Using the 8x4 CLPD board with FPP test sequences and Xlights test panel, there is no output (build-in sequences work fine). The underlying issue appears to be the transmission rate from both of these is high enough that it collides w/ the DMA transfer from the PI.
Adding in barriers around spi_dma_tx_start to Update as was done in Blackout solved the problem.
Using the 8x4 CLPD board with FPP test sequences and Xlights test panel, there is no output (build-in sequences work fine). The underlying issue appears to be the transmission rate from both of these is high enough that it collides w/ the DMA transfer from the PI.
Adding in barriers around spi_dma_tx_start to Update as was done in Blackout solved the problem.