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theUltimateSource

RX / TX LED are swapped on the Zybo

Question

I know that RX / TX lines for UART connection are going to be swapped at one end or another.

zybo_led_uart.thumb.png.be0d5386a1e904fcfba024deb4976d2e.png

but why do you swap them for the status LED that are showing activity? When the Zybo board is sending a message the RX LED lights up?

Edited by theUltimateSource
fix image file extension

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I get your frustration but also feel a bit of sympathy with the folks at Digilent. The confusion is a grandchild of the RS-232 specification back when UART usually implied RS-232. This peer to peer interface had DCE or DTE ends, connector genders and connectors with different numbers of pins.... what a mess! Using a UART was as much fun as a snowy two lane country road where there are only 3 ( the middle one being shared by traffic going both directions ) bare strips for your tires amid the ice and snow.I still have nightmares about not being able to do something because I can't find a $%#^% gender or DB-9 to DB25 changer...

At least I have to congratulate Digilent on being consistent and providing a clue in the signal names as to what you need to look out for when using an external UART.

So which kind of device is the Zybo? I could argue for either one...

Edited by zygot

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Hi @theUltimateSource,

These hardware processes are based an the view from the PC. That the PC's TX and or the PC's RX lines are being used. I will pass on your observation to our content team to see if there is a better way to convey this information.

thank you,

Jon

 

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