实现附加功能：读0x10000寄存器

modbus/modbus.c

@@ -10,6 +10,11 @@ uint8_t ModbusErr;
 uint8_t ModbusCoil[1250];   /*10000/8=1250*/
 uint16_t ModbusReg[10000];
 
+/*附加功能：页寄存器*/
+uint16_t ModbusExtPage[1] = {0};    /*设置地址为0xFFFE*/
+/*附加功能：读取所有单数个寄存器*/
+uint16_t ModbusExtOdd[1] = {0};     /*设置地址为0xFFFF*/
+
 uint8_t ModbusRxBuf[MODBUS_RX_BUF_SIZE];    /*接收数组*/
 uint16_t ModbusRxLen = 0;                   /*接收数据长度*/
 uint8_t ModbusTxBuf[MODBUS_TX_BUF_SIZE];    /*发送数组*/
@@ -298,6 +303,7 @@ uint8_t ModbusReadRegs(uint16_t addres, uint16_t num)
     uint8_t readValH;
     uint8_t readValL;
     uint8_t dataLen;
+    uint32_t addresExt;
 
     /*操作地址超限*/
     if(addres > 0x270F || (addres + (num - 1)) > 0x270F)
@@ -311,16 +317,35 @@ uint8_t ModbusReadRegs(uint16_t addres, uint16_t num)
     }
 
     dataLen = num * 2;
-    for(uint16_t i = 0; i < num; i++)
+    if(ModbusExtPage[0] == 1)
     {
-        index = 3 + (i * 2);
-        /*将16位寄存器值拆分为两个8位*/
-        readValH = (uint8_t)(ModbusReg[addres + i] >> 8);
-        readValL = (uint8_t)(ModbusReg[addres + i] & 0x00FF);
+        addresExt = ((uint32_t)1 << 16) | addres;
+
+        for(uint16_t i = 0; i < num; i++)
+        {
+            index = 3 + (i * 2);
+            /*将16位寄存器值拆分为两个8位*/
+            readValH = (uint8_t)(ModbusReg[addresExt + i] >> 8);
+            readValL = (uint8_t)(ModbusReg[addresExt + i] & 0x00FF);
 
-        ModbusTxBuf[index] = readValH;
-        ModbusTxBuf[index + 1] = readValL;
+            ModbusTxBuf[index] = readValH;
+            ModbusTxBuf[index + 1] = readValL;
+        }
+    }
+    else
+    {
+        for(uint16_t i = 0; i < num; i++)
+        {
+            index = 3 + (i * 2);
+            /*将16位寄存器值拆分为两个8位*/
+            readValH = (uint8_t)(ModbusReg[addres + i] >> 8);
+            readValL = (uint8_t)(ModbusReg[addres + i] & 0x00FF);
+
+            ModbusTxBuf[index] = readValH;
+            ModbusTxBuf[index + 1] = readValL;
+        }
     }
+
     ModbusTxBuf[0] = SLAVE_ADDRES;
     ModbusTxBuf[1] = 0x03;
     ModbusTxBuf[2] = dataLen;
@@ -341,7 +366,14 @@ uint8_t ModbusWriteRegs(uint16_t addres, uint16_t num, uint8_t *data)
     /*操作地址超限*/
     if(addres > 0x270F || (addres + (num - 1)) > 0x270F)
     {
-        return ModbusErrReply(0x10, ERR_OPE_ADDRES);
+        if(addres == 0xFFFE && num == 1)
+        {
+            return ModbusWriteReg(addres, data);
+        }
+        else
+        {
+            return ModbusErrReply(0x10, ERR_OPE_ADDRES);
+        }
     }
     /*操作数量超限*/
     if(num == 0 || num > 123)
@@ -435,7 +467,14 @@ uint8_t ModbusWriteReg(uint16_t addres, uint8_t *data)
     /*操作地址超限*/
     if(addres > 0x270F)
     {
-        return ModbusErrReply(0x10, ERR_OPE_ADDRES);
+        if(addres == 0xFFFE)
+        {
+            ;
+        }
+        else
+        {
+            return ModbusErrReply(0x10, ERR_OPE_ADDRES);
+        }
     }
 
     writeValH = data[0];