| [41] | 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for system timer related operations.
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| 3 |
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| 4 | ; System timer ticks 18.2 times per second = 54.9 ms / tick
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| 5 | TICKS_PER_HOUR EQU 65520
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| 6 | TICKS_PER_MINUTE EQU 1092
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| 7 | TICKS_PER_SECOND EQU 18
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| 8 |
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| 9 |
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| 10 | ; Section containing code
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| 11 | SECTION .text
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| 12 |
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| 13 | ;--------------------------------------------------------------------
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| 14 | ; TimerTicks_GetHoursToAXfromTicksInDXAX
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| 15 | ; TimerTicks_GetMinutesToAXfromTicksInDX
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| 16 | ; TimerTicks_GetSecondsToAXfromTicksInDX
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| 17 | ; Parameters
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| 18 | ; DX(:AX): Timer ticks to convert
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| 19 | ; Returns:
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| 20 | ; AX: Hours, minutes or seconds
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| 21 | ; DX: Remainder ticks
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| 22 | ; Corrupts registers:
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| 23 | ; CX
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| 24 | ;--------------------------------------------------------------------
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| [106] | 25 | %ifdef INCLUDE_MENU_DIALOGS
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| 26 |
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| [41] | 27 | ALIGN JUMP_ALIGN
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| 28 | TimerTicks_GetHoursToAXfromTicksInDXAX:
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| 29 | mov cx, TICKS_PER_HOUR
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| 30 | div cx ; Divide DX:AX by CX, Hours to AX, remainder ticks to DX
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| 31 | ret
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| 32 |
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| 33 | ALIGN JUMP_ALIGN
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| 34 | TimerTicks_GetMinutesToAXfromTicksInDX:
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| 35 | xor ax, ax
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| 36 | xchg ax, dx ; Ticks now in DX:AX
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| 37 | mov cx, TICKS_PER_MINUTE
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| 38 | div cx ; Divide DX:AX by CX, Minutes to AX, remainder ticks to DX
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| 39 | ret
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| 40 |
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| [106] | 41 | %endif
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| 42 |
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| [41] | 43 | ALIGN JUMP_ALIGN
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| 44 | TimerTicks_GetSecondsToAXfromTicksInDX:
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| 45 | xchg ax, dx ; Ticks now in AX
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| 46 | mov cl, TICKS_PER_SECOND
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| 47 | div cl ; Divide AX by CL, Seconds to AL, remainder ticks to AH
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| 48 | xor dx, dx
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| 49 | xchg dl, ah ; Seconds in AX, remainder in DX
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| 50 | ret
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| 51 |
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| 52 |
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| 53 | ;--------------------------------------------------------------------
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| 54 | ; First tick might take 0...54.9 ms and remaining ticks
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| 55 | ; will occur at 54.9 ms intervals. Use delay of two (or more) ticks to
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| 56 | ; ensure at least 54.9 ms timeout.
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| 57 | ;
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| 58 | ; TimerTicks_InitializeTimeoutFromAX
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| 59 | ; Parameters:
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| 60 | ; AX: Timeout ticks (54.9 ms) before timeout
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| 61 | ; DS:BX: Ptr to timeout variable WORD
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| 62 | ; Returns:
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| 63 | ; [DS:BX]: Initialized for TimerTicks_SetCarryIfTimeoutFromDSBX
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| 64 | ; Corrupts registers:
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| 65 | ; AX
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| 66 | ;--------------------------------------------------------------------
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| 67 | ALIGN JUMP_ALIGN
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| 68 | TimerTicks_InitializeTimeoutFromAX:
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| 69 | mov [bx], ax ; Store timeout ticks
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| 70 | call TimerTicks_ReadFromBdaToAX
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| [119] | 71 | add [bx], ax ; [bx] now contains end time for timeout
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| [41] | 72 | ret
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| 73 |
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| [60] | 74 |
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| [41] | 75 | ;--------------------------------------------------------------------
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| [60] | 76 | ; TimerTicks_GetTimeoutTicksLeftToAXfromDSBX
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| [41] | 77 | ; Parameters:
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| 78 | ; DS:BX: Ptr to timeout variable WORD
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| 79 | ; Returns:
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| [85] | 80 | ; AX: Number of ticks left before timeout
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| [41] | 81 | ; CF: Set if timeout
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| 82 | ; Cleared if time left
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| 83 | ; Corrupts registers:
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| 84 | ; Nothing
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| 85 | ;--------------------------------------------------------------------
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| 86 | ALIGN JUMP_ALIGN
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| [60] | 87 | TimerTicks_GetTimeoutTicksLeftToAXfromDSBX:
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| 88 | push dx
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| 89 | mov dx, [bx]
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| [41] | 90 | call TimerTicks_ReadFromBdaToAX
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| [60] | 91 | xchg ax, dx
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| 92 | sub ax, dx ; AX = End time - current time
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| 93 | pop dx
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| [41] | 94 | ret
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| 95 |
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| 96 |
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| 97 | ;--------------------------------------------------------------------
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| 98 | ; TimerTicks_GetElapsedToAXandResetDSBX
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| 99 | ; Parameters
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| 100 | ; DS:BX: Ptr to WORD containing previous reset time
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| 101 | ; Returns:
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| 102 | ; AX: 54.9 ms ticks elapsed since last reset
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| 103 | ; [DS:BX]: Reset to latest time
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| 104 | ; Corrupts registers:
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| 105 | ; Nothing
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| 106 | ;--------------------------------------------------------------------
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| 107 | ALIGN JUMP_ALIGN
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| 108 | TimerTicks_GetElapsedToAXandResetDSBX:
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| 109 | call TimerTicks_ReadFromBdaToAX
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| 110 | push ax
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| 111 | sub ax, [bx]
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| 112 | pop WORD [bx] ; Latest time to [DS:BX]
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| 113 | ret
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| 114 |
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| 115 | ;--------------------------------------------------------------------
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| 116 | ; TimerTicks_GetElapsedToAXfromDSBX
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| 117 | ; Parameters
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| 118 | ; DS:BX: Ptr to WORD containing previous update time
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| 119 | ; Returns:
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| 120 | ; AX: 54.9 ms ticks elapsed since initializing [DS:BX]
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| 121 | ; Corrupts registers:
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| 122 | ; Nothing
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| 123 | ;--------------------------------------------------------------------
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| 124 | ALIGN JUMP_ALIGN
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| 125 | TimerTicks_GetElapsedToAXfromDSBX:
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| 126 | call TimerTicks_ReadFromBdaToAX
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| 127 | sub ax, [bx]
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| 128 | ret
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| 129 |
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| 130 |
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| 131 | ;--------------------------------------------------------------------
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| 132 | ; TimerTicks_ReadFromBdaToAX
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| 133 | ; Parameters
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| 134 | ; Nothing
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| 135 | ; Returns:
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| 136 | ; AX: System time in 54.9 ms ticks
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| 137 | ; Corrupts registers:
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| 138 | ; Nothing
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| 139 | ;--------------------------------------------------------------------
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| 140 | ALIGN JUMP_ALIGN
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| 141 | TimerTicks_ReadFromBdaToAX:
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| 142 | push ds
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| 143 |
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| 144 | LOAD_BDA_SEGMENT_TO ds, ax
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| 145 | mov ax, [BDA.dwTimerTicks] ; Read low WORD only
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| 146 |
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| 147 | pop ds
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| 148 | ret
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