Changes between Version 21 and Version 22 of WANMAC

Timestamp:

Jul 21, 2006, 12:18:24 PM (18 years ago)

Author:

varunnayyar

Comment:

--

WANMAC

@@ -135 +135 @@
 When the MAC program is executed, it sets up the external devices that must be used ([source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@211#L890 Ethernet], [source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@211#L1128 Radio and PHY], and [source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@211#L1297 Automatic Gain Control]).
 
-== Typedefs == This section contains all the data structures used in the protocol with their explaination.
+== Typedefs == 
+
+This section contains all the data structures used in the protocol with their explaination.
 
 [source:/ResearchApps/MAC/WANMAC/Basestation/basestation.h@305#L46 pduStruct]
@@ -170 +172 @@
 as for newly added subscriber ids. So far we are not using this, as this is used for Network Entry Protocol.
 
-== Functions ==
-[source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@91#L1022 ackmac_main]
-
-This function is the primary thread spawned by the xilkernel via the shell. It really has two purposes: during startup it must initialize memory spaces and do general set-up tasks such as setting up interrupts, and during all other times, it polls over status bytes that determine if the node is ready and able to transmit a new packet, and if so, it calls the tx function.
-
-[source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@91#L547 tx]
+== Base Station Functions ==
+[source:/ResearchApps/MAC/WANMAC/Basestation/basestation.c@305#L51 timer_a_int_handler]
+This is the interrupt handler for the first timer peripheral.  It checks to see which was the state it was called in and then changes values of 
+global variables accordingly. This is mainly used to tell when the slot for receiving and transmitting ends.
+
+
+[source:/ResearchApps/MAC/WANMAC/Basestation/basestation.c@305#L51 rxPhyBad]
+This function is used to keep a track of the number of bad packets ( CRC Error ) Received. After receiving it simply
+resets the receiver.
+
+
+[source:/ResearchApps/MAC/WANMAC/Basestation/basestation.c@305#L51 rxPhyGood]
+This function is called when a packet with the correct CRC is received. It copies the packet into the memory. It then checks the state of the 
+BS machine and the Connection ID of the packet received with the expected Connection ID. Else it simply frees the buffer and in the end
+resets the receiver. Note, the resetting of the receiver is a must and it must be the last step after packet processing.
+
+
+[source:/ResearchApps/MAC/WANMAC/Basestation/basestation.c@305#L51 BSRxInsertQueuebyMAC]
+The function is called when a packet needs to be inserted into a specific queue of the Base Station. This abstracts the behaviour of the 
+PHY-MAC interaction. The queues are circular and this maintains a notion of a flag, to ensure it does not overwrite on any queue location.
+
+
+
+
+ 
+
+
+
+
+
+ 
+
+
 
 The transmitter can send new packets, resend old packets, send ACKs and send nACKs, depending on what state the machine is in when it is called. To help abstraction, the transmitter does not directly send packets. Instead, it passes them off to a dedicated function that interfaces directly with the PHY layer (see mem2ifc).
@@ -185 +214 @@
 [source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@91#L238 timer_a_int_handler]
 
-This is the interrupt handler for the first timer peripheral.  It updates the number of dropped packets and number of timeouts, then sets the backoff timer before attempting to resend.
 
 [source:/ResearchApps/MAC/ACKMAC/src/ackmac.c@91#L773 setTimer]