timers.h

Contains defines and macros for ARM7 and ARM9 timer operation. It also contains a simplified API for timer use including the ability to chain multiple callbacks to a single hardware timer. [詳細]

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

ソースコードを見る。

マクロ定義
#define	TIMER_FREQ(n)   (-0x2000000/(n))
	A macro that calculates TIMER_DATA(n) settings for a given frequency of n.
#define	TIMER_FREQ_64(n)   (-(0x2000000>>6)/(n))
	A macro that calculates TIMER_DATA(n) settings for a given frequency of n.
#define	TIMER_FREQ_256(n)   (-(0x2000000>>8)/(n))
	A macro that calculates TIMER_DATA(n) settings for a given frequency of n.
#define	TIMER_FREQ_1024(n)   (-(0x2000000>>10)/(n))
	A macro that calculates TIMER_DATA(n) settings for a given frequency of n.
#define	TIMER0_DATA   (*(vuint16*)0x04000100)
	Same as TIMER_DATA(0).
#define	TIMER1_DATA   (*(vuint16*)0x04000104)
	Same as TIMER_DATA(1).
#define	TIMER2_DATA   (*(vuint16*)0x04000108)
	Same as TIMER_DATA(2).
#define	TIMER3_DATA   (*(vuint16*)0x0400010C)
	Same as TIMER_DATA(3).
#define	TIMER_DATA(n)   (*(vuint16*)(0x04000100+((n)<<2)))
	Returns a dereferenced pointer to the data register for timer number "n".
#define	TIMER0_CR   (*(vuint16*)0x04000102)
	Same as TIMER_CR(0).
#define	TIMER1_CR   (*(vuint16*)0x04000106)
	Same as TIMER_CR(1).
#define	TIMER2_CR   (*(vuint16*)0x0400010A)
	Same as TIMER_CR(2).
#define	TIMER3_CR   (*(vuint16*)0x0400010E)
	Same as TIMER_CR(3).
#define	TIMER_CR(n)   (*(vuint16*)(0x04000102+((n)<<2)))
	Returns a dereferenced pointer to the data register for timer control Register.
#define	TIMER_ENABLE   (1<<7)
	Enables the timer.
#define	TIMER_IRQ_REQ   (1<<6)
	Causes the timer to request an Interupt on overflow.
#define	TIMER_CASCADE   (1<<2)
	When set will cause the timer to count when the timer below overflows (unavailable for timer 0).
#define	TIMER_DIV_1   (0)
	Causes the timer to count at 33.514Mhz.
#define	TIMER_DIV_64   (1)
	Causes the timer to count at (33.514 / 64) Mhz.
#define	TIMER_DIV_256   (2)
	Causes the timer to count at (33.514 / 256) Mhz.
#define	TIMER_DIV_1024   (3)
	Causes the timer to count at (33.514 / 1024)Mhz.
列挙型
enum	ClockDivider {   ClockDivider_1 = 0,   ClockDivider_64 = 1,   ClockDivider_256 = 2,   ClockDivider_1024 = 3 }
	allowable timer clock dividers [詳細]
関数
void	timerStart (int channel, ClockDivider divider, u16 ticks, fp callback)
	Creates a standard timer. Callback is tied directly to interupt table and called directly resulting in less latency than the attached timer.
u16	timerElapsed (int channel)
	returns the ticks elapsed since the last call to timerElapsed()
void	cpuStartTiming (u32 timer)
	begins cpu Timing using two timers for 32bit resolution.
u32	cpuEndTiming ()
	ends cpu Timing

---

説明

Contains defines and macros for ARM7 and ARM9 timer operation. It also contains a simplified API for timer use including the ability to chain multiple callbacks to a single hardware timer.

The timers are fed with a 33.513982 MHz source on the ARM9 and ARM7

• Timer API
• Timer Direct Register Access

---

関数

u32 cpuEndTiming

(

)

ends cpu Timing

戻り値:

The number of ticks which have elapsed since cpuStartTiming

void cpuStartTiming

(

u32

timer

)

begins cpu Timing using two timers for 32bit resolution.

引数:

timer

The base hardware channel to use (0 - 2)