TC74 interfacing problem with PIC18

• Dec 19, 2012

• #21

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Code:

IdleI2C(); // ensure module is idle 
        StartI2C(); // initiate START condition

Where does this 2 come from? do i need to declare?

 

• Dec 19, 2012

• #22

bigdogguru

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The I2C routines are contained in the i2c.c and i2c.h files.

Note the following compiler directive:

Code:

#include <i2c.h>

BigDog

 

• Dec 19, 2012

• #23

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those with I2c are included in the header file

Code:

#include i2c.h

 

• Dec 19, 2012

• #24

bigdogguru

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InNeedOfHelp said:

those with I2c are included in the header file

Code:

#include i2c.h

Click to expand...

Yes that is correct, they are contained in the i2c.h header and i2c.c source files.

 

• Dec 19, 2012

• #25

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sorry but what is SSPADD,SSPCON SSPSTAT?

 

• Dec 19, 2012

• #26

jayanth.devarayanadurga

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Check the datasheet. They are registers.

 

• Dec 19, 2012

• #27

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do u have the links?

 

• Dec 19, 2012

• #28

jayanth.devarayanadurga

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Google for "PIC18FXXXX Datasheet". XXXX should be replaced by the equivalent number.

 

• Dec 20, 2012

• #29

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what do they do actually ?

and what does the following code mean?

Code:

TRIS A = 0XFF;
TRISB = 0X01;
TRISC=0XBB;
TRISD=0X00;
TRISE=0XFF;

LATA =0X00;
LATB=0X00;
LATC=0X80;

- - - Updated - - -

TRISA** correction

 

• Jan 9, 2013

• #30

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hi i need to initialize my i2c , is this the correct file to use ?

Please reply asap

 

Attachments

• i2c.zip

  9.2 KB · Views: 58

• Jan 9, 2013

• #31

Jestin_cubetech

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Code:

#define		TC74_READ	   0x9B
#define		TC74_WRITE	   0x9A   

//////////////////////////////////////////////////////////////
void tc74_write(unsigned char reg,unsigned char val)
{
i2c_start(); 
i2c_write(TC74_WRITE);    
i2c_write(reg);  
i2c_write(val); 
i2c_stop(); 
}  
//////////////////////////////////////////////////////////////
void tc74_read(unsigned char reg,unsigned char *value)
{
i2c_start();
i2c_write(TC74_WRITE);
i2c_write(reg); 
i2c_repStart();
i2c_write(TC74_READ);
*value=i2c_read(0);  //ACK 
i2c_stop();   
}

START|TC74_WRITE|ACK|reg|ACK|repstart|TC74_READ|AC K|read data|NACK|STOP

 

• Jan 9, 2013

• #32

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i dont understand what u mean

 

• Jan 9, 2013

• #33

Jestin_cubetech

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steps for interface a TC74 sensor

 

• Jan 10, 2013

• #34

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this includes the header files of i2c??

 

• Jan 10, 2013

• #35

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@Jestin,,

in the stimulation software , what is the ic chip that u used ?

- - - Updated - - -

PHP:

START|TC74_WRITE|ACK|reg|ACK|repstart|TC74_READ|AC K|read data|NACK|STOP

what does this mean ?

 

• Jan 10, 2013

• #36

Jestin_cubetech

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chip 16f877A

START|TC74_WRITE|ACK|reg|ACK|repstart|TC74_READ|ACK|read data|NACK|STOP

i2c command sequence for access TC74
START= i2c start command
TC74_WRITE = TC74 device address [in this case 0x9A]
ACK=Acknowledgement
repstart = Repeat start i2c command
TC74_READ=TC74 device address|0x1 read command [in this case 0x9B]
read data = read SSPBUF register
NACK = I2C command negative acknowledgement
STOP= I2C command [stop i2c communication ]

 

• Jan 11, 2013

• #37

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will there be a difference in the code if i use 18F4520

 

• Jan 11, 2013

• #38

jayanth.devarayanadurga

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No. I2C routine is the same for all microcontrollers.

 

• Jan 11, 2013

• #39

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does that mean i can use Jestin's codes in initialize the I2C ?
any recommended links for initialization of TC74 ?