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I meant syntactically. The lexer treats '*' as an operator token which means whitespace around it is ignored. So long as it isn't part of a larger operator or comment sequence (such as *= or /*, */)

Spaces are immaterial, * is an operator.

For this sort of signal speed a low-impedance probe might be the best option, basically a 10:1 probe with 500 ohms input impedance and using 50 ohm setting at the scope. High impedance probes are capacitive-dividers at the top end of their...

Is this thread of use? https://forum.pjrc.com/index.php?threads/complimentary-pwm-on-teensy-4-1.73347/#post-330199

The ATmega328 has no CLKO, it will accept an input clk into XTAL1 pin, limit 16MHz. There is no system clock output. You can generate 8MHz on some of the GPIO pins using suitably programmed PWM. 150MHz is a lot, more than is sensible for...

You know about PWM (without LC smoothing) being bad for Peltier devices and their efficiency? Fixing that will also cure the uneven current drain.