UART0 RX0 doesn't work

[kaloyan]

Hello,
I use a USB-TTL PL2303HX converter for serial console on A20-Olinuxino-LIME-4G, rev. C

The UART RX0 pin is not working.
I have tested the converter RX/TX lines and their leds light up, only on the board TX pin.

Anyone having a simillar issue ?

[JohnS]

How exactly have you connected it?  How many pins & which?

Did you try looping its Tx to Rx?

John

[kaloyan]

I just found a thread saying PL2303 gives 5V output on the TX/RX lines.
I hope i didn't kill my board.

[kaloyan]

Is the USB serial calbe F, from olimex, based on the PL2303HX chip ?
This is the one I have

[dave-at-axon]

I just found a thread saying PL2303 gives 5V output on the TX/RX lines.
I hope i didn't kill my board.

If you connected the TX at 5V to the Olimex board with 3.3V input level and not 5V tolerant, then you may well have done damage.

[kaloyan]

I have measured my serial module, and it works at 3.3V.
Which means my board UART0 port is damaged (my own fault).

Anyone knows how to check what is damaged ?

[tandr]

I have the same problem. My cable does work with other boards wich are at voltage level 3.3V.
Tested 3 different boards of the A20-SOM (Revision B).


Can anyone check this?
BTW: TX works great