src/timer/nds/SDL_systimer.c
author Sam Lantinga
Sat, 06 Oct 2012 12:16:32 -0700
changeset 6566 dd7e57847ea9
parent 6138 4c64952a58fb
child 6885 700f1b25f77f
permissions -rw-r--r--
Add flags to the vidmode debug output
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "SDL_config.h"
    22 
    23 #ifdef SDL_TIMER_NDS
    24 
    25 #include <nds.h>
    26 #include <nds/timers.h>
    27 
    28 #include "SDL_timer.h"
    29 
    30 /* Will wrap after 49 days. Shouldn't be an issue. */
    31 static volatile Uint32 timer_ticks;
    32 
    33 static void
    34 NDS_TimerInterrupt(void)
    35 {
    36     timer_ticks++;
    37 }
    38 
    39 void
    40 SDL_StartTicks(void)
    41 {
    42     timer_ticks = 0;
    43 
    44 	/* Set timer 2 to fire every ms. */
    45 	timerStart(2, ClockDivider_1024, TIMER_FREQ_1024(1000), NDS_TimerInterrupt);
    46 }
    47 
    48 Uint32
    49 SDL_GetTicks(void)
    50 {
    51     return timer_ticks;
    52 }
    53 
    54 Uint64
    55 SDL_GetPerformanceCounter(void)
    56 {
    57     return SDL_GetTicks();
    58 }
    59 
    60 Uint64
    61 SDL_GetPerformanceFrequency(void)
    62 {
    63     return 1000;
    64 }
    65 
    66 void
    67 SDL_Delay(Uint32 ms)
    68 {
    69     Uint32 start = SDL_GetTicks();
    70     while (1) {
    71         if ((SDL_GetTicks() - start) >= ms)
    72             break;
    73     }
    74 }
    75 
    76 #endif /* SDL_TIMER_NDS */
    77 
    78 /* vi: set ts=4 sw=4 expandtab: */