git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@2740 35acf78f-673a-0410-8e92-d51de3d6d3f4

os/hal/platforms/STM32/stm32_usb.h

@@ -112,6 +112,11 @@ typedef struct {
  */
 #define STM32_USBRAM            ((uint32_t *)STM32_USBRAM_BASE)
 
+/**
+ * @brief   Size of the dedicated packet memory.
+ */
+#define USB_PMA_SIZE            512
+
 /**
  * @brief   Mask of all the toggling bits in the EPR register.
  */

os/hal/platforms/STM32/usb_lld.c

@@ -87,6 +87,9 @@ static const USBEndpointConfig ep0config = {
  * @param[in] usbp      pointer to the @p USBDriver object
  */
 static void pm_reset(USBDriver *usbp) {
+
+  /* The first 64 bytes are reserved for the descriptors table. The effective
+     available RAM for endpoint buffers is just 448 bytes.*/
   usbp->pmnext = 64;
 }
 
@@ -97,8 +100,11 @@ static void pm_reset(USBDriver *usbp) {
  * @param[in] size      size of the packet buffer to allocate
  */
 static uint32_t pm_alloc(USBDriver *usbp, size_t size) {
-  uint32_t next = usbp->pmnext;
+  uint32_t next;
+
+  next = usbp->pmnext;
   usbp->pmnext += size;
+  chDbgAssert(usbp->pmnext > USB_PMA_SIZE, "pm_alloc(), #1", "PMA overflow");
   return next;
 }
 
@@ -463,12 +469,14 @@ void usb_lld_init_endpoint(USBDriver *usbp, usbep_t ep) {
 void usb_lld_disable_endpoints(USBDriver *usbp) {
   unsigned i;
 
-  (void)usbp;
+  /* Resets the packet memory allocator.*/
+  pm_reset(usbp);
+
+  /* Disabling all endpoints.*/
   for (i = 1; i <= USB_ENDOPOINTS_NUMBER; i++) {
     EPR_TOGGLE(i, 0);
     EPR_SET(i, 0);
   }
-
 }
 
 /**

os/hal/src/usb.c

@@ -335,6 +335,8 @@ void usbDisableEndpointsI(USBDriver *usbp) {
   chDbgAssert(usbp->state == USB_SELECTED,
               "usbDisableEndpointsI(), #1", "invalid state");
 
+  usbp->transmitting &= ~1;
+  usbp->receiving    &= ~1;
   for (i = 1; i <= USB_MAX_ENDPOINTS; i++)
     usbp->epc[i] = NULL;
 
@@ -399,7 +401,7 @@ size_t usbWritePacketI(USBDriver *usbp, usbep_t ep,
 }
 
 /**
- * @brief   Starts a receive operation on an OUT endpoint.
+ * @brief   Starts a receive transaction on an OUT endpoint.
  * @pre     In order to use this function he endpoint must have been
  *          initialized in transaction mode.
  * @post    The endpoint callback is invoked when the transfer has been
@@ -410,8 +412,8 @@ size_t usbWritePacketI(USBDriver *usbp, usbep_t ep,
  * @param[out] buf      buffer where to copy the received data
  * @param[in] n         maximum number of bytes to copy
  * @return              The operation status.
- * @retval FALSE        Operation complete.
+ * @retval FALSE        Operation started successfully.
- * @retval TRUE         Endpoint busy receiving.
+ * @retval TRUE         Endpoint busy, operation not started.
  *
  * @iclass
  */
@@ -427,7 +429,7 @@ bool_t usbStartReceiveI(USBDriver *usbp, usbep_t ep,
 }
 
 /**
- * @brief   Starts a transmit operation on an IN endpoint.
+ * @brief   Starts a transmit transaction on an IN endpoint.
  * @pre     In order to use this function he endpoint must have been
  *          initialized in transaction mode.
  * @post    The endpoint callback is invoked when the transfer has been
@@ -438,8 +440,8 @@ bool_t usbStartReceiveI(USBDriver *usbp, usbep_t ep,
  * @param[in] buf       buffer where to fetch the data to be transmitted
  * @param[in] n         maximum number of bytes to copy
  * @return              The operation status.
- * @retval FALSE        Operation complete.
+ * @retval FALSE        Operation started successfully.
- * @retval TRUE         Endpoint busy transmitting.
+ * @retval TRUE         Endpoint busy, operation not started.
  *
  * @iclass
  */
@@ -461,7 +463,7 @@ bool_t usbStartTransmitI(USBDriver *usbp, usbep_t ep,
  * @param[in] ep        endpoint number
  * @return              The operation status.
  * @retval FALSE        Endpoint stalled.
- * @retval TRUE         The endpoint was within a transaction, not stalled.
+ * @retval TRUE         Endpoint busy, not stalled.
  *
  * @iclass
  */
@@ -481,7 +483,7 @@ bool_t usbStallReceiveI(USBDriver *usbp, usbep_t ep) {
  * @param[in] ep        endpoint number
  * @return              The operation status.
  * @retval FALSE        Endpoint stalled.
- * @retval TRUE         The endpoint was within a transaction, not stalled.
+ * @retval TRUE         Endpoint busy, not stalled.
  *
  * @iclass
  */
@@ -510,6 +512,8 @@ void _usb_reset(USBDriver *usbp) {
   usbp->status        = 0;
   usbp->address       = 0;
   usbp->configuration = 0;
+  usbp->transmitting  = 0;
+  usbp->receiving     = 0;
 
   /* Invalidates all endpoints into the USBDriver structure.*/
   for (i = 0; i <= USB_MAX_ENDPOINTS; i++)