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annotate src/timer/nds/SDL_systimer.c @ 2697:c9121b04cffa gsoc2008_nds

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Some more work on the audio driver.
author Darren Alton <dalton@stevens.edu>
date Thu, 21 Aug 2008 12:38:21 +0000
parents 0b395a60deff
children e1da92da346c
rev   line source
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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 #include "../SDL_systimer.h"
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32
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33 /* Data to handle a single periodic alarm */
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34 static int timer_alive = 0;
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35 static Uint32 timer_ticks;
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36
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37 void
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38 SDL_StartTicks(void)
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39 {
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40 if(!timer_alive) {
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41 SDL_SYS_TimerInit();
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42 SDL_SYS_StartTimer();
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43 }
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44
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45 timer_ticks = 0;
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46 }
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47
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48 Uint32
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49 SDL_GetTicks(void)
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50 {
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51 return timer_ticks;
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52 }
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53
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54 void
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55 SDL_Delay(Uint32 ms)
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56 {
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57 Uint32 start = SDL_GetTicks();
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58 while(timer_alive) {
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59 if((SDL_GetTicks() - start) >= ms) break;
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60 }
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61 }
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62
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63 static int
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64 RunTimer(void *unused)
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65 {
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66 while (timer_alive) {
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67 if (SDL_timer_running) {
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68 }
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69 SDL_Delay(1);
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70 }
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71 return (0);
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72 }
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73
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74 void NDS_TimerInterrupt(void) {
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75 timer_ticks++;
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76 }
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77
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78 /* This is only called if the event thread is not running */
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79 int
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80 SDL_SYS_TimerInit(void)
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81 {
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82 timer_alive = 1;
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83 timer_ticks = 0;
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84 TIMER_CR(3) = TIMER_DIV_1024 | TIMER_IRQ_REQ;
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85 TIMER_DATA(3) = TIMER_FREQ_1024(1000);
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86 irqSet(IRQ_TIMER3, NDS_TimerInterrupt);
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87 irqEnable(IRQ_TIMER3);
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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(3) = 0;
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96 }
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97 timer_alive = 0;
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98 irqDisable(IRQ_TIMER3);
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99 }
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100
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101 int
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102 SDL_SYS_StartTimer(void)
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103 {
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104 TIMER_CR(3) |= TIMER_ENABLE;
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105 return 0;
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106 }
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107
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108 void
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109 SDL_SYS_StopTimer(void)
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110 {
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111 TIMER_CR(3) &= ~TIMER_ENABLE;
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112 return;
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113 }
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114
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115
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116 #endif /* SDL_TIMER_NDS */
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117 /* vi: set ts=4 sw=4 expandtab: */