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Hi Brian;

I have been trying on the following code modified from your bolderflight github for reading SBUS input from a frsky receiver on teensy4:
#include "Wire.h"
#include "SBUS.h"

// a...

I have tried using 3.3V or 5V, lowering the CPU speed to 24MHz, using #include <I2C_t3.h>. All not working on teensy4.

I have been trying on the following code for reading SBUS input from a frsky receiver:
#include "Wire.h"
#include "SBUS.h"

// a SBUS object, which is on hardware
// serial port 1
SBUS...

I have tried installing the teensy add-on but it says it supports up to 1.8.9.