Diff: CDU2FS_message_4.cpp

Revision:

7:6576a287e563

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CDU2FS_message_4.cpp	Thu Jul 17 10:09:14 2014 +0000
@@ -0,0 +1,88 @@
+// L. van der Kolk, ELVEDEKA, Holland 
+// File:  CDU2FS_message_4.cpp 
+//
+// -- Message handling from CDU to FS --
+
+#include "mbed.h"
+#include "MODSERIAL.h"
+#include "keys.h"
+#include "debug_lvdk.h" // : debug mode control
+
+extern MODSERIAL USB;
+extern MODSERIAL SERIAL_DEBUG;
+extern int CDU_FS_interface;
+
+int key_hit_ID = 0;   // : number of key that was hit, 0 = no hit of any key. ( global flag )
+
+char key_message[25]   =  "$PCDUKEY,";  // : setup begin of KEY message to FS
+char alive_message[25] =  "$PCDUOKE,";  // : setup begin of ALIVE message to FS
+
+
+void send_message_to_FS(char *message_string) {
+    // Common fnction to send a created message string (KEY or OKE) to the FS.
+    // Parameter is pointer to char string that has to be sent.
+    // Interface can be USB port or Ethernet port.
+    int i = 0;
+    if ( CDU_FS_interface == 0 ) {  // : messages will be sent out by USB port
+        while (  message_string[i] != '\0' ) {
+                   USB.putc(message_string[i]);
+                   i++;
+        }
+    }
+    if ( CDU_FS_interface == 1 )  { 
+     // Messages will be sent out by Ehternet interface
+     // - Not implemented -
+    }
+}
+
+
+void Send_ALIVE_message(int seconds){
+    int i;
+    char byte_read;
+    char exor_byte = 0;
+     //Create alive message:
+        i = 9; // : i points to first place after "$PCDUOKE,"
+        // Add seconds in 2 dec digits and a '*' char :
+        sprintf(&alive_message[i],"%02d*",seconds); 
+        // Calculate checksum now : 
+        i = 1; // : i points to first place after '$'
+        do { byte_read = alive_message[i];
+             if (byte_read == '*') break; // : exclude '*' from exor calculation
+             exor_byte = exor_byte ^ byte_read;
+             i++;
+        } while ( i < 20 );
+        i++;  // : i now points to first digit of checksum after '*'
+        // Add exor_byte in 2 hex chars (with upper case A-F) and a CR + LF:
+        sprintf(&alive_message[i],"%02X\r\n",exor_byte); // : + extra NULL char added by sprintf 
+        send_message_to_FS(alive_message); // : send message to defined CDU-FS interface
+        
+}
+
+void Send_KEY_message(int key_nr) {
+        // Function creates a valid KEY message out of key_nr parameter.
+        // Based on key_nr, a key char string is looked up and added to the message.
+        // After adding a checksum, the total KEY message will be sent.
+        int i;
+        char byte_read;
+        char exor_byte = 0;
+        //  Create key message, starting with "$PCDUKEY," message header
+        i = 9; // : i points to first position after "$PCDUKEY," message header 
+        // Add key string to message string including '*' 
+        
+        if ( key_nr != 0 && key_nr < max_keys_CDUpanel ) {
+             strcpy(&key_message[i],key_value[key_nr]); 
+            // Calculate checksum now : 
+            i = 1; // : i points to first place after '$' in message
+            do { byte_read = key_message[i];
+                if (byte_read == '*') break; // : exclude '*' from calculation
+                exor_byte = exor_byte ^ byte_read;
+                i++;
+            } while ( i < 20 );
+            i++;  // : i now points to first digit of checksum after '*'
+            // Add exor_byte in 2 hex digits and a CR + LF:
+            sprintf(&key_message[i],"%02X\r\n",exor_byte); // : extra NULL char added by sprintf
+            send_message_to_FS(key_message); // : send message to defined CDU-FS interface 
+        } 
+}           
+        
+   
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