Golden Oldie
Everything should have a RS232/Serial port
Even tough RS232 is from the 60’s it is still something that should be available on every device (a TTL version is acceptable too). Most embedded CPU’s, even big ones like the iMX8 have one or more serial ports that are useable without the need of complex software stacks.
Especially that serial ports can be used without a complex software stack, on some CPU’s it can be as simple as writing a byte to a register, makes them a very powerful tool.
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