Diff: PPP-Blinky/ppp-blinky.h

Revision:

155:9c6a1d249e26

Parent:

154:18b2bd92f557

Child:

156:163c23249731

--- a/PPP-Blinky/ppp-blinky.h	Fri Sep 01 20:23:03 2017 +0000
+++ b/PPP-Blinky/ppp-blinky.h	Fri Sep 01 23:04:41 2017 +0000
@@ -39,24 +39,32 @@
 
 /// structure of TCP header
 typedef struct {
-    unsigned int        srcAdrR : 16; // byte reversed
-    unsigned int        dstAdrR : 16; // byte reversed
-    unsigned int        seqTcpR;      // byte reversed
-    unsigned int        ackTcpR;      // byte reversed
-    unsigned int        resvd1  : 4;  // reserved
-    unsigned int        offset  : 4; // tcp header length [5..15]
+    unsigned int    srcAdrR : 16; // byte reversed
+    unsigned int    dstAdrR : 16; // byte reversed
+    unsigned int    seqTcpR;      // byte reversed
+    unsigned int    ackTcpR;      // byte reversed
+    // a special union for the flag bits
     union {
-        unsigned int    flags   : 8; // 8 tcp flag bits
         struct {
-            unsigned int    f:1, // fin
-                     s:1, // syn
-                     r:1, // rst
-                     p:1, // psh
-                     a:1, // ack
-                     u:1; // urg
+            unsigned int resvd1  : 4;  // reserved
+            unsigned int offset  : 4; // tcp header length [5..15]
+            unsigned int flagFin:  1, // fin
+                     flagSyn    :  1, // syn
+                     flagRst    :  1, // rst
+                     flagPsh    :  1, // psh
+                     flagAck    :  1, // ack
+                     flagUrg    :  1, // urg
+                     flagEce    :  1, // ece
+                     flagCwr    :  1; // cwr
+            unsigned int windowR : 16; // byte reversed
         };
+        struct {
+            unsigned int            : 8; // already dealt with first 8 bits
+            unsigned int flagsTcp   : 8; // second 8 bits are the tcp flags
+        };
+
     };
-    unsigned int    windowR : 16; // byte reversed
+    // end of a special union for the flag bits
     unsigned int    checksumR : 16; // byte reversed
     unsigned int    urgentPointerR : 16; // byte reversed;
     unsigned int    tcpOptions[10]; // up to 10 words of options possible