[Louis] sent in a tutorial for getting hardware SPI on his Raspi ... After connecting an Arduino to the MOSI, MISO and SCK pins of his Arduino, [Louis] was able to transfer data from his Raspi ...
Not according to [techtoys], who has created an Arduino shield that creates an HDMI output from an SPI control input. This is a project that seems to have been around for a couple of years ...
The shield is compatible with both the Arduino IDE and STM32Cube IDE, making it work with popular boards like the Arduino UNO ...
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