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mirror of https://github.com/hsoft/collapseos.git synced 2024-12-24 14:28:06 +11:00

sms/kbd: begin rewriting ps2ctl to Forth

So far, the resulting binary matches.
This commit is contained in:
Virgil Dupras 2020-05-17 14:24:27 -04:00
parent 8c4c879a65
commit 177e70580f
4 changed files with 59 additions and 13 deletions

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@ -2,7 +2,7 @@
: OPRdK CREATE C, DOES> C@ ( rd K op )
OVER _r256c 0xf0 AND 4 RSHIFT OR ( rd K op' )
ROT _r16+c 4 LSHIFT ROT 0x0f AND OR ( op' rdK ) A, A, ;
0x70 OPRdK ANDI, 0x30 OPRdK CPI, 0x0e OPRdK LDI,
0x70 OPRdK ANDI, 0x30 OPRdK CPI, 0xe0 OPRdK LDI,
0x60 OPRdK ORI, 0x40 OPRdK SBCI, 0x60 OPRdK SBR,
0x50 OPRdK SUBI,

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@ -1,2 +1,2 @@
#!/bin/sh
echo -e "660 LOAD H@ 256 /MOD 2 PC! 2 PC! \n$(cat -)\nH@ 256 /MOD 2 PC! 2 PC! " | ./stage
echo -e "660 LOAD H@ ORG !\n$(cat -)\nORG @ 256 /MOD 2 PC! 2 PC! H@ 256 /MOD 2 PC! 2 PC! " | ./stage

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@ -1,13 +1,9 @@
PROGNAME = ps2ctl
AVRDUDEMCU ?= t45
AVRDUDEARGS ?= -c usbtiny -P usb
TARGETS = $(PROGNAME).bin os.sms
TARGETS = $(PROGNAME).bin
BASEDIR = ../../..
ZASM = $(BASEDIR)/emul/zasm/zasm
KERNEL = $(BASEDIR)/kernel
APPS = $(BASEDIR)/apps
AVRA = $(BASEDIR)/emul/zasm/avra
AVRINC = $(BASEDIR)/avr
EDIR = $(BASEDIR)/emul
# Rules
@ -19,11 +15,8 @@ all: $(TARGETS)
send: $(PROGNAME).bin
avrdude $(AVRDUDEARGS) -p $(AVRDUDEMCU) -U flash:w:$(PROGNAME).bin
$(PROGNAME).bin: $(PROGNAME).asm
$(AVRA) $(AVRINC) < $(PROGNAME).asm > $@
os.sms: glue.asm
$(ZASM) $(KERNEL) $(APPS) < glue.asm > $@
$(PROGNAME).bin: $(PROGNAME).fs
cd $(EDIR) && ./avra.sh < ../recipes/sms/kbd/$(PROGNAME).fs > ../recipes/sms/kbd/$@
clean:
rm -f $(TARGETS)

53
recipes/sms/kbd/ps2ctl.fs Normal file
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@ -0,0 +1,53 @@
( Receives keystrokes from PS/2 keyboard and send them to the
'164. On the PS/2 side, it works the same way as the controller
in the rc2014/ps2 recipe. However, in this case, what we have
on the other side isn't a z80 bus, it's the one of the two
controller ports of the SMS through a DB9 connector.
The PS/2 related code is copied from rc2014/ps2 without much
change. The only differences are that it pushes its data to a
'164 instead of a '595 and that it synchronizes with the SMS
with a SR latch, so we don't need PCINT. We can also afford to
run at 1MHz instead of 8.
*** Register Usage ***
GPIOR0 flags:
0 - when set, indicates that the DATA pin was high when we
received a bit through INT0. When we receive a bit, we set
flag T to indicate it.
R16: tmp stuff
R17: recv buffer. Whenever we receive a bit, we push it in
there.
R18: recv step:
- 0: idle
- 1: receiving data
- 2: awaiting parity bit
- 3: awaiting stop bit
R19: Register used for parity computations and tmp value in
some other places
R20: data being sent to the '164
Y: pointer to the memory location where the next scan code from
ps/2 will be written.
Z: pointer to the next scan code to push to the 595 )
0x015f CONSTANT RAMEND
0x11 CONSTANT GPIOR0
0x16 CONSTANT PINB
1 CONSTANT DATA
H@ ORG !
L1 FLBL, ( main )
L2 FLBL, ( hdlINT0 )
( Read DATA and set GPIOR0/0 if high. Then, set flag T.
no SREG fiddling because no SREG-modifying instruction )
RJMPOP L2 FLBL! ( hdlINT0 )
PINB DATA SBIC,
GPIOR0 0 SBI,
SET,
RETI,
RJMPOP L1 FLBL! ( main )
16 RAMEND 0xff AND LDI,