Diff: main.cpp

Revision:

11:ca1e0ca3a673

Parent:

9:d49cdc77f867

--- a/main.cpp	Tue Nov 11 21:02:06 2014 +0000
+++ b/main.cpp	Sun Nov 23 08:13:26 2014 +0000
@@ -1,10 +1,22 @@
 #include "mbed.h"
 #include "dlms_comms.h"
+/** ---------------------------------------------------------------------------
+ * @brief This module was tested on a Nucleo F030R8 with dual UARTS
+ *  The debugger uart is the normal , and the second uart was used for
+ *  RS485 communications
+ * @note The ring buffers are 256 bytes, that implies that if an unsigned
+ *       char is used as index , the ++index wraps automatically, is other
+ *       ring buffer sizes is used, please wrap the head and tail indexes 
+ *       appropiate 
+ * @note The timer was instantiate and used dering debugging to display 
+ *       the timing.. kept just for incase one needs it
+**/
+
 // instantiate classes
 Timer       timer;
 // debug serial comms
 RawSerial   debugger(SERIAL_TX, SERIAL_RX);
-// rs485 comms 2nd uart
+// rs485 comms class on 2nd uart
 dlms_comms  dlms;
 
 DigitalOut myled(LED1);
@@ -18,10 +30,16 @@
 {
     // initialize serial communication at 115200 bits per second:
     debugger.baud (115200);
-    debugger.format();                           
-    debugger.printf ("\r\n\n>> DCU Battery Charger Nov 2014  \r\n");
+    // use the defaults
+    debugger.format();       
+    // annouce yourself to the world                    
+    debugger.printf ("\r\n\n>> Creatron RS485 test program Nov 2014  \r\n");
+    // start the timer
     timer.start();
+    // this allows the rs485 class to use the parent timer and printf classes
+    // in this class
     dlms.init  ( &debugger, &timer);
+    // initialise the rs485 class
     dlms.initialise  (9600, // baudrate    
                       8,    // bits,
                       'n',  // parity
@@ -36,14 +54,19 @@
     // timer to do some timing
     UINT_64        compare_ms  = 0l;
     UINT_64        current_ms; 
+    // my variable.. just a tester to 'see' the state of the RS485 transceiver
     bool           direction_485 = false;
+    // char to command functions
     char           ch;
     
     // initialise 
     setup();
-    debugger.printf (">> Demo .. \r\n");
+    debugger.printf (">> Ready.. \r\n"
+                     "   Press 1 to send RS485 PacketDemo .. \r\n");
+    // endless loop, glad I dont have to do this
     do
     {
+         // use the timer to toggle I am alife led 
          current_ms = timer.read_ms();
          current_ms -= compare_ms;         
          if (current_ms > POLL_TIME_MS)
@@ -54,33 +77,45 @@
              else
                 myled = true;
          }
+         
+         // try to detect a direction change on the RS485 transceiver
+         // and keep the user informed .. just for ammusement
          if (direction_485 != dlms.get_dir485())
          {
              direction_485 = dlms.get_dir485();
-             debugger.printf("\r\nDir Changed ");
+             debugger.printf("\r\n> Dir Changed ");
              if (direction_485)
                 debugger.printf("1 \r\n");
              else
                 debugger.printf("0 \r\n");
          }
+         // check to see if the user has a 'request' to be executed
          if (debugger.readable())
          {
               ch = debugger.getc() & 0x7f;
               switch (ch)
               {
+                 // fine .. 
                  case '1':
-                    dlms.send_packet ("\r\nDLMS Test 1 \r\n", 16);
+                    //  this was designed to send binary packets (structure), thus
+                    // if you want to send null terminated strings one could
+                    // just use the strlen() function for the amount of bytes 
+                    // to be send, the transmission (send_packet) will happily send zeros 
+                    dlms.send_packet ("\r\nSend test packet to RS485\r\n", 29);
                     break;
               }
+              // show some stats .. keep em happy
               debugger.printf (">> %c 0x%02X IRQ rxcount=%5ld txcount=%5ld Dir_485=%d\r\n", ch, ch, 
                                dlms.ret_rx_irq_count(),
                                dlms.ret_tx_irq_count(),
                                dlms.ret_dir_485());
          }
+         // if any char received on the RS485 bus, display it ..
+         // assumes this is printable
          if (dlms.char_available())
          {
-            debugger.printf("Rx Char ");
-            debugger.printf("%c\r\n", dlms.get_char());
+            ch = dlms.get_char();
+            debugger.printf("RX Char %c 0x%02X\r\n", ch, ch);
          }
     }
     while (1);