No serial out for CAT using Rpi-5 and piHPSDR

[Dan Habecker]

I had this working fine with using a Rpi-4 and decided to upgrade to a Rpi-5.

I have the serial port turned on and /ttyAMA0 enabled.  I'm connected to the same GPIO as the Rpi-4.  When I enable the serial port I see the CAT on the screen go from gray to yellow.  But, no output on an oscilliscope, just a fixed high level.

Anything I'm missing?

73,

Dan W9EQ

[pa3gsb]

Dan,

I think you should use ttyAMA0  as device.

When you start the pihpsdr from the command and you select Enable CAt/TCI debug logging what does the output tell you?

  71.517 launch_serial_rigctl:  Port /dev/ttyACM0
    71.517 RIGCTL (open serial):: No such file or directory
    71.517 disable_serial_rigctl: Close Serial Port /dev/ttyACM0
    71.517 serial_enable_cb: Serial enable : ID=0 Enabled=0
    71.517 serial_enable_cb: Serial enable : ID=0 Enabled=0
   995.504 launch_serial_rigctl:  Port /dev/ttyAMA0
   995.504 launch_serial_rigctl: serial port fd=0
   995.504 launch_serial_rigctl: Speed (baud rate code)=12
   995.504 serial_enable_cb: Serial enable : ID=0 Enabled=1

Hope this helps

73 Johan

PA3GSB

Op donderdag 8 januari 2026 om 22:29:39 UTC+1 schreef dan.ha...@gmail.com:

[SNAIL]

Johan where and how to look on this debug output? I have problem with CAT command and can't figure out what is wrong.

[pa3gsb]

Hi, Starting pihpsdr in a command window like ./pihpsdr or sudo ./pihpsdr   and after clicking on CAT/TCI you select  Enable CAt/TCI debug logging  

Hope this helps

73 Johan

PA3GSB

Op zondag 11 januari 2026 om 22:50:28 UTC+1 schreef snailex...@gmail.com:

[Dan Habecker]

Johan,

Here's what I see as a result of the debug (image attached).  It seems everything is working okay from that standpoint.  Not sure why I am seeing nothing out on that same pin.  If I undstand it correctly RPi 4 and RPi 5 both use the same pin for serial data out.

By the way, the RPi 5 is much more responsive with the touch screen. :)

73,

Dan W9EQ

[pa3gsb]

Dan,

You are using this via the GPIO pins?

If that is the case you need to tell the rpi-5 to use the gpio pins by doing:

Voeg toe aan /boot/firmware/config.txt:

dtoverlay=uart0-pi5

Reboot and see if it is working for you.

Hope this helps

73 Johan

PA3GSB

Op dinsdag 13 januari 2026 om 03:49:01 UTC+1 schreef dan.ha...@gmail.com:

[Dan Habecker]

Johan,

Unfortunatley still no luck.

I found an example where someone uses the serial port to talk to a Flipper Zero.  In the example he sets up the console to talk through the serial port.  Particuarly in the cmdline.txt file he setup "console=ttyAMA0, 115200" in the beginning of the file.  I gave this is try and now I see data through the GPIO port during bootup and shutdown.  So it appears the GPIO port itself is working okay.

Not sure what to try next.

73,

Dan W9EQ

[pa3gsb]

Hi Dan,

I have done a test runnig a fresh image.

Checked the interfaces tab in the control centre app of the raspberry pi:

i activated the serial port and do not use the serial console.

in the config.txt 

dtparam=uart0=on 

pi@raspberrypi:~$ pinctrl get 14-17
14: a4    pn | hi // PIN8/GPIO14 = TXD0
15: a4    pu | hi // PIN10/GPIO15 = RXD0

During start the UART is already coupled to the GPIO pins.

i hava install sudo apt install minicom

connected the gpio pin 14 and 15 (fysical 8 and 10) by a wire

started the minicom -D /dev/ttyAMA0 -b 115200

and when typing characters on the keyboard they are echoing ; so the uart is working.

removing the wire no echo is seen.

please try if this is also working for you?

I have not checked this with pihpsdr.

The rpi-5 does contain a connection for a debug serial connection it uses a small connector and can be used to login via serial console connection.

But i think it should also be possible to remove this debug info and use this connector with a small connector to use this connector without soldering.

Some config changes needed i suppose; may be someone like to use this option; please let us know how this config should look like.

Hope this helps.

73 Johan

PA3GSB

Op dinsdag 13 januari 2026 om 21:08:17 UTC+1 schreef dan.ha...@gmail.com:

[Dan Habecker]

Johan,

I gave it a try and I get data out of the GPIO pin using minicom when pressing keys.

73,

Dan W9EQ

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