ARM定时器

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time.h

#ifndef _S3C2451_TIMER_H#define _S3C2451_TIMER_H#include "typedef.h"typedef struct{                U32 TCFG0;              U32 TCFG1;              U32 TCON;                 U32 TCNTB0;U32 TCMPB0;U32 TCNTO0;U32 TCNTB1;U32 TCMPB1;U32 TCNTO1;U32 TCNTB2;U32 TCMPB2;U32 TCNTO2;U32 TCNTB3;U32 TCMPB3;U32 TCNTO3;U32 TCNTB4;U32 TCNTO4;                     }volatile *TIM_MemMapPtr;#define TIM_BASE_PTR        ((TIM_MemMapPtr)0x51000000)typedef enum{            time_ch0=0,            time_ch1,            time_ch2,            time_ch3,            time_ch4               }TIM_typedef;typedef struct{                unsigned int TIM_Scale;                unsigned int TIM_Prescale;              unsigned int TIM_Countval;              unsigned int TIM_Compareval;                      }TIM_basetypedef;extern void TIM_init(TIM_typedef timx,TIM_basetypedef tim_basetypedef);extern void TIM_Interrupt_init(TIM_typedef timx,U32 addr);extern U16 TIM_getcount(TIM_typedef timx);#endif

timer.c

#include "s3c2451_timer.h"#include "s3c2451_vector.h" void TIM_init(TIM_typedef timx,TIM_basetypedef tim_basetypedef) {  TIM_BASE_PTR->TCFG0 &=~0xff; TIM_BASE_PTR->TCFG0 |=199;  TIM_BASE_PTR->TCFG1 &=~0X0F; TIM_BASE_PTR->TCFG1 |=0X2;  TIM_BASE_PTR->TCNTB0=41250; TIM_BASE_PTR->TCMPB0=20625; TIM_BASE_PTR->TCON  |=(1<<3); TIM_BASE_PTR->TCON  |=(1<<1); TIM_BASE_PTR->TCON  |=(1<<0);  TIM_BASE_PTR->TCON  &=~(1<<1); }  U16 TIM_getcount(TIM_typedef timx) {   return TIM_BASE_PTR->TCNTO0;}void TIM_Interrupt_init(TIM_typedef timx,U32 addr){ if(timx==time_ch0){      pISR_TIMER0=addr;  }}

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