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@Gordon
Which board are you using? All your other questions seem to have been about ESP32.
Do you want to output just a single pulse? If you do have an STM32-based board likle in https://www.espruino.com/STM32+Peripherals I believe you should be able to set the timer not to auto-reload, in which case it'll just do one pulse.
... or you can maybe use SPI - put the pulse (or pulses) you want as bits in an array, and then just use SPI to send the array and the pulses will appear on the MOSI line