[sdl_omap.git] / src / timer / nds / SDL_systimer.c

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_thread.h"
#include "SDL_timer.h"
#include "SDL_error.h"
#include "../SDL_timer_c.h"

#include <nds.h>

#define timers2ms(tlow,thigh)(tlow | (thigh<<16)) >> 5


void SDL_StartTicks(void)
{
   TIMER0_DATA=0; 
   TIMER1_DATA=0; 
   TIMER0_CR=TIMER_ENABLE|TIMER_DIV_1024; 
   TIMER1_CR=TIMER_ENABLE|TIMER_CASCADE;
}

Uint32 SDL_GetTicks(void)
{
	return timers2ms(TIMER0_DATA, TIMER1_DATA);
}

void SDL_Delay(Uint32 ms)
{
   Uint32 now; 
   now=timers2ms(TIMER0_DATA, TIMER1_DATA); 
   while((Uint32)timers2ms(TIMER0_DATA, TIMER1_DATA)<now+ms); 

}

/* This is only called if the event thread is not running */
int SDL_SYS_TimerInit(void)
{
	return 0;
}

void SDL_SYS_TimerQuit(void)
{
}

int SDL_SYS_StartTimer(void)
{
	SDL_SetError("Timers not implemented on NDS");
	return -1;
}

void SDL_SYS_StopTimer(void)
{
}
Commit	Line	Data
e14743d1	1	/*
	2	SDL - Simple DirectMedia Layer
	3	Copyright (C) 1997-2009 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	#include "SDL_thread.h"
	25	#include "SDL_timer.h"
	26	#include "SDL_error.h"
	27	#include "../SDL_timer_c.h"
	28
	29	#include <nds.h>
	30
	31	#define timers2ms(tlow,thigh)(tlow \| (thigh<<16)) >> 5
	32
	33
	34	void SDL_StartTicks(void)
	35	{
	36	TIMER0_DATA=0;
	37	TIMER1_DATA=0;
	38	TIMER0_CR=TIMER_ENABLE\|TIMER_DIV_1024;
	39	TIMER1_CR=TIMER_ENABLE\|TIMER_CASCADE;
	40	}
	41
	42	Uint32 SDL_GetTicks(void)
	43	{
	44	return timers2ms(TIMER0_DATA, TIMER1_DATA);
	45	}
	46
	47	void SDL_Delay(Uint32 ms)
	48	{
	49	Uint32 now;
	50	now=timers2ms(TIMER0_DATA, TIMER1_DATA);
	51	while((Uint32)timers2ms(TIMER0_DATA, TIMER1_DATA)<now+ms);
	52
	53	}
	54
	55	/* This is only called if the event thread is not running */
	56	int SDL_SYS_TimerInit(void)
	57	{
	58	return 0;
	59	}
	60
	61	void SDL_SYS_TimerQuit(void)
	62	{
	63	}
	64
65	int SDL_SYS_StartTimer(void)
66	{
67	SDL_SetError("Timers not implemented on NDS");
68	return -1;
69	}
70
71	void SDL_SYS_StopTimer(void)
72	{
73	}