Diff: main.cpp

Revision:

7:d78ed22a787d

Parent:

6:dc4c165f6b53

Child:

8:34cc66421054

diff -r dc4c165f6b53 -r d78ed22a787d main.cpp
--- a/main.cpp	Tue Jun 07 16:19:17 2016 +0000
+++ b/main.cpp	Tue Jun 07 19:37:59 2016 +0000
@@ -1,11 +1,18 @@
+/* Simpler prog based on the serial passthrough code to enable a command line driven test of esp8266
+* wifi modules.
+* NB this uses the mbed sleep() command to form a low power system but on some MCUs this is a problem
+* this works fine on an lpc1768 but not as yet on the KL25Z
+*/
 #include "mbed.h"
 
-RawSerial  pc(USBTX, USBRX);
-RawSerial  dev(p28,p27);
-DigitalOut led1(LED1);
-DigitalOut led4(LED4);
+RawSerial  pc(USBTX, USBRX); // serial terminal for the pc connection
+RawSerial  dev(p28,p27); // serial uart for connecting to the esp8266 tx,rx NB mbed tx must connect ot esp rx and vice versa
+DigitalOut led1(LED1); // twp leds  
+DigitalOut led4(LED4); // to allow visual check of bidirectional comms
 DigitalOut rst(p26);
 
+// subroutine to run anytime a serial interrupt arrives from the device
+// this basically passes everything thatthe device produces on to the pc terminal screen
 void dev_recv()
 {
     led1 = !led1;
@@ -13,7 +20,10 @@
         pc.putc(dev.getc());
     }
 }
-
+// subroutine to service the serial interrupt on the pc connection
+// this is a bit more complex - it takes what the use sends on the pc and copies it on to the device 
+// the esp should echo these straight back to the the pc if all is well
+// this also detects the end of command character which is ascii 13 (0x0d) adn adds a linefeed after it =asscii 10 (0x0a)
 void pc_recv()
 {
     char c;
@@ -22,7 +32,7 @@
         c=pc.getc();
         dev.putc(c);
         //pc.putc(c); // echo back
-        if(c==13) {dev.putc(10);
+        if(c==13) {dev.putc(10); // send the linefeed to complement the carriage return generated by return key on the pc
         pc.putc(10);
             }
     }