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Recipes contain bits and pieces of hardware-related knowledge, but these bits feel sparse. I've been wanting to consolidate hardware- related documentation for a while, but always fell at odds with the recipes organisation. We don't have recipes anymore, just a /doc/hw section that contains hardware-related documentation which often translate to precise instructions to run Collapse OS on a specific machine. With this new organisation, I hope to end up with a better, more solid documentation.
14 lines
501 B
Plaintext
14 lines
501 B
Plaintext
# Communicating through SPI
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Many very useful device are able to communicate through the SPI
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protocol, for example, SD cards and AVR MCUs. In many cases,
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however, CPUs can't "speak SPI" because of their inability to
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bit-bang.
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In most cases, we need an extra peripheral, which we can build
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ourselves, to interface with devices that "speak SPI". We call
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this peripheral a SPI relay.
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The design of those relays depend on the CPU architecture. See
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spi.txt in arch-specific folders for more information.
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