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Explorer
Explorer
1,398 Views
Registered: ‎11-23-2017

UART not woring

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I have an AC701 with an unsupported device, which means I don't have a board file and I'm defining IO pins manually.

I have so far failed to get the UART to communicate. Going through the standrad board schematics, I see there are two extra USB ports which I am not defining when using AXI UARTlite: USB_UART_RTS and USB_UART_CTS.

Is this why it is not working? How do I define them?

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1 Solution

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Moderator
Moderator
1,875 Views
Registered: ‎11-09-2015

Re: UART not woring

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Hi @simchask,

 

I don't know what to tell you more. You have an unsupported board... We cannot know what is the pinout...


Florent
Product Application Engineer - Xilinx Technical Support EMEA
**~ Don't forget to reply, give kudos, and accept as solution.~**
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6 Replies
Explorer
Explorer
1,381 Views
Registered: ‎11-23-2017

Re: UART not woring

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I finally got the microblaze to run a program that blinks the GPIO LEDs. So I know that at least some of the XC7A100T pins on the AC701 board match the XC7A200T. S: the differential clock, the CPU reset, and the LEDS.

So why can't I get any love from the UART?

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Moderator
Moderator
1,345 Views
Registered: ‎11-09-2015

Re: UART not woring

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Hi @simchask,

 

Can you see the UART port as COM port in your machine? Are you using tera term as recommended?


Florent
Product Application Engineer - Xilinx Technical Support EMEA
**~ Don't forget to reply, give kudos, and accept as solution.~**
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Explorer
Explorer
1,337 Views
Registered: ‎11-23-2017

Re: UART not woring

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I can see the UART port. I am now trying with putty. Tera Term was flagged as a virus by my anti-virus.

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Explorer
Explorer
1,330 Views
Registered: ‎11-23-2017

Re: UART not woring

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Still nothing. I am now convinced the pads are different than the AC701 with XC7A200.

I am lost.

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Moderator
Moderator
1,876 Views
Registered: ‎11-09-2015

Re: UART not woring

Jump to solution

Hi @simchask,

 

I don't know what to tell you more. You have an unsupported board... We cannot know what is the pinout...


Florent
Product Application Engineer - Xilinx Technical Support EMEA
**~ Don't forget to reply, give kudos, and accept as solution.~**
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488 Views
Registered: ‎08-14-2018

Re: UART not woring

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I had exactly the same problem. The reason is... mistakenly swapped RX and TX lines in schematics.

Try to set pins as following:

set_property PACKAGE_PIN T19 [get_ports uart_rx]
set_property PACKAGE_PIN U19 [get_ports uart_tx]

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