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Parallella Community • View topic - PL RTC substitute

PL RTC substitute

Using Zynq Programmable Logic and Xilinx tools to create custom board configurations

PL RTC substitute

Postby zmc » Mon Sep 01, 2014 4:41 pm

I'm interested in creating a small timing circuit in the PL fabric to minimize clock drift in high load situations.
I know that a hardware RTC can be had cheaply, but this seems like a good project to start understanding how to implement custom circuits in the Parallella.

I have found a few VHDL examples of RTC like systems and it's very simple to implement, but what I have found has been making a counter, and then outputting the time data to a 7-segment LCD. In the Parallella this data would need to make its way into the Linux kernel.

I'm a complete novice with FPGA development and integration. For those of you with some experience with this, what is the best way for me to get that data into the rest of the system?
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Re: PL RTC substitute

Postby 9600 » Mon Sep 01, 2014 6:13 pm

As far as I know you would need to create a new AXI peripheral in the Zynq PL and a kernel driver. You might find this post and the subsequent replies useful:

viewtopic.php?f=10&t=1069&hilit=axi+project&start=20#p8733

Cheers,

Andrew
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