apps/basic/README.md

@@ -103,23 +103,3 @@ stored where specified. For example, `input x` stores the result of the
 evaluation in variable `x`. Before the variable name, a quoted string literal
 can be specified. In that case, that string will be printed as-is just before
 the prompt.
-
-**peek/deek**: Put the value at specified memory address into specified
-variable. peek is for a single byte, deek is for a word (little endian). For
-example, `peek 42 a` puts the byte value contained in memory address 0x002a
-into variable `a`. `deek 42 a` does the same as peek, but also puts the value
-of 0x002b into `a`'s MSB.
-
-**poke/doke**: Put the value of specified expression into specified memory
-address. For example, `poke 42 0x102+0x40` puts `0x42` in memory address
-0x2a (MSB is ignored) and `doke 42 0x102+0x40` does the same as poke, but also
-puts `0x01` in memory address 0x2b.
-
-**in**: Same thing as `peek`, but for a I/O port. `in 42 a` generates an input
-I/O on port 42 and stores the byte result in `a`.
-
-**out**: Same thing as `poke`, but for a I/O port. `out 42 1+2` generates an
-output I/O on port 42 with value 3.
-
-**sleep**: Sleep a number of "units" specified by the supplied expression. A
-"unit" depends on the CPU clock speed. At 4MHz, it is roughly 8 microseconds.

apps/basic/main.asm

@@ -56,17 +56,17 @@ basCallCmd:
 	; let's see if it's a variable assignment.
 	call	varTryAssign
 	ret	z	; Done!
-	push	de		; --> lvl 1.
+	; Second, get cmd length
-	ld	de, SCRATCHPAD
+	call	fnWSIdx
-	call	rdWord
+	cp	7
-	; cmdname to find in (DE)
+	jp	nc, unsetZ	; Too long, can't possibly fit anything.
-	; How lucky, we have a legitimate use of "ex (sp), hl"! We have the
+	; A contains whitespace IDX, save it in B
-	; cmd table in the stack, which we want in HL and we have the rest of
+	ld	b, a
-	; the cmdline in (HL), which we want in the stack!
+	ex	de, hl
-	ex	(sp), hl
 	inc	hl \ inc hl
 .loop:
-	call	strcmp
+	ld	a, b		; whitespace IDX
+	call	strncmp
 	jr	z, .found
 	ld	a, 8
 	call	addHL
@@ -74,14 +74,15 @@ basCallCmd:
 	cp	0xff
 	jr	nz, .loop
 	; not found
-	pop	hl		; <-- lvl 1
 	jp	unsetZ
 .found:
 	dec	hl \ dec hl
 	call	intoHL
 	push	hl \ pop ix
-	; Bring back rest of the command string from the stack
+	; Bring back command string from DE to HL
-	pop	hl		; <-- lvl 1
+	ex	de, hl
+	ld	a, b	; cmd's length
+	call	addHL
 	call	rdSep
 	jp	(ix)
 
@@ -266,89 +267,6 @@ basINPUT:
 	cp	a		; ensure Z
 	ret
 
-basPEEK:
-	call	basDEEK
-	ret	nz
-	ld	d, 0
-	call	varAssign
-	cp	a		; ensure Z
-	ret
-
-basPOKE:
-	call	rdExpr
-	ret	nz
-	; peek address in IX. Save it for later
-	push	ix		; --> lvl 1
-	call	rdSep
-	call	rdExpr
-	push	ix \ pop hl
-	pop	ix		; <-- lvl 1
-	ret	nz
-	; Poke!
-	ld	(ix), l
-	ret
-
-basDEEK:
-	call	rdExpr
-	ret	nz
-	; peek address in IX. Let's peek and put result in DE
-	ld	e, (ix)
-	ld	d, (ix+1)
-	call	rdSep
-	ld	a, (hl)
-	call	varChk
-	ret	nz		; not in variable range
-	; All good assign
-	call	varAssign
-	cp	a		; ensure Z
-	ret
-
-basDOKE:
-	call	basPOKE
-	ld	(ix+1), h
-	ret
-
-basOUT:
-	call	rdExpr
-	ret	nz
-	; out address in IX. Save it for later
-	push	ix		; --> lvl 1
-	call	rdSep
-	call	rdExpr
-	push	ix \ pop hl
-	pop	bc		; <-- lvl 1
-	ret	nz
-	; Out!
-	out	(c), l
-	cp	a		; ensure Z
-	ret
-
-basIN:
-	call	rdExpr
-	ret	nz
-	push	ix \ pop bc
-	ld	d, 0
-	in	e, (c)
-	call	rdSep
-	ld	a, (hl)
-	call	varChk
-	ret	nz		; not in variable range
-	; All good assign
-	call	varAssign
-	cp	a		; ensure Z
-	ret
-
-basSLEEP:
-	call	rdExpr
-	ret	nz
-	push	ix \ pop hl
-.loop:
-	ld	a, h	; 4T
-	or	l	; 4T
-	ret	z	; 5T
-	dec	hl	; 6T
-	jr	.loop	; 12T
-
 ; direct only
 basCmds1:
 	.dw	basBYE
@@ -367,18 +285,4 @@ basCmds2:
 	.db	"if", 0, 0, 0, 0
 	.dw	basINPUT
 	.db	"input", 0
-	.dw	basPEEK
-	.db	"peek", 0, 0
-	.dw	basPOKE
-	.db	"poke", 0, 0
-	.dw	basDEEK
-	.db	"deek", 0, 0
-	.dw	basDOKE
-	.db	"doke", 0, 0
-	.dw	basOUT
-	.db	"out", 0, 0, 0
-	.dw	basIN
-	.db	"in", 0, 0, 0, 0
-	.dw	basSLEEP
-	.db	"sleep", 0
 	.db	0xff, 0xff, 0xff	; end of table

apps/basic/tok.asm

@@ -32,6 +32,30 @@ rdSep:
 	inc	a	; unset Z
 	ret
 
+; Find the first whitespace in (HL) and returns its index in A
+; Sets Z if whitespace is found, unset if end of string was found.
+; In the case where no whitespace was found, A returns the length of the string.
+fnWSIdx:
+	push	hl
+	push	bc
+	ld	b, 0
+.loop:
+	ld	a, (hl)
+	call	isSep
+	jr	z, .found
+	or	a
+	jr	z, .eos
+	inc	hl
+	inc	b
+	jr	.loop
+.eos:
+	inc	a	; unset Z
+.found:			; Z already set from isSep
+	ld	a, b
+	pop	bc
+	pop	hl
+	ret
+
 ; Advance HL to the next separator or to the end of string.
 toSep:
 	ld	a, (hl)
@@ -61,15 +85,3 @@ rdWord:
 	pop	de
 	pop	af
 	ret
-
-; Read word from HL in SCRATCHPAD and then intepret that word as an expression.
-; Put the result in IX.
-; Z for success.
-rdExpr:
-	ld	de, SCRATCHPAD
-	call	rdWord
-	push	hl
-	ex	de, hl
-	call	parseExpr
-	pop	hl
-	ret

recipes/rc2014/README.md

@@ -27,7 +27,6 @@ are other recipes related to the RC2014:
 * [Accessing a MicroSD card](sdcard/README.md)
 * [Assembling binaries](zasm/README.md)
 * [Interfacing a PS/2 keyboard](ps2/README.md)
-* [Replace shell by a BASIC interpreter](basic/README.md)
 
 ## Recipe
 

recipes/rc2014/basic/Makefile

@@ -1,10 +0,0 @@
-TARGET = os.bin
-ZASM = ../../../tools/zasm.sh
-KERNEL = ../../../kernel
-APPS = ../../../apps
-
-.PHONY: all
-all: $(TARGET)
-$(TARGET): glue.asm
-	$(ZASM) $(KERNEL) $(APPS) < $< > $@
-

recipes/rc2014/basic/README.md

@@ -1,46 +0,0 @@
-# BASIC as a shell
-
-This recipe demonstrate the replacement of the usual shell with the BASIC
-interpreter supplied in Collapse OS. To make things fun, we play with I/Os
-using RC2014's Digital I/O module.
-
-## Gathering parts
-
-* Same parts as in the base recipe
-* (Optional) RC2014's Digital I/O module
-
-The Digital I/O module is only used in the example BASIC code. If you don't
-have the module, just use BASIC in another fashion.
-
-## Build the image
-
-As usual, building `os.bin` is a matter of running `make`. Then, you can get
-that image to your EEPROM like you did in the base recipe.
-
-## Usage
-
-Upon boot, you'll directy be in a BASIC prompt. See documentation in
-`apps/basic/README.md` for details.
-
-For now, let's have some fun with the Digital I/O module. Type this:
-
-```
-> a=0
-> 10 out 0 a
-> 20 sleep 0xffff
-> 30 a=a+1
-> 40 goto 10
-> run
-```
-
-You now have your Digital I/O lights doing a pretty dance, forever.
-
-## Looking at the glue code
-
-If you look at the glue code, you'll see that it's very similar to the one in
-the base recipe, except that the shell includes have been replaced by the basic
-includes. Those includes have been copy/pasted from `apps/basic/glue.asm` and
-`USER_RAMSTART` has been replaced with `STDIO_RAMEND` so that BASIC's memory
-gets placed properly (that is, right after the kernel's memory).
-
-Simple, isn't it?

recipes/rc2014/basic/glue.asm

@@ -1,56 +0,0 @@
-.equ	RAMSTART	0x8000
-.equ	RAMEND		0xffff
-.equ	ACIA_CTL	0x80	; Control and status. RS off.
-.equ	ACIA_IO		0x81	; Transmit. RS on.
-.equ	DIGIT_IO	0x00	; digital I/O's port
-
-jp	init
-
-; interrupt hook
-.fill	0x38-$
-jp	aciaInt
-
-.inc "err.h"
-.inc "ascii.h"
-.inc "core.asm"
-.inc "str.asm"
-.equ	ACIA_RAMSTART	RAMSTART
-.inc "acia.asm"
-
-.equ	STDIO_RAMSTART	ACIA_RAMEND
-.equ	STDIO_GETC	aciaGetC
-.equ	STDIO_PUTC	aciaPutC
-.inc "stdio.asm"
-
-; *** BASIC ***
-
-; RAM space used in different routines for short term processing.
-.equ	SCRATCHPAD_SIZE	0x20
-.equ	SCRATCHPAD	STDIO_RAMEND
-.inc "lib/util.asm"
-.inc "lib/ari.asm"
-.inc "lib/parse.asm"
-.inc "lib/fmt.asm"
-.equ	EXPR_PARSE	parseLiteralOrVar
-.inc "lib/expr.asm"
-.inc "basic/util.asm"
-.inc "basic/parse.asm"
-.inc "basic/tok.asm"
-.equ	VAR_RAMSTART	SCRATCHPAD+SCRATCHPAD_SIZE
-.inc "basic/var.asm"
-.equ	BUF_RAMSTART	VAR_RAMEND
-.inc "basic/buf.asm"
-.equ	BAS_RAMSTART	BUF_RAMEND
-.inc "basic/main.asm"
-
-init:
-	di
-	; setup stack
-	ld	sp, RAMEND
-	im 1
-
-	call	aciaInit
-	ei
-	jp	basStart
-
-