Diff: main.cpp

Revision:

118:54d1936e3768

Parent:

117:c819ae068336

Child:

119:e14dd2bf0ea3

--- a/main.cpp	Mon Aug 07 15:06:25 2017 +0000
+++ b/main.cpp	Tue Aug 08 01:58:22 2017 +0000
@@ -48,12 +48,21 @@
 Serial xx(PC_10, PC_11); // Second serial port on NUCLEO boards - not required to run, if you get compile error here, change #define SERIAL_PORT_MONITOR_YES to #define SERIAL_PORT_MONITOR_NO
 #elif defined(TARGET_LPC11U24)
 #error The LPC11U24 does not have a second serial port to use for debugging - change SERIAL_PORT_MONITOR_YES back to SERIAL_PORT_MONITOR_NO
+#elif defined(YOUR_TARGET_BOARD_NAME_HERE)
+Serial xx(p9, p10); // insert your board's debug serial port pins here - and please send it to me if it works
 #else
 #error Add your target board's second serial port here if you want to use debugging - or choose SERIAL_PORT_MONITOR_NO
 #endif
 #define debug(x...) xx.printf (x) /* if we have a serial port we print debug messages */
+#define debugputc(x...) xx.putc(x)
+#define debugBaudRate(x...) xx.baud(x)
+#define debugPuts(x...) xx.puts(x)
 #else
-#define debug(x...) {} /* if we don't have a serial port we do nothing */
+// if we don't have a debug port the debug functions do nothing
+#define debug(x...) {}
+#define debugputc(x...) {}
+#define debugBaudRate(x...) {}
+#define debugPuts(x...) {}
 #endif
 
 // verbosity flags used in debug printouts - change to 1 to see increasingly more detailed debug info.
@@ -149,26 +158,6 @@
     led1 = ppp.ledState; // toggle led
 }
 
-void crcReset()
-{
-    ppp.crc=0xffff;   // crc restart
-}
-
-void crcDo(int x) // cumulative crc
-{
-    for (int i=0; i<8; i++) {
-        ppp.crc=((ppp.crc&1)^(x&1))?(ppp.crc>>1)^0x8408:ppp.crc>>1; // crc calculator
-        x>>=1;
-    }
-}
-
-int crcBuf(char * buf, int size) // crc on an entire block of memory
-{
-    crcReset();
-    for(int i=0; i<size; i++)crcDo(*buf++);
-    return ppp.crc;
-}
-
 // fill our own receive buffer with characters from the PPP serial port
 void fillbuf()
 {
@@ -192,6 +181,40 @@
     }
 }
 
+// print to debug port while checking for incoming characters
+void printWhileCheckingInput( char * data )
+{
+#ifdef SERIAL_PORT_MONITOR_YES
+    char * nextChar = data;
+    while( *nextChar != 0 ) {
+        debugputc( *nextChar ); // write one character to debug port
+        nextChar++;
+        fillbuf(); // check the PC input stream
+    }
+#endif
+}
+
+void crcReset()
+{
+    ppp.crc=0xffff;   // crc restart
+}
+
+void crcDo(int x) // cumulative crc
+{
+    for (int i=0; i<8; i++) {
+        ppp.crc=((ppp.crc&1)^(x&1))?(ppp.crc>>1)^0x8408:ppp.crc>>1; // crc calculator
+        x>>=1;
+    }
+    // fillbuf();
+}
+
+int crcBuf(char * buf, int size) // crc on an entire block of memory
+{
+    crcReset();
+    for(int i=0; i<size; i++)crcDo(*buf++);
+    return ppp.crc;
+}
+
 int rxbufNotEmpty()   // check if rx buffer has data
 {
     int emptyStatus = (ppp.rx.head==ppp.rx.tail) ? 0 : 1 ;
@@ -250,8 +273,11 @@
         void determinePacketType(); // declaration only
         determinePacketType();
     } else {
-        if (0) { // don't normally report FCS because windows frequently early-terminates packets, and early-terminated packets all have FCS errors.
-            debug("\nPPP FCS(crc) Error CRC=%x Length = %d\n",ppp.pkt.crc,ppp.pkt.len); // ignore packets with CRC errors but print a debug line
+        if (1) {
+            char pbuf[50]; // local print buffer
+            sprintf(pbuf, "\nPPP FCS(crc) Error CRC=%x Length = %d\n",ppp.pkt.crc,ppp.pkt.len); // print a debug line
+            printWhileCheckingInput( pbuf );
+            if(0) dumpPPPFrame();
         }
     }
 }
@@ -333,13 +359,13 @@
     char * udpPkt = ppp.pkt.buf+4; // udp packet start
     int headerSizeIP = (( udpPkt[0]&0xf)*4);
     char * udpBlock = udpPkt + headerSizeIP; // udp info start
-#ifndef SERIAL_PORT_MONITOR_NO
+#ifdef SERIAL_PORT_MONITOR_YES
     char * udpSrc = udpBlock; // source port
     char * udpDst = udpBlock+2; // destination port
 #endif
     char * udpLen = udpBlock+4; // udp data length
     char * udpInf = udpBlock+8; // actual start of info
-#ifndef SERIAL_PORT_MONITOR_NO
+#ifdef SERIAL_PORT_MONITOR_YES
     int srcPort = (udpSrc[0]<<8) | udpSrc[1];
     int dstPort = (udpDst[0]<<8) | udpDst[1];
     char * srcIP = udpPkt+12; // udp src addr
@@ -478,12 +504,24 @@
 
 void dumpHeaderIP (int outGoing)
 {
+
 #if defined(IP_HEADER_DUMP_YES) && defined(SERIAL_PORT_MONITOR_YES)
+    if(0) {
+        if ( ppp.pkt.buf[37] != 0x10 ) return;
+        if ( pc.readable() ) {
+            printWhileCheckingInput("DH_IP\n");    // flag this condition in debug
+            return;
+        }
+        if ((outGoing==1) && (ppp.pkt.buf[37]==0x11)) {
+            //printWhileCheckingInput("A\n");    // flag this condigtion in debug
+            return;
+        }
+    }
     char * ipPkt = ppp.pkt.buf+4; // ip packet start
     char * ident =      ipPkt+4;  // 2 bytes
+#ifdef UNUSED_IP_VARIABLES
     char * srcAdr =     ipPkt+12; // 4 bytes
     char * dstAdr =     ipPkt+16; // 4 bytes = total of 20 bytes
-#ifdef UNUSED_IP_VARIABLES
     char * version =    ipPkt;    // top 4 bits
     char * ihl =        ipPkt;    // bottom 4 bits
     char * dscp =       ipPkt+1;  // top 6 bits
@@ -504,21 +542,35 @@
     unsigned int checksumIP = (headercheck[0]<<8)|headercheck[1];
 #endif
     int identIP = (ident[0]<<8)|ident[1];
+    int n=0;
+    char pbuf[140]; // local print buffer
 #ifdef DUMP_FULL_IP_ADDRESS
-    xx.printf("IP %d.%d.%d.%d %d.%d.%d.%d ",srcAdr[0],srcAdr[1],srcAdr[2],srcAdr[3], dstAdr[0],dstAdr[1],dstAdr[2],dstAdr[3]); // full ip addresses
+    n=n+sprintf(pbuf+n, "IP %d.%d.%d.%d %d.%d.%d.%d ",srcAdr[0],srcAdr[1],srcAdr[2],srcAdr[3], dstAdr[0],dstAdr[1],dstAdr[2],dstAdr[3]); // full ip addresses
 #else
-    xx.printf("IP %d %d ",srcAdr[3], dstAdr[3]); // short format - only least significant byte of the ip addresses
+    n=n+sprintf(pbuf+n, "%s ", outGoing ? "ME" : "IP" ); // write ME for outgoing and IP for incoming IP packets
+    n=n+sprintf(pbuf+n, "%05d ",identIP); // ident is a good way to correlate our dumps with net monitor or wireshark traces
 #endif
-    xx.printf("Ident %05d ",identIP); // ident is a good way to correlate our dumps with net monitor or wireshark traces
+    printWhileCheckingInput( pbuf );
 #ifndef TCP_HEADER_DUMP_YES
-    xx.putc('\n'); // there is no TCP header dump, so terminate the line with \n
+    debugputc('\n'); // there is no TCP header dump, so terminate the line with \n
 #endif
 #endif
 }
 
 void dumpHeaderTCP(int outGoing)
 {
+
 #if defined(TCP_HEADER_DUMP_YES) && defined(SERIAL_PORT_MONITOR_YES)
+    if (0) {
+        if ( ppp.pkt.buf[37] != 0x10 ) return;
+        if ( pc.readable() ) {
+            printWhileCheckingInput("DH_TCP\n");    // flag this condition in debug
+            return;
+        }
+        if ((outGoing==1) && (ppp.pkt.buf[37]==0x11)) {
+            return;
+        }
+    }
     int headerSizeIP     = (ppp.pkt.buf[4]&0xf)*4; // header size of ip portion
     char * tcpStart      =  ppp.pkt.buf+4+headerSizeIP; // start of tcp packet
     char * seqtcp        = tcpStart + 4;  // 4 bytes
@@ -541,13 +593,27 @@
     if (flags & (1<<5)) flagInfo[2]='U';
     if (flags & (1<<6)) flagInfo[1]='E';
     if (flags & (1<<7)) flagInfo[0]='C';
+
+    char sflagInfo[4];
+    if (flags & (1<<1)) sflagInfo[0]='S';
+    if (flags & (1<<4)) sflagInfo[0]='A';
+    if (flags & (1<<3)) sflagInfo[0]='P';
+    if (flags & (1<<0)) sflagInfo[0]='F';
+    if (flags & (1<<2)) sflagInfo[0]='R';
+    sflagInfo[1]=' ';
+    sflagInfo[2]=0;
+    sflagInfo[3]=0;
+
+    //char pbuf[140]; // local print buffer
 #ifdef DUMP_IP_SEQUENCE_NUMBER
-    xx.printf("%s Seq %10u\n", flagInfo, seq); // tcp flags and the sequence number
-#else    
-    xx.printf("%s\n", flagInfo); // tcp flags only
-#endif    
-    if( (flags == (1<<4)) && outGoing ) // if this is a pure ack its probably then of the TCP link
-        xx.putc('\n'); // so insert an extra line to mark the end of the conversation
+    //sprintf(pbuf, "%s Seq %10u\n", flagInfo, seq); // tcp flags and the sequence number
+#else
+    //sprintf(pbuf, "%s\n", flagInfo); // tcp flags only
+#endif
+    printWhileCheckingInput( sflagInfo );
+    if( outGoing && ( ppp.pkt.buf[37] == 0x11 ) ) { // if this is an outgoing ACK/FIN with no data its probably the end of the TCP link
+        debugputc('\n'); // so insert an extra line to mark the end of the conversation
+    }
 #endif
 }
 
@@ -632,7 +698,7 @@
 void tcpHandler()
 {
     // IP header
-
+    //fillbuf();
     char * ipPkt = ppp.pkt.buf+4; // ip packet start
     char * ihl =        ipPkt;    // bottom 4 bits
     char * pktLen =     ipPkt+2;  // 2 bytes
@@ -703,7 +769,7 @@
             break;
         case TCP_FLAG_ACK | TCP_FLAG_PSH:
             if ( strncmp(tcpDataIn, "GET /", 5) == 0) { // check for an http GET command
-                flagsOut = TCP_FLAG_ACK | TCP_FLAG_FIN; // set outgoing FIN flag to ask them to close from their side
+                flagsOut = TCP_FLAG_ACK | TCP_FLAG_FIN | TCP_FLAG_PSH; // set outgoing FIN flag to ask them to close from their side
                 dataLen = httpResponse(tcpDataOut); // send an http response
             } else {
                 dataLen = tcpResponse(tcpDataOut,tcpDataSize); // not a web request, send a packet reporting number of received bytes
@@ -780,7 +846,10 @@
     memcpy( tcp-12, tempHold, 12); // restore the 12 bytes that the pseudo-header overwrote
     dumpHeaderIP(1); // dump outgoing IP header
     dumpHeaderTCP(1); // dump outgoing TCP header
-    wait_ms(20); // wait long enough to ensure we will be given time to dump the headers if we wanted to
+ //   for(int i=0; i<1; i++) {
+   //     wait_ms(1);    // wait long enough to ensure we will be given time to dump the headers if we wanted to
+     //   fillbuf();
+    //}
     send_pppFrame(); // All preparation complete - send the TCP response
 }
 
@@ -989,10 +1058,8 @@
 int main()
 {
     pc.baud(115200); // USB virtual serial port
-#ifndef SERIAL_PORT_MONITOR_NO
-    xx.baud(115200); // second serial port for debug messages
-    xx.puts("\x1b[2J\x1b[HReady\n"); // VT100 code for clear screen & home
-#endif
+    debugBaudRate(115200); // baud rate for our debug port if we have one
+    debugPuts("\x1b[2J\x1b[HReady\n"); // VT100 code for clear screen & home on our debug port
     pppInitStruct(); // initialize all the PPP properties
     while(1) {
         scanForConnectString(); // respond to connect command from windows dial up networking