timers.h

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/*---------------------------------------------------------------------------------

        Copyright (C) 2005
                Michael Noland (joat)
                Jason Rogers (dovoto)
                Dave Murphy (WinterMute)

        This software is provided 'as-is', without any express or implied
        warranty.  In no event will the authors be held liable for any
        damages arising from the use of this software.

        Permission is granted to anyone to use this software for any
        purpose, including commercial applications, and to alter it and
        redistribute it freely, subject to the following restrictions:

        1.      The origin of this software must not be misrepresented; you
                must not claim that you wrote the original software. If you use
                this software in a product, an acknowledgment in the product
                documentation would be appreciated but is not required.
        2.      Altered source versions must be plainly marked as such, and
                must not be misrepresented as being the original software.
        3.      This notice may not be removed or altered from any source
                distribution.

---------------------------------------------------------------------------------*/


//---------------------------------------------------------------------------------
#ifndef NDS_TIMERS_INCLUDE
#define NDS_TIMERS_INCLUDE
//---------------------------------------------------------------------------------


//---------------------------------------------------------------------------------
#ifdef __cplusplus
extern "C" {
#endif
//---------------------------------------------------------------------------------


#include <nds/ndstypes.h>
#include <nds/linkedlist.h>

typedef enum {
ClockDivider_1 = 0, 
ClockDivider_64 = 1,   
ClockDivider_256 = 2,   
ClockDivider_1024 = 3    
}ClockDivider;
 



void timerStart(int channel, ClockDivider divider, u16 ticks, fp callback); 


u16 timerElapsed(int channel);


static inline u16 timerFreqToTicks_1(int freq) {return -0x2000000 / freq;}
static inline u16 timerFreqToTicks_64(int freq) {return (-0x2000000 >> 6) / freq;}
static inline u16 timerFreqToTicks_256(int freq) {return (-0x2000000 >> 8) / freq;}
static inline u16 timerFreqToTicks_1024(int freq) {return (-0x2000000 >> 10) / freq;}

// Timers


#define TIMER_FREQ(n)    (-0x2000000/(n))
        

#define TIMER_FREQ_64(n)  (-(0x2000000>>6)/(n))
        

#define TIMER_FREQ_256(n) (-(0x2000000>>8)/(n))
        

#define TIMER_FREQ_1024(n) (-(0x2000000>>10)/(n))


#define TIMER0_DATA    (*(vuint16*)0x04000100)

#define TIMER1_DATA    (*(vuint16*)0x04000104)

#define TIMER2_DATA    (*(vuint16*)0x04000108)

#define TIMER3_DATA    (*(vuint16*)0x0400010C)


#define TIMER_DATA(n)  (*(vuint16*)(0x04000100+((n)<<2)))

// Timer control registers
#define TIMER0_CR   (*(vuint16*)0x04000102)

#define TIMER1_CR   (*(vuint16*)0x04000106)

#define TIMER2_CR   (*(vuint16*)0x0400010A)

#define TIMER3_CR   (*(vuint16*)0x0400010E)


#define TIMER_CR(n) (*(vuint16*)(0x04000102+((n)<<2)))

#define TIMER_ENABLE    (1<<7)

#define TIMER_IRQ_REQ   (1<<6)

#define TIMER_CASCADE   (1<<2)

#define TIMER_DIV_1     (0)

#define TIMER_DIV_64    (1)

#define TIMER_DIV_256   (2)

#define TIMER_DIV_1024  (3)

static inline void timerStop(int channel){TIMER_CR(channel) &= ~TIMER_ENABLE;}

void cpuStartTiming(u32 timer);

u32 cpuEndTiming();

//---------------------------------------------------------------------------------
#ifdef __cplusplus
}
#endif
//---------------------------------------------------------------------------------

//---------------------------------------------------------------------------------
#endif
//---------------------------------------------------------------------------------

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