Higher-level abstractions for setting SPI transfer_size

This is a feature request, not a bug report.

Currently, the command line parsers and device configuration settings for the MAX7219 devices in the luma library allow the SPI bus speed (i.e. clock speed) and CS active-high to be set, but there’s no way to adjust the maximum transfer_size parameter, which is exposed by the spi class constructor (the default is 4096). I think this would be very useful for me to debug my glitchy MAX7219-based displays; the raspberry pi supports 4096, but I think the cascaded MAX7219s in my display would be happier with smaller words. I don’t want to have to manually override the default parameter in the core library, it would be great if this could be supported from the command line argument parser.

[thijstriemstra]

Maybe you can try it, it’s exactly the same as https://github.com/rm-hull/luma.core/commit/5c688227fc26d0373a92e778813dc60fb514aeba but then for transfer_size @drspangle

[rm-hull]

Will create a new release tomorrow for this