. Ensure we don't
try to write into the buffer. */
ulLength = 0;
}
/* Read out the data into our buffer. */
for( i = 0; i < ulLength; i += sizeof( unsigned portLONG ) )
{
*pulBuffer = HWREG( ETH_BASE + MAC_O_DATA );
pulBuffer++;
}
/* Store the length of the data into the separate array. */
ulRxLength[ ulNextRxBuffer ] = ulLength;
/* Use the next buffer the next time through. */
ulNextRxBuffer++;
if( ulNextRxBuffer >= emacNUM_RX_BUFFERS )
{
ulNextRxBuffer = 0;
}
/* Ensure the uIP task is not blocked as data has arrived. */
xSemaphoreGive( xEMACSemaphore );
}
}
EthernetIntEnable( ETH_BASE, ETH_INT_RX );
( void ) ulInt;
}
} |
阿莫论坛20周年了!感谢大家的支持与爱护!!
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