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TC74

 
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Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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TC74
PostPosted: Mon Mar 15, 2004 4:12 pm     Reply with quote
I spent a morning remembering how to use I2C. I had trouble finding any code example for the TC74 on the PICDEM2+ dev board. The killer was not readings the data sheet reguarding the address. Then I had to adjust for the signed byte.
Code:

/**********************************************************/
/*             Read Temp TC74 on PICDEM2+                 */
/**********************************************************/
void Read_Temperature(void)
{  int16 Temperature;
   if(Get_Temp)
   {  Get_Temp=0;
      i2c_Start();                                          // Set a START condition I2C Bus
      i2c_Write(0b10011010);                                // Address and Write Flag
      i2c_Write(0x00);                                      // Temperature Register
      i2c_Start();                                          // Set a START condition I2C Bus
      i2c_Write(0b10011011);                                // Address and Read Flag
      Temperature = i2c_Read();                             // Read Teperature
      i2c_stop();

      if(Temperature>=128)
      {  Temperature+=0xFF00;                               // Fill upper byte
      }
      Temperature+=273;                                     // Make it a kelvin reading
   }
}
wedilo



Joined: 16 Sep 2003
Posts: 71
Location: Moers, Germany

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PostPosted: Tue Mar 16, 2004 2:12 am     Reply with quote
Hello Neutone,
Unbelievable, you give the answer before I can ask the question. Go on!!! Very Happy

73 Sven
tag-eng



Joined: 28 Jul 2004
Posts: 6

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PostPosted: Wed Jul 28, 2004 11:44 am     Reply with quote
neutone (or anyone),

thanks for the code. we were wondering how you got this to print out? also, the headers and things that are used with the i2c. so basicly what i am looking for is a way to output the data gathered here and everything necessary to make this run properly.

thanks
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