LibreSDR - how to enable PTT?

[sq6emm]

Anyone already tried to expose PTT from LibreSDR?
How to do that? from where?
Do I need to enable that in the firmware? (is this already supported?)

[pa3gsb]

By placing a module to the debug output it must be possible to read the output and you are able to react on special commands.

In https://github.com/F5OEO/tezuka_fw/blob/main/board/pluto/overlay_maia/root/watchconsoletx.sh

if [ "$txmute" = "1" ] ; then
echo "SdrConsole PTT OFF"
pttoff
else
echo "SdrConsole PTT ON"
ptton
fi

translate PTT ON / PTT OFF to an output port!

Big advantage no need to open the libre and it is for me not clear which fpga io pins or mio pins from the arm processor are available?

[pa3gsb]

i have connected to the otg port a arduino pro micro.

The micro should get the echo from the libre and must control the PTT.

The terminal shows me 👍 # dmesg | grep -i usb
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
usbcore: registered new interface driver rt2500usb
usbcore: registered new interface driver rt73usb
usbcore: registered new interface driver rt2800usb
usbcore: registered new interface driver rtl8187
usbcore: registered new interface driver rtl8192cu
usbcore: registered new interface driver rtl8xxxu
usbcore: registered new interface driver rtl8150
usbcore: registered new interface driver r8152
usbcore: registered new interface driver lan78xx
usbcore: registered new interface driver asix
usbcore: registered new interface driver ax88179_178a
usbcore: registered new interface driver cdc_ether
usbcore: registered new interface driver dm9601
usbcore: registered new interface driver smsc75xx
usbcore: registered new interface driver smsc95xx
usbcore: registered new interface driver rndis_host
usbcore: registered new interface driver r8153_ecm
usbcore: registered new interface driver usb-storage
usbcore: registered new interface driver usbserial_generic
usbserial: USB Serial support registered for generic
usbcore: registered new interface driver ftdi_sio
usbserial: USB Serial support registered for FTDI USB Serial Device
ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 6.01
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: EHCI Host Controller
usb usb1: Manufacturer: Linux 6.1.0 ehci_hcd
usb usb1: SerialNumber: ci_hdrc.0
hub 1-0:1.0: USB hub found
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
usbcore: registered new interface driver r8712u
usbcore: registered new interface driver r8188eu
usb 1-1: new full-speed USB device number 2 using ci_hdrc
usbcore: registered new interface driver snd-usb-audio
usb 1-1: New USB device found, idVendor=2341, idProduct=8037, bcdDevice= 1.00
usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-1: Product: Arduino Micro
usb 1-1: Manufacturer: Arduino LLC
usb0: HOST MAC 00:e0:22:c6:c5:50
usb0: MAC 00:05:f7:10:13:ec

So the libre sdr is the host; and the arduino is the slave.

ls /dev/tt*

i do not see a serial device.

We need to add a driver to make this work. Need to figure how to make this work. Are there ideas?

73 Johan
PA3GSB

[F5OEO]

Should be fixed with 8301252

[pa3gsb]

Tnx i rebuild the image and i connect a arduino with a sketch and iam able to enable or disable the tx.

Having now an additonal serial port for specific controls i want to solve this by modifying the sh script:

DEVICE="/dev/ttyACM0"
...

if [ -e "$DEVICE" ]; then
echo "PTT ON" > "$DEVICE"
fi

....
if [ -e "$DEVICE" ]; then
echo "PTT OFF" > "$DEVICE"
fi

Do you agree this approach? and are you willing to accept pull requests or do you modify the file yourself (it is only a small change).

[pa3gsb]

#53

[pa3gsb]

issue solved. #75

[F5OEO]

Could be interesting to continue with arduino or pi pico to control libre trough mqtt commands over serial !