de2 115 board audio codec i2c address

Altera_Forum · ‎05-01-2013

hello everyone,

im trying to access audio codec and i faced a problem. what is the slave address of this audio codec?

i looked into the demostration files for getting an idea about i2c bus. i saw these lines:

//=========start===========

6'd1 : begin

SD = I2C_DATA;

SDO = 0;

end

6'd2 : SCLK = 0;

//======SLAVE ADDR=========

6'd3 : SDO = SD[23];

6'd4 : SDO = SD[22];

6'd5 : SDO = SD[21];

6'd6 : SDO = SD[20];

6'd7 : SDO = SD[19];

6'd8 : SDO = SD[18];

6'd9 : SDO = SD[17];

6'd10 : SDO = SD[16];

6'd11 : SDO = 1'b1;//ACK

//========SUB ADDR==========

6'd12 : begin

SDO = SD[15];

ACK1 = I2C_SDAT;

6'd13 : SDO = SD[14];

6'd14 : SDO = SD[13];

6'd15 : SDO = SD[12];

6'd16 : SDO = SD[11];

6'd17 : SDO = SD[10];

6'd18 : SDO = SD[9];

6'd19 : SDO = SD[8];

going so far..

etc. but, i couldn't understand difference between sub addr and slave addr.

the sub address may be register address. but, what should be slave address?

i need your help

thanks,

can

Altera_Forum · ‎09-12-2013

Hi can,

I need to implement ADC using Codec on DE2-115 board. Can you help me out with some example.

thanks,

vrv

Altera_Forum · ‎09-12-2013

can't you get the device address from the datasheet of the audio codec WM8731 ?

Altera_Forum · ‎10-07-2013

Hello canokcelik,

I'm studying the audio codec and if you take a look in another part of this code (clock_500.v block) you will observe that this address is fixed:

wire [23:0]DATA={8'h34,DATA_A};

I dont know what 34h means, I just know that is the slave address. 35h means another address, but I forgot what it means... =/

Sub address is the address of the registers, as you said, for example:

ROM[0] = 16'h0c00; //power down => (0000 110)(0 0000 0000) it means register 6 (R6), take a look in the datasheet.

sub_addr binary settings

ROM[1] = 16'h0ec2; //master => (0000 111)(0 1100 0010) it means register 7 (R7)

I hope I have helped you and sorry for the bad english.

Altera_Forum · ‎11-17-2013

Hello everyone, sorry for delay.

i have solved the problem. The slave address is 0x34, as viniciuslagrota indicated in his reply.

viniciuslagrota: h prefix in h34 means that following number's radix is hexadecimal. so it is converted to "00011010" in your example because of 8'h34(In here, 8 indicates that following number must has 8 bits). you can send me an email about what you are doing now. may be, i can help you about somethink.