Once you've wired up your Receiver to your Flight Controller, you need to setup the UART for Serial RX. This is usually done on the Ports Tab of your Flight Controller Configurator.
In the example below, the Receiver is wired to UART1 (TX1 and RX1 pads), and so the Serial RX column should be enabled on UART1 in the Ports Tab.
This is ONLY an example. Set your Ports according to how your peripherals, including the Receiver, are wired up.
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UART-based ExpressLRS Receivers use the CRSF Serial Protocol to communicate with a Flight Controller.
Follow the steps below to set up your Serial Receiver Protocol:
The Location or Labels of these settings can change from version to version of your Flight Controller Configurator. Please consult your Flight Controller Configurator User Guides.
re done setting these up.
For flight controllers based on Betaflight, there are 'RC Link Presets' available that configure feedforward smoothing and associated link settings based on your packet rate and usage case.
Using no link preset, or using the incorrect one for your packet rate, can result in unwanted noise and jitter in feedforward, which can affect setpoint tracking and thus flight characteristics.
To install the correct 'RC Link Preset', follow these steps in Betaflight Configurator:
Close your Flight Controller Configurator once you've set it up for ExpressLRS. Keeping it open could prevent the next steps from completing properly, particularly flashing via Passthrough. You must also unplug the FC from USB before proceeding to the next steps to refresh the connection.
With your Flight Controller configured, you can now proceed to the next step: Checking RX Firmware Version.
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -->
