On Wed, 31 Aug 2022 09:47:50 +0200 Vincent Whitchurch <vincent.whitchurch@xxxxxxxx> wrote: > On Sun, Aug 28, 2022 at 07:24:30PM +0200, Jonathan Cameron wrote: > > On Wed, 24 Aug 2022 12:40:02 +0200 > > Vincent Whitchurch <vincent.whitchurch@xxxxxxxx> wrote: > > > Add support for triggered buffers. Just read the channels in a loop to > > > keep things simple. > > > > Just curious, but what other options are there? A quick datasheet scroll > > through didn't seem to suggest you can overlap setup of next read with > > reading out the previous (common on SPI ADCs). > > You're right that the hardware doesn't support any special method to > read out multiple channels; I can mention that in the commit message. > But I think you could construct a spi_message which a bunch of > spi_transfers which toggle the CS appropriately between them to read out > multiple channels in one go? (Note that the variants have different > data formats, and many of the variants only have one channel.) That might be a little more efficient on a suitably advanced SPI controller, or where the overhead of jumping between drivers is large, but in many cases it won't save that much. Would need an experiment on a platform someone cares about to decide if it is worthwhile. Jonathan
