timer.c

uc/fs文件系统

/******************************************************************************************/
/*                                                                      						*/
/* FILE NAME    	:timer.c	                   	                									*/
/*																														*/
/* DESCRIPTION		:Timer initialization and handler                       						*/
/*                                                                      						*/
/* AUTHOR 			:Leon		                                        								*/
/*																														*/
/* NOTE				:Must undefine USE_PROFILER for no ptick											*/
/*                                                                      						*/
/* FUNCTIONS 		:clock_init()                                           						*/
/*               	 timer1_handle ()                                       						*/
/*               	 clock_c()                    														*/
/******************************************************************************************/

#include "conreg.h"
#include "timer.h"
#include "uart.h"
//#include "..\cobsp\sams_arm\includes.h"


/******************************************************************************************/
/*called by ipstart																								*/
/*use timer1 to clock ctick																					*/
/******************************************************************************************/

extern void Interrupt_Init(void);
#if AT91_MCK==24000000
#if 0
unsigned long count0;
unsigned long count1;
#else
unsigned long cticks;
#endif

void clock_init(void)
{								
   TC0_CCR=0x02;				/*Disable the Clock Counter*/
		
   TC0_CMR=0x00004004;			/*Choose MCK/1024,RC compare trigger enable*/
   TC0_IDR=0xEF;				/*RC compare interruput Enable*/  
   TC0_IER=0x10;				/*Validate the RC compare interruput*/
		
   TC0_RC=AT91_MCK/1024/TPS; 	/*Time counter ms:  ->AT91_MCK/1024/TPS*/
   
   TC0_CCR= 0x01;				/*Enabled the Clock Counter */
//   TC0_CCR= 0x05;				/*Software trigger command*/	
   TC0_CCR= 0x04;				/*Software trigger command*/		
  #if 0	
   TC0_CCR= 0x01;				/*TC0 Enabled*/
   TC1_CCR=0x02;				/*Disable the Clock Counter*/
		
   TC1_CMR=0x00004004;			/*Choose MCK/1024,RC compare trigger enable*/
   TC1_IDR=0xEF;				/*RC compare interruput Enable*/  
   TC1_IER=0x10;				/*Validate the RC compare interruput*/
		
   TC1_RC=AT91_MCK/1024/TPS; 	/*Time counter :ms  ->AT91_MCK/1024/TPS*/
   	
   count0=0x0;
   count1=0x0;
   #else
   cticks=0x0;
   #endif
}

#else

unsigned long cticks;
void 
clock_init(void)
{						//int init already in uart_init
   TC0_CCR=0x02;/*TC0 Disable*/
        
   TC0_CMR=0x4004;/*MCKI/1024     32768000/1024=32000Hz*/
   TC0_IDR=0xEF;/*RC compare interruput Enable*/
   TC0_IER=0x10;   
        
   TC0_RC=32000/TPS;/*Time counter*/
        //   32000/TPS
                
   TC0_CCR= 0x01;/*TC0 Enabled*/
   TC0_CCR= 0x04;/*TC_CCR ,TC2 start*/	
	
   cticks=0x0;
}
#endif


/******************************************************************************************/
/*Timer1 interrupt handle routine																			*/
/******************************************************************************************/
void 
timer0_handler()
{
  volatile int *TC0_SReg = (int *)TC0_SR;
  volatile int temp;
 
  /* modified by Stephen Yee*/
  temp= AIC_ICCR;
  temp |= 0x10; /* clear TC0 interrupt*/ 
  AIC_ICCR = temp;

//  AIC_ICCR=0xffffffff;
  temp=AIC_IPR;
  temp=(int)TC0_SReg;

  cticks++;
  OSTimeTick();					
}

/******************************************************************************************/
/*Just for linking void function																				*/						
/******************************************************************************************/
void 
clock_c(void)
{
}