Changes between Version 8 and Version 9 of 802.11/wlan_exp/app_notes/tutorial_hop_mac/fast_hopping

Timestamp:

Aug 3, 2015, 2:31:51 PM (9 years ago)

Author:

chunter

Comment:

--

802.11/wlan_exp/app_notes/tutorial_hop_mac/fast_hopping

@@ -119 +119 @@
 
 }}} 
+
+
+=== Station (STA) ===
+
+Changes should be made to {{{wlan_mac_sta.c}}} in the project SDK workspace zip.
+
+---- 
+
+In the upcoming changes, we will make sure that the DCF in CPU_LOW boots into a state where frequency hopping is disabled. It is out job in the STA to explicitly enable the functionality. We will do this after we have associated with an AP and have adopted its TSF timebase. Add the following line to the top of the {{{sta_set_association_state()}}} function:
+
+{{{
+#!c
+
+wlan_mac_high_enable_hopping();
+
+}}}
 
 === MAC Low Framework ===
@@ -174 +190 @@
 }}}
 
+=== DCF ===
+
+Changes should be made to {{{wlan_mac_dcf.c}}} in the project SDK workspace zip.
+
+---- 
+
+We need to define the sequence of channels that a node should traverse through over time. Here, we have created a vector of length 1024 where each element is a valid 2.4 GHz Wi-Fi channel chosen pseudorandomly from a uniform distribution over the range of [1, 11]. Add this variable definition to the top of the DCF code:
+
+{{{
+#!c
+
+#define HOP_SEQ_LEN 1024
+u8 hop_vec[HOP_SEQ_LEN] = { 2, 10, 9, 6, 1, 3, 11, 8, 3, 8, 2, 7, 9, 5, 1, 7, 8, 2, 10, 6,
+ 4, 4, 8, 6, 5, 4, 7, 1, 7, 11, 6, 4, 9, 2, 1, 5, 6, 9, 8, 6,
+ 3, 2, 5, 5, 11, 11, 4, 10, 7, 6, 10, 9, 6, 1, 5, 5, 7, 2, 7, 5,
+ 1, 2, 5, 6, 4, 10, 7, 3, 2, 9, 8, 4, 1, 5, 6, 6, 10, 11, 5, 3,
+ 11, 8, 11, 8, 8, 5, 1, 7, 9, 8, 1, 2, 9, 6, 5, 4, 3, 11, 5, 2,
+ 6, 1, 7, 5, 9, 2, 6, 7, 1, 6, 9, 2, 8, 10, 6, 1, 4, 11, 2, 9,
+ 4, 4, 6, 5, 11, 4, 2, 3, 2, 9, 7, 8, 8, 7, 4, 2, 10, 4, 7, 6,
+ 8, 3, 4, 8, 11, 4, 10, 10, 10, 9, 3, 11, 10, 10, 9, 6, 10, 11, 1, 9,
+ 6, 7, 11, 10, 11, 4, 4, 4, 4, 7, 4, 11, 8, 9, 3, 2, 1, 7, 7, 5,
+ 1, 2, 6, 9, 9, 11, 9, 5, 4, 2, 7, 3, 2, 9, 6, 8, 2, 5, 7, 10,
+ 11, 4, 5, 2, 8, 3, 10, 5, 5, 2, 1, 9, 9, 6, 10, 7, 2, 1, 2, 4,
+ 9, 9, 2, 9, 2, 8, 1, 5, 9, 6, 11, 4, 7, 3, 5, 11, 4, 10, 8, 1,
+ 6, 8, 5, 2, 7, 11, 11, 11, 10, 8, 10, 10, 9, 2, 1, 6, 2, 5, 4, 5,
+ 11, 10, 11, 3, 1, 10, 8, 7, 3, 6, 1, 5, 3, 4, 11, 10, 3, 5, 9, 9,
+ 1, 3, 1, 8, 10, 4, 8, 2, 5, 10, 8, 8, 10, 4, 8, 4, 11, 9, 10, 9,
+ 9, 5, 2, 2, 9, 1, 6, 10, 11, 6, 1, 6, 3, 4, 11, 2, 9, 4, 6, 2,
+ 1, 10, 1, 10, 5, 5, 4, 1, 8, 4, 8, 9, 8, 6, 9, 1, 1, 5, 2, 9,
+ 1, 2, 5, 3, 11, 5, 6, 3, 7, 6, 11, 8, 10, 1, 5, 1, 7, 9, 8, 1,
+ 8, 4, 4, 8, 2, 3, 5, 7, 4, 5, 4, 11, 8, 2, 8, 1, 9, 1, 5, 8,
+ 1, 5, 2, 7, 3, 5, 10, 1, 8, 4, 10, 4, 5, 11, 10, 10, 11, 2, 4, 8,
+ 7, 10, 3, 4, 3, 1, 8, 4, 1, 4, 2, 1, 7, 1, 10, 1, 6, 2, 5, 10,
+ 8, 11, 5, 5, 9, 10, 8, 2, 4, 3, 3, 8, 4, 11, 10, 7, 10, 4, 7, 7,
+ 4, 7, 2, 9, 10, 8, 1, 11, 1, 3, 5, 5, 2, 11, 2, 9, 8, 4, 2, 11,
+ 10, 2, 5, 6, 9, 10, 11, 8, 7, 10, 5, 10, 9, 10, 5, 1, 10, 7, 9, 7,
+ 11, 2, 8, 2, 1, 7, 7, 9, 1, 1, 7, 9, 3, 6, 7, 7, 1, 3, 2, 6,
+ 9, 11, 1, 10, 10, 6, 5, 1, 2, 8, 7, 8, 5, 9, 6, 10, 1, 7, 9, 4,
+ 6, 10, 6, 9, 7, 10, 5, 2, 11, 5, 6, 8, 1, 4, 9, 1, 1, 4, 4, 9,
+ 3, 5, 8, 10, 7, 11, 11, 7, 11, 10, 4, 11, 10, 5, 9, 4, 2, 9, 7, 7,
+ 3, 4, 9, 7, 4, 4, 3, 6, 7, 1, 2, 6, 6, 6, 2, 2, 5, 8, 9, 7,
+ 7, 11, 6, 4, 3, 3, 5, 7, 11, 4, 4, 7, 3, 2, 1, 6, 1, 7, 7, 1,
+ 5, 9, 7, 5, 6, 5, 1, 9, 9, 7, 7, 7, 7, 3, 9, 8, 9, 2, 1, 9,
+ 9, 7, 1, 4, 11, 10, 8, 2, 8, 1, 7, 6, 8, 5, 1, 5, 6, 1, 7, 4,
+ 10, 11, 3, 4, 2, 8, 8, 7, 5, 7, 6, 8, 10, 4, 7, 1, 3, 9, 4, 1,
+ 8, 8, 8, 10, 2, 8, 5, 8, 4, 8, 4, 11, 5, 8, 9, 3, 8, 9, 8, 2,
+ 2, 9, 11, 9, 11, 7, 6, 1, 7, 9, 9, 3, 9, 8, 11, 5, 1, 4, 4, 6,
+ 1, 2, 3, 9, 10, 7, 4, 3, 1, 10, 3, 11, 2, 6, 5, 9, 11, 4, 11, 2,
+ 1, 10, 11, 7, 1, 10, 10, 7, 6, 1, 5, 9, 6, 6, 10, 1, 3, 2, 1, 4,
+ 10, 2, 11, 2, 6, 5, 8, 10, 4, 4, 1, 3, 9, 11, 8, 6, 8, 1, 10, 8,
+ 2, 6, 6, 7, 11, 7, 7, 11, 1, 8, 2, 7, 9, 1, 6, 4, 8, 7, 1, 10,
+ 11, 2, 1, 11, 5, 9, 11, 10, 11, 4, 8, 10, 10, 10, 1, 10, 7, 7, 9, 6,
+ 10, 2, 8, 7, 6, 3, 11, 11, 8, 2, 6, 6, 1, 5, 9, 9, 2, 5, 9, 3,
+ 7, 1, 8, 10, 8, 4, 6, 4, 3, 9, 7, 6, 11, 9, 7, 9, 7, 1, 6, 10,
+ 5, 3, 6, 5, 9, 9, 4, 11, 4, 3, 2, 4, 11, 8, 3, 4, 4, 10, 6, 7,
+ 9, 4, 3, 10, 1, 1, 4, 10, 6, 4, 6, 8, 7, 10, 1, 3, 8, 5, 4, 1,
+ 4, 5, 7, 3, 10, 10, 11, 7, 4, 9, 6, 7, 8, 1, 8, 4, 3, 4, 4, 3,
+ 2, 8, 4, 3, 7, 1, 10, 1, 3, 4, 8, 7, 8, 4, 11, 4, 6, 2, 10, 3,
+ 1, 5, 11, 3, 4, 6, 7, 5, 8, 2, 1, 1, 7, 10, 7, 6, 8, 5, 3, 7,
+ 7, 9, 3, 4, 1, 4, 4, 8, 7, 9, 10, 10, 1, 6, 1, 9, 4, 3, 3, 2,
+ 3, 10, 9, 9, 3, 2, 1, 4, 8, 7, 7, 3, 5, 4, 10, 9, 10, 5, 9, 1,
+ 11, 8, 3, 9, 6, 10, 4, 7, 3, 2, 3, 5, 8, 1, 8, 3, 10, 7, 6, 2,
+ 3, 5, 11, 6, 2, 11, 6, 10, 4, 9, 1, 3, 9, 8, 10, 7, 6, 9, 10, 10,
+ 10, 8, 5, 1};
+
+}}}
+
+---- 
+
+Next, we should create a top-level global variable that represents whether or not the frequency hopping mechanism is currently enabled. Add the following new global variable to the DCF code:
+
+{{{
+#!c
+
+static u8 enable_hop;
+
+}}}
+
+Next, we'll create setter functions that control this variable. Add the following functions to the DCF code:
+
+{{{
+#!c
+
+void enable_hopping(){
+        enable_hop = 1;
+}
+
+void disable_hopping(){
+        enable_hop = 0;
+}
+
+}}}
+
+We will now attach these new functions to the callbacks we just created in the MAC Low Framework. We will also explicitly call the {{{disable_hopping()}}} function at boot and wait for a CPU_HIGH project to explicitly tell us when we should enable the frequency hopping behavior. Add the following lines to the initialize code in {{{main()}}}:
+
+{{{
+#!c
+        disable_hopping();
+        wlan_mac_low_set_enable_hopping_callback((void*)enable_hopping);
+        wlan_mac_low_set_disable_hopping_callback((void*)disable_hopping);
+
+}}}
+
+== Characterizing the Design ==
+