AT91 SPI Slave - Anyone get it to work?

I'm working on an AT91SAM9260EK board, and am trying to use the SPI1 bus in slave mode under Linux.

I have an interrupt handler, and am doing byte-at-time transactions using SPI_TDR and SPI_RDR (and SPI_TDRE and SPI_RDRF interrupts)

I can receive bytes fine, but my transmitted bytes seem garbled.

My scoped lines looks like clean data and clock, just *wrong* data.

I am running at 100Khz, so it shouldn't be a speed issue.

I'm using 8-bit data buffers.

I've been working on this for about a week, and I'm ready to tear my hair out in frustration.

Has *anyone* gotten their AT91 SPI to work in slave mode in any fashion?

Thanks.

Jason Mcmullan <[email protected]>
Evil Labs


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