bool vMACBWaitForInput(unsigned long ulTimeOut)
{
#ifdef FREERTOS_USED
// Just wait until we are signaled from an ISR that data is available, or
// we simply time out.
xSemaphoreTake( xSemaphore, ulTimeOut );
return true;
#else
unsigned long i;
volatile unsigned long ulEventStatus;
i = ulTimeOut * 1000;
// wait for an interrupt to occurs
do
{
if ( DataToRead != 0 )
{
// IT occurs, reset interrupt flag
portENTER_CRITICAL();
DataToRead--;
portEXIT_CRITICAL();
return true;
}
i--;
}while(i != 0);
// If the BNA bit is set, check if there is at least one available frame in
// the rx buffers.
ulEventStatus = AVR32_MACB.rsr;
if( ulEventStatus & AVR32_MACB_BNA_MASK )
{
AVR32_MACB.rsr = AVR32_MACB_BNA_MASK; // Clear
AVR32_MACB.rsr; // Read to force the previous write
if(ulMACBInputLength())
return true;
}
return false;
#endif
}
static struct pbuf *
low_level_input(struct netif *netif) {
struct pbuf *p = NULL;
struct pbuf *q;
u16_t len = 0;
static xSemaphoreHandle xRxSemaphore = NULL;
/* Parameter not used. */
( void ) netif;
if( xRxSemaphore == NULL )
{
vSemaphoreCreateBinary( xRxSemaphore );
}
/* Access to the emac is guarded using a semaphore. */
if( xSemaphoreTake( xRxSemaphore, netifGUARD_BLOCK_TIME ) )
{
/* Obtain the size of the packet. */
len = ulMACBInputLength();
if( len )
{
#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
/* Let the driver know we are going to read a new packet. */
vMACBRead( NULL, 0, len );
/* 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. */
vMACBRead( q->payload, q->len, len );
}
#if ETH_PAD_SIZE
pbuf_header( p, ETH_PAD_SIZE ); /* reclaim the padding word */
#endif
#if LINK_STATS
lwip_stats.link.recv++;
#endif /* LINK_STATS */
}
else
{
#if LINK_STATS
lwip_stats.link.memerr++;
lwip_stats.link.drop++;
#endif /* LINK_STATS */
}
}
xSemaphoreGive( xRxSemaphore );
}
return p;
}
