Have any AD5141 about Altera code(HDL or NIOS 2)for us reference now?
Please check your post because I think there was an error on your post on the forums.
Thanks of your reminder.
My understanding to your question is that you are asking for a reference code to control the AD5141 using Altera code (HDL or NIOS2). If my interpretation is correct, I am sorry to tell you that we do not have a reference code specifically for the AD5141 in Altera code. However, ADI offers reference codes of other digipots as seen in this page.
If you have any questions regarding the Altera code of other digipots, you may check or post on the FPGA Reference Design Support Community.
The list of project we have reference designs for Altera can be found at:
Altera Reference Designs [Analog Devices Wiki]
Not all are not actively maintained at this time (may use older versions of the Quartus tools), but you can use them as a starting point to develop your project.
In the list, I saw that AD5254 and AD5110 have an I2C interface so they may be a good starting point for you. The uc/Probe version used for the interface of those projects is no longer available, but with minor changes of the code you could use UART as inteface.
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