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comparison src/timer/nds/SDL_systimer.c @ 2735:204be4fc2726

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Final merge of Google Summer of Code 2008 work... Port SDL 1.3 to the Nintendo DS by Darren Alton, mentored by Sam Lantinga
author Sam Lantinga <slouken@libsdl.org>
date Wed, 27 Aug 2008 15:10:03 +0000
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children 99210400e8b9
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2734:dd25eabe441c 2735:204be4fc2726
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 #ifdef SDL_TIMER_NDS
25
26 #include <nds.h>
27 #include <nds/timers.h>
28
29 #include "SDL_timer.h"
30 #include "../SDL_timer_c.h"
31 #include "../SDL_systimer.h"
32
33 /* Data to handle a single periodic alarm */
34 static int timer_alive = 0;
35 static Uint32 timer_ticks;
36
37 void
38 SDL_StartTicks(void)
39 {
40 if (!timer_alive) {
41 SDL_SYS_TimerInit();
42 SDL_SYS_StartTimer();
43 }
44
45 timer_ticks = 0;
46 }
47
48 Uint32
49 SDL_GetTicks(void)
50 {
51 return timer_ticks;
52 }
53
54 void
55 SDL_Delay(Uint32 ms)
56 {
57 Uint32 start = SDL_GetTicks();
58 while (timer_alive) {
59 if ((SDL_GetTicks() - start) >= ms)
60 break;
61 }
62 }
63
64 static int
65 RunTimer(void *unused)
66 {
67 while (timer_alive) {
68 if (SDL_timer_running) {
69 }
70 SDL_Delay(1);
71 }
72 return (0);
73 }
74
75 void
76 NDS_TimerInterrupt(void)
77 {
78 timer_ticks++;
79 }
80
81 /* This is only called if the event thread is not running */
82 int
83 SDL_SYS_TimerInit(void)
84 {
85 timer_alive = 1;
86 timer_ticks = 0;
87 TIMER_CR(3) = TIMER_DIV_1024 | TIMER_IRQ_REQ;
88 TIMER_DATA(3) = TIMER_FREQ_1024(1000);
89 irqSet(IRQ_TIMER3, NDS_TimerInterrupt);
90 irqEnable(IRQ_TIMER3);
91 return 0;
92 }
93
94 void
95 SDL_SYS_TimerQuit(void)
96 {
97 if (timer_alive) {
98 TIMER_CR(3) = 0;
99 }
100 timer_alive = 0;
101 irqDisable(IRQ_TIMER3);
102 }
103
104 int
105 SDL_SYS_StartTimer(void)
106 {
107 TIMER_CR(3) |= TIMER_ENABLE;
108 return 0;
109 }
110
111 void
112 SDL_SYS_StopTimer(void)
113 {
114 TIMER_CR(3) &= ~TIMER_ENABLE;
115 return;
116 }
117
118
119 #endif /* SDL_TIMER_NDS */
120 /* vi: set ts=4 sw=4 expandtab: */