mirror of https://github.com/hsoft/collapseos.git
16 lines
576 B
Plaintext
16 lines
576 B
Plaintext
SPI relay driver
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This driver is designed for a ad-hoc adapter card that acts as a
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SPI relay between the z80 bus and the SPI device. Sending any-
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thing on SPI_CSLOW and SPI_CSHIGH is expected to select/deselect
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the device, and writing to SPI_DATA is expected to initiate a
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byte exchange. The result of the exchange is excpected to be re-
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trieved by reading SPI_DATA.
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You also need to define the exchange delay with SPI_DELAY. If
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SPI clock is the same as system clock, 2 NOPs are enough:
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: SPI_DELAY NOP, NOP, ;
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Provides the SPI relay protocol. Load driver with "596 LOAD".
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