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Fix semaphore usage on lpc1768 emac #4449

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Merged
merged 1 commit into from
Jun 8, 2017
Merged

Fix semaphore usage on lpc1768 emac #4449

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5 changes: 4 additions & 1 deletion features/FEATURE_LWIP/lwip-interface/lwip-eth/arch/TARGET_NXP/lpc17_emac.c
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Original file line number Diff line number Diff line change
Expand Up @@ -604,10 +604,13 @@ static err_t lpc_low_level_output(struct netif *netif, struct pbuf *p)

/* Wait until enough descriptors are available for the transfer. */
/* THIS WILL BLOCK UNTIL THERE ARE ENOUGH DESCRIPTORS AVAILABLE */
while (dn > lpc_tx_ready(netif))
#if NO_SYS == 0
for (idx = 0; idx < dn; idx++) {
osSemaphoreAcquire(lpc_enetif->xTXDCountSem.id, osWaitForever);
}
MBED_ASSERT(dn <= lpc_tx_ready(netif));
#else
while (dn > lpc_tx_ready(netif))
osDelay(1);
#endif

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