Developing an SPI Controller for Zedboard OLED Display 

Thank you..

I will have on Ethernet and Pcie. But not on Zedboard. May be vc707 or vc709

Will try

Of course. You can just instatntiate two SPI controllers in a top file and during pin assignment, assign the pins where the two peripherals are connected. If you don't want to send data to the devices at the same time, one SPI controller is enough. It can have 2 slave select signals which can be controlled depending on to which peripheral you want to send data to.

@@TheVipinkmenon Dear professor, as far as I know, Zynq can address only 1 SPI master at a time (we can only use SPI bus at one time). However, even I've tried with Zynq Ultrascale, but I could not get the good result (there is a different timing between two of SPI). Is there another solution?

If processor/software is controlling the SPI master, yes there will be slight delay between the starting of the two controller since software runs sequentially and it can configure the second controller only after configuring the first controller. If you want the controllers to start exactly at same time (like both asserting slave select on exactly same clock cycle), you will need some hardware to manage that in between. That means you cannot use the SPI controllers in PS and will have to implement them in PL. If you have using custom SPI controller (like the one I have written), you can easily do that. There can be a common control register for both controllers and software can write to that single register to start operation and both will start at the same time. If you will use Xilinx SPI IP core, you will need your custom hardware between processor and the SPI controllers. Software writes to your IP and it then controls the SPI controllers, which can happen in parallel.

The input clock runs at 100 MHz and the SPI needs a 10 MHz clock. If you create a new clock based on another's positive edge it will be half the speed because you're only switching the new clock once a cycle. So that would give us a 50 MHz clock. To get the 50 MHz down to 10 we want to switch it every fifth time. The counter starts at 0 so to switch on the fifth time we have the counter go up to 4: count 0 to 4. It's tough to explain without a visual aid. Try comparing what I typed to his waveforms in the video. Let me know if I can clarify anything...

Yes PS has an SPI and you can connect it to OLED through the EMIO interface.

@@TheVipinkmenon, thank you. I just found out the hard way why we want to develop our own hard-coded SPI driver like this one: the Cmod-A7 does not have an SPI port (Microblaze). But I really need that SPI port on one, so this video just became one of my very favorites? I tried using the built-in QuadSPI, but you can't just pull one SPI port out it very easily. Maybe that is possible, but this method making our own SPI driver is more fundamental. Thanks for helping to open doors!

I have added the link in the description

cdn-shop.adafruit.com/datasheets/UG-2832HSWEG04.pdf cdn-shop.adafruit.com/datasheets/SSD1306.pdf

@@TheVipinkmenon Thank you but I want of zedboard document also

Just search in Google dear. Zedboard hardware user guide

@@TheVipinkmenon ok bro tq How can I contact you personally?

My email is in channel description

Thank you for the suggestion. I will check it.