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small performance optimization, fix for keyboard scanner variables optimization

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FeralChild64 committed 2020-12-04 16:56:57 +01:00
1 parent 5c8ac04083
commit c7f9f0ae34
2 files changed
+22 -18
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src/aliases/,aliases_ram_lowmem_m65.s
+2 -3
View File
@@ -55,12 +55,11 @@
!addr M65_SCRCOLMAX = $594 ; maximum allowed column
!addr M65_KB_BUCKY = $595 ; result of bucky keys scan
!addr M65_KB_COLSCAN = $596 ; $596-$59E results of keyboard scan, columns 0-8
!addr M65_KB_COLSUM = $59F ; sum (OR) of the M65_KB_COLSCAN
!addr M65_JOYCRSR = $59F ; joystick to be used for cursor movement
!addr M65_KB_PRESSED = $560 ; $560-$562 keys pressed, used during scanning keyboard
!addr M65_KB_PRESSED_OLD = $563 ; $563-$565 keys pressed during previous scan
!addr M65_KB_PRESSED_NEW = $566 ; $566-$568 set of M65_KB_PRESSED minus M65_KB_PRESSED_OLD
!addr M65_JOYCRSR = $569 ; joystick to be used for cursor movement
; $56A-$5EB -- UNUSED --
; $569-$5EB -- UNUSED --
!addr M65_DMAGIC_LIST = $5F1 ; $5EF-$5FF reserved for DMAgic list, 15 bytes (modulo bytes are not needed)
!addr M65_RS232_INBUF = $600 ; $600-$6FF -- reserved for RS-232 input buffer --
!addr M65_RS232_OUTBUF = $700 ; $700-$7FF -- reserved for RS-232 output buffer --
src/kernal/keyboard_m65/mega65_scnkey.s
+20 -15
View File
@@ -4,13 +4,21 @@
m65_scnkey:
; Initialize work variables for scanning the keyboard
lda M65_KB_PRESSED+0
sta M65_KB_PRESSED_OLD+0
lda M65_KB_PRESSED+1
sta M65_KB_PRESSED_OLD+1
lda M65_KB_PRESSED+2
sta M65_KB_PRESSED_OLD+2
jsr m65_scnkey_init_pressed
;
; Scan the whole keyboard, store results in memory
;
lda #$00
sta M65_KB_COLSUM
ldx #$08
lda #%01111111
@@ -25,8 +33,6 @@ m65_scnkey_fetch_loop:
lda KBSCN_PEEK
eor #$FF ; let bit 1 mean 'pressed', not the otherwise
sta M65_KB_COLSCAN, x
ora M65_KB_COLSUM
sta M65_KB_COLSUM
dex
bpl m65_scnkey_fetch_loop
@@ -80,16 +86,15 @@ m65_scnkey_keytab_set_done:
; Scan the keyboard matrix stored in memory to determine which keys were pressed
;
lda M65_KB_PRESSED+0
sta M65_KB_PRESSED_OLD+0
lda M65_KB_PRESSED+1
sta M65_KB_PRESSED_OLD+1
lda M65_KB_PRESSED+2
sta M65_KB_PRESSED_OLD+2
jsr m65_scnkey_init_pressed
lda M65_KB_COLSUM
lda M65_KB_COLSCAN+0 ; no loop here - for performance purposes
ora M65_KB_COLSCAN+1
ora M65_KB_COLSCAN+2
ora M65_KB_COLSCAN+3
ora M65_KB_COLSCAN+4
ora M65_KB_COLSCAN+5
ora M65_KB_COLSCAN+6
ora M65_KB_COLSCAN+7
ora M65_KB_COLSCAN+8
beq m65_scnkey_try_joystick ; branch if no key was pressed
ldx #$08