Angrodri

But calling Timer1.initialize(1000) changes totally the picture:

Just for the records, some images. Oscilloscope screen capture after analog-writing 230 to pin 25. All normal.

I had a related issue. I'm working on a project using Teensy 4.1. Among other features, it includes a 4 inch 480x320 SPI display with PWM backligght control. Pin 25 was used for this purpose. But TimerOne screwed-up PWM output. Duty cycle was...