mips.c

ATMEL AT91RM9200开发板配套光盘上的全部示例程序

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : mips.c
//* Object              : Mips calculation
//* Creation            : JPP   13/Jan/2003
//*
//*----------------------------------------------------------------------------

// Include Standard LIB  files 

#include "eb55.h"
//* -------------------  Internal function prototype  ------------------------- 
void Init_Mips_Timer (void);
void Start_Mips_Timer (void);
unsigned int  Mips_Result_loop(void);
unsigned int  Mips_Result_all(void) ;

//* --------------------------- Constant definition ---------------------------

#define NB_LOSE_CYCLE		 3 	/* 1 for break pipe and 2 for "LDR"*/
#define NB_ASM_INSTRUCTION	(40 + NB_LOSE_CYCLE)

/* Clock Selection */
/*-----------------*/
#define TC_CLKS                  0x7
#define TC_CLKS_MCK2             0x0
#define TC_CLKS_MCK8             0x1
#define TC_CLKS_MCK32            0x2
#define TC_CLKS_MCK128           0x3
#define TC_CLKS_MCK1024          0x4

#define TIMER_INTERRUPT_LEVEL	7

//* --------------------------- Structure definition --------------------------

typedef struct _AT91S_MIPS_TIMER {
unsigned int 	Id ;
unsigned short	Peroid;
unsigned char	Div;
} AT91S_MIPS_TIMER, *AT91PS_MIPS_TIMER;

//* ------------------------------ Global variable ----------------------------

const AT91PS_TC	MipsTimerBase =AT91C_BASE_TC1;
const AT91S_MIPS_TIMER MipsTimer = { AT91C_ID_TC1,((MCK)/1024),TC_CLKS_MCK1024};

volatile unsigned int  cmpt_loop[2];

//* ----------------------- External Function Prototype -----------------------

extern void timer_mpis_irq_handler(void);


//*----------------------------------------------------------------------------
//* Function Name       : Init_Mips_Timer
//* Object              : Init Timer management
//* Input Parameters    : none
//* Output Parameters   : none
//*----------------------------------------------------------------------------
void Init_Mips_Timer (void)
{
    int dummy;
	//* Init timer interrupt
	AT91F_APMC_EnablePeriphClock(AT91C_BASE_APMC,1 << MipsTimer.Id);

	 //* Disable the clock and the interrupts
	MipsTimerBase->TC_CCR = AT91C_TC_CLKDIS ;
	MipsTimerBase->TC_IDR = 0xFFFFFFFF ;
	dummy = MipsTimerBase->TC_SR ;

	//* Set the Mode of the Timer Counter
	MipsTimerBase->TC_CMR = AT91C_TC_WAVE |AT91C_TC_CPCTRG | MipsTimer.Div ;

	//* open Timer 0 interrupt
	AT91F_AIC_ConfigureIt ( AT91C_BASE_AIC, MipsTimer.Id, TIMER_INTERRUPT_LEVEL,AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE, timer_mpis_irq_handler); 

	MipsTimerBase->TC_IER = AT91C_TC_CPCS;  	//* Enable the RC Compare interrupt
	AT91F_AIC_EnableIt (AT91C_BASE_AIC, MipsTimer.Id);

}
//*----------------------------------------------------------------------------
//* Function Name       : Start_Mips_Timer
//* Object              : Start Timer
//* Input Parameters    : none
//* Output Parameters   : none
//*----------------------------------------------------------------------------
void Start_Mips_Timer (void)
{
	cmpt_loop[0]=0;
	//* Enable the clock and Start timer
	MipsTimerBase->TC_CCR = AT91C_TC_CLKEN ;
	MipsTimerBase->TC_RA = 0;
	MipsTimerBase->TC_RB = MipsTimerBase->TC_RC = MipsTimer.Peroid;
	MipsTimerBase->TC_CCR = AT91C_TC_SWTRG ;

}
//*----------------------------------------------------------------------------
//* Function Name       : Mips_Result_loop
//* Object              : Return the number of loop can be executed under the time
//* Input Parameters    : none
//* Output Parameters   : the counter  value
//*----------------------------------------------------------------------------
unsigned int  Mips_Result_loop(void)
{
 return (cmpt_loop[1]);
}
//*----------------------------------------------------------------------------
//* Function Name       : Mips_Result_all
//* Object              : Return the number of loop can be executed under the time
//* Input Parameters    : none
//* Output Parameters   : miliMPIS
//*----------------------------------------------------------------------------
unsigned int  Mips_Result_all(void)
{
 return ((cmpt_loop[1]*NB_ASM_INSTRUCTION) / 1000);

}