1 /*

     2     SDL - Simple DirectMedia Layer

     3     Copyright (C) 1997-2006 Sam Lantinga

     4 

     5     This library is free software; you can redistribute it and/or

     6     modify it under the terms of the GNU Lesser General Public

     7     License as published by the Free Software Foundation; either

     8     version 2.1 of the License, or (at your option) any later version.

     9 

    10     This library is distributed in the hope that it will be useful,

    11     but WITHOUT ANY WARRANTY; without even the implied warranty of

    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13     Lesser General Public License for more details.

    14 

    15     You should have received a copy of the GNU Lesser General Public

    16     License along with this library; if not, write to the Free Software

    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    18 

    19     Sam Lantinga

    20     slouken@libsdl.org

    21 */

    22 #include "SDL_config.h"

    23 

    24 #include "SDL_thread.h"

    25 #include "SDL_timer.h"

    26 #include "SDL_error.h"

    27 #include "../SDL_timer_c.h"

    28 

    29 #include <nds.h>

    30 

    31 #define timers2ms(tlow,thigh)(tlow | (thigh<<16)) >> 5

    32 

    33 

    34 void SDL_StartTicks(void)

    35 {

    36    TIMER0_DATA=0; 

    37    TIMER1_DATA=0; 

    38    TIMER0_CR=TIMER_ENABLE|TIMER_DIV_1024; 

    39    TIMER1_CR=TIMER_ENABLE|TIMER_CASCADE;

    40 }

    41 

    42 Uint32 SDL_GetTicks(void)

    43 {

    44 	return timers2ms(TIMER0_DATA, TIMER1_DATA);

    45 }

    46 

    47 void SDL_Delay(Uint32 ms)

    48 {

    49    Uint32 now; 

    50    now=timers2ms(TIMER0_DATA, TIMER1_DATA); 

    51    while((Uint32)timers2ms(TIMER0_DATA, TIMER1_DATA)<now+ms); 

    52 

    53 }

    54 

    55 /* This is only called if the event thread is not running */

    56 int SDL_SYS_TimerInit(void)

    57 {

    58 	return 0;

    59 }

    60 

    61 void SDL_SYS_TimerQuit(void)

    62 {

    63 }

    64 

    65 int SDL_SYS_StartTimer(void)

    66 {

    67 	SDL_SetError("Timers not implemented on NDS");

    68 	return -1;

    69 }

    70 

    71 void SDL_SYS_StopTimer(void)

    72 {

    73 }