Mapping a basic UART project to the HPS_UART pins

Question

Hi,I am currently working working on a project for a class that I am TAing and was asked to add the ability to send and receive data between the DE1-SoC board and a host computer. I have built a project following this video here:https://www.youtube.com/watch?v=fMmcSpgOtJ4but when I set up the pin assignments for the HPS_UART_RX and HPS_UART_TX pins I get the following errors:Error (14566): The Fitter cannot place 2 periphery component(s) due to conflicts with existing constraints (2 pin(s)). Fix the errors described in the submessages, and then rerun the Fitter. The Intel FPGA Knowledge Database may also contain articles with information on how to resolve this periphery placement failure. Review the errors and then visit the Knowledge Database at https://www.altera.com/support/support-resources/knowledge-base/search.html and search for this specific error message number.Error (175020): The Fitter cannot place logic pin in region (79, 81) to (79, 81), to which it is constrained, because there are no valid locations in the region for logic of this type.Info (14596): Information about the failing component(s):Info (175028): The pin name(s): UART_TXDError (16234): No legal location could be found out of 1 considered location(s). Reasons why each location could not be used are summarized below:Error (184016): There were not enough single-ended output pin locations available (1 location affected)Info (175029): C25Info (175015): The I/O pad UART_TXD is constrained to the location PIN_C25 due to: User Location Constraints (PIN_C25)Info (14709): The constrained I/O pad is contained within this pinand the same for UART_RXD on PIN_B25any help on how to resolve this issue would be appreciatedCheers

sstrell · Answer

Can you show your settings in the HPS IP Parameter Editor and Pin Planner?  The HPS has to be set up to use those pins for a function like UART.

juiceg · Answer

Hey sstrell,Sorry but I am a new to implementing this kind of thing, I did not set up an HPS ip core.when looking at the hard processor components, how do I know which one I need to use?Also the ip cores have significantly more inputs than I was expecting, is there a good tutorial video or any documentation I can reference to get this set up?Cheers

sstrell · Answer

If you are not using the HPS, then the problem is most likely that you've selected pins that are dedicated to the HPS so you would need to use the HPS to access the HPS's UART peripheral and that means implementing it in Platform Designer.  If you are not going to use the HPS, you'll need to create a UART design in the FPGA fabric and select unused (but accessible on the dev kit) pins to connect it to.

juiceg · Answer

I see, thank you.I am currently using pins dedicated to the hps although the plan is to not use the hps.I do not have anything to connect the DE1 board to a pc using the external pins but I have access to a DE2 board. Do you know if the DB9 port goes through hps?Cheers

mabdrahi · Answer

Hi Justin,I will go thorough your query and will back soonMay i have your design reference like rocketboard link?Thank you,

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Mapping a basic UART project to the HPS_UART pins

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