ad26.c

sdcc是为51等小型嵌入式cpu设计的c语言编译器支持数种不同类型的cpu

//---------------------------------------------------------------------------
// Copyright (C) 2000 Dallas Semiconductor Corporation, All Rights Reserved.
// 
// 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 DALLAS SEMICONDUCTOR 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.
// 
// Except as contained in this notice, the name of Dallas Semiconductor 
// shall not be used except as stated in the Dallas Semiconductor 
// Branding Policy. 
//--------------------------------------------------------------------------
//
//  ad26.c - Reads the voltage on the 1-Wire
//  version 1.00
//

// Include Files
#include <stdio.h>
#include "ownet.h"
#include "ad26.h"

int Volt_AD(int portnum, int vdd, uchar *SNum)
{
   uchar send_block[50];
   uchar test;
   int send_cnt=0;
   int i;
   ushort lastcrc8;
   int busybyte; 

   owSerialNum(portnum,SNum,FALSE);
   // Recall the Status/Configuration page
   // Recall command
   send_block[send_cnt++] = 0xB8;

   // Page to Recall
   send_block[send_cnt++] = 0x00;

   if(!owBlock(portnum,FALSE,send_block,send_cnt))
      return FALSE;

   send_cnt = 0;

   if(owAccess(portnum))
   {
      // Read the Status/Configuration byte
      // Read scratchpad command
      send_block[send_cnt++] = 0xBE;

      // Page for the Status/Configuration byte
      send_block[send_cnt++] = 0x00;

      for(i=0;i<9;i++)
         send_block[send_cnt++] = 0xFF;

      if(owBlock(portnum,FALSE,send_block,send_cnt))
      {
	setcrc8(portnum,0);

         for(i=2;i<send_cnt;i++)
	   lastcrc8 = docrc8(portnum,send_block[i]);

         if(lastcrc8 != 0x00)
            return FALSE;
      }//Block
      else
         return FALSE;

      test = send_block[2] & 0x08;
      if(((test == 0x08) && vdd) || ((test == 0x00) && !(vdd)))
         return TRUE;
   }//Access

   if(owAccess(portnum))
   {
      send_cnt = 0;
      // Write the Status/Configuration byte
      // Write scratchpad command
      send_block[send_cnt++] = 0x4E;

      // Write page
      send_block[send_cnt++] = 0x00;

      if(vdd)
         send_block[send_cnt++] = send_block[2] | 0x08;
      else
         send_block[send_cnt++] = send_block[2] & 0xF7;

      for(i=0;i<7;i++)
         send_block[send_cnt++] = send_block[i+4];

      if(owBlock(portnum,FALSE,send_block,send_cnt))
      {
         send_cnt = 0;

         if(owAccess(portnum))
         {
            // Copy the Status/Configuration byte
            // Copy scratchpad command
            send_block[send_cnt++] = 0x48;

            // Copy page
            send_block[send_cnt++] = 0x00;

            if(owBlock(portnum,FALSE,send_block,send_cnt))
            {
               busybyte = owReadByte(portnum);
         
               while(busybyte == 0)
                  busybyte = owReadByte(portnum);

               return TRUE;
            }//Block
         }//Access
      }//Block

   }//Access

   return FALSE;
}
      

float Volt_Reading(int portnum, int vdd, uchar *SNum)
{
   uchar send_block[50];
   int send_cnt=0;
   int i;
   int busybyte; 
   uchar lastcrc8;
   ushort volts;
   float ret=-1.0;

   if(Volt_AD(portnum,vdd,SNum))
   {

      if(owAccess(portnum))
      {
         if(!owWriteByte(portnum,0xB4))
         {
	   //output_status(LV_ALWAYS,(char *)"DIDN'T WRITE CORRECTLY\n");
	   printf ("DIDN'T WRITE CORRECTLY\n");
	   return ret;
         }

         busybyte = owReadByte(portnum);
         
         while(busybyte == 0)
            busybyte = owReadByte(portnum);
      }

      if(owAccess(portnum))
      {
         // Recall the Status/Configuration page
         // Recall command
         send_block[send_cnt++] = 0xB8;

         // Page to Recall
         send_block[send_cnt++] = 0x00;

         if(!owBlock(portnum,FALSE,send_block,send_cnt))
            return ret;
      }


      send_cnt = 0;

      if(owAccess(portnum))
      {
         // Read the Status/Configuration byte
         // Read scratchpad command
         send_block[send_cnt++] = 0xBE;

         // Page for the Status/Configuration byte
         send_block[send_cnt++] = 0x00;

         for(i=0;i<9;i++)
            send_block[send_cnt++] = 0xFF;

         if(owBlock(portnum,FALSE,send_block,send_cnt))
         {
            setcrc8(portnum,0);

            for(i=2;i<send_cnt;i++)
               lastcrc8 = docrc8(portnum,send_block[i]);

            if(lastcrc8 != 0x00)
               return ret;

         }
         else
            return ret;    
      
         volts = ((int)send_block[6] << 8) | send_block[5];
         ret = (float) volts/100;
      }//Access
   }

   return ret;

}

double Get_Temperature(int portnum,uchar *SNum)
{
   double ret=-1.0;
   uchar send_block[50];
   int send_cnt=0;
   int i;
   uchar lastcrc8;

   owSerialNum(portnum,SNum,FALSE);

   if(owAccess(portnum))
      // Convert Temperature command
      owWriteByte(portnum,0x44);

   msDelay(10);


   if(owAccess(portnum))
   {
      // Read the Status/Configuration byte
      // Read scratchpad command
      send_block[send_cnt++] = 0xBE;

      // Page for the Status/Configuration byte
      send_block[send_cnt++] = 0x00;

      for(i=0;i<9;i++)
         send_block[send_cnt++] = 0xFF;

      if(owBlock(portnum,FALSE,send_block,send_cnt))
      {
         setcrc8(portnum,0);

         for(i=2;i<send_cnt;i++) {
            lastcrc8 = docrc8(portnum,send_block[i]);
	 } printf ("\n");

         if(lastcrc8 != 0x00)
            return ret;

      }
      else
         return ret;    
      
      ret = ((((unsigned int)send_block[4] << 8) | send_block[3]) >> 3) * 0.03125;
   }//Access

   return ret;
}