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SAMA5 UDPHS: Small change to zero length packet handling

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This commit is contained in:
Gregory Nutt 2013-09-03 16:24:11 -06:00
parent adc7248d6c
commit 3e505efe73
1 changed files with 9 additions and 3 deletions
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12
arch/arm/src/sama5/sam_udphs.c
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@ -1395,11 +1395,17 @@ static int sam_req_write(struct sam_usbdev_s *priv, struct sam_ep_s *privep)
} }
} }
/* No data to send... is there a trailing zero length packet transfer /* No data to send... This can happen on one of two ways:
* pending? * (1) The last packet sent was the final packet of a transfer
* and was exactly maxpacketsize and the protocol expects
* a zero length packet to follow (privep->txnullpkt will be
* set). Or (2) we called with a request packet that has
* len == 0 (privep->txnullpkt will not be set). Either case
* means that it is time to send a NULL packet and complete
* this transfer.
*/ */
else if (privep->txnullpkt) else
{ {
/* If we get here, then we sent the last of the data on the /* If we get here, then we sent the last of the data on the
* previous pass and we need to send the zero length packet now. * previous pass and we need to send the zero length packet now.