Skip to content

Added option to use NMI for IRQ #3

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
danielg4 wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Added option to use NMI for IRQ #3

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
18 changes: 17 additions & 1 deletion Code/hardware.asm
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -67,11 +67,18 @@ resetuart:
setupirq:
sei

ifnconst USE_NMI
; Point to my interrupt vector
lda #<theirq
sta $0314
lda #>theirq
sta $0315
else
lda #<thenmi
sta $0318
lda #>thenmi
sta $0319
eif

; Disable timer interrupts

Expand All @@ -86,6 +93,15 @@ setupirq:
; ----------------------------------------------------------------------------
; The IRQ.

thenmi:
ifconst USE_NMI
pha
txa
pha
tya
pha
eif

theirq:
; Fetch the received byte
lda UART_RXTX ;get data
Expand Down Expand Up @@ -114,4 +130,4 @@ nouart:
byte 127,127, " uart NOT FOUND! ", 127,127
byte 0

; EOF!
; EOF!
5 changes: 5 additions & 0 deletions Code/keyboard.asm
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -122,6 +122,8 @@ ReadKey:
lda #$00
sta midinoteout

dec screen_colors

key_x:
rts

Expand All @@ -136,9 +138,12 @@ keypressed: ; A contains key code
beq key_x ; Yes, do nothing

; New note - send it

sta midinoteout
jsr sendnoteon

inc screen_colors

rts


Expand Down
4 changes: 4 additions & 0 deletions Code/make-nmi.cmd
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,4 @@
@cls
@del *.prg
@tools\dasm vicmidi.asm -ovicmidi-nmi.prg -lvicmidi-nmi.list -DUSE_NMI
@copy vicmidi-nmi.prg e:\
Binary file added Code/tools/dasm
View file
Open in desktop
Binary file not shown.
Binary file added Code/tools/dasm-new
View file
Open in desktop
Binary file not shown.
Binary file added Code/tools/dasm-new.exe
View file
Open in desktop
Binary file not shown.
3,586 changes: 3,586 additions & 0 deletions Code/vicmidi-nmi.list
View file
Open in desktop

Large diffs are not rendered by default.

Binary file added Code/vicmidi-nmi.prg
View file
Open in desktop
Binary file not shown.
112 changes: 64 additions & 48 deletions Code/vicmidi.list
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1191,54 +1191,70 @@
67 a59f setupirq
68 a59f 78 sei
69 a5a0
70 a5a0 ; Point to my interrupt vector
71 a5a0 a9 b4 lda #<theirq
72 a5a2 8d 14 03 sta $0314
73 a5a5 a9 a5 lda #>theirq
74 a5a7 8d 15 03 sta $0315
75 a5aa
76 a5aa ; Disable timer interrupts
77 a5aa
78 a5aa a9 60 lda #%01100000
79 a5ac 8d 2e 91 sta $912e ; disable and acknowledge interrupts
80 a5af 8d 2d 91 sta $912d
81 a5b2 ;sta $911e ; disable NMIs (Restore key)
82 a5b2
83 a5b2 58 cli
84 a5b3 60 rts
85 a5b4
86 a5b4 ; ----------------------------------------------------------------------------
87 a5b4 ; The IRQ.
88 a5b4
89 a5b4 theirq
90 a5b4 ; Fetch the received byte
91 a5b4 ad 00 9c lda UART_RXTX ;get data
92 a5b7 a4 5c ldy write_pointer
93 a5b9 99 00 12 sta buffer,y
94 a5bc e6 5c inc write_pointer
95 a5be
96 a5be ; Clear the interrupt from the UART by reading the status register
97 a5be ad 02 9c lda UART_ISR
98 a5c1
99 a5c1 4c 56 ff jmp $ff56 ; Use this in place of rti because it restores the A,X,Y registers from the stack
100 a5c4 ;jmp $eabf ; return to normal IRQ (scans keyboard and stuff)
101 a5c4
102 a5c4
103 a5c4 ; ----------------------------------------------------------------------------
104 a5c4 ; Handle the RESTORE key
105 a5c4
106 a5c4 RESTORE
107 a5c4 4c c7 fe jmp $fec7 ; Continue as if no cartridge installed
108 a5c7
109 a5c7
110 a5c7 ; ----------------------------------------------------------------------------
111 a5c7 ; Strings
112 a5c7
113 a5c7 nouart
114 a5c7 7f 7f 20 75* byte.b 127,127, " uart NOT FOUND! ", 127,127
115 a5dc 00 byte.b 0
116 a5dd
117 a5dd ; EOF!
70 a5a0 ifnconst USE_NMI
71 a5a0 ; Point to my interrupt vector
72 a5a0 a9 b4 lda #<theirq
73 a5a2 8d 14 03 sta $0314
74 a5a5 a9 a5 lda #>theirq
75 a5a7 8d 15 03 sta $0315
76 a5aa - else
77 a5aa - lda #<thenmi
78 a5aa - sta $0318
79 a5aa - lda #>thenmi
80 a5aa - sta $0319
81 a5aa eif
82 a5aa
83 a5aa ; Disable timer interrupts
84 a5aa
85 a5aa a9 60 lda #%01100000
86 a5ac 8d 2e 91 sta $912e ; disable and acknowledge interrupts
87 a5af 8d 2d 91 sta $912d
88 a5b2 ;sta $911e ; disable NMIs (Restore key)
89 a5b2
90 a5b2 58 cli
91 a5b3 60 rts
92 a5b4
93 a5b4 ; ----------------------------------------------------------------------------
94 a5b4 ; The IRQ.
95 a5b4
96 a5b4 thenmi
97 a5b4 - ifconst USE_NMI
98 a5b4 - pha
99 a5b4 - txa
100 a5b4 - pha
101 a5b4 - tya
102 a5b4 - pha
103 a5b4 eif
104 a5b4
105 a5b4 theirq
106 a5b4 ; Fetch the received byte
107 a5b4 ad 00 9c lda UART_RXTX ;get data
108 a5b7 a4 5c ldy write_pointer
109 a5b9 99 00 12 sta buffer,y
110 a5bc e6 5c inc write_pointer
111 a5be
112 a5be ; Clear the interrupt from the UART by reading the status register
113 a5be ad 02 9c lda UART_ISR
114 a5c1
115 a5c1 4c 56 ff jmp $ff56 ; Use this in place of rti because it restores the A,X,Y registers from the stack
116 a5c4 ;jmp $eabf ; return to normal IRQ (scans keyboard and stuff)
117 a5c4
118 a5c4
119 a5c4 ; ----------------------------------------------------------------------------
120 a5c4 ; Handle the RESTORE key
121 a5c4
122 a5c4 RESTORE
123 a5c4 4c c7 fe jmp $fec7 ; Continue as if no cartridge installed
124 a5c7
125 a5c7
126 a5c7 ; ----------------------------------------------------------------------------
127 a5c7 ; Strings
128 a5c7
129 a5c7 nouart
130 a5c7 7f 7f 20 75* byte.b 127,127, " uart NOT FOUND! ", 127,127
131 a5dc 00 byte.b 0
132 a5dd
133 a5dd ; EOF!
------- FILE vicmidi.asm
------- FILE utils.asm LEVEL 2 PASS 2
0 a5dd include "utils.asm"
Expand Down
Loading