Diff: modbus/modbus.h

Revision:

0:998a68b8defc

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modbus/modbus.h	Tue Sep 17 01:59:40 2019 +0000
@@ -0,0 +1,35 @@
+/*
+  modbus  comuunication class
+   By modular-2 team 2018/8/3
+  modbus  mode=RTU master/salve
+  usage:
+  master mode:
+     sendQuery
+     waitResponse
+  salve mode:
+        waitQuery
+        sendResponse
+   */
+#ifndef MODBUS_H
+#define MODBUS_H
+#include "mbed.h"
+class Modbus
+{
+    public:
+      Modbus(PinName tx, PinName rx,PinName txEnable, int baud);
+      bool sendQuery(uint8_t address,uint8_t function,uint16_t startAddress,uint16_t points);
+      int  waitResponse(uint8_t *data);
+      bool  waitQuery(uint8_t &address,uint8_t &function,uint16_t &startAddress,uint16_t &points);
+      bool sendResponse(uint8_t *data,uint8_t length); 
+    private:
+        uint8_t sbuf[32];
+        uint8_t rbuf[32];
+        Serial rs485;
+        DigitalOut dir;
+        uint8_t _address;
+        uint8_t _function;
+        uint16_t _startAddress;
+        uint16_t _points;
+        unsigned int  calculateCRC16( uint8_t *puchMsg,unsigned int  usDataLen);
+    };
+#endif    
\ No newline at end of file