Adding rs232refcomp to Microblaze

[Zorroslade000]

I am new to fpgas and Vivado.  I am using the Arty A7-35T.

I would like to do is connect a UART to the JA. I am trying to follow this example (https://reference.digilentinc.com/reference/pmod/pmodrs232/start)  I have added the "X-Board VHDL Example", and it adds Rs232RefComp.  I don't know how to connect the RxD and TxD to the pmod connector. Also, an explanation on how to use this would be helpful.

Rob

[jpeyron]

Hi @Zorroslade000,

Welcome to the Digilent Forums!

Are you using the Pmod 232 on JA or a different IC?

Please be more specific on what your project is trying to do. 

Here is the resource center for the Arty-A7-35T. 

The GPIO demo for the Arty-A7-35T here uses the usb uart bridge and communicates to the PC through a serial terminal.

best regards,

Jon

[Zorroslade000]

Hi, Thx for the response.

I do have the usb-lite from the https://reference.digilentinc.com/vivado/getting-started-with-ipi/start connected (for debug). I want to add more uarts as communication buses.  Currently, i don't want to use the pmod module.  I just want the rs232 signals at the JA connector (it can be any of the JX connectors).

Rob

[jpeyron]

Hi @Zorroslade000,

On step 4.8 of the Getting Started with the Vivado IP Integrator

1)  In the Vivado block design add an additional uart lite ip core by clicking on the plus sign.

2) right click on the uart port on the uart lite and click on "make external"

continue with the tutorial until step 5.2.

1) Add a constraint file by copying the Arty-A7-35T master XDC from ther XDC here.

2) Open the wrapper and find the signal names used for the uart rx and tx .

3) In the xdc alter the signal name of the pin/pmod port you would like to use.

4) un-comment the pins 

continue with the tutorial and generate a bitstream.

Once you have launched SDK you will need to make your own code main.c.  Look at the examples at the path here(for Vivado/SDK 2018.3 the path is below):

C:\Xilinx\SDK\2018.3\data\embeddedsw\XilinxProcessorIPLib\drivers\uartlite_v3_2\examples

best regards,

Jon

[Zorroslade000]

Thx,

That seems to work. Also, now I know where the examples are.

Rob

[jpeyron]

Hi @Zorroslade000,

Glad to hear that this worked for you.

best regards,

Jon