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spiport.pla
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spiport.pla
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include "inc/cmdsys.plh"
//
// Bit banged spi over gameport
//
const SPI_SLAVE_READY = '@'
const SPI_SLAVE_ERROR = '!'
const SPI_SLAVE_BUSY = $FF
word spiReadWriteByte, spiWriteBytes, spiReadBytes
asm spiInc
!SOURCE "vmsrc/plvmzp.inc"
!CPU 65C02
end
asm spiXferByteStd(outbyte)
PHP ; DISABLE INTS
SEI
STA $C05A ; ENABLE SLAVE
LDY #0 ; ASSUME MSB IS ZERO
LDA ESTKL,X ; GET ARGUMENT
BPL + ; CHECK MSB
INY ; IT'S A ONE
+ STA $C058,Y ; WRITE BIT 7
STA $C040 ; CLOCK
LDY #0 ; DOING THIS HERE GIVES TIME FOR OUTPUT TO BECOME STABLE - NOT REALLY NEEDED
ASL $C061 ; READ BIT 7 INTO CARRY
ROL ; ROTATE INTO ACC
BPL + ; REPEAT FOR ALL BITS
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C040
NOP
ASL $C061
STA $C05B ; DISABLE SLAVE
ROL
STA ESTKL,X ; SAVE RETURN PARAMETER
PLP
RTS
end
asm spiXferByteGS(outbyte)
PHP ; DISABLE INTS
SEI
LDA $C036 ; SET 1 MHZ
PHA
AND #$7F
STA $C036
STA $C05A ; ENABLE SLAVE
LDY #0 ; ASSUME MSB IS ZERO
LDA ESTKL,X ; GET ARGUMENT
BPL + ; CHECK MSB
INY ; IT'S A ONE
+ STA $C058,Y ; WRITE BIT 7
STA $C05C ; CLOCK FALLING EDGE
LDY #0 ; DOING THIS HERE GIVES TIME FOR OUTPUT TO BECOME STABLE - NOT REALLY NEEDED
STA $C05D ; CLOCK RISING EDGE
ASL $C061 ; READ BIT 7 INTO CARRY
ROL ; ROTATE INTO ACC
BPL + ; REPEAT FOR ALL BITS
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
LDY #0
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
LDY #0
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
LDY #0
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
LDY #0
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
LDY #0
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
LDY #0
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
BPL +
INY
+ STA $C058,Y
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
STA $C05B ; DISABLE SLAVE
ROL
STA ESTKL,X ; SAVE RETURN PARAMETER
PLA
STA $C036
PLP
RTS
end
asm spiReadBytesStd(buf, len)
PHP ; DISABLE INTS
SEI
LDA ESTKL+1,X
STA DSTL
LDA ESTKH+1,X
STA DSTH
LDA ESTKL,X
BEQ +
INC ESTKH,X
+ LDY #$00
- STA $C05A ; ENABLE SLAVE
STA $C040 ; CLOCK
NOP
ASL $C061 ; SHIFT IN ALL BITS STARTING WITH MSB
STA $C040
ROL
ASL $C061
STA $C040
ROL
ASL $C061
STA $C040
ROL
ASL $C061
STA $C040
ROL
ASL $C061
STA $C040
ROL
ASL $C061
STA $C040
ROL
ASL $C061
STA $C040
ROL
ASL $C061
STA $C05B ; DISABLE SLAVE
ROL
STA (DST),Y ; SAVE TO BUFFER
INY
BNE +
INC DSTH
+ DEC ESTKL,X
BNE -
DEC ESTKH,X
BNE -
INX ; REMOVE AN ARGUMENT
PLP
RTS
end
asm spiReadBytesGS(buf, len)
PHP ; DISABLE INTS
SEI
LDA $C036 ; SET 1 MHZ
PHA
AND #$7F
STA $C036
LDA ESTKL+1,X
STA DSTL
LDA ESTKH+1,X
STA DSTH
LDA ESTKL,X
BEQ +
INC ESTKH,X
+ LDY #$00
- STA $C05A ; ENABLE SLAVE
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061 ; SHIFT IN ALL BITS STARTING WITH MSB
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
ROL
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
ASL $C061
STA $C05B ; DISABLE SLAVE
ROL
STA (DST),Y ; SAVE TO BUFFER
INY
BNE +
INC DSTH
+ DEC ESTKL,X
BNE -
DEC ESTKH,X
BNE -
INX ; REMOVE AN ARGUMENT
PLA
STA $C036
PLP
RTS
end
asm spiWriteBytesStd(buf, len)
PHP ; DISABLE INTS
SEI
LDA ESTKL+1,X
STA SRCL
LDA ESTKH+1,X
STA SRCH
LDA ESTKL,X
BEQ +
INC ESTKH,X
+
- STA $C05A ; ENABLE SLAVE
LDY #0 ; ASSUME MSB IS ZERO
LDA (SRC),Y ; GET BYTE
BPL + ; CHECK MSB
INY ; IT'S A ONE
+ STA $C058,Y ; WRITE BIT 7
STA $C040 ; CLOCK
LDY #0 ; DOING THIS HERE GIVES TIME FOR OUTPUT TO BECOME STABLE
ASL ; ROTATE NEXT BIT TO SEND
BPL + ; REPEAT FOR ALL BITS
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL
BPL +
INY
+ STA $C058,Y
STA $C040
LDY #0
ASL
BPL +
INY
+ STA $C058,Y
STA $C040
STA $C05B ; DISABLE SLAVE
INC SRCL
BNE +
INC SRCH
+ DEC ESTKL,X
BNE -
DEC ESTKH,X
BNE -
INX ; REMOVE AN ARGUMENT
PLP
RTS
end
asm spiWriteBytesGS(buf, len)
PHP ; DISABLE INTS
SEI
LDA $C036 ; SET 1 MHZ
PHA
AND #$7F
STA $C036
LDA ESTKL+1,X
STA SRCL
LDA ESTKH+1,X
STA SRCH
LDA ESTKL,X
BEQ +
INC ESTKH,X
+
-- STA $C05A ; ENABLE SLAVE
PHX
LDX #8
LDY #0 ; ASSUME MSB IS ZERO
LDA (SRC),Y ; GET BYTE
- ASL
BCC + ; CHECK MSB
INY ; IT'S A ONE
+ STA $C058,Y ; WRITE BIT 7
STA $C05C ; CLOCK FALLING EDGE
STA $C05D ; CLOCK RISING EDGE
LDY #0
DEX
BNE -
STA $C05B ; DISABLE SLAVE
INC SRCL
BNE +
INC SRCH
+ PLX
DEC ESTKL,X
BNE --
DEC ESTKH,X
BNE --
INX ; REMOVE AN ARGUMENT
PLA
STA $C036
PLP
RTS
end
export def spiXferByte(outbyte)
return (spiReadWriteByte)(outbyte)
end
export def spiDelay(time)
return call($FCA8, time, 0, 0, 0) // DELAY
end
export def spiSend(data)
byte timeout, status
for timeout = 1 to 100 step 10
status = (spiReadWriteByte)(data)
if status <> SPI_SLAVE_BUSY
return status
fin
spiDelay(timeout)
next
putc(status);putc('0'+data/10);putc('0'+data%10)
return status
end
export def spiRecv
return spiSend(0)
end
export def spiWriteBuf(buf, len)
spiSend(13) // CMD_BUF_WRITE
spiSend(len >> 8); spiSend(len)
return (spiWriteBytes)(buf, len)
end
export def spiReadBuf(buf, len)
spiSend(12) // CMD_BUF_READ
spiSend(len >> 8); spiSend(len)
return (spiReadBytes)(buf, len)
end
export def spiReady
byte timeout
timeout = 0xFF
while (spiReadWriteByte)(0) <> SPI_SLAVE_READY and timeout // WAIT FOR READY
timeout--
spiDelay(10)
loop
return timeout
end
export def spiReset
^$C05B // DISABLE SLAVE SELECT
^$C05D // CLOCK RAISE (GS ONLY)
return spiReady
end
if call($FE1F, 0, 0, 0, 1).3 & 1 // GS ID ROUTINE
spiReadWriteByte = @spiXferByteStd
spiReadBytes = @spiReadBytesStd
spiWriteBytes = @spiWriteBytesStd
else
spiReadWriteByte = @spiXferByteGS
spiReadBytes = @spiReadBytesGS
spiWriteBytes = @spiWriteBytesGS
fin
//
// Keep module in memory
//
return spiReset <> 0
done