[41] | 1 | ; File name : Keyboard.asm |
---|
| 2 | ; Project name : Assembly Library |
---|
| 3 | ; Created date : 5.7.2010 |
---|
[54] | 4 | ; Last update : 24.10.2010 |
---|
[41] | 5 | ; Author : Tomi Tilli |
---|
| 6 | ; Description : Functions for managing keyboard. |
---|
| 7 | |
---|
| 8 | BUFFER_SIZE_FOR_WORD_INPUT EQU 6 ; 5 chars + NULL |
---|
| 9 | |
---|
| 10 | ; Section containing code |
---|
| 11 | SECTION .text |
---|
| 12 | |
---|
| 13 | ;-------------------------------------------------------------------- |
---|
| 14 | ; Reads user inputted word. |
---|
| 15 | ; Function returns when ENTER or ESC will be pressed. |
---|
| 16 | ; |
---|
| 17 | ; Keyboard_ReadUserInputtedWordWhilePrinting |
---|
| 18 | ; Parameters |
---|
| 19 | ; BX: Numeric base (10 or 16) |
---|
| 20 | ; Returns: |
---|
| 21 | ; AX: User inputted word |
---|
| 22 | ; ZF: Set if user cancellation |
---|
| 23 | ; Corrupts registers: |
---|
| 24 | ; DX |
---|
| 25 | ;-------------------------------------------------------------------- |
---|
| 26 | ALIGN JUMP_ALIGN |
---|
| 27 | Keyboard_ReadUserInputtedWordWhilePrinting: |
---|
[52] | 28 | push ds |
---|
| 29 | push si |
---|
[41] | 30 | push cx |
---|
| 31 | |
---|
[52] | 32 | mov cx, BUFFER_SIZE_FOR_WORD_INPUT |
---|
| 33 | call Memory_ReserveCXbytesFromStackToDSSI |
---|
[41] | 34 | |
---|
| 35 | call Char_GetFilterFunctionToDXforNumericBaseInBX |
---|
[54] | 36 | call Registers_ExchangeDSSIwithESDI |
---|
[41] | 37 | call Keyboard_ReadUserInputtedStringToESDIWhilePrinting |
---|
[54] | 38 | call Registers_ExchangeDSSIwithESDI ; Does not modify FLAGS |
---|
[52] | 39 | jz SHORT .CancelledByUser |
---|
[41] | 40 | |
---|
| 41 | call String_ConvertWordToAXfromStringInDSSIwithBaseInBX |
---|
[52] | 42 | .CancelledByUser: |
---|
| 43 | add sp, BYTE BUFFER_SIZE_FOR_WORD_INPUT |
---|
[54] | 44 | test cx, cx ; Set ZF if string length is zero |
---|
[41] | 45 | pop cx |
---|
[52] | 46 | pop si |
---|
| 47 | pop ds |
---|
[41] | 48 | ret |
---|
| 49 | |
---|
| 50 | |
---|
| 51 | ;-------------------------------------------------------------------- |
---|
| 52 | ; Reads user inputted string to buffer. Character filter is |
---|
| 53 | ; supported to ignore unwanted characters. |
---|
| 54 | ; Function returns when ENTER or ESC will be pressed. |
---|
| 55 | ; |
---|
| 56 | ; Keyboard_ReadUserInputtedStringToESDIWhilePrinting |
---|
| 57 | ; Parameters: |
---|
| 58 | ; CX: Buffer size (with NULL) |
---|
| 59 | ; ES:DI: Ptr to destination buffer |
---|
| 60 | ; CS:DX: Ptr to character filter function: |
---|
| 61 | ; Parameters: |
---|
| 62 | ; AL: Character inputted by user |
---|
| 63 | ; Returns: |
---|
| 64 | ; CF: Set if character is accepted |
---|
| 65 | ; Cleared if character is rejected |
---|
| 66 | ; Corrupts registers: |
---|
| 67 | ; Nothing |
---|
| 68 | ; Returns: |
---|
| 69 | ; CX: String length in characters (without NULL) |
---|
| 70 | ; ZF: Set if user cancellation |
---|
| 71 | ; Corrupts registers: |
---|
| 72 | ; AX |
---|
| 73 | ;-------------------------------------------------------------------- |
---|
| 74 | ALIGN JUMP_ALIGN |
---|
| 75 | Keyboard_ReadUserInputtedStringToESDIWhilePrinting: |
---|
| 76 | push di |
---|
| 77 | push si |
---|
| 78 | push bx |
---|
| 79 | call .PrepareDisplayContextForKeyboardInput |
---|
| 80 | jcxz .ReturnAfterUpdatingZF |
---|
| 81 | |
---|
| 82 | xor bx, bx ; Zero character counter |
---|
| 83 | dec cx ; Decrement buffer size for NULL |
---|
| 84 | cld |
---|
| 85 | ALIGN JUMP_ALIGN |
---|
| 86 | .GetCharacterFromUser: |
---|
| 87 | call Keyboard_GetKeystrokeToAXandWaitIfNecessary ; Get ASCII to AL |
---|
| 88 | call .ProcessControlCharacter |
---|
| 89 | jz SHORT .TerminateStringWithNULL |
---|
| 90 | jc SHORT .PlayBellForRejectedCharacter |
---|
| 91 | call dx ; Filter character |
---|
| 92 | jnc SHORT .PlayBellForRejectedCharacter |
---|
| 93 | inc bx ; Increment number of characters stored |
---|
| 94 | stosb ; Store from AL to ES:DI |
---|
| 95 | call Keyboard_PrintInputtedCharacter |
---|
| 96 | loop .GetCharacterFromUser |
---|
| 97 | .PlayBellForRejectedCharacter: |
---|
[48] | 98 | cmp al, BS ; No bell for backspace |
---|
| 99 | je SHORT .GetCharacterFromUser |
---|
[41] | 100 | call Keyboard_PlayBellForUnwantedKeystroke |
---|
| 101 | jmp SHORT .GetCharacterFromUser |
---|
| 102 | |
---|
| 103 | .TerminateStringWithNULL: |
---|
| 104 | stosb ; Terminate string with NULL |
---|
| 105 | mov cx, bx ; String length now in CX |
---|
| 106 | |
---|
| 107 | .ReturnAfterUpdatingZF: |
---|
| 108 | CALL_DISPLAY_LIBRARY PopDisplayContext |
---|
| 109 | test cx, cx ; Clear or set ZF |
---|
| 110 | pop bx |
---|
| 111 | pop si |
---|
| 112 | pop di |
---|
| 113 | ret |
---|
| 114 | |
---|
| 115 | ;-------------------------------------------------------------------- |
---|
| 116 | ; .PrepareDisplayContextForKeyboardInput |
---|
| 117 | ; Parameters: |
---|
| 118 | ; Nothing |
---|
| 119 | ; Returns: |
---|
| 120 | ; Nothing (Display context pushed to stack) |
---|
| 121 | ; Corrupts registers: |
---|
| 122 | ; AX, BX, SI |
---|
| 123 | ;-------------------------------------------------------------------- |
---|
| 124 | ALIGN JUMP_ALIGN |
---|
| 125 | .PrepareDisplayContextForKeyboardInput: |
---|
| 126 | pop bx ; Pop return address to BX |
---|
| 127 | mov si, di |
---|
| 128 | |
---|
| 129 | CALL_DISPLAY_LIBRARY PushDisplayContext |
---|
| 130 | mov ax, CURSOR_NORMAL |
---|
| 131 | CALL_DISPLAY_LIBRARY SetCursorShapeFromAX |
---|
| 132 | CALL_DISPLAY_LIBRARY SynchronizeDisplayContextToHardware |
---|
| 133 | |
---|
| 134 | mov di, si |
---|
| 135 | jmp bx |
---|
| 136 | |
---|
| 137 | |
---|
| 138 | ;-------------------------------------------------------------------- |
---|
| 139 | ; .ProcessControlCharacter |
---|
| 140 | ; Parameters: |
---|
| 141 | ; AL: Character inputted by user |
---|
| 142 | ; CX: Number of bytes left in buffer |
---|
| 143 | ; BX: Total number of characters inputted |
---|
| 144 | ; ES:DI: Ptr where to store next character |
---|
| 145 | ; Returns: |
---|
| 146 | ; AL: Character inputted by user or NULL if end of input |
---|
| 147 | ; BX: Cleared if user cancellation |
---|
| 148 | ; ZF: Set if user has ended or cancelled key input |
---|
| 149 | ; CF: Set if character is rejected |
---|
| 150 | ; Corrupts registers: |
---|
| 151 | ; AH |
---|
| 152 | ;-------------------------------------------------------------------- |
---|
| 153 | ALIGN JUMP_ALIGN |
---|
| 154 | .ProcessControlCharacter: |
---|
| 155 | cmp al, CR ; ENTER to terminate string? |
---|
| 156 | je SHORT .EndCharacterInput |
---|
| 157 | cmp al, ESC ; Cancel input? |
---|
| 158 | je SHORT .CancelCharacterInput |
---|
| 159 | cmp al, BS ; Backspace? |
---|
| 160 | je SHORT .Backspace |
---|
| 161 | jcxz .RejectCharacter |
---|
| 162 | test al, al ; Clear ZF and CF |
---|
| 163 | ret |
---|
| 164 | |
---|
| 165 | .Backspace: |
---|
| 166 | test bx, bx ; At the beginning? |
---|
| 167 | jz SHORT .RejectCharacter |
---|
| 168 | inc cx ; Increment bytes left |
---|
| 169 | dec bx ; Decrement characters inputted |
---|
| 170 | dec di |
---|
| 171 | call Keyboard_PrintBackspace |
---|
[48] | 172 | mov al, BS ; Restore character |
---|
[41] | 173 | .RejectCharacter: |
---|
| 174 | test al, al ; Clear ZF... |
---|
| 175 | stc ; ...and set CF |
---|
| 176 | ret |
---|
| 177 | |
---|
| 178 | .CancelCharacterInput: |
---|
| 179 | xor bx, bx |
---|
| 180 | .EndCharacterInput: |
---|
| 181 | xor al, al ; Set ZF and clear CF |
---|
| 182 | ret |
---|
| 183 | |
---|
| 184 | |
---|
| 185 | ;-------------------------------------------------------------------- |
---|
| 186 | ; Keyboard_PrintBackspace |
---|
| 187 | ; Parameters: |
---|
| 188 | ; Nothing |
---|
| 189 | ; Returns: |
---|
| 190 | ; Nothing |
---|
| 191 | ; Corrupts registers: |
---|
| 192 | ; AX |
---|
| 193 | ;-------------------------------------------------------------------- |
---|
| 194 | ALIGN JUMP_ALIGN |
---|
| 195 | Keyboard_PrintBackspace: |
---|
| 196 | mov al, BS |
---|
| 197 | call Keyboard_PrintInputtedCharacter |
---|
| 198 | mov al, ' ' |
---|
| 199 | call Keyboard_PrintInputtedCharacter |
---|
| 200 | mov al, BS |
---|
| 201 | jmp SHORT Keyboard_PrintInputtedCharacter |
---|
| 202 | |
---|
| 203 | |
---|
| 204 | ;-------------------------------------------------------------------- |
---|
| 205 | ; Keyboard_PlayBellForUnwantedKeystroke |
---|
| 206 | ; Parameters: |
---|
| 207 | ; Nothing |
---|
| 208 | ; Returns: |
---|
| 209 | ; Nothing |
---|
| 210 | ; Corrupts registers: |
---|
| 211 | ; AX |
---|
| 212 | ;-------------------------------------------------------------------- |
---|
| 213 | ALIGN JUMP_ALIGN |
---|
| 214 | Keyboard_PlayBellForUnwantedKeystroke: |
---|
| 215 | mov al, BELL |
---|
| 216 | ; Fall to Keyboard_PrintInputtedCharacter |
---|
| 217 | |
---|
| 218 | ;-------------------------------------------------------------------- |
---|
| 219 | ; Keyboard_PrintInputtedCharacter |
---|
| 220 | ; Parameters: |
---|
| 221 | ; AL: Character inputted by user |
---|
| 222 | ; Returns: |
---|
| 223 | ; Nothing |
---|
| 224 | ; Corrupts registers: |
---|
| 225 | ; AX |
---|
| 226 | ;-------------------------------------------------------------------- |
---|
| 227 | ALIGN JUMP_ALIGN |
---|
| 228 | Keyboard_PrintInputtedCharacter: |
---|
| 229 | push di |
---|
| 230 | CALL_DISPLAY_LIBRARY PrintCharacterFromAL |
---|
[48] | 231 | CALL_DISPLAY_LIBRARY SynchronizeDisplayContextToHardware ; Hardware cursor |
---|
[41] | 232 | pop di |
---|
| 233 | ret |
---|
| 234 | |
---|
| 235 | |
---|
| 236 | ;-------------------------------------------------------------------- |
---|
| 237 | ; Keyboard_RemoveAllKeystrokesFromBuffer |
---|
| 238 | ; Parameters: |
---|
| 239 | ; Nothing |
---|
| 240 | ; Returns: |
---|
| 241 | ; Nothing |
---|
| 242 | ; Corrupts registers: |
---|
| 243 | ; AX |
---|
| 244 | ;-------------------------------------------------------------------- |
---|
| 245 | ALIGN JUMP_ALIGN |
---|
| 246 | Keyboard_RemoveAllKeystrokesFromBuffer: |
---|
| 247 | call Keyboard_GetKeystrokeToAX |
---|
| 248 | jnz SHORT Keyboard_RemoveAllKeystrokesFromBuffer |
---|
| 249 | ret |
---|
| 250 | |
---|
| 251 | |
---|
| 252 | ;-------------------------------------------------------------------- |
---|
| 253 | ; Keyboard_GetKeystrokeToAX |
---|
| 254 | ; Keyboard_GetKeystrokeToAXandLeaveItToBuffer |
---|
| 255 | ; Keyboard_GetKeystrokeToAXandWaitIfNecessary |
---|
| 256 | ; Parameters: |
---|
| 257 | ; Nothing |
---|
| 258 | ; Returns: |
---|
| 259 | ; AL: ASCII character (if keystroke available) |
---|
| 260 | ; AH: BIOS scan code (if keystroke available) |
---|
| 261 | ; ZF: Set if no keystroke available |
---|
| 262 | ; Cleared if keystroke available |
---|
| 263 | ; Corrupts registers: |
---|
| 264 | ; Nothing |
---|
| 265 | ;-------------------------------------------------------------------- |
---|
| 266 | ALIGN JUMP_ALIGN |
---|
| 267 | Keyboard_GetKeystrokeToAX: |
---|
| 268 | call Keyboard_GetKeystrokeToAXandLeaveItToBuffer |
---|
| 269 | jnz SHORT Keyboard_GetKeystrokeToAXandWaitIfNecessary |
---|
| 270 | ret |
---|
| 271 | ALIGN JUMP_ALIGN |
---|
| 272 | Keyboard_GetKeystrokeToAXandLeaveItToBuffer: |
---|
| 273 | mov ah, CHECK_FOR_KEYSTROKE |
---|
| 274 | int BIOS_KEYBOARD_INTERRUPT_16h |
---|
| 275 | ret |
---|
| 276 | ALIGN JUMP_ALIGN |
---|
| 277 | Keyboard_GetKeystrokeToAXandWaitIfNecessary: |
---|
| 278 | xor ah, ah ; GET_KEYSTROKE |
---|
| 279 | int BIOS_KEYBOARD_INTERRUPT_16h |
---|
| 280 | test ax, ax ; Clear ZF |
---|
| 281 | ret |
---|