關於時間中斷的code

#include <string.h>
#include "mmu.h"
#include "2410addr.h"
#include "2410lib.h"
#include "2410slib.h"
#include "def.h"
#include "option.h"
#include "timer.h"


#define LED_OPEN1 ~(1<<5)
#define LED_OPEN2 ~(1<<6)
#define LED_OPEN3 ~(1<<7)


#define LED_CLOSE1 (1<<5)
#define LED_CLOSE2 (1<<6)
#define LED_CLOSE3 (1<<7)


int flag = 1;
static void __irq time_handler(void);
void led_run(void);
void dely(int);
//led init
void led_init(void)
{
    rGPGCON &= ~((3<<10) | (3<<12) | (3<<14));
    rGPGCON |= (1<<10) | (1<<12) | (1<<14);
}


static void cal_cpu_bus_clk(void)
{
    U8 m,p,s;
    U32 val;
    val = (rMPLLCON);
    m = (val>>12) & 0xff;
    p = (val>>4) & 0x3f;
    s = (val) & 3;


    SYS_FCLK = (((FIN / 100) * (8 + m) * 2) / ((p + 2) * (1 << s))) * 100;

  

    val = rCLKDIVN;
    m = (val>>1) & 0x3;
    p = (val) & 0x1;

    val = rCAMDIVN;
    s = val>>8;

    switch(m)
    {
	case 0:
	    SYS_HCLK = SYS_FCLK;
	    break;
	case 1:
	    SYS_HCLK = SYS_FCLK>>1;
	    break;
	case 2:
	    if(s & 2)
		SYS_HCLK = SYS_FCLK >> 3;
	    else
		SYS_HCLK = SYS_FCLK >> 2;
	    break;
	case 3:
	    if(s & 1)
		SYS_HCLK = SYS_FCLK / 6;
	    else
		SYS_HCLK = SYS_FCLK / 3;
	    break;
	default:
	    break;
    }

    if(p)
    {
	SYS_PCLK = SYS_HCLK >> 1;
    }
    else
    {
	SYS_PCLK = SYS_HCLK;
    }
    rUPLLCON = (56<<12) | (2<<4) | 2;
}

//mpll init
void set_clk(void)
{
    ChangeMPllValue(92,1,1);//init rmpllcon    
    SetClockDivider(2,1);//init clkdivn
    cal_cpu_bus_clk();
}

static void __irq time_handler(void)
{
    led_run();
    ClearPending(BIT_TIMER0);
}

void dely(int tt)
{
    int i = 0;
    int j = 0;
    for(;i < tt; i++)
    {
	for(;j < 100000000; j++);
    }
}

void led_run(void)
{
    if(flag)
    {
	rGPGDAT |= LED_CLOSE1 | LED_CLOSE2 | LED_CLOSE3;
	flag = 0;
	
    }
    else
    {
	rGPGDAT &= LED_OPEN1 & LED_OPEN2 & LED_OPEN3;
	flag = 1;
    }
}

void time_init(void)
{
    U32 outf = 0;
    U32 m,p,s;
    rTCFG0 = 49;
    rTCFG1 = 3;

    m = (rTCFG0) & 0xff;
    p = (rTCFG1) & 0xf;

    switch(p)
    {
	case 0:
	    s = 2;
	    break;
	case 1:
	    s = 4;
	    break;
	case 2:
	    s = 8;
	    break; 
	case 3:
	    s = 16;
	    break;
	default:
	    break;
    }
    outf = SYS_PCLK / (m + 1) / s;

    //printf("m is %u,s is %u\n",m,s);
    //printf("outf is %u\n",outf);


    rTCNTB0 = 62500;
    rTCMPB0 = 0;

    printf("rTCNTB0 is %u,rTCMPB0 is %u\n",rTCNTB0,rTCMPB0);

    rTCON |=(1<<1);           //將計數值裝入TCNTB0、TCMPB0
    rTCON = 0x9;

    printf("rTCON is %x\n",rTCON);

    ClearPending(BIT_TIMER0);

    printf("rSRCPND is %x\n",rSRCPND);
    printf("rINTPND is %x\n",rINTPND);

    pISR_TIMER0 = (U32) time_handler;

    EnableIrq(BIT_TIMER0);

    printf("rINTMSK is %x\n",rINTMSK);
}

int Main()
{
    MMU_Init();
    set_clk();
    led_init();
    time_init();
    while(1);
    return 0;
}  

這個程序我調試了將近2天的時間，很多問題，一開始由於硬件的限制調試起來很麻煩，後來就輕鬆了。不過這個程序寫完以後還是覺得其實就是一箇中斷的問題和時鐘的問題，如果你能搞清楚這兩個問題就ok了。。。

現在只能寫這些小程序，老師竟然讓我寫一個視頻存儲程序，讓我有點糾結，儘量把....