I'm looking for an accurately-settable, low frequency, jitter-free output pulse from Teensy 4. The Frequency Timer 2 library allows setting the period in microseconds, but is not yet ported to T4. The analogWriteFrequency(pin, freq) command does work, but the minimum frequency seems to be around 18 Hz. While it takes frequency as a floating-point value, I'm not sure what the true resolution is. Looking at cores/teensy4/pwm.c I don't know how to tell whether it's using flexpwm or quadtimer, or if there is any performance difference. Before I dive into the timer hardware registers, is there any other example of hardware frequency output on T4?