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A comment on The Rock 5B is not a Raspberry Pi killer–yet. Parent comment
In theory, the Beaglebone SBCs are excellent for this.
The Beaglebone Black (2014 era design, but still works) has Hard-Realtime PRUs for those kinds of loops.
More recent Beaglebone AI (2018ish) has a Cortex-A + 2xArm Cortex-M4, so two embedded microcontrollers for you to use onboard.
The most recent Beaglebone AI 64 has a Cortex-A main-core + Cortex-R cores for guaranteed realtime operations.
Oh yeah, and those PRUs never went away either.
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In theory, the Beaglebone SBCs are excellent for this.
The Beaglebone Black (2014 era design, but still works) has Hard-Realtime PRUs for those kinds of loops.
More recent Beaglebone AI (2018ish) has a Cortex-A + 2xArm Cortex-M4, so two embedded microcontrollers for you to use onboard.
The most recent Beaglebone AI 64 has a Cortex-A main-core + Cortex-R cores for guaranteed realtime operations.
Oh yeah, and those PRUs never went away either.