Diff: ModBus_util.cpp

Revision:

3:ebea8e061ae6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ModBus_util.cpp	Fri Jun 30 08:17:01 2017 +0000
@@ -0,0 +1,104 @@
+/* Copyright (C) 2013 Hiroshi Suga, MIT License
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute,
+ * sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "ModBus-TCP.h"
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+
+int Modbus::getHandler (int startRegister) {
+    int i;
+
+    for (i = 0; i < _handler_count; i ++) {
+        if (_handler[i].startRegister == startRegister) {
+            // found
+            return i;
+        }
+    }
+    return -1;
+}
+
+
+int Modbus::attachRead (void (*funcCgi)(int, unsigned short, unsigned short), int startRegister) {
+    if (_handler_count < MODBUS_MAX_HANDLES) {
+        _handler[_handler_count].startRegister = startRegister;
+        _handler[_handler_count].funcCgiRead = funcCgi;
+        _handler_count ++;
+        return 0;
+    } else {
+        return -1;
+    }
+}
+
+
+int Modbus::send (int id, unsigned short buffer[], int len) {
+    
+    char out[MODBUS_BUF_SIZE];
+     
+    
+    // Build MBAP Header
+    //Transaction Number :: Copy from Org message
+    out[0] = _state[id].start_message[0];
+    out[1] = _state[id].start_message[1];
+    
+    //Protcoll Identifier :: Always 0x0000
+    out[2] = 0x00;
+    out[3] = 0x00;
+    
+    // Length (bytes to follow after length bytes) of TCP Frame
+    out[4] = (char)(((len*2)+3)>> 8);
+    out[5] = (char)(((len*2)+3) & 0x00ff);
+    
+    //unit identifier (normally 0xff, but 0x00 is allowed
+    out[6] = 0xff;
+    
+    //MBAP Header build finished
+    
+    // Now the ModBus response
+    //Function code :: Copy from org message
+    out[7] = _state[id].start_message[7];
+    
+    //Byte count of Modbus response
+    out[8] = len*2;
+    
+    for(int i=0; i<len; i++) {
+        out[(i*2)+9] = (char)(buffer[i] >> 8);  
+        out[(i*2)+10] = (char)(buffer[i] & 0x00ff);  
+    }
+    
+   
+    
+    DBG("sending anser on child %i", id);
+    return _state[id].client->send(out, (len*2)+9);
+}
+
+int Modbus::sendToClient(int id, char buffer[], unsigned short len) {
+        return _state[id].client->send(buffer, len);
+ }
+ 
+
+int Modbus::from_hex (int ch) {
+  return isdigit(ch) ? ch - '0' : tolower(ch) - 'a' + 10;
+}
+ 
+int Modbus::to_hex (int code) {
+  static char hex[] = "0123456789abcdef";
+  return hex[code & 15];
+}