Diff: main.cpp

Revision:

0:2cf4880c312a

Child:

1:9e03798d4367

diff -r 000000000000 -r 2cf4880c312a main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Dec 27 16:42:24 2016 +0000
@@ -0,0 +1,57 @@
+#include "mbed.h"
+
+// Proof-of-concept for TCP/IP using Windows 7/8/10 Dial Up Networking over MBED USB Virtual COM Port
+
+// Toggles LED1 every time the PC tries to establish a Dial-up Networking Connection
+
+Serial pc(USBTX, USBRX); // The USB com port - Set this up as a Dial-Up Modem
+
+DigitalOut myled(LED1);
+
+#define BUFLEN (1<<12)
+char rxbuf[BUFLEN];
+
+int headPointer = 0; // head of receive buffer
+int tailPointer = 0; // tail of receive buffer
+
+void rxHandler() // serial port receive interrupt handler
+{
+    rxbuf[headPointer]=pc.getc(); // insert in buffer
+    __disable_irq();
+    headPointer=(headPointer+1)&(BUFLEN-1);
+    __enable_irq();
+}
+
+int pc_readable() // check if buffer has data
+{
+    return (headPointer==tailPointer) ? 0 : 1 ;
+}
+
+int pc_getBuf() // get one character from the buffer
+{
+    if (pc_readable()) {
+        int x = rxbuf[tailPointer];
+        tailPointer=(tailPointer+1)&(BUFLEN-1);
+        return x;
+    }
+    return -1;
+}
+
+int main()
+{
+    pc.baud(115200);
+    pc.attach(&rxHandler,Serial::RxIrq); // activate the receive interrupt handler
+    int waitingForPpp = 1; // client string not found yet
+    while(1) {
+        while ( pc_readable() ) {
+            pc_getBuf(); // for now just flush input
+            char * clientFound = strstr( rxbuf, "CLIENTCLIENT" ); // look for string
+            if( clientFound ) {
+                strcpy( clientFound, "FOUND!FOUND!" ); // overwrite found string
+                if (waitingForPpp) pc.printf("CLIENTSERVER"); // respond to PC
+                waitingForPpp = waitingForPpp ? 0 : 1; // TOGGLE waiting flag
+            }
+            myled = waitingForPpp ? 1 : 0; // display found status on led
+        }
+    }
+}