Published at LXer:

The PRU-ICSS (Programmable Real-Time Unit and Industrial Communication Subsystem) coprocessor, typically shorthanded to PRU, is built into the Texas Instruments Sitara AM3559 system-on-chip that drives the Linux-ready Beaglebone Black SBC. The Sitara SoC’s PRU, which comprises dual, 200MHz, 32-bit RISC microcontrollers, is designed for customizing I/O that requires deterministic, real-time processing and ultra-low-latency. Yet, the PRU is so notoriously difficult to program, most BB Black hackers are hardly aware it’s there.

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