On 5 August 2016 at 03:46, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > Performance figures for reading from a QSPI FLASH driven at 24.375 MHz > on r8a7791/koelsch: > - Single: 1.1 Mbps PIO, 23 Mbps DMA > - Dual : 12.7 Mbps PIO, 48 Mbps DMA > - Quad : 13 Mbps PIO, 70 Mbps DMA Thanks for those numbers. I have something to aim for now. :) What I'm seeing on my logic analyser with the bus at 10MHz is 8 clocks taking ~500ns, ~1700ns of idle and then 8 more clocks. spi-rpi doesn't seem to set any of the registers for adding in delays so I guess it's to do with the DMA controller. Cheers, Daniel
