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Using MSP together with Serial ELRS #66

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cmakelabs opened this issue Jan 11, 2025 · 4 comments
Closed

Using MSP together with Serial ELRS #66

cmakelabs opened this issue Jan 11, 2025 · 4 comments

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@cmakelabs
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Thank you for providing this bridge for msp, I am wondering is it possible to use MSP to send commands from the companion computer that is connected via UART to the FCU, while in the same time keeping the connection to the RC sticks transmitter(through ELRS receiver)? If yes, what would be the right way to achieve that and how BetaFlight would be configured? Would be really grateful for your guidance.
@christianrauch
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You want to control the FC via MSP and the RC at the same time? I don't think this is possible. From the Betaflight documentation:

There are 3 features that control receiver mode:

RX_PPM
RX_SERIAL
RX_PARALLEL_PWM
RX_MSP

Only one receiver feature can be enabled at a time.

If you want to control the FC via MSP, you have to set this to RX_MSP. See also https://github.com/christianrauch/msp?tab=readme-ov-file#sending-and-receiving-rc-commands.

If you have questions around supporting multiple receivers at the same time, you better ask this in a Betaflight forum or such.

@cmakelabs
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Thank you, I am just wondering how then can someone takeover with RC in case the control commands from the companion computer went wrong?

@christianrauch
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Thank you, I am just wondering how then can someone takeover with RC in case the control commands from the companion computer went wrong?

I think this is simply not possible. But check this with the Betaflight developers and forums.

If you are ok with doing such a switch on the PC, you could read the RC values via MSP_RC, use one of the channels as the switch, and then either send the original RC values back to the FC via MSP_SET_RAW_RC or send values from you own controller.

@cmakelabs
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Thank you

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@christianrauch @cmakelabs