#include "s3c2410.h"/* SDRAM 13個(gè)寄存器的值 */ unsigned long  const	mem_cfg_val[]={	0x22111110,		//BWSCON					0x00000700,		//BANKCON0					0x00000700,		//BANKCON1					0x00000700,		//BANKCON2					0x00000700,		//BANKCON3						0x00000700,		//BANKCON4					0x00000700,		//BANKCON5					0x00018005,		//BANKCON6					0x00018005,		//BANKCON7					0x008e07a3,		//REFRESH					0x000000b2,		//BANKSIZE					0x00000030,		//MRSRB6					0x00000030,		//MRSRB7					 }; void disable_watch_dog();void memsetup();void reset_nand();void init_nand();inline void wait_idle(void);void nand_read_ll(unsigned char *buf, unsigned long start_addr, int size);void init_uart();void Timer0_init();/*上電后，WATCH DOG默認(rèn)是開著的，要把它關(guān)掉 */void disable_watch_dog(){	WTCON	= 0;}/* 設(shè)置控制SDRAM的13個(gè)寄存器 */void memsetup(){	int 	i = 0;	unsigned long *p = (unsigned long *)MEM_CTL_BASE;	for(; i < 13; i++)		p[i] = mem_cfg_val[i];}/* 在第一次實(shí)用NAND Flash前，復(fù)位一下NAND Flash */void reset_nand(){	int i=0;	NFCONF &= ~0x800;    	for(; i<10; i++);	NFCMD = 0xff;	//reset command	wait_idle();}/* 初始化NAND Flash */void init_nand(){	NFCONF = 0xf830;	reset_nand();}/**************************************************************************	以下讀NAND Flash的代碼來自mizi公司的bootloader vivi*************************************************************************/#define BUSY 1inline void wait_idle(void) {    int i;    while(!(NFSTAT & BUSY))      for(i=0; i<10; i++);}#define NAND_SECTOR_SIZE	512#define NAND_BLOCK_MASK		(NAND_SECTOR_SIZE - 1)/* low level nand read function */void nand_read_ll(unsigned char *buf, unsigned long start_addr, int size){    int i, j;    if ((start_addr & NAND_BLOCK_MASK) || (size & NAND_BLOCK_MASK)) {        return ;	/* invalid alignment */    }    /* chip Enable */    NFCONF &= ~0x800;    for(i=0; i<10; i++);    for(i=start_addr; i < (start_addr + size);) {      /* READ0 */      NFCMD = 0;      /* Write Address */      NFADDR = i & 0xff;      NFADDR = (i >> 9) & 0xff;      NFADDR = (i >> 17) & 0xff;      NFADDR = (i >> 25) & 0xff;      wait_idle();      for(j=0; j < NAND_SECTOR_SIZE; j++, i++) {	*buf = (NFDATA & 0xff);	buf++;      }    }    /* chip Disable */    NFCONF |= 0x800;	/* chip disable */    return ;}#define EINT1		(2<<(1*2))#define EINT2		(2<<(2*2))#define EINT3		(2<<(3*2))#define EINT7		(2<<(7*2))void init_irq( ){	INTMSK &= (~(1<<10));	//INT_TIMER0使能}/************************************************************************** Timer input clock Frequency = PCLK / {prescaler value+1} / {divider value}* {prescaler value} = 0~255* {divider value} = 2, 4, 8, 16* 本實(shí)驗(yàn)的Timer0的時(shí)鐘頻率=12MHz/(119+1)/(16)=6250Hz* 設(shè)置Timer0 0.5秒鐘觸發(fā)一次中斷：*************************************************************************/void Timer0_init(){	TCFG0 = 119;	//Prescaler0 = 119	  	 	TCFG1 = 0x03;	//Select MUX input for PWM Timer0:divider=16	TCNTB0 = 3125;	//0.5秒鐘觸發(fā)一次中斷	TCON |=  (1<<1);	//Timer 0 manual update	TCON = 0x09;	/*Timer 0 auto reload on			  Timer 0 output inverter off			  清"Timer 0 manual update"			  Timer 0 start */}