124da6adec
Although the SPI Relay driver is RC2014-specific, the SD Card driver is generic enough to be a subsystem. That's the second subsystem we add and this warrants, I think, the formalization of a new concept: protocols.
28 lines
806 B
Plaintext
28 lines
806 B
Plaintext
# Protocols
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Some subsystems (and in the case of KEY and EMIT, the core) re-
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quire drivers to implement certain words in a certain way. For
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example, the core requires drivers to implement (key) and (emit)
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or else it won't know how to provide a console.
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These protocols are described here.
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# TTY protocol
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(key) -- c Returns the next typed key on the console.
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If none, block until there is one.
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(emit) c -- Spit a character on the console.
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# PS/2 protocol
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(ps2kc) -- kc Returns the next typed PS/2 keycode from the
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console. Blocking.
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# SPI Relay protocol
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(spie) -- Enable SPI device
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(spid) -- Disable SPI device
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(spix) n -- n Perform SPI exchange (push a number, get a
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number back)
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