collapseos/drv/sdc.z80
Virgil Dupras a2d89de557 drv/sdc: implement core words in z80
In addition to making the driver significantly faster, it allows us
to make SDC port configuration opaque to sdc.fs.
2020-04-18 20:33:51 -04:00

22 lines
302 B
Z80 Assembly

( n -- n )
( Initiate SPI exchange with the SD card. n is the data to
send. )
CODE _sdcSR
HL POPqq,
chkPS,
A L LDrr,
SDC_SPI OUTnA,
NOP, NOP,
SDC_SPI INAn,
L A LDrr,
HL PUSHqq,
;CODE
CODE _sdcSel
SDC_CSLOW OUTnA,
;CODE
CODE _sdcDesel
SDC_CSHIGH OUTnA,
;CODE