There's actually a cortex-m3 core also hiding in the Beaglebone's chip, doing power management. Regarding C vs asm, I started writing some 8mhz 4-bit capture c

There's actually a cortex-m3 core also hiding in the Beaglebone's chip, doing power management. Regarding C vs asm, I started writing some 8mhz 4-bit capture code in C but found asm was easier to reason about timings. One line of code is 5ns, done. (apart from some memory access).