I did 57.6K on a ~1 MHz processor, but it was tx only. Still, it worked great for printf() output while bringing the board up. IIRC, on that same processor, I did a 1200 Bell-202 modem (rx and tx) using a counter/timer, but I used a hardware UART for that.
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Grant Edwards grant.b.edwards Yow! Th' MIND is the Pizza
at Palace of th' SOUL
The kernel never uses and never disables the FIQ. It runs completely outside of kernel awareness and control.
Been there, done that. The FIQ jitter does not change noticably under load. Any interactions with normal kernel code have to be done very carefully, since you can't use any of the kernel's normal synchronization mechanisms.
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Grant Edwards grant.b.edwards Yow! And then we could sit
at on the hoods of cars at
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