Does any one knows what type of interface should be used here. I think it will be custom SPI with bitbang or there is another way?

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Best answer by Pavel A.

Looks like normal SPI with 18 bits data size. No need to bitbang.

SPI controller of some STM32s allows moving up to 32 bits at once.

Pavel A.Best answer

Looks like normal SPI with 18 bits data size. No need to bitbang.

SPI controller of some STM32s allows moving up to 32 bits at once.

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