Radio control based on PPM input Some STM32 boards have the option to configure RADIO_CONTROL_PPM_PIN. See the board makefile for configure options of the pins. If they set the PPM_CONFIG makefile variable, add it to the target. The PPM_CONFIG define is then used in the _board_.h file to set the configuration.
Select PPM config, as some boards can used different mapping for the ppm input pin