git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@1178 35acf78f-673a-0410-8e92-d51de3d6d3f4

1 files changed, 41 insertions, 16 deletions

diff --git a/os/io/mac.c b/os/io/mac.c
index c6c5f0168..2d90afb70 100644
--- a/os/io/mac.c
+++ b/os/io/mac.c
@@ -30,7 +30,7 @@
 /**

  * @brief Transmit descriptors counter semaphore.
  */

-static Semaphore tdsem;

+static Semaphore tdsem, rdsem;

 

 /**

  * @brief MAC Driver initialization.
@@ -38,6 +38,7 @@ static Semaphore tdsem;
 void macInit(void) {

 

   chSemInit(&tdsem, MAC_TRANSMIT_DESCRIPTORS);

+  chSemInit(&rdsem, 0);

   mac_lld_init();

 }

 

@@ -71,6 +72,7 @@ void macStop(void) {
 

   max_lld_stop();

   chSemReset(&tdsem, MAC_TRANSMIT_DESCRIPTORS);

+  chSemReset(&rdsem, 0);

 }

 

 /**

@@ -80,14 +82,14 @@ void macStop(void) {
  *          invoking thread is queued until one is freed.

  *
  * @param[in] time the number of ticks before the operation timeouts,

- *             the following special values are allowed:

- *             - @a TIME_IMMEDIATE immediate timeout.

- *             - @a TIME_INFINITE no timeout.

- *             .

+ *            the following special values are allowed:

+ *            - @a TIME_IMMEDIATE immediate timeout.

+ *            - @a TIME_INFINITE no timeout.

+ *            .

  * @return A pointer to a @p MACTransmitDescriptor structure or @p NULL if

  *         the operation timed out or the driver went in stop mode.
  */

-MACTransmitDescriptor *macGetTransmitDescriptor(systime_t time) {

+MACTransmitDescriptor *macWaitTransmitDescriptor(systime_t time) {

   MACTransmitDescriptor *tdp;

 

   chSysLock();

@@ -109,25 +111,48 @@ MACTransmitDescriptor *macGetTransmitDescriptor(systime_t time) {
  */

 void macReleaseTransmitDescriptor(MACTransmitDescriptor *tdp) {

 

+  mac_lld_release_transmit_descriptor(tdp);

+}

+

+/**

+ * @brief Waits for a received frame.

+ * @details Stops until a frame is received and buffered. If a frame is

+ *          not immediately available then the invoking thread is queued

+ *          until one is received.

+ *

+ * @param[in] time the number of ticks before the operation timeouts,

+ *            the following special values are allowed:

+ *            - @a TIME_IMMEDIATE immediate timeout.

+ *            - @a TIME_INFINITE no timeout.

+ *            .

+ * @return A pointer to a @p MACReceiveDescriptor structure or @p NULL if

+ *         the operation timed out, the driver went in stop mode or some

+ *         transient error happened.

+ */

+MACReceiveDescriptor *macWaitReceiveDescriptor(systime_t time) {

+  MACReceiveDescriptor *rdp;

+

   chSysLock();

 

-  mac_lld_release_transmit_descriptor(tdp);

+  if (chSemWaitTimeoutS(&rdsem, time) == RDY_OK)

+    rdp = max_lld_get_receive_descriptor();

+  else

+    rdp = NULL;

 

   chSysUnlock();

+  return rdp;

 }

 

 /**

- * @brief Enqueues data to a @p MACTransmitDescriptor.

- *
- * @param[in] tdp the pointer to the @p MACTransmitDescriptor structure

- * @param buf pointer to the data buffer
- * @param size size of the data to be enqueued
+ * @brief Releases a receive descriptor.

+ * @details The descriptor and its buffer is made available for more incoming

+ *          frames.

+ *

+ * @param[in] rdp the pointer to the @p MACReceiveDescriptor structure

  */

-void macAddTransmitData(MACTransmitDescriptor *tdp,

-                        uint8_t *buf,

-                        size_t size) {

+void macReleaseTransmitDescriptor(MACReceiveDescriptor *rdp) {

 

-  mac_lld_add_transmit_data(tdp, buf, size);

+  mac_lld_release_receive_descriptor(rdp);

 }

 

 /** @} */