clock.c

来自「这是基于三星公司的S3C2410芯片中外部中断的应用.」· C语言 代码 · 共 30 行

/* CLOCK & POWER MANAGEMENT */
/*#define rLOCKTIME		(*(volatile unsigned *)0x4C000000)
#define rMPLLCON		(*(volatile unsigned *)0x4C000004)
#define rUPLLCON		(*(volatile unsigned *)0x4C000008)
#define rCLKCON			(*(volatile unsigned *)0x4C00000C)
#define rCLKSLOW		(*(volatile unsigned *)0x4C000010)
#define rCLKDIVN		(*(volatile unsigned *)0x4C000014)*/

#include "s3c2410_addr.h"


void clock_init(void)
{
	 /*init clock*/
    rLOCKTIME = 0xFFFFFF;
    
    /*
    *设置FCLK:HCLK:PCLK=1:2:4,这样假设处理器主频为200M,则HCLK为50M,PCLK为25M
    *ARM920T内核使用FCLK,象内存控制器，LCD控制器等使用HCLK，象看门狗、串口等使用PCLK
    */
    rCLKDIVN  = 0x3;
    
    /* 设置时钟频率为202.7M*/
    rMPLLCON = 0xa1031;
    
    
    
    
}