clock_switching.h

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           : clock_switching.h
//* Object              : Clock Switching Prototyping File.
//* 1.0 17/10/01 S.C    : Creation
//* 1.1 05/mar/03 JPP   : Set the old mode APMC definition
//*----------------------------------------------------------------------------

#ifndef clock_switching_h
#define clock_switching_h

#define MCK_INTERRUPT_LEVEL	7
//*-----------------------------------------------------------------------------
//* ------------------------- General constant definition ----------------------
//*-----------------------------------------------------------------------------

//* Set Presxaler Parameter
#define APMC_PRES_DIV4		2
#define APMC_PRES_DIV8		3
#define APMC_PRES		APMC_PRES_DIV4
#define PRESCALER_VAL		4
#define MASK_PRESCALER		0x70
#define SHIFT_PRESCALER		4

#define EXTARNAL_CLOCK_Mhz	16

#define	TO_LF_OSCILLATOR	0x0	/* The target frequency source is low frequency oscillator */
#define	TO_HF_OSCILLATOR	0x1	/* The target frequency source is the main oscillator */
#define	TO_PLL_OUTPUT		0x2	/* The target frequency source is the PLL output */

#define	CSS_MASK	0xc000		/* All field are masked except CSS */
#define MAX_MUL		0x3f00		/* Maximum for the Multiplier field definition */
#define APMC_CSS_PLL                 0x8000
#define APMC_MOSC_EN                 0x2
#define APMC_CSS_MOSC                0x4000
#define APMC_CSS_LF                  0x0
#define APMC_MOSCS                   0x1
#define APMC_PLL_LOCK                0x2

#define B_MUL                        8

/* Include Standard c Libraries to allow stand alone compiling and operation */
#define TRUE    1
#define FALSE   0
#define AIC_SRCTYPE_EXT_LOW_LEVEL    AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE

//*-----------------------------------------------------------------------------
//* -------------------- General Function Prototyping  -------------------------
//*-----------------------------------------------------------------------------

extern void mck_clock_speed (short source , char frequency_multiplier) ;
extern void set_Prescaler (unsigned int Prescaler);

#endif  /* clock_switching_h */