# VOXL 2 IO RC with RB5 Flight on recent VOXL SDK releases

Source: https://forum.modalai.com/topic/2914/voxl-2-io-rc-with-rb5-flight-on-recent-voxl-sdk-releases
Category: Development Drones (https://forum.modalai.com/category/44/development-drones)
Tags: rb5
Posted: 2023-12-01 15:47:27 UTC by dscott
Replies: 2 · Views: 696

## dscott · 2023-12-01 15:47:27 UTC

From what I understand from the documentation, using a M0065 VOXL 2 IO board for SBUS RC input should be supported with VOXL SDK 1.0.1 and 1.1.0 (and also with 1.1.1 after an update of the M0065). However, our RB5 Flight on 1.1.0 was still not reading any RC channels after updating from 0.9.5. 

I noticed in the `voxl-px4-start` script that the M00052/RB5 Flight board has a [special case](https://github.com/modalai/px4-firmware/blob/7b16c2cb1dee358c308d175767afa1234eb9f138/boards/modalai/voxl2/target/voxl-px4-start#L135) for getting RC input with Spektrum receiver from the apps processor, while other boards use the DSP. Meanwhile, the `dsp_sbus` driver used for getting RC input from M0065 seems to be specifically for the DSP, and defaults to a [port number 7](https://github.com/modalai/px4-firmware/blob/7b16c2cb1dee358c308d175767afa1234eb9f138/boards/modalai/voxl2-slpi/src/drivers/dsp_sbus/dsp_sbus.cpp#L55), which seems to correspond to the VOXL2 [RC interface](https://docs.modalai.com/voxl2-connectors/#j19---external-sensors-2x-uart-2x-i2c), but not [RB5 Flight](https://docs.modalai.com/Qualcomm-Flight-RB5-connectors/#j12-rc-uart-spektrumdsmx). Adding an argument to change this to 13 didn't work for our RB5 Flight.

This still seems to be case for the [same script in SDK 1.1.1](https://github.com/modalai/px4-firmware/blob/cf055af349bcd7a141640936184e03054863022b/boards/modalai/voxl2/target/voxl-px4-start#L159), where the new `voxl2_io` driver, while not noted to be DSP-specific, also specifies a 7.

Is the combination of VOXL 2 IO (in any form) RC, VOXL SDK 1.1.0+, and RB5 Flight supposed to be supported? And if not, is support planned to be added in the future?

## Reply by Eric Katzfey (ModalAI staff) · 2023-12-01 17:02:49 UTC

@dscott Unfortunately, we overlooked that particular configuration and it is not supported yet. We are looking at the best ways to support this configuration to try and get you something that you can use.

## Reply by Eric Katzfey (ModalAI staff) · 2023-12-01 20:44:32 UTC (in reply to Eric Katzfey)

@Eric-Katzfey There is a new dev version of voxl-px4 located here: http://voxl-packages.modalai.com/dists/qrb5165/dev/binary-arm64/voxl-px4_1.14.0-2.0.61-202312011240_arm64.deb. Can you `wget` that and then load it on top of SDK 1.1.1? You can then modify the `/etc/modalai/voxl-px4.conf` file to specify `RC=M0065_SBUS` to use M0065 with SBUS. Once you restart you should have it working with M0065 SBUS. It has received very minimal testing at this point but you are welcome to give it a shot.