112 lines
2.4 KiB
ArmAsm
112 lines
2.4 KiB
ArmAsm
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;==========================================================
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; Wait until keypressed
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;==========================================================
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;
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wait_until_keypressed:
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lda KEYPRESS ; check if keypressed
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bpl wait_until_keypressed ; if not, loop
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jmp figure_out_key
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;==========================================================
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; Get Key
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;==========================================================
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;
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get_key:
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check_paddle_button:
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; check for paddle button
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bit PADDLE_BUTTON0 ; 4
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bpl no_button ; 2nt/3
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lda #' '+128 ; 2
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jmp save_key ; 3
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no_button:
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lda KEYPRESS ; 3
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bpl no_key ; 2nt/3
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figure_out_key:
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cmp #' '+128 ; the mask destroys space ; 2
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beq save_key ; so handle it specially ; 2nt/3
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and #$5f ; mask, to make upper-case ; 2
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check_right_arrow:
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cmp #$15 ; 2
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bne check_left_arrow ; 2nt/3
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lda #'D' ; 2
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check_left_arrow:
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cmp #$08 ; 2
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bne check_up_arrow ; 2nt/3
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lda #'A' ; 2
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check_up_arrow:
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cmp #$0B ; 2
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bne check_down_arrow ; 2nt/3
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lda #'W' ; 2
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check_down_arrow:
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cmp #$0A ; 2
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bne check_escape ; 2nt/3
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lda #'S' ; 2
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check_escape:
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cmp #$1B ; 2
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bne save_key ; 2nt/3
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lda #'Q' ; 2
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jmp save_key ; 3
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no_key:
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bit PADDLE_STATUS ; 3
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bpl no_key_store ; 2nt/3
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; check for paddle action
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; code from http://web.pdx.edu/~heiss/technotes/aiie/tn.aiie.06.html
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inc PADDLE_STATUS ; 5
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lda PADDLE_STATUS ; 3
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and #$03 ; 2
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beq check_paddles ; 2nt/3
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jmp no_key_store ; 3
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check_paddles:
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lda PADDLE_STATUS ; 3
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and #$80 ; 2
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sta PADDLE_STATUS ; 3
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ldx #$0 ; 2
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LDA PTRIG ;TRIGGER PADDLES ; 4
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LDY #0 ;INIT COUNTER ; 2
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NOP ;COMPENSATE FOR 1ST COUNT ; 2
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NOP ; 2
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PREAD2: LDA PADDL0,X ;COUNT EVERY 11 uSEC. ; 4
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BPL RTS2D ;BRANCH WHEN TIMED OUT ; 2nt/3
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INY ;INCREMENT COUNTER ; 2
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BNE PREAD2 ;CONTINUE COUNTING ; 2nt/3
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DEY ;COUNTER OVERFLOWED ; 2
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RTS2D: ;RETURN W/VALUE 0-255
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cpy #96 ; 2
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bmi paddle_left ; 2nt/3
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cpy #160 ; 2
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bmi no_key_store ; 2nt/3
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lda #'D' ; 2
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jmp save_key ; 3
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paddle_left:
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lda #'A' ; 2
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jmp save_key ; 3
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no_key_store:
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lda #0 ; no key, so save a zero ; 2
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save_key:
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sta LASTKEY ; save the key to our buffer ; 2
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bit KEYRESET ; clear the keyboard buffer ; 4
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rts ; 6
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;============
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; 33=nokey
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; 48=worstkey
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