SSM I2C issue

Question

Hi all... 
 Good day, 
 We are working on communication system using AD9361 with xc7z030. 
 So I'm working with a xc7z030, vivado version 2021.1, and Vitis for Software. 
 I2C signals read back from audio amplifier(SSM2380) is not giving the expected register values. The read-back register values are always constant 0xFF. 
 Write is working and during read amplifier is acknowledging address but data is wrong. 
 a. VIVADO 2021.1 Screenshot for the Writing_0_to_Reg5.

b. VIVADO 2021.1 Screenshot for the Reading_from_Reg5. 
 
 Kindly refer the attached picture.

Any help would be very appreciated, since I need to progress on my work.

DaveThib · Answer

Hello Analog404, 
 
 Thanks for the screenshots. It was a little bit of work to decode but I think I see what is going on. 
 For the Read sequence. You are sending the Start then the device address with bit A0 set to {write) and then the address. This part is all correct. (Actually I have one comment later about the address) 
 Then you send a repeated start with the device address but you have bit A0 low which is a write command. But A0 needs to be a "1" to set the interface to read the data from the address you just wrote before the repeated start. I think that is where you are going wrong.

Here is how it is defined in the datsheet:

Regarding the address. It looks like you are sending three bytes for the address. The device only uses one byte for the register address. 
 
 Dave T

Analog404 · Answer

Hi sir... 
 Thank for your reply.. 
 In software we have monitored I2C signals. Down below is attached file. 
 kindly have a look at this link: 
 https://photos.app.goo.gl/qsa93a1gQBCrdSDVA 
 
 Awaiting your reply...

Analog404 · Answer

Hi sir... 
 In software we have monitored I2C signals. Down below is attached file. 
 Kindly have a look sir.

Awaiting your reply... 
 Thank you...

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SSM I2C issue