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Are there people know about TVP7000....

 
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soulweed



Joined: 20 Oct 2006
Posts: 23

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Are there people know about TVP7000....
PostPosted: Tue Apr 24, 2007 9:59 am     Reply with quote
Now i'm using my senior project and I don't know about how to config,I know only it must be config with I2C,I tried to do that but it don't work
,when i config i read in datasheet and go on it but it can't connect with PIC18F452 please tell me why it doesn't work
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Apr 24, 2007 12:23 pm     Reply with quote
Look on page 15 of the TVP7000 data sheet. It has two diagrams of
the i2c operations to write and read from the chip. It also tells you
the slave address of the chip.

To write a byte:
Code:
S  10111000  ACK  subaddress  ACK  send_data  ACK  P


To read a byte:
Code:

S 10111000 ACK subaddress ACK S 10111001 ACK receive_data NAK P


Then translate those diagrams to CCS code:
Code:

#define TVP7000_I2C_WRITE_ADDR 0xB8
#define TVP7000_I2C_READ_ADDR  0xB9

void TVP7000_i2c_write(int8 reg, int8 data)
{
i2c_start();
i2c_write(TVP7000_I2C_WRITE_ADDR);
i2c_write(reg);
i2c_write(data);
i2c_stop();
}

//-------------------------------------
int8 TVP7000_i2c_read(int8 reg)
{
int8 retval;

i2c_start();
i2c_write(TVP7000_I2C_WRITE_ADDR);
i2c_write(reg);
i2c_start();
i2c_write(TVP7000_I2C_READ_ADDR);
retval = i2c_read(0);
i2c_stop();

return(retval);
}
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