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annotate src/timer/nds/SDL_systimer.c @ 3976:8582c6a5ca16 SDL-1.2

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Added initial support for Nintendo DS, based on the work by Troy Davis (GPF)
author Sam Lantinga <slouken@libsdl.org>
date Mon, 25 Jun 2007 00:50:20 +0000
parents
children a1b03ba2fcd0
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3976
8582c6a5ca16 Added initial support for Nintendo DS, based on the work by Troy Davis (GPF)
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 #include "SDL_thread.h"
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25 #include "SDL_timer.h"
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26 #include "SDL_error.h"
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27 #include "../SDL_timer_c.h"
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28
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29 #include <nds.h>
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30
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31 #define timers2ms(tlow,thigh)(tlow | (thigh<<16)) >> 5
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32
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33
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34 void SDL_StartTicks(void)
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35 {
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36 TIMER0_DATA=0;
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37 TIMER1_DATA=0;
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38 TIMER0_CR=TIMER_ENABLE|TIMER_DIV_1024;
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39 TIMER1_CR=TIMER_ENABLE|TIMER_CASCADE;
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40 }
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41
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42 Uint32 SDL_GetTicks(void)
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43 {
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44 return timers2ms(TIMER0_DATA, TIMER1_DATA);
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45 }
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46
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47 void SDL_Delay(Uint32 ms)
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48 {
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49 Uint32 now;
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50 now=timers2ms(TIMER0_DATA, TIMER1_DATA);
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51 while((Uint32)timers2ms(TIMER0_DATA, TIMER1_DATA)<now+ms);
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52
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53 }
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54
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55 /* This is only called if the event thread is not running */
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56 int SDL_SYS_TimerInit(void)
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57 {
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58 return 0;
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59 }
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60
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61 void SDL_SYS_TimerQuit(void)
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62 {
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63 }
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64
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65 int SDL_SYS_StartTimer(void)
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66 {
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67 SDL_SetError("Timers not implemented on NDS");
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68 return -1;
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69 }
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70
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71 void SDL_SYS_StopTimer(void)
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72 {
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73 }