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SAM4E-EK UDP: prevent some bad recursive behavior

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This commit is contained in:
Gregory Nutt 2014-03-22 17:30:17 -06:00
parent 266ef59280
commit 293b5d7723
2 changed files with 42 additions and 34 deletions
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64
arch/arm/src/sam34/sam_udp.c
View File

@ -303,6 +303,7 @@ struct sam_ep_s
uint8_t halted:1; /* true: Endpoint feature halted */
uint8_t zlpneeded:1; /* Zero length packet needed at end of transfer */
uint8_t zlpsent:1; /* Zero length packet has been sent */
uint8_t wqbusy:1; /* Write request queue is busy (recursion avoidance kludge) */
};
struct sam_usbdev_s
@ -851,7 +852,7 @@ static void sam_req_wrsetup(struct sam_usbdev_s *priv,
/* Get the number of bytes remaining to be sent. */
DEBUGASSERT(privreq->req.xfrd <= privreq->req.len);
DEBUGASSERT(privreq->req.xfrd < privreq->req.len);
nbytes = privreq->req.len - privreq->req.xfrd;
/* Either send the maxpacketsize or all of the remaining data in
@ -868,24 +869,19 @@ static void sam_req_wrsetup(struct sam_usbdev_s *priv,
privreq->inflight = nbytes;
usbtrace(TRACE_WRITE(USB_EPNO(privep->ep.eplog)), nbytes);
/* Check if we are sending a zero length packet */
/* The new buffer pointer is the start of the buffer plus the number of
* bytes successfully transferred plus the number of bytes previously
* "in-flight".
*/
if (nbytes > 0)
buf = privreq->req.buf + privreq->req.xfrd;
/* Write packet in the FIFO buffer */
fifo = (volatile uint32_t *)SAM_UDPEP_FDR(epno);
for (; nbytes; nbytes--)
{
/* The new buffer pointer is the start of the buffer plus the number of
* bytes successfully transferred plus the number of bytes previously
* "in-flight".
*/
buf = privreq->req.buf + privreq->req.xfrd;
/* Write packet in the FIFO buffer */
fifo = (volatile uint32_t *)SAM_UDPEP_FDR(epno);
for (; nbytes; nbytes--)
{
*fifo = (uint32_t)(*buf++);
}
*fifo = (uint32_t)(*buf++);
}
/* Indicate that there we are in the sending state (even if this is a
@ -1044,20 +1040,27 @@ static int sam_req_write(struct sam_usbdev_s *priv, struct sam_ep_s *privep)
}
/* If all of the bytes were sent (including any final zero length
* packet) then we are finished with the request buffer), then we can
* return the request buffer to the class driver. The transfer may
* not finished yet, however. There may still be bytes in flight.
* The transfer is truly finished when we are called again and the
* request buffer is empty.
* packet) then we are finished with the request buffer and we can
* return the request buffer to the class driver. The state will
* remain IDLE only if nothing else was put in flight.
*
* Note that we will then loop to check to check the next queued
* write request.
*/
if (privreq->req.len >= privreq->req.xfrd &&
privep->epstate == UDP_EPSTATE_IDLE)
if (privep->epstate == UDP_EPSTATE_IDLE)
{
/* Return the write request to the class driver */
/* Return the write request to the class driver. Set the wqbusy
* bit to prevent being called recursively from any new submission
* generated by returning the write request.
*/
usbtrace(TRACE_COMPLETE(epno), privreq->req.xfrd);
DEBUGASSERT(privreq->req.len == privreq->req.xfrd);
privep->wqbusy = true;
sam_req_complete(privep, OK);
privep->wqbusy = false;
}
}
@ -2472,6 +2475,7 @@ static void sam_ep_reset(struct sam_usbdev_s *priv, uint8_t epno)
privep->halted = false;
privep->zlpneeded = false;
privep->zlpsent = false;
privep->wqbusy = false;
}
/****************************************************************************
@ -3078,9 +3082,6 @@ static int sam_ep_submit(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
epno = USB_EPNO(ep->eplog);
req->result = -EINPROGRESS;
req->xfrd = 0;
privreq->inflight = 0;
privep->zlpneeded = false;
privep->zlpsent = false;
flags = irqsave();
/* Handle IN (device-to-host) requests. NOTE: If the class device is
@ -3111,9 +3112,11 @@ static int sam_ep_submit(struct usbdev_ep_s *ep, struct usbdev_req_s *req)
sam_req_enqueue(&privep->reqq, privreq);
usbtrace(TRACE_INREQQUEUED(epno), req->len);
/* If the IN endpoint is IDLE, then transfer the data now */
/* If the IN endpoint is IDLE and there is not write queue
* processing in progress, then transfer the data now.
*/
if (privep->epstate == UDP_EPSTATE_IDLE)
if (privep->epstate == UDP_EPSTATE_IDLE && !privep->wqbusy)
{
ret = sam_req_write(priv, privep);
}
@ -3561,6 +3564,7 @@ static void sam_reset(struct sam_usbdev_s *priv)
privep->halted = false;
privep->zlpneeded = false;
privep->zlpsent = false;
privep->wqbusy = false;
}
/* Re-configure the USB controller in its initial, unconnected state */

12
configs/sam4e-ek/README.txt
View File

@ -276,10 +276,11 @@ Loading Code into SRAM with J-Link
J-Link> setpc <address of __start>
J-Link> ... start debugging ...
STATUS: As of this writing, I have no been successful writing to FLASH
using the GDB server. I think that this is because of issues with GPNVM1
settings and flash lock bits. In any event, the GDB server works great for
debugging after writing the program to FLASH using SAM-BA.
STATUS: As of this writing, I have not been successful writing to FLASH
using the GDB server; the write succeeds with no complaints, but the contents
of the FLASH memory remain unchanged. This may be because of issues with
GPNVM1 settings and flash lock bits? In any event, the GDB server works
great for debugging after writing the program to FLASH using SAM-BA.
Writing to FLASH using SAM-BA
=============================
@ -1153,6 +1154,9 @@ Configurations
This is another NSH example. If differs from the 'nsh' configuration
in that this configurations uses a USB serial device for console I/O.
STATUS:
2014-3-22: Partially functional, but not yet reliable.
NOTES:
1. See the NOTES in the description of the nsh configuration. Those