Shows SPI activity. Replace SPI with SPIDebug, and replace chip select's DigitalOutput with CSDebug. Outputs debug info on stdout. Currently only outputs 8-bit debug info. Easy enough to change that if your SPI debug uses a larger data width.
History
SPIDebug library initial commit
2012-04-10, by davervw [Tue, 10 Apr 2012 04:42:12 +0000] rev 0
SPIDebug library initial commit