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videogamepreservation
/
alienbashii
mirror of https://github.com/videogamepreservation/alienbashii
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alienbashii
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Code
/
maptool
/
glens_code
/
keyboard_reader.s

keyboard_reader.s 1.7 KB
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  1. KEY_SHIFT1	EQU	30
    2. 

  2. KEY_SHIFT2	EQU	31
    3. 

  3. 

  4. KEY_RETURN	EQU	59-63
    5. 

  5. KEY_DELETE	EQU	62-63
    6. 

  6. CURSOR_UP	EQU	51-63
    7. 

  7. CURSOR_DOWN	EQU	50-63
    8. 

  8. CURSOR_LEFT	EQU	48-63
    9. 

  9. CURSOR_RIGHT	EQU	49-63
    10. 

  10. F1_KEY		EQU	47-63
    11. 

  11. F2_KEY		EQU	46-63
    12. 

  12. F3_KEY		EQU	45-63
    13. 

  13. F4_KEY		EQU	44-63
    14. 

  14. F5_KEY		EQU	43-63
    15. 

  15. F6_KEY		EQU	42-63
    16. 

  16. F7_KEY		EQU	41-63
    17. 

  17. F8_KEY		EQU	40-63
    18. 

  18. 

  19. ************************************************
    20. 

  20. ** KEYBOARD READING ROUTINE                   **
    21. 

  21. ************************************************
    22. 

  22. Read_Keyboard
    23. 

  23. 	clr.l	d0
    24. 

  24. 	move.b	$bfec01,d0
    25. 

  25. 	ror.b	d0
    26. 

  26. 	btst.l	#7,d0
    27. 

  27. 	beq.s	Key_Not_Pressed
    28. 

  28. 	andi.b	#$7f,d0
    29. 

  29. 	tst.w	Key_Status
    30. 

  30. 	beq.s	User_Key_Pressed
    31. 

  31. 	cmp.w	Last_Key,d0
    32. 

  32. 	bne.s	User_Key_Pressed
    33. 

  33. 	moveq.l	#0,d0
    34. 

  34. 	rts
    35. 

  35. Key_Not_Pressed
    36. 

  36. 	cmp.w	#KEY_SHIFT1,d0
    37. 

  37. 	beq.s	Shift_Released
    38. 

  38. 	cmp.w	#KEY_SHIFT2,d0
    39. 

  39. 	bne.s	Not_Shift_Released
    40. 

  40. Shift_Released
    41. 

  41. 	clr.w	Shift_Down		
    42. 

  42. Not_Shift_Released	
    43. 

  43. 	clr.w	Key_Status	
    44. 

  44. 	moveq.l	#0,d0
    45. 

  45. 	rts
    46. 

  46. User_Key_Pressed
    47. 

  47. 	cmp.w	#KEY_SHIFT1,d0
    48. 

  48. 	beq.s	Shift_Pressed
    49. 

  49. 	cmp.w	#KEY_SHIFT2,d0
    50. 

  50. 	bne.s	Not_Shift_Pressed
    51. 

  51. Shift_Pressed	
    52. 

  52. 	move.w	#1,Shift_Down
    53. 

  53. 	clr.l	d0
    54. 

  54. 	rts
    55. 

  55. Not_Shift_Pressed	
    56. 

  56. 	move.w	d0,Last_Key
    57. 

  57. 	move.w	#1,Key_Status	;key has been pressed	
    58. 

  58. 	
    59. 

  59. *convert Key code
    60. 

  60. 	cmp.w	#126,d0
    61. 

  61. 	bgt.s	Not_Char_Key
    62. 

  62. key_in_range	
    63. 

  63. 	sub.w	#63,d0	;start from 0	
    64. 

  64. 	blt.s	Not_Char_Key
    65. 

  65. 	tst.w	Shift_Down
    66. 

  66. 	beq.s	Choose_Shift_Up_Chars
    67. 

  67. 	move.l	#Chars_With_Shift,a0
    68. 

  68. 	bra.s	Get_Key_Char
    69. 

  69. Choose_Shift_Up_Chars
    70. 

  70. 	move.l	#Chars_No_Shift,a0	
    71. 

  71. Get_Key_Char	
    72. 

  72. 	move.b	(a0,d0),d0
    73. 

  73. 	rts
    74. 

  74. Not_Char_Key		
    75. 

  75. 	rts
    76. 

  76. 	
    77. 

  77. Shift_Down
    78. 

  78. 	dc.w	0
    79. 

  79. Key_Status
    80. 

  80. 	dc.w	0	
    81. 

  81. Last_Key
    82. 

  82. 	dc.w	0
    83. 

  83. 	
    84. 

  84. 	
    85. 

  85. Chars_No_Shift
    86. 

  86. 	dc.b	"      /.,mnbvcxz"	;63-78
    87. 

  87. 	dc.b	"      ';lkjhgfds"	;79-94
    88. 

  88. 	dc.b	"a      poiuytrew"	;95-110
    89. 

  89. 	dc.b	"q  \=-0987654321"	;111-126		
    90. 

  90. 	
    91. 

  91. Chars_With_Shift
    92. 

  92. 	dc.b	"      ?><MNBVCXZ"
    93. 

  93. 	dc.b    "       :LKJHGFDS"
    94. 

  94. 	dc.b	"A      POIUYTREW"
    95. 

  95. 	dc.b	"Q  |+_)(*&^%$#@!"	
    96.