GPIO TX-RX, banks, colors

#1

1.On what pins can I use GPIO TX-RX?
2.Any TX-RX example, please.
3.How to use GPIO banks? https://wiki.radxa.com/Rock5/hardware/5b/gpio
4.What are blue pins 27, 28 ?

#2

Did you mean tx-rx of uart when you say tx-rx?

#3

I want to send and recive data to arduino (Wemos D1) with TX-RX

#4

that’s uart, such as uart7_m2 (pin 24 and pin 26)、uart3-m1 (pin 12 and pin 35)

#5

before using uart, you should config the pinmux by using rsetup. (rsetup->overlays->Manage overlays, then select overlay you wana use)

#6

My Armbian dont have /boot/extlinux/extlinux.conf
rsetup - command not found
I found uart settings in armbian-config. But how to use it?

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#7

Pinmux is the multiplexing function of a pin, for details see ROCK 5B GPIO Pinout. if your system image is relatively new, you can run rsetup to config pinmux, if not, you need modify /boot/extlinux/extlinux.conf.

#8

for pin 27 and pin 28, their functions are clearly marked on hardware pinout.

#9

Why are the pins blue compared to the others?

I am assuming
Red = 5V PWR
Yellow = 3.3V PWR
Black = GND
Blue = I2C?