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annotate src/timer/nds/SDL_systimer.c @ 2683:e858ac8868b6 gsoc2008_nds

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Ongoing video render work; initial work on NDS Timers.
author Darren Alton <dalton@stevens.edu>
date Fri, 08 Aug 2008 08:22:08 +0000
parents
children 0b395a60deff
rev   line source
2683
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Darren Alton <dalton@stevens.edu>
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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 #ifdef SDL_TIMER_NDS
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25
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26 #include <nds.h>
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27 #include <nds/timers.h>
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28
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29 #include "SDL_timer.h"
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30 #include "../SDL_timer_c.h"
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31
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32 static Uint32 timer_ticks;
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33
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34 void
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35 SDL_StartTicks(void)
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36 {
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37 if(!timer_alive) {
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38 SDL_SYS_TimerInit();
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39 SDL_SYS_StartTimer();
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40 }
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41
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42 timer_ticks = 0;
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43 }
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44
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45 Uint32
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46 SDL_GetTicks(void)
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47 {
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48 return timer_ticks;
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49 }
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50
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51 void
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52 SDL_Delay(Uint32 ms)
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53 {
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54 Uint32 start = SDL_GetTicks();
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55 while(timer_alive) {
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56 if((SDL_GetTicks() - start) >= ms) break;
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57 }
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58 }
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59
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60 /* Data to handle a single periodic alarm */
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61 static int timer_alive = 0;
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62 static int timer_ticks = 0;
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63
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64 static int
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65 RunTimer(void *unused)
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66 {
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67 while (timer_alive) {
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68 if (SDL_timer_running) {
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69 }
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70 SDL_Delay(1);
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71 }
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72 return (0);
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73 }
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74
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75 void NDS_TimerInterrupt() {
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76 printf("timer irq\n");
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77 }
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78
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79 /* This is only called if the event thread is not running */
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80 int
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81 SDL_SYS_TimerInit(void)
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82 {
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83 timer_alive = 1;
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84 timer_ticks = 0;
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85 TIMER_CR(0) = TIMER_DIV_1024 | TIMER_IRQ_REQ;
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86 TIMER_DATA(0) = TIMER_FREQ_1024(1000);
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87 irqSet(IRQ_TIMER1, NDS_TimerInterrupt);
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88 return 0;
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89 }
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90
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91 void
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92 SDL_SYS_TimerQuit(void)
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93 {
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94 if (timer_alive) {
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95 TIMER_CR(0) = 0;
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96 }
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97 timer_alive = 0;
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98 }
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99
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100 int
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101 SDL_SYS_StartTimer(void)
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102 {
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103 TIMER_CR(0) |= TIMER_ENABLE;
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104 return 0;
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105 }
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106
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107 void
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108 SDL_SYS_StopTimer(void)
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109 {
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110 TIMER_CR(0) &= ~TIMER_ENABLE;
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111 return;
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112 }
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113
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114
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115 #endif /* SDL_TIMER_NDS */
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116 /* vi: set ts=4 sw=4 expandtab: */