Diff: sht75.cpp

Revision:

1:20aa2d4a28bf

Parent:

0:f401474a3e96

Child:

2:dd218144f9fe

diff -r f401474a3e96 -r 20aa2d4a28bf sht75.cpp
--- a/sht75.cpp	Wed Oct 27 15:27:38 2010 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,180 +0,0 @@
-//
-// Ian Molesworth October 2010
-// SHT 75 class
-//
-// 
-// To do:
-//
-// 
-
-#include "sht75.h"
-
-void SHT75::reset()
-    {
-     _data.output();
-    _data = 1;                                        // data bus high
-    for (int i=0;i<12;i++)
-        {
-        _clock = 1;                                   // clock high
-        wait_us(1);
-        _clock = 0;                                   // clock lo
-        wait_us(1);
-        }
-    _clock = 1;                                   // clock high
-        wait_us(1);
-    _data  = 0;
-        wait_us(1);
-    _clock = 0;                                   // clock lo
-        wait_us(1);
-    _clock = 1;
-        wait_us(1);
-    _data  = 1;
-        wait_us(1);
-    _clock = 0;   
-        wait_us(1);
-    }
-
-void  SHT75::softReset(void)
-    {
-    _data.output();
-    start();
-    write(0x1E);
-    wait_ms(12);
-    }
-
-void  SHT75::start(void)
-    {
-    _data.output();
-    _clock = 1;
-    wait_us(1);
-    _data = 0;
-    wait_us(1);
-    _clock = 0;
-    wait_us(1);
-    _clock = 1;
-    wait_us(1);
-    _data = 1;
-    wait_us(1);
-    _clock = 0;
-    }
-
-int SHT75::readStatus(void)
-    {
-    int status;
-    status = -1;
-    start();
-    if (write(0x06) == 0)
-        status = read(1);               // read with a wait for ack
-    read(0);                            // read without the wait
-    return status;
-    }
-
-bool SHT75::write(char d)
-    {
-    auto int i;
-    _data.output();                         // bus output
-    // Writes char and returns -1 if no ACK was sent from remote
-    for (i=0;i<8;i++)
-        {
-        if (d & 0x80)
-            _data = 1;                      // data high
-        else
-            _data = 0;                      // data lo
-        // shift the data
-        d <<= 1;
-        wait_us(1);
-        _clock = 1;                         // clock high
-        wait_us(1);
-        _clock = 0;                         // clock lo
-        }
-    _data.input();                          // float the bus
-    wait_us(1);
-    _clock = 1;                             // clock high
-    wait_us(1);
-    i = _data;
-    _clock = 0;                             // clock lo
-    return i;                               // leave the bus in input mode and return the status of the ack bit read.
-    }
-
-int SHT75::read(char ack)
-    {
-    auto int i,s;
-    auto char c;
-    s = 0;
-    _data.input();                            // bus to input
-  
-    for (i=0;i<8;i++)
-        {
-        s <<= 1;
-        wait_us(1);
-        _clock = 1;                              // clock high
-        wait_us(1);
-        c = _data;                               // get the data bit
-        _clock = 0;                             // clock lo
-        if ( c )
-            s |= 1;
-        }
-
-    if (ack == 1)
-        _data = 0;                             // data lo
-    else
-        _data = 1;                             // data hi
-    _data.output();
-    _clock = 1;                                // clock lo
-    wait_us(1);
-    _clock = 0;                              // clock lo
-    _data = 1;                               // data hi
-    _data.input();
-    return s;
-    }
-
-
-// Put the current temperature into passed variable
-bool SHT75::readTempTicks(int* temp)
-{
-  int v, value;
-  start();                                  // Start a tx ( leaves data as input )
-  if (write(0x03) == 0)                     // send the read command and get an ack
-        {
-        for (v=0; v<50; v ++)               // wait for ready up to 500 ms
-            {
-            wait_ms(10);                    // 10 ms pause
-            if ( _data == 0 )               //
-                {
-                value = read(1);            // read a byte
-                value <<= 8;                // shift it in
-                value |= read(1);           // read another byte
-                read(0);
-                // transfer the value
-                 *temp = value;
-                reset();
-                return true;
-                }
-            }
-        }
-    return false;    
-    }
-
-bool SHT75::readHumidityTicks(int* humi)
-    {
-    start();
-    if (write(0x05) == 0)
-        {
-        for (int value=0; value<50; value ++)   // wait for ready up to 500 ms
-            {
-            wait_ms(10);                        //
-            if ( _data == 0 )                   //
-                {
-                value = read(1);
-                value <<= 8;
-                value |= read(1);
-                read(0);
-                *humi = value;                  // transfer the value
-                reset();
-                return true;
-                }
-            }
-        }
-   
-    return false;
-    }