main.c

44binit.s ----- 初始化中断、存储器、堆栈等

#include "..\inc\option.h"
#include "..\inc\def.h"
#include "..\inc\44b.h"
#include "..\inc\44blib.h"

static U32 TimerCnt=0;
static int LedStatus=0;

void __irq Timer_Tick(void)
{	
    rI_ISPC=BIT_TIMER3;
    
    if(TimerCnt++ == 10) {
		TimerCnt=0;
		Led_Display(LedStatus);
		LedStatus=(~(LedStatus)&0x7);
		Uart_Printf("\nTIMER 3 interrupt... ");
    }
 
}
void Timer_Init(void)
{
/*	
 *	Timer Clock Frequency = MCLK/pre/mux
 */	
    rTCFG0=0x00000f00;	//dead zone=0,pre2=0,pre1=0xf,pre0=0
    rTCFG1=0x00001000;	//all interrupt,mux5=1/2,mux2=1/2,mux3=1/4,mux2=1/2,mux1=1/2,mux0=1/2
    
    rTCNTB3=0xc350;		//(1/(60MHz/4/15))*0xc350=50ms
    					//(1/(60MHz/4/15))*0x4320=20ms
    rTCMPB3=0x0;

    rTCON=0x0020000;	//update T3
    rTCON=0x0090000;	//T3=auto reload,start	
    
    rINTCON=0x5;    //Non-vectored,IRQ enable,FIQ disable 
    rINTMOD=0x0;    //All=IRQ mode
    
    pISR_TIMER3=(unsigned)Timer_Tick;
    rINTMSK=BIT_GLOBAL;
    rINTMSK=~(BIT_GLOBAL|BIT_TIMER3);	//start timer INT
}

void Main(void)
{
	rNCACHBE0 = ((Non_Cache_End>>12)<<16)|(Non_Cache_Start>>12);
    //在上面的数据区域不使用高速缓存

    rSYSCFG = CACHECFG;    //8K字节cache，写缓冲使能，data abort使能

    Port_Init();		//IO口初始化
		
	Uart_Select( 0 ) ;		//选择串口0
	Uart_Init( 32000000, 57600 ) ;		
		//串口初始化，波特率为115200（系统主频为32MHz）
		
   	Uart_Printf( "\n\n\t优龙科技\n" ) ;
   	Uart_Printf( "Http://www.ucdragon.com\n\n" ) ;

   	Uart_Printf( "S3C44B0X定时器3中断测试！\n" ) ;
   	Uart_Printf( "\n请观察开发板上三个发光二极管的变化：\n\n" ) ;
    
    Timer_Init();
    while(1);
}