Thank you again for helping with this! "Is this a different device from the ATSAME54P20A?": Yes, it is the same model of CPU. "was this bit banging done with the same SPI pins as the SPI peripheral": I bit banged the SPI protocol using the same CS, MOSI, and CLK pins as would have been used by hardware SPI. The only difference should be that software SPI is a lot slower than the Hardware SPI "are you sure there is a good ground shared from CPU B to DAC B": Good question. Let me double check that. The ground connection is very good. Measured with multimeter, and checked with Oscilloscope to look for groundbounce or noise. Seems to be a great connection "Have you found this issue on multiple 'B' boards that you've manufactured?" Yes, every "B" board seems to be this way.
↧