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collapseos/blk/596
Virgil Dupras 46676547d9 spi: add SPI_DELAY decl
AVR chips often run at less than z80's system clock. This means that
our SPI relay needs to have its own clock to properly communicate
with it. This means that the delay between OUT and IN can't be
hardcoded to 2 NOPs anymore. It needs to be configurable.
2020-08-23 07:55:17 -04:00

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CODE (spix) ( n -- n )
HL POP,
chkPS,
A L LDrr,
SPI_DATA OUTiA,
SPI_DELAY
SPI_DATA INAi,
L A LDrr,
HL PUSH,
;CODE
CODE (spie) SPI_CSLOW OUTiA, ;CODE
CODE (spid) SPI_CSHIGH OUTiA, ;CODE