[SOLVED] SSM2603 right output offset issue

[SOLUTION]

Sooooo, I finally found the problem after month of struggle!

So it turned out that the problem came from the SSM, not from my code...

First, I finally identify that the problem only occur when I was configuring the SSM the first time after booting.

If I reconfigured it later, without powering down to the board (and the codec), it worked every time.

I validated this theory by calling the configuration function twice in a row: no more problems.

So after some empirical tests, I finally found the fault register: R06 (power management)

Unlike what is written on the datasheet:

"Enable all of the necessary power management bits of
Register R6 with the exception of the out bit (Bit D4)."

You have to leave the default values! (everything power down except OSC and CLKOUT bits).

Here is my code:

I haven't had any problems since. Tested on a dozen zybo (Z10 and Z20).

I don't know if I'm the only one who had this problem.

I hope it can help someone else and save you wasting as much time as me on this codec...

Hi MaxPof

Thanks for your solution !!
You are absolute correct! There is an error in the manual for SSM2603, about how to initiate the registers,
or a very very bad description!

I have been working with this problem on/off for about 3/4 year !
Sometimes the codec start up fine and other times not - where you get this "broken" sinus signal - and VMID ends up at 3.3 V not 1.65 Volt as excepted.

I follow your solution (almost) setting all power pin in reg. 6 to 1 - also setting Hole chip to "power down", (which is rather unlogic ally).
Making my settings to other registers,  - and then after the a times delay at about 100 msec power up the needed power parts of SSM2603.

Now it runs stable after every boot.

I think that Analog should review there description and send out a new SSM2603 datasheet.

Like you, I have also problems about reading the register values with I2C interface.
It always return 0x97 ?? But this is solved by using shadow registers instead. This also gives less traffic on the I2C line.

Again thanks for your solution - I am really thankful.

Hi MaxPof

Thanks for your solution !!
You are absolute correct! There is an error in the manual for SSM2603, about how to initiate the registers,
or a very very bad description!

I have been working with this problem on/off for about 3/4 year !
Sometimes the codec start up fine and other times not - where you get this "broken" sinus signal - and VMID ends up at 3.3 V not 1.65 Volt as excepted.

I follow your solution (almost) setting all power pin in reg. 6 to 1 - also setting Hole chip to "power down", (which is rather unlogic ally).
Making my settings to other registers,  - and then after the a times delay at about 100 msec power up the needed power parts of SSM2603.

Now it runs stable after every boot.

I think that Analog should review there description and send out a new SSM2603 datasheet.

Like you, I have also problems about reading the register values with I2C interface.
It always return 0x97 ?? But this is solved by using shadow registers instead. This also gives less traffic on the I2C line.

Again thanks for your solution - I am really thankful.