recipes/trs80: use grid module
Not much of a gain in terms of usability (a bit of a loss in fact, things are a bit slow and glitchy), but it's a necessary move if we want to use upcoming grid-enabled userspace apps, such as a visual text editor.
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Virgil Dupras
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a442c46935
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@ -12,8 +12,10 @@
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; can access those cells by their (X, Y) address. In addition to this, we have
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; the concept of an active cursor, which will be indicated visually if possible.
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;
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; Additionally, this module provides a PutC routine, suitable for plugging into
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; stdio.
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; This module provides PutC and GetC routines, suitable for plugging into stdio.
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; PutC, for obvious reasons, GetC, for less obvious reasons: We need to wrap
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; GetC because we need to update the cursor before calling actual GetC, but
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; also, because we need to know when a bulk update ends.
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;
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; *** Defines ***
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;
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@ -21,7 +23,9 @@
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; GRID_ROWS: Number of rows in the grid
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; GRID_SETCELL: Pointer to routine that sets cell at row D and column E with
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; character in A. If C is nonzero, this cell must be displayed,
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; if possible, as the cursor.
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; if possible, as the cursor. This routine is never called with
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; A < 0x20.
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; GRID_GETC: Routine that gridGetC will wrap around.
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;
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; *** Consts ***
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.equ GRID_SIZE GRID_COLS*GRID_ROWS
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@ -31,6 +35,10 @@
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.equ GRID_CURX GRID_RAMSTART
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; Cursor's row
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.equ GRID_CURY @+1
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; Whether we scrolled recently. We don't refresh the screen immediately when
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; scrolling in case we have many lines being spit at once (refreshing the
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; display is then very slow). Instead, we wait until the next gridGetC call
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.equ GRID_SCROLLED @+1
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; Grid's in-memory buffer of the contents on screen. Because we always push to
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; display right after a change, this is almost always going to be a correct
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; representation of on-screen display.
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@ -53,7 +61,7 @@ _gridPlaceCell:
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ld hl, GRID_BUF
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ld a, d
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or a
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ret z
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jr z, .setcol
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push de ; --> lvl 1
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ld de, GRID_COLS
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.loop:
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@ -61,10 +69,18 @@ _gridPlaceCell:
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dec a
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jr nz, .loop
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pop de ; <-- lvl 1
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.setcol:
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; We're at the proper row, now let's advance to cell
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ld a, e
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jp addHL
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; Ensure that A >= 0x20
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_gridAdjustA:
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cp 0x20
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ret nc
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ld a, 0x20
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ret
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; Push row D in the buffer onto the screen.
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gridPushRow:
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push af
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@ -78,6 +94,7 @@ gridPushRow:
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ld b, GRID_COLS
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.loop:
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ld a, (hl)
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call _gridAdjustA
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; A, C, D and E have proper values
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call GRID_SETCELL
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inc hl
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@ -98,11 +115,10 @@ gridClrRow:
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push hl
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ld e, 0
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call _gridPlaceCell
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xor a
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ld a, ' '
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ld b, GRID_COLS
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call fill
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call gridPushRow
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pop hl
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pop de
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pop bc
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@ -131,6 +147,7 @@ gridSetCur:
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call _gridPlaceCell
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pop af \ push af ; <--> lvl 1
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ld (hl), a
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call _gridAdjustA
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call GRID_SETCELL
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pop af ; <-- lvl 1
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pop hl
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@ -166,19 +183,10 @@ gridLF:
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push de
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push af
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ld a, (GRID_CURY)
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call .incA
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ld d, a
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call gridClrRow
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ld (GRID_CURY), a
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xor a
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ld (GRID_CURX), a
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pop af
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pop de
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ret
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.incA:
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; increase A
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inc a
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cp GRID_ROWS
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ret nz ; no rollover
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jr nz, .noscroll
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; bottom reached, stay on last line and scroll screen
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push hl
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push de
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@ -187,11 +195,21 @@ gridLF:
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ld hl, GRID_BUF+GRID_COLS
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ld bc, GRID_SIZE-GRID_COLS
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ldir
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ld hl, GRID_SCROLLED
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inc (hl) ; mark as scrolled
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pop bc
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pop de
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pop hl
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call gridPushScr
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dec a
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.noscroll:
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; A has been increased properly
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ld d, a
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call gridClrRow
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ld (GRID_CURY), a
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xor a
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ld (GRID_CURX), a
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pop af
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pop de
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ret
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gridBS:
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@ -242,3 +260,16 @@ gridPutC:
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call gridLF
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pop af ; <-- lvl 1
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ret
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gridGetC:
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ld a, (GRID_SCROLLED)
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or a
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jr z, .nopush
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; We've scrolled recently, update screen
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xor a
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ld (GRID_SCROLLED), a
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call gridPushScr
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.nopush:
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ld a, ' '
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call gridSetCurH
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jp GRID_GETC
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@ -1,7 +1,9 @@
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; vid - TRS-80's video
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;
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; Implement PutC using TRS-80's SVC calls so that character it put on video
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; display.
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; Implement PutC and GRID_SETCELL using TRS-80's SVC calls.
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.equ TRS80_COLS 80
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.equ TRS80_ROWS 24
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trs80PutC:
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push af
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@ -14,3 +16,44 @@ trs80PutC:
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pop bc
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pop af
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ret
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trs80SetCell:
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push af
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push bc
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push hl ; HL altered by @VDCTL
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push de ; DE altered by @VDCTL
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ex de, hl
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bit 0, c
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ld c, a ; save A now
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jr z, .skip ; Z from BIT above. cursor not set
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; set cursor
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ld a, 0x0f ; @VDCTL
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ld b, 3 ; move cursor fn
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rst 0x28
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; HL altered.
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; Our Row/Col is our currently-pushed DE value. Let's take advantage of
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; that.
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pop hl \ push hl ; HL altered. bring back from stack
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.skip:
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ld a, 0x0f ; @VDCTL
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ld b, 2 ; display char
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rst 0x28
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pop de
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pop hl
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pop bc
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pop af
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ret
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; This is a much faster version of gridPushScr. Use it in your glue code, but
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; you need to set HL to GRID_BUF first.
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trs80PushScr:
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push af
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push bc
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ld a, 0x0f ; @VDCTL
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ld b, 5 ; move from RAM to vid
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; HL is already set by caller
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rst 0x28
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pop bc
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pop af
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cp a ; ensure Z
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ret
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@ -21,10 +21,11 @@
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.equ GRID_COLS VDP_COLS
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.equ GRID_ROWS VDP_ROWS
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.equ GRID_SETCELL vdpSetCell
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.equ GRID_GETC padGetC
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.inc "grid.asm"
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.equ STDIO_RAMSTART GRID_RAMEND
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.equ STDIO_GETC padGetC
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.equ STDIO_GETC gridGetC
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.equ STDIO_PUTC gridPutC
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.inc "stdio.asm"
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@ -2,17 +2,13 @@
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.equ RAMEND 0xcfff
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; Address of the *CL driver. Same as in recv.asm
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.equ COM_DRV_ADDR 0x0238
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; in sync with user.h. Last BAS_RAMEND: 0x5705
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.equ USER_CODE 0x5800
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; in sync with user.h. Last BAS_RAMEND: 0x600b
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.equ USER_CODE 0x6100
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; Free memory in TRSDOS starts at 0x3000
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.org 0x3000
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jp init
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; The TRS-80 generates a double line feed if we give it both CR and LF.
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; Has to be defined before the jump table.
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.equ printcrlf printcr
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; *** Jump Table ***
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jp strncmp
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jp upcase
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@ -45,7 +41,14 @@
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.equ FLOPPY_RAMSTART RAMSTART
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.inc "trs80/floppy.asm"
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.equ BLOCKDEV_RAMSTART FLOPPY_RAMEND
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.equ GRID_RAMSTART FLOPPY_RAMEND
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.equ GRID_ROWS TRS80_ROWS
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.equ GRID_COLS TRS80_COLS
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.equ GRID_SETCELL trs80SetCell
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.equ GRID_GETC trs80GetC
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.equ gridPushScr fastPushScr
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.inc "grid.asm"
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.equ BLOCKDEV_RAMSTART GRID_RAMEND
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.equ BLOCKDEV_COUNT 3
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.inc "blockdev.asm"
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; List of devices
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@ -54,8 +57,9 @@
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.dw blk2GetB, blk2PutB
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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.equ STDIO_GETC trs80GetC
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.equ STDIO_PUTC trs80PutC
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.equ STDIO_GETC gridGetC
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.equ STDIO_PUTC gridPutC
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.equ STDIO_SETCUR gridSetCurH
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.inc "stdio.asm"
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.equ FS_RAMSTART STDIO_RAMEND
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@ -91,6 +95,7 @@
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init:
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ld sp, RAMEND
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call gridInit
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call floppyInit
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call fsInit
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call basInit
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@ -103,13 +108,6 @@ init:
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jp basStart
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printcr:
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push af
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ld a, CR
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call STDIO_PUTC
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pop af
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ret
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; Receive a byte from *cl and put it in A.
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; Returns A > 0xff when receiving the last byte
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recvCmd:
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@ -172,6 +170,13 @@ basFindCmdExtra:
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.dw recvCmd
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.db 0xff ; end of table
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fastPushScr:
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push hl
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ld hl, GRID_BUF
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call trs80PushScr
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pop hl
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ret
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; *** blkdev 1: file handle 0 ***
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blk1GetB:
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@ -1,4 +1,4 @@
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.org 0x5800
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.org 0x6100
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.equ strncmp 0x3003
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.equ upcase @+3
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.equ findchar @+3
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