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Correction to the ZLP fix for the STM32 F4 OTG FS driver

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4591 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2012-04-11 18:12:03 +00:00
parent 35a50c6eb2
commit f873ab55b6
1 changed files with 17 additions and 1 deletions
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18
arch/arm/src/stm32/stm32_otgfsdev.c
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@ -1027,6 +1027,11 @@ static void stm32_epin_request(FAR struct stm32_usbdev_s *priv,
if (privreq->req.len == 0)
{
/* The ZLP flag is set TRUE whenever we want to force the driver to
* send a zero-length-packet on the next pass through the loop (below).
* The flag is cleared whenever a packet is sent in the loop below.
*/
privep->zlp = true;
}
@ -1043,6 +1048,10 @@ static void stm32_epin_request(FAR struct stm32_usbdev_s *priv,
bytesleft = privreq->req.len - privreq->req.xfrd;
nbytes = bytesleft;
/* Assume no zero-length-packet on the next pass through this loop */
privep->zlp = false;
/* Limit the size of the transfer to one full packet and handle
* zero-length packets (ZLPs).
*/
@ -1053,7 +1062,6 @@ static void stm32_epin_request(FAR struct stm32_usbdev_s *priv,
* the request.
*/
privep->zlp = false;
if (nbytes >= privep->ep.maxpacket)
{
nbytes = privep->ep.maxpacket;
@ -1066,6 +1074,14 @@ static void stm32_epin_request(FAR struct stm32_usbdev_s *priv,
if (bytesleft == privep->ep.maxpacket &&
(privreq->req.flags & USBDEV_REQFLAGS_NULLPKT) != 0)
{
/* The ZLP flag is set TRUE whenever we want to force
* the driver to send a zero-length-packet on the next
* pass through this loop. The flag is cleared (above)
* whenever we are committed to sending any packet and
* set here when we want to force one more pass through
* the loop.
*/
privep->zlp = true;
}
}