Hi, *The attached patch is just for opening a discussion, please don't merge*
We used the SPI slave interfaces on stm32h7 platform, in a configuration where two stm32h7 chips were connected together with SPI bus, one in master simplex-tx and one in slave simplex-rx mode. There was quite high data rate from master to slave, and the slave controller & device interfaces, which are defined in include/nuttx/spi/slave.h were quite inefficient to use. Namely, we needed this kind of features to the slave interfaces: * a possibility for slave controller driver to just buffer incoming data and slave device driver to poll for it at certain interval * possibility for copying larger buffers of data at one call; now each call to getdata can only return 2 bytes at a time I tackled these issues by changing the spi slave interface like in the attached patch. So adding a "poll" function for the controller interface and modifying the data handling functions in a way that larger blocks of data can be managed in one call. Obviously, this approach is incompatible with the existing SPI slave controller & spi slave drivers (on samv7 platform). So the questions which arise * Do you think that there is an alternative way to reach those goals using the existing interface? * Would it be reasonable to re-visit the spi slave interfaces to support high data rates more efficiently? Br, Jukka
