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+--- Sujet : GPIO state change during TX (/thread-772.html)
GPIO state change during TX - sp6hfe - 23-11-2024
Hi All,
I am building my 1st QO-100 station and I designed it in a way that the PA's power is going through a relay.
I am interested in where to look in the Remote SDR's code in order to inject dedicated RPI's GPIO voltage level change when TX is ongoing.
What I want to achieve is to cut-off PA's power when there is no transmission in Remote SDR.
Other option would be to add a toggle switch somewhere on GUI to change the state of a dedicated GPIO. With that I would arm TX path with power when I plan to transmit.
3rd option would be to use PWM output from RPI. With a bit of filtering on the relay side I would turn the relay on only when certain PWM signal would appear. That would prevent reacion on voltage steady states.
If anyone has any idea please drop here a line or two.
Thanks!
73
RE: GPIO state change during TX - F1ATB - 23-11-2024
This fonction is implemented already. Look here on security chapter, https://search.app?link=https%3A%2F%2Ff1atb.fr%2Fqo-100-transceiver%2F&utm_campaign=aga&utm_source=agsadl2%2Csh%2Fx%2Fgs%2Fm2%2F4
RE: GPIO state change during TX - sp6hfe - 23-11-2024
Hello Andre,
actually I have overlooked that description on your website.
My question would be: is GPIO level being toggled when audio rx is enabled?
And at the same time: is GPIO number configurable on RPI4?
Thanks!
73
RE: GPIO state change during TX - F1ATB - 24-11-2024
https://f1atb.fr/qo-100-transceiver/
The GPIO 26 is toggled only during TX audio transmission.
In the code you can modify the GPIO number.
André
RE: GPIO state change during TX - sp6hfe - 25-11-2024
Andre,
what is the frequency of the GPIO toggling and which file is responsible for toggling GPIO definition?
Many thanks!
73
RE: GPIO state change during TX - F1ATB - 25-11-2024
Around 50Hz If I correctly remember. Ther is no file, it's each time data from your microphone is received.
André
F1ATB
RE: GPIO state change during TX - sp6hfe - 28-11-2024
Andre,
you have said: "In the code you can modify the GPIO number" so I am interested in which file it is defined?
RE: GPIO state change during TX - sp6hfe - 29-11-2024
Andre,
I have discovered GPIOS are settable on the Settings page of Remote SDR. Wasn't that so intuitive for me but after checking your YouTube videos I have understood where and how to configure.
Regarding GPIO that should be turning on a relay delivering power to the PA do I understand it correct that this one is not settable in Settings under GPIO section either in Rx Configuration or Tx Configuration? As written in both sections "NumGPIO 7 or pin 26 reserved for Transmit security Oscillator" meaning it can't be used because this is the one toggling automatically on every 256B of received audio data?
Thanks for confirmation.
RE: GPIO state change during TX - F1ATB - 29-11-2024
Yes confirmed. Fixed GPIO number.
André