Fork Sand fork of the Globotron USG v1.0 Hardware Firewall.

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Robert Fisk 2e3293e84f Increase SPI interface speed 4x, to 5.25Mbps. Required modifications to ... SPI peripheral library. At this speed SPI requires ~60% CPU time at -Og optimisation level. This could be further improved by trimming down the SPI interrupt. But... Speed is now limited by Downstream's single-packet-per-URB restriction, to about 460kB/s. USB Middleware does not implement TX FIFO empty interrupt, so a bit of work is required here.		10 years ago
Downstream	Increase SPI interface speed 4x, to 5.25Mbps. Required modifications to	10 years ago
Upstream	Increase SPI interface speed 4x, to 5.25Mbps. Required modifications to	10 years ago