I connect I2C signal between Arduino and TI DSP IC and I need to write some data to the TI DSP register.
But there have 2 pages: page0 and page1.
How can I choose page_0 or page_1 and write the data to register1, register2 ....... register(xx)?
thanks.
Well to start it, it would probably help to tell us which DSP IC you're using.
Which Arduino board do you use ?
When you use an Arduino Uno, then you have a 5V I2C bus.
The interface of the TAS3251 runs at 3.3V, so it has a 3.3V I2C bus.
The maximum voltage on the SDA and SCL pins of the TAS3251 is VDAC_DVDD + 0.5, that is 3.8V.
The first thing to do is to run a I2C Scanner sketch, to check if the I2C bus is working.
The I2C of the TAS3251 works just as any other normal I2C device. For writing, first the 8-bit register-address is written, then one or more data bytes. For reading, the register-address is written, then a repeated start and then the databytes are read.
Hello Koepel,
I can found 3x I2C address
Scanning...
I2C device found at address 0x4B ! (TAS3251)
I2C device found at address 0x65 ! (XMOS)
I2C device found at address 0x70 ! (SRC)
done
After I changed the TAS3251 I2C address setting, I2C changed from 4B to 4A
I think I2C syntax might be :
but I don't know how to select register page(x)
thanks,
The "I2C_WRITE" is not Arduino code with the Arduino Wire library. Can you show your sketch ?
Koepel:
The "I2C_WRITE" is not Arduino code with the Arduino Wire library. Can you show your sketch ?
Hello Koepel,
I have seen how to switch book, page and register, please refer to attached.
But I'm not quite familiar with I2C.
Here is an example, is it correct
Wire.beginTransmission(4B); // TAS3251 I2C address
Wire.write(0x00); // goto page0
Wire.write(0x7f); // goto resister 0x7f (page0)
Wire.write(0x8C); // Write 0x8C to 0x7f register (slesect 0x8C book)
Wire.write(0x30); // Select 0x30 register address in book 0x8C
Wire.write(0x00); // Write 0x00h data to 0x30 register
Wire.endTransmission( );
It feels messy, hope you know what I want to say
thanks.
First the register-address is written, then the data bytes. The first byte with "Wire.write()" is always the register address.
You can also not concatenate more than one command.
I don't know if this is right, but it should look more like this:
// Go to page 0
Wire.beginTransmission( 0x4B); // TAS3251 I2C address
Wire.write( 0x00); // register address 0
Wire.write( 0x00); // select page 0
Wire.endTransmission( );
// Change the book to 0x8C
Wire.beginTransmission( 0x4B); // TAS3251 I2C address
Wire.write( 0x7F); // register address 0x7F
Wire.write( 0x8C); // select 0x8C book
Wire.endTransmission( );
// Write 0x00 to register address 0x30
Wire.beginTransmission( 0x4B); // TAS3251 I2C address
Wire.write( 0x30); // register address 0x30 (in book 0x8C)
Wire.write( 0x00); // data 0x00 (to 0x30 register)
Wire.endTransmission( );
Should the page be set, after the book 0x8C is selected ?
When a I2C Scanner finds a device, then the next step is to read an identifier from the chip.
Register 0x58 has device ID of 0x84.
Wire.beginTransmission( 0x4B);
Wire.write( 0x58); // register address 0x58 is DIEI (chip ID)
Wire.endTransmission( false); // false for a repeated start
Wire.requestFrom( 0x4B, 1); // request 1 byte
int id = Wire.read();
Serial.print( "ID = 0x");
Serial.println( id, HEX);
I don't know if register 0x58 can be selected just like that, or should first a book and a page be selected ?
What about the difference in voltage levels on the I2C bus ?
Hello Koepel,
The I2C voltage level is +5V.
I will test your suggested I2C function.
thank you.
Koepel:
The interface of the TAS3251 runs at 3.3V, so it has a 3.3V I2C bus.
The maximum voltage on the SDA and SCL pins of the TAS3251 is VDAC_DVDD + 0.5, that is 3.8V.
