RealTimeCompLab2
RealtimeCompLab2
Dependencies: mbed
Fork of
PPP-Blinky
by 
Nicolas Nackel
Diff: main.cpp
- Revision:
- 50:ad4e7c3c88e5
- Parent:
- 49:2213f9c132b2
- Child:
- 51:a86d56844324
- Child:
- 52:accc3026b2b0
--- a/main.cpp Tue Jan 24 19:34:28 2017 +0000
+++ b/main.cpp Sun Jan 29 00:58:03 2017 +0000
@@ -54,6 +54,8 @@
char frbuf[2000]; // send/receive buffer for ppp frames
// a structure to keep all our ppp globals in
+
+
struct pppType {
int online; // we hunt for a PPP connection if this is zero
int ident; // our IP ident value
@@ -70,6 +72,11 @@
int crc; // PPP CRC (frame check)
char * buf; // the actual buffer
} pkt; // ppp buffer objects
+ struct {
+ int frameStartIndex; // frame start marker
+ int frameEndIndex; // frame end marker
+ int frameBusy; // busy capturing a frame
+ } hdlc; // hdlc frame objects
};
pppType ppp; // our global - definitely not thread safe
@@ -86,6 +93,7 @@
ppp.ident=0;
ppp.seq=1000;
ppp.ledState=0;
+ ppp.hdlc.frameBusy=0;
}
void led1Toggle()
@@ -143,7 +151,7 @@
} else return -1;
}
-void processFrame(int start, int end) // process received frame
+void processHDLCFrame(int start, int end) // process received frame
{
led1Toggle(); // change led1 state on every frame we receive
if(start==end) {
@@ -539,7 +547,7 @@
if ( strncmp(dataStart, "GET / HTTP/1.1", 14) == 0) {
dataLen = 32*32; // this block has to hold the web page below, but keep it under 1024 or increase this
memset(dataStart,'x', dataLen ); // initialize the data block
-
+
int n=0; // number of bytes we have printed so far
n=n+sprintf(n+dataStart,"HTTP/1.1 200 OK\r\nServer: PPP-Blinky\r\n"); // http header
n=n+sprintf(n+dataStart,"Content-Length: "); // http header
@@ -550,17 +558,17 @@
n=n+sprintf(n+dataStart,"<!DOCTYPE html>\n<html><head><title>mbed-PPP-Blinky</title>\n<script>window.onload=function()"); // html start
n=n+sprintf(n+dataStart,"{setInterval(function(){function x(){return document.getElementById('w');};\n"); // html
- n=n+sprintf(n+dataStart,"x().textContent = parseInt(x().textContent)+1;},100);};</script></head>\n"); // html
+ n=n+sprintf(n+dataStart,"x().textContent = parseInt(x().textContent)+1;},100);};</script></head>\n"); // html
n=n+sprintf(n+dataStart,"<body style=\"font-family: sans-serif; font-size:30px; color:#807070\">"); // html
n=n+sprintf(n+dataStart,"<h1>mbed PPP-Blinky Up and Running</h1>\n<h1 id=\"w\" style=\"text-align:"); // html
n=n+sprintf(n+dataStart," center;\">0</h1><h1><a href=\"http://bit.ly/pppBlink2\">Source on mbed</a></h1>\n</body></html>\r\n"); // html end
-
+
int contentLength = n-nHeader; // Content-Length is the count of every character after the header
int cSize = 5; // maximum number of digits we allow for Content-Length
char contentLengthString[cSize+1]; // temporary buffer to create Content-Length string
snprintf(contentLengthString,cSize+1,"%*d",cSize,contentLength); // print Content-Length with leading spaces and fixed width = csize
memcpy(dataStart+contentLengthStart, contentLengthString, cSize); // copy Content-Length to the send buffer
-
+
if (v0) {
debug("HTTP GET BufferSize %d*32=%d Header %d Content-Length %d Total %d Available %d\n",dataLen/32,dataLen,nHeader,contentLength,n,dataLen-n);
}
@@ -568,7 +576,7 @@
} else if ( strncmp(dataStart, "GET /", 4) == 0) { // all other HTTP GET requests get 404 Not Found response
dataLen = 32*32; // maximum size for File not found webpage
memset(dataStart,'x', dataLen ); // initialize the data block
-
+
int n=0; // number of bytes we have printed so far
n=n+sprintf(n+dataStart,"HTTP/1.1 404 Not Found\r\nServer: PPP-Blinky\r\n"); // http header
n=n+sprintf(n+dataStart,"Content-Length: "); // http header
@@ -841,6 +849,31 @@
}
}
+void wait_for_HDLC_frame()
+{
+
+ while ( rxbufNotEmpty() ) {
+ int rx = pc_getBuf();
+ if (ppp.hdlc.frameBusy) {
+ if (rx==FRAME_7E) {
+ ppp.hdlc.frameBusy=0; // done gathering frame
+ if (ppp.rx.tail == 0) { // did we just wrap around?
+ ppp.hdlc.frameEndIndex=BUFLEN-1; // wrap back to end of buffer
+ }
+ else {
+ ppp.hdlc.frameEndIndex=ppp.rx.tail-1; // remember where frame ends
+ }
+ processHDLCFrame(ppp.hdlc.frameStartIndex, ppp.hdlc.frameEndIndex);
+ }
+ } else {
+ if (rx==FRAME_7E) {
+ ppp.hdlc.frameBusy=1; // start gathering frame
+ ppp.hdlc.frameStartIndex=ppp.rx.tail; // remember where frame started
+ }
+ }
+ }
+}
+
void scanForConnectString()
{
if ( ppp.online==0 ) {
@@ -862,28 +895,9 @@
xx.puts("\x1b[2J\x1b[HReady\n"); // VT100 code for clear screen & home
#endif
pppInitStruct(); // initialize all the PPP properties
-
pc.attach(&rxHandler,Serial::RxIrq); // start the receive handler
-
- int frameStartIndex, frameEndIndex;
- int frameBusy=0;
-
while(1) {
- if ( ppp.online==0 ) scanForConnectString(); // try to connect
- while ( rxbufNotEmpty() ) {
- int rx = pc_getBuf();
- if (frameBusy) {
- if (rx==FRAME_7E) {
- frameBusy=0; // done gathering frame
- frameEndIndex=ppp.rx.tail-1; // remember where frame ends
- processFrame(frameStartIndex, frameEndIndex);
- }
- } else {
- if (rx==FRAME_7E) {
- frameBusy=1; // start gathering frame
- frameStartIndex=ppp.rx.tail; // remember where frame started
- }
- }
- }
+ if ( ppp.online==0 ) scanForConnectString(); // respond to connect string from PC
+ wait_for_HDLC_frame();
}
}