sockitowm:temp28: modify reading temperature function so that it could be used…

sockitowm:temp28: modify reading temperature function so that it could be used in WRPC, no 1s delays, no floating point

sockitowm:temp28: modify reading temperature function so that it could be used…
sockitowm:temp28: modify reading temperature function so that it could be used in WRPC, no 1s delays, no floating point
a309deee · Grzegorz Daniluk · 5892d062 · a309deee · a309deee
Commit a309deee authored Jul 11, 2012 by Grzegorz Daniluk
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Showing with 75 additions and 69 deletions

temp28.c sockitowm/temp28.c +74 -68

temp28.h sockitowm/temp28.h +1 -1

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--- a/sockitowm/temp28.c
+++ b/sockitowm/temp28.c
@@ -45,17 +45,19 @@
 // FALSE(0) could not read the temperature, perhaps device is not
 // in contact
 //
-int ReadTemperature28(int portnum, uchar *SerialNum, float *Temp)
+uint8_t ReadTemperature28(uint8_t portnum, uint8_t *SerialNum, int16_t *Temp)
 {
-   uchar rt=FALSE;
+  uint8_t rt=FALSE;
-   uchar send_block[30],lastcrc8 = 0;
+  uint8_t send_block[30],lastcrc8 = 0;
-   int send_cnt, tsht, i, loop=0;
+  int send_cnt, tsht, i;
-   int power = 0;
+  static int power = -1;
+  static uint8_t toggle = 0;
  // set the device serial number to the counter device
  owSerialNum(portnum,SerialNum,FALSE);
-   for (loop = 0; loop < 2; loop ++)
+  //we need to call this only once at the beginning
+  if(power==-1)
  {
    // check if the chip is connected to VDD
    if (owAccess(portnum))
@@ -63,28 +65,19 @@ int ReadTemperature28(int portnum, uchar *SerialNum, float *Temp)
      owWriteByte(portnum,0xB4);
      power = owReadByte(portnum);
    }
-      // access the device
-      if (owAccess(portnum))
-      {
-         // send the convert command and if nesessary start power delivery
-         if (power) {
-            if (!owWriteBytePower(portnum,0x44))
-               return FALSE;
-         } else {
-            if (!owWriteByte(portnum,0x44))
-               return FALSE;
  }
-         // sleep for 1 second
+  if(toggle) 
-         msDelay(1000);
+  {
+    if( owAccess(portnum))
+    {
      // turn off the 1-Wire Net strong pull-up
      if (power) {
        if (owLevel(portnum,MODE_NORMAL) != MODE_NORMAL)
          return FALSE;
      }
+      while(!owReadByte(portnum)){} //wait until conversion is done
      // access the device
      if (owAccess(portnum))
      {
@@ -113,15 +106,28 @@ int ReadTemperature28(int portnum, uchar *SerialNum, float *Temp)
            tsht = tsht | send_block[1];
            if (tsht & 0x00001000)
              tsht = tsht | 0xffff0000;
-                  *Temp = ((float) tsht)/16;
+            *Temp = (int16_t) tsht;
            // success
            rt = TRUE;
-                  break;
+            //break;
+          }
        }
      }
    }
  }
+  // access the device
+  if (owAccess(portnum))
+  {
+    // send the convert command and if nesessary start power delivery
+    if (power) {
+      if (!owWriteBytePower(portnum,0x44))
+        return FALSE;
+    } else {
+      if (!owWriteByte(portnum,0x44))
+        return FALSE;
+    }
+    toggle=1;
  }
  // return the result flag rt

--- a/sockitowm/temp28.h
+++ b/sockitowm/temp28.h
@@ -28,4 +28,4 @@
 //
 // ---------------------------------------------------------------------------
-int ReadTemperature28(int,uchar *,float *);
+uint8_t ReadTemperature28(uint8_t , uint8_t *,int16_t *);