关于6410的定时器中断，高手，版主进来救命啊！

只看该作者 · 2012-10-5 19:35

跑6410的裸机已经几天了，现在被中断这只拦路虎给截下来了，主要是没有搞懂启动码的问题，现在我贴上我的源程序，希望大家来帮帮忙呐。。。。不甚感激，各位大神们，你们的一句话就能拯救一个中国好青年啊。。这是我的main.c
#define rGPMCON (*(volatile unsigned *)0x7F008820)
#define rGPMDAT (*(volatile unsigned *)0x7f008824)
#define rGPMPUD (*(volatile unsigned *)0x7f008828)

#define rGPFCON (*(volatile unsigned *)(0x7F0080A0))
#define rGPFDAT (*(volatile unsigned *)(0x7F0080A4))
#define rGPFPUD (*(volatile unsigned *)(0x7F0080A8))

#define rGPNCON (*(volatile unsigned *)(0x7F008830))
#define rGPNDAT (*(volatile unsigned *)(0x7F008834))
#define rGPNPUD (*(volatile unsigned *)(0x7F008838))

#define PCLK 66000000  //for S3C6410 66MHZ
#define HCLK 133000000 //for S3C6410 133MHZ
#define rTCFG0 (*(volatile unsigned *)(0x7F006000))
#define rTCFG1 (*(volatile unsigned *)(0x7F006004))
#define rTCON (*(volatile unsigned *)(0x7F006008))
#define rTCNTB0 (*(volatile unsigned *)(0x7F00600C))
#define rTCMPB0 (*(volatile unsigned *)(0x7F006010))
#define rTCNTO0 (*(volatile unsigned *)(0x7F006014))
#define rTCNTB1 (*(volatile unsigned *)(0x7F006018))
#define rTCMPB1 (*(volatile unsigned *)(0x7F00601c))
#define rTCNTO1 (*(volatile unsigned *)(0x7F006020))
#define rTCNTB2 (*(volatile unsigned *)(0x7F006024))
#define rTCNTO2 (*(volatile unsigned *)(0x7F00602c))
#define rTCNTB3 (*(volatile unsigned *)(0x7F006030))
#define rTCNTO3 (*(volatile unsigned *)(0x7F006038))
#define rTCNTB4 (*(volatile unsigned *)(0x7F00603c))
#define rTCNTO4 (*(volatile unsigned *)(0x7F006040))
#define rTINT_CSTAT (*(volatile unsigned *)(0x7F006044))

#define rVIC0INTENABLE (*(volatile unsigned *)(0x71200010))
#define rVIC1INTENABLE (*(volatile unsigned *)(0x71300010))

#define rVIC0VECTADDR  ((volatile unsigned *)(0x71200100))

void IRQ_Exception(void);

void GPIO_Init(void)
{

// 初始化LED的IO配置

rGPMCON = 0x11111;

rGPMPUD = 0x0;

rGPMDAT = 0x1F;

// 初始化蜂鸣器IO配置

rGPFCON = rGPFCON & (~(0x1 << (31)));

rGPFCON = rGPFCON | (0x1 << (2*15));

rGPFPUD = rGPFPUD & (~(0x3 << (2*15))) ;

rGPFDAT = rGPFDAT & 0x7FFF;
}

void timer_init(void)
{

rTINT_CSTAT |= 1<<0; //开timer0中断,允许timer0中断发生

rVIC0INTENABLE |= 1<<23;  //开timer0的使能（相当于关掉mask）

rTCFG0 &= ~0xFF;  // 清除预分频因子位

rTCFG0 |= 0x42; // 设置分频因子(66分频), 定时器时钟频率为1Mhz

rTCFG1 &= ~0x11;  // 设置Divider MUX0为零 1分频

rTCNTB0 = 0x100000; //设初值(1s)

rTCON |= 1<<1;    //开Manual Update (Update TCNTB0,TCMPB0)设置初值后要更新TCNTB

rTCON |= 1<<3;    //Auto Reload on  自动重装开启

rTCON |= 1<<0;       //timer0 open;

rTCON &= ~(1<<1); //不再Update TCNTB0,TCMPB0
}

// 循环延时
void msDelay(int time)
{

volatile unsigned int i, j;

for(i = 0; i < 2000000; i++)

{

for (j = 0; j < time; j++);

}
}

// 打开控件蜂鸣器的三极管
void BeepOff(void)
{

rGPFDAT = rGPFDAT  & 0x7fff;
}
// 关闭控件蜂鸣器的三极管
void BeepOn(void)
{

rGPFDAT = rGPFDAT | 0x8000;
}

int i = 0;
// IRQ异常中断
void IRQ_Exception()
{

i %= 4;

// 打开一个灯，并闭另外一个灯

rGPMDAT = ~(1<<i++);

BeepOn();

msDelay(5);

BeepOff();

// 清除定时器中断状态位

while((rTINT_CSTAT & 0x20)) rTINT_CSTAT |= (1 << 5);
}

void Main()
{

GPIO_Init();

timer_init();

while(1);
}

这是我的init.s

IMPORT main

IMPORT IRQ_Exception

AREA |C$$code|, CODE, READONLY

ENTRY

start

;interrupt vectors

;中断向量表
Reset

LDR    PC, ResetAddr
LDR    PC, UndefinedAddr
LDR    PC, SWI_Addr
LDR    PC, PrefetchAddr
LDR    PC, DataAbortAddr
DCD    0xb9205f80
LDR    PC, IRQAddr
LDR    PC, FIRQAddr

ResetAddr          DCD    ResetInit
UndefinedAddr    DCD    Undefined
SWI_Addr          DCD    SoftwareInterrupt
PrefetchAddr       DCD    PrefetchAbort
DataAbortAddr    DCD    DataAbort
                  DCD    0
IRQAddr          DCD    IRQHandler
FIRQAddr          DCD    FIRQHandler

;未定义指令
Undefined

B    Undefined
;软中断
SoftwareInterrupt
      B    SoftwareInterrupt
;取指令中止
PrefetchAbort
      B    PrefetchAbort
;取数据中止
DataAbort
      B    DataAbort

;
IRQHandler
      STMFD SP!,{r0-r3,r12,lr}          ;保存现场
      ldr lr, =int_return             ;设置中断异常处理程序返回地址到下面的位置
      B  IRQ_Exception                ;直接进入到中断函数处理
int_return
      LDMFD SP!,{r0-r3,r12,lr}          ;恢复现场
      SUBS PC,LR,#4                   ;返回进入中断前的代码

;
FIRQHandler

STMFD sp!,{r0-r12,lr}

B    FIRQHandler

LDMFD sp!, {r0-r12,lr}

SUBS  pc, lr,#4

;禁止中断

DISABLE_IRQ

MRS R0, CPSR

ORR R0, R0, #0x80

MSR CPSR_c, R0

MOV PC, LR

;允许中断
ENABLE_IRQ

MRS R0, CPSR       ;将CPSR保存至R0寄存器中

BIC R0, R0, #0x80 ;R0 = R0 & ~0x80,清除中断位

MSR CPSR_c, R0    ;将R0写回CPSR状态寄存器

MOV PC, LR          ;返回到调用代码
ResetInit

LDR R14, =0x50100000 ;初始化一下栈指针

BL    ENABLE_IRQ  ;打开中断允许位

B    main
   ;跳入MAIN程序

END

现在我的问题是：
谁能告诉我他这个启动码是按照什么流程来写，大概给我一些注释就行（首先是什么，然后是什么，接着是什么，最后是什么）