Enable UART2. Or use UART0

Radek

As the UART0 seems to be occupied by the operating system I tried to enable UART2 and followed this post but it just doesn't works for me.

Is there anything I might be missing?

Regards,
Radek

György Farkas

@Radek said in Enable UART2. Or use UART0:

I tried to enable UART2 and followed this post but it just doesn't works for me.

What did you do/try?

Radek

I executed this command:

@György-Farkas said in enable uart2 is posiible on Omega2+??:

After this command omega2-ctrl gpiomux set spi_s pwm01_uart2 Omega2(+)'s UART2 (ttyS2) works well using GPIO16 as TX2 and GPIO17 as RX2 (8N1 default BAUD rate 9600 bps).

# Omega2+ FW v0.2.2 b201

root@Omega-5BE1:~# omega2-ctrl gpiomux set spi_s pwm01_uart2
set gpiomux spi_s -> pwm01_uart2

root@Omega-5BE1:~# omega2-ctrl gpiomux get
Group i2c - [i2c] gpio 
Group uart0 - [uart] gpio 
Group uart1 - [uart] gpio pwm01 
Group uart2 - [uart] gpio pwm23 
Group pwm0 - pwm [gpio] 
Group pwm1 - pwm [gpio] 
Group refclk - refclk [gpio] 
Group spi_s - spi_s gpio [pwm01_uart2] 
Group spi_cs1 - [spi_cs1] gpio refclk 
Group i2s - i2s [gpio] pcm 
Group ephy - [ephy] gpio 
Group wled - wled [gpio]

Regards,
Radek

György Farkas

@Radek What was your next step?

Radek

Connected A9G modem to it and tried to communicate with it. As it didn't worked connected it to a USB/TTL adapter and tried to establish connection between my Mac and Omega2

CAP 33

@Radek Try to do as it is written here: https://docs.onion.io/omega2-docs/uart1.html. Only instead of /dev/ttyS1 write /dev/ ttyS2

György Farkas

@Radek
Proof of Concept (unfortunately I don't have an A9G board)

Serial communucation between

a desktop PC Ubuntu 18.04.4 LTS with an FTDI232 USB-to-Serial module
communication program: picocom -b 9600 /dev/ttyUSB0 (or picocom -b 115200 /dev/ttyUSB0 - 115200 on both device of course)
and an Omega2+ FW v0.3.2 b240 UART2 (/dev/ttyS2)

root@Omega-5BE1:~# omega2-ctrl gpiomux set spi_s pwm01_uart2
set gpiomux spi_s -> pwm01_uart2

root@Omega-5BE1:~# omega2-ctrl gpiomux get
Group i2c - [i2c] gpio 
Group uart0 - [uart] gpio 
Group uart1 - [uart] gpio pwm01 
Group uart2 - [uart] gpio pwm23 
Group pwm0 - pwm [gpio] 
Group pwm1 - pwm [gpio] 
Group refclk - refclk [gpio] 
Group spi_s - spi_s gpio [pwm01_uart2] 
Group spi_cs1 - [spi_cs1] gpio refclk
Group i2s - i2s [gpio] pcm 
Group ephy - [ephy] gpio 
Group wled - wled [gpio]

communication program: picocom -b 9600 /dev/ttyS2 (or picocom -b 115200 /dev/ttyS2 - 115200 on both device of course)

HW connections: FTDI RX to Omega2 GPIO16 (TX2), FTDI TX to Omega2 GPIO17 (RX2), GND to GND

It seems this serial communication is working well.

Radek

@György-Farkas said in Enable UART2. Or use UART0:

picocom -b 9600 /dev/ttyS2

Ok, I followed your advice and it seems to be working. At least between my Mac and Omega.
I am not getting why I cannot communicate with the A9G from Omega when it works from my Mac.

It's weird

Regards,
Radek

György Farkas

@Radek How do you use the A9G board with Omega2's UART1 (/dev/ttyS1)? Is that config working well?

Radek

Nope. It doesn't work with ttyS1 either. This is really weird.

György Farkas

@Marko-Lukat said in How can I pass one GPIO pin to an other?:

@Radek

Pin 16 and 17 (UART2) is connected AT_RX and AT_TX respectively. The UART2 doesn't work by the way.

Let's take a step back. Just short pin 16/17 (jumper wire), start a terminal of your choice on /dev/ttyS2 (on the Omega), disable local echo and start typing. Do you see any response (i.e. remote echo)?

root@Omega-5BE1:~# picocom -b 9600 /dev/ttyS2
picocom v1.7

port is        : /dev/ttyS2
flowcontrol    : none
baudrate is    : 9600
parity is      : none
databits are   : 8
escape is      : C-a
local echo is  : no
noinit is      : no
noreset is     : no
nolock is      : no
send_cmd is    : sz -vv
receive_cmd is : rz -vv
imap is        : 
omap is        : 
emap is        : crcrlf,delbs,

Terminal ready
Yes, when I short GPIO16 and GPIO17 (UART2) with a jumper wire then I can see what I type... :-)