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Re: serial console on Pi Zero W
Many thanks for all the replies! I merged all my responses
into one. Didn't manage to get it to work yet.
Perhaps I'm going the hard way about this and there is a
simple way to get a serial console on the Pi Zero W USB
output instead of the GPIO UART pins?
From mouse%Rodents-Montreal.ORG@localhost Sun Aug 22 23:46:39 2021
> If you're an experienced serial-line hacker, what I'm about to say will
> be obvious to you, but it's not clear to me whether you are or not.
> Are you certain you don't need to swap Tx and Rx?
Not an experienced serial hacker but I do use it
occasionally. There is a tiny LED on the bridge that
lights up when I type on the laptop so I assume I got Tx
and Rx right. But to be sure I tried swapping them, which
made no difference.
From ckulesa%arizona.edu@localhost Sun Aug 22 23:51:49 2021
> To clarify, you are connecting to the TX, RX, and GND pins on the GPIO
Yes, to pins 6 (GND), 8 (UART TX), and 10 (UART RX) as per
here, to be exact:
> Is this particular cp2102 converter a "true" RS232 UART or is it
> TTL-level? The former won't work. If you've used this converter on
> another RPI, it should be OK.
Haven't used it on another RPi.
> I use this for RPI, but any converter where logic "high" is 3.3V and
> "low" is 0V should work.
Checked with a multimeter. Logic levels seem to be 3.3V
but active low. Does it need to be active high?
> Can you confirm the pin assighments? Is the converter RX connected to
> the PI on the TX pin? And the converter TX connected to the Pi's RX
> pin? If they're reversed, you won't see anything either.
Confirmed but reversing them also makes no difference.
From denis%ovsienko.info@localhost Mon Aug 23 00:12:59 2021
> It is not clear from the datasheets whether CP2102 operates its serial
> side at TTL voltage (3.3V) or not.
From a multimeter test it's 3.3V active low.
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