how to share the SPI bus between this crate and another?

[mutantbob]

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If I want to transfer data between an OV5642 camera (SPI) and an ST7789 display, how do I share the SPI bus?

The display_interface_spi::SPIInterface takes ownership of the SPI object, preventing me from sharing it with the OV5642, and I can not buffer the entire image (320x240 even converted to 16 bits would exceed the RAM on the Arduino Uno).

[almindor]

This is a problem in the HAL of your PAC. I've tried to solve this for the RISC-V MCUs of E310x family by introducing a shared device concept based on this design with this similar implementation in the HAL

So sadly if you need shared bus, the HAL implementor for your SoC will need to add that.

[almindor]

As for a workaround you can use release() to get the SPI back and sort of just juggle the around. Display interface has a release() as well which will give you the whole thing back. It's a crappy workaround tho.