src/timer/nds/SDL_systimer.c
author Darren Alton <dalton@stevens.edu>
Fri, 08 Aug 2008 08:22:08 +0000
branchgsoc2008_nds
changeset 2683 e858ac8868b6
child 2696 0b395a60deff
permissions -rw-r--r--
Ongoing video render work; initial work on NDS Timers.
     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 
    32 static Uint32 timer_ticks;
    33 
    34 void
    35 SDL_StartTicks(void)
    36 {
    37     if(!timer_alive) {
    38         SDL_SYS_TimerInit();
    39         SDL_SYS_StartTimer();
    40     }
    41 
    42     timer_ticks = 0;
    43 }
    44 
    45 Uint32
    46 SDL_GetTicks(void)
    47 {
    48     return timer_ticks;
    49 }
    50 
    51 void
    52 SDL_Delay(Uint32 ms)
    53 {
    54     Uint32 start = SDL_GetTicks();
    55     while(timer_alive) {
    56         if((SDL_GetTicks() - start) >= ms) break;
    57     }
    58 }
    59 
    60 /* Data to handle a single periodic alarm */
    61 static int timer_alive = 0;
    62 static int timer_ticks = 0;
    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 NDS_TimerInterrupt() {
    76     printf("timer irq\n");
    77 }
    78 
    79 /* This is only called if the event thread is not running */
    80 int
    81 SDL_SYS_TimerInit(void)
    82 {
    83     timer_alive = 1;
    84     timer_ticks = 0;
    85     TIMER_CR(0) = TIMER_DIV_1024 | TIMER_IRQ_REQ;
    86     TIMER_DATA(0) = TIMER_FREQ_1024(1000);
    87     irqSet(IRQ_TIMER1, NDS_TimerInterrupt);
    88     return 0;
    89 }
    90 
    91 void
    92 SDL_SYS_TimerQuit(void)
    93 {
    94     if (timer_alive) {
    95         TIMER_CR(0) = 0;
    96     }
    97     timer_alive = 0;
    98 }
    99 
   100 int
   101 SDL_SYS_StartTimer(void)
   102 {
   103     TIMER_CR(0) |= TIMER_ENABLE;
   104     return 0;
   105 }
   106 
   107 void
   108 SDL_SYS_StopTimer(void)
   109 {
   110     TIMER_CR(0) &= ~TIMER_ENABLE;
   111     return;
   112 }
   113 
   114 
   115 #endif /* SDL_TIMER_NDS */
   116 /* vi: set ts=4 sw=4 expandtab: */