main.c

S3C44B0X 定时器中断

#include "option.h"
#include "def.h"
#include "44b.h"
#include "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 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)
{
    rSYSCFG=CACHECFG;   // Using 8KB Cache//

    Port_Init();
    Uart_Init(0,57600);
    Delay(10);
    Uart_Select(0); //Select UART0
    Led_Display(0x07);
    
    Uart_Printf("\nSXHC44B0 TIMER INTERRUPT ");
    Uart_Printf("\n定时器中断DEMO");
    
    Timer_Init();
    while(1);
}