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another keyboard code optimization

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FeralChild64 committed 2020-12-04 17:41:26 +01:00
1 parent d01c7e8ac9
commit 22936314fe
1 file changed
+9 -8
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src/kernal/keyboard_m65/mega65_scnkey.s
+9 -8
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@@ -88,6 +88,7 @@ m65_scnkey:
stx SHFLAG ; .X is $00 here stx SHFLAG ; .X is $00 here
lda M65_KB_BUCKY lda M65_KB_BUCKY
beq m65_scnkey_bucky_done
dex ; index into kb_matrix_bucky_shflag dex ; index into kb_matrix_bucky_shflag
; FALLTROUGH ; FALLTROUGH
@@ -96,22 +97,22 @@ m65_scnkey_bucky_loop:
inx inx
asr ; ASR preserves most significant bit, but in our case it is 0 asr ; ASR preserves most significant bit, but in our case it is 0
bcc m65_scnkey_bucky_next bcc @1
; Bucky key pressed ; Bucky key pressed
pha tay
lda kb_matrix_bucky_shflag, x lda kb_matrix_bucky_shflag, x
ora SHFLAG ora SHFLAG
sta SHFLAG sta SHFLAG
pla tya
@1:
; FALLTROUGH
m65_scnkey_bucky_next:
bne m65_scnkey_bucky_loop bne m65_scnkey_bucky_loop
; FALLTROUGH
m65_scnkey_bucky_done:
; Set KEYTAB vector ; Set KEYTAB vector
lda KEYLOG+1 lda KEYLOG+1