pll.c

ADI Blackfin BF51X 範例程式

/*******************************************************************
Analog Devices, Inc. All Rights Reserved.

This software is proprietary and confidential.  By using this software
you agree to the terms of the associated Analog Devices License Agreement.

Project Name:  	Power_On_Self_Test

Hardware:		ADSP-BF518F EZ-Board

Description:	This examples configures the PLL on the EZ-Board.
*******************************************************************/

#include <cdefBF518.h>
#include <ccblkfn.h>
#include <bfrom.h>
#include "pll.h"


/*******************************************************************
*   Function:    Init_PLL
*   Description: initializes the PLL registers
*******************************************************************/
void Init_PLL(void)
{
	u32 SIC_IWR1_reg;                /* backup SIC_IWR1 register */
	
	/* use Blackfin ROM SysControl() to change the PLL */
    ADI_SYSCTRL_VALUES sys_cntrl_struct;

	sys_cntrl_struct.uwPllCtl = 0x2000;		/* (25MHz CLKIN x (MSEL=16))::CCLK = 400MHz */
	sys_cntrl_struct.uwPllDiv = 0x0005;		/* (400MHz/(SSEL=5))::SCLK = 80MHz */

	SIC_IWR1_reg = *pSIC_IWR1;				/* save SIC_IWR1 due to anomaly 05-00-0432 */
	*pSIC_IWR1 = 0;							/* disable wakeups from SIC_IWR1 */
   
	bfrom_SysControl( SYSCTRL_WRITE | SYSCTRL_PLLCTL | SYSCTRL_PLLDIV,
					  &sys_cntrl_struct, NULL);

	*pSIC_IWR1 = SIC_IWR1_reg;				/* restore SIC_IWR1 due to anomaly 05-00-0432 */
}