Changeset 60 in xtideuniversalbios for trunk/Assembly_Library/Src/Time/TimerTicks.asm

Timestamp:

Nov 25, 2010, 2:17:45 PM (13 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to Assembly Library:

• Timeout count down is now stopped when any key pressed.

File:

• trunk/Assembly_Library/Src/Time/TimerTicks.asm (modified) (3 diffs)

trunk/Assembly_Library/Src/Time/TimerTicks.asm

@@ -2 +2 @@
 ; Project name  :   Assembly Library
 ; Created date  :   24.7.2010
-; Last update   :   3.8.2010
+; Last update   :   22.11.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for system timer related operations.
@@ -72 +72 @@
     ret
 
+
 ;--------------------------------------------------------------------
-; Timeout counter can be initialized with TimerTicks_InitializeTimeoutFromAX.
-;
-; TimerTicks_SetCarryIfTimeoutFromDSBX
+; TimerTicks_GetTimeoutTicksLeftToAXfromDSBX
 ;   Parameters:
+;       AX:         Number of ticks left before timeout
 ;       DS:BX:      Ptr to timeout variable WORD
 ;   Returns:
@@ -85 +85 @@
 ;--------------------------------------------------------------------
 ALIGN JUMP_ALIGN
-TimerTicks_SetCarryIfTimeoutFromDSBX:
-    push    ax
+TimerTicks_GetTimeoutTicksLeftToAXfromDSBX:
+    push    dx
+    mov     dx, [bx]
     call    TimerTicks_ReadFromBdaToAX
-    cmp     [bx], ax        ; Set CF if timeout WORD is less than time
-    pop     ax
+    xchg    ax, dx
+    sub     ax, dx      ; AX = End time - current time
+    pop     dx
     ret