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TEA5767 basic program

 
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Skirmitt



Joined: 19 May 2009
Posts: 60

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TEA5767 basic program
PostPosted: Thu Dec 01, 2011 9:16 am     Reply with quote

I received a TEA5767 module today. This is a FM Radio chip that communicates through i2c. First I want to make a basic program that works to test the module itself. I have pullups 4K7 on the SDA and SCL lines. I don't get anything out of it.

Datasheet: http://www.sparkfun.com/datasheets/Wireless/General/TEA5767.pdf

Code:

#include <16F886.h>
#fuses INTRC_IO, NOWDT, BROWNOUT, PUT, NOLVP
#use delay(clock=4000000)
#define DAL_SCL PIN_C3
#define DAL_SDA PIN_C4
#use i2c(master, slow, sda=DAL_SDA, scl=DAL_SCL)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)

unsigned char frequencyH=0;
unsigned char frequencyL=0;
unsigned int frequencyB;
double frequency=0;

void main()
{

delay_ms(2000);

frequency=91.3; //starting frequency
frequencyB=4*(frequency*1000000+225000)/32768; //calculating PLL word
frequencyH=frequencyB>>8;
frequencyL=frequencyB&0XFF;

i2c_start();
i2c_write(0x60); //adres om te schrijven
i2c_write(frequencyH);
i2c_write(frequencyL);
i2c_write(0xB0);
i2c_write(0x10);
i2c_write(0x00);
i2c_stop();

}


Has anyone something that does work or am I doing something very wrong here ?
Ttelmah



Joined: 11 Mar 2010
Posts: 17330

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PostPosted: Thu Dec 01, 2011 10:11 am     Reply with quote

Double check the I2C address. It is _not_ 0x60.
Historically, I2C, has a _seven bit_ address, left shifted by one, with the R/W bit below this. Microchip, together with a lot of other manufacturers give the 8bit value that results. However if you look at the data sheet for this device, the address is given as a 7bit value. So the 'PIC format' address for this device, is 0xC0 for write, and 0xC1 for read. Look at table4 in the data sheet, which shows this.
Comments:
The PIC16 chips, don't have a double data type. Does nothing, same as float...
FrequencyB is an 8bit value (remember an INT in CCS is 8bit). Shift this right 8bits, and you have nothing.... FrequencyB _needs_ to be declared as an int16.

Best Wishes
Skirmitt



Joined: 19 May 2009
Posts: 60

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PostPosted: Thu Dec 01, 2011 10:26 am     Reply with quote

Just found that out, I based the code on an Arduino sample I found.

This works great now:

Code:

frequency=102.1*1000000; //starting frequency
frequencyB=(4*(frequency+225000))/32768; //calculating PLL word
frequencyH=frequencyB>>8;
frequencyL=frequencyB&0XFF;

i2c_start();
i2c_write(0xC0); //adres om te schrijven
i2c_write(frequencyH);
i2c_write(frequencyL);
i2c_write(0xB0);
i2c_write(0x10);
i2c_write(0x00);
i2c_stop();
Skirmitt



Joined: 19 May 2009
Posts: 60

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PostPosted: Fri Dec 02, 2011 1:59 am     Reply with quote

Oh and thanks for letting me this know:

Quote:
The PIC16 chips, don't have a double data type. Does nothing, same as float...


I didn't know that !
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