#include "def.h" #include "option.h" #include "2440addr.h" #include "2440lib.h" #include "mmu.h" #include "2440slib.h" U32 key; /*static void __irq EINT11_ISR(void) { //清中断必须按一下三个的顺序 rEINTPEND |=( 1<< 11);//外部中断悬挂寄存器，清 0 无请求，1 时有中断请求 rSRCPND |= (1<<5);//指示中断源状态，0 无中断源请求，1 时有中断源请求 rINTPND |=(1<<5);//指示中断状态，0 无中断请求，1 时有中断请求 Uart_Printf("EINT11 is occurred.\n"); } static void __irq EINT8_ISR(void) { //清中断必须按一下三个的顺序 rEINTPEND |=( 1<< 8);//外部中断悬挂寄存器，清 0 无请求，1 时有中断请求 rSRCPND |= (1<<5);//指示中断源状态，0 无中断源请求，1 时有中断源请求 rINTPND |=(1<<5);//指示中断状态，0 无中断请求，1 时有中断请求 Uart_Printf("EINT8 is occurred.\n"); }*/ U8 Key_Scan( void ) { Delay( 8000 ) ; if( (rGPGDAT&(1<< 0)) == 0 ) return 1 ; else if( (rGPGDAT&(1<< 3)) == 0 ) return 2; else if( (rGPGDAT&(1<< 5)) == 0 ) return 3 ; else if( (rGPGDAT&(1<< 6)) == 0 ) return 4 ; else if( (rGPGDAT&(1<< 7)) == 0 ) return 5 ; else if( (rGPGDAT&(1<<11)) == 0 ) else return 6 ; return 0xff; } static void __irq Key_ISR(void) 

{ //U32 r; //EnterCritical(&r); if(rINTPND==BIT_EINT8_23) { ClearPending(BIT_EINT8_23); if(rEINTPEND&(1<<8)) { //Uart_Printf("eint11\n"); rEINTPEND |= 1<< 8; } if(rEINTPEND&(1<<11)) { //Uart_Printf("eint11\n"); rEINTPEND |= 1<< 11; } if(rEINTPEND&(1<<13)) { //Uart_Printf("eint11\n"); rEINTPEND |= 1<< 13; if(rEINTPEND&(1<<14)) { //Uart_Printf("eint11\n"); rEINTPEND |= 1<< 14; if(rEINTPEND&(1<<15)) { //Uart_Printf("eint11\n"); rEINTPEND |= 1<< 15; if(rEINTPEND&(1<<19)) { // Uart_Printf("eint19\n"); rEINTPEND |= 1<< 19; } } } } } key=Key_Scan(); if( key == 0xff ) Uart_Printf( "Interrupt occur... Key is released!\n") ; else Uart_Printf( "Interrupt occur... K%d is pressed!\n", key) ; //ExitCritical(&r); } void xmain(void) { 

//405MHZ ChangeClockDivider(3,1); ChangeMPllValue(127,2,1); MMU_Init(); Isr_Init(); Uart_Init(0, 115200); Uart_Select(0); Uart_Printf("the main is running.\n"); //-----------------中断初始化----------------// //选择功能管脚 //rGPGCON = rGPGCON & (~(3<<0) |(2<<0) ); //rGPGCON &(0x82);//当 GPG0 取 10 时，表示 EINT8，即 K1 rGPGCON =rGPGCON & (~((3<<22)|(3<<6)|(3<<0)|(3<<10)|(3<<12)|(3<<14))) | ((2<<22)|(2<<6)|(2<<0)|(2<<10)|(2<<12)|(2<<14)); p144 //中断模式 rINTMOD = rINTMOD & ( ~(1<<5) );//EINT8-23：外部中断 8~23 //触发方式 p154 //rEXTINT1 = ( rEXTINT1 | (7<<0) ) & ( ~(4<<0) );//EINT8 falling edge triggered rEXTINT1 &= ~(7|(7<<0)); rEXTINT1 |= (0|(0<<0)); //EXTINT1 用于设置 EINT15~EINT8 触发信号的类型 p146 rEXTINT1 &= ~(7|(7<<12)); rEXTINT1 |= (0|(0x0<<12)); //EXTINT1 用 于 设 置 EINT15~EINT8 触 发 信 号 的 类 型 p146 rEXTINT1 &= ~(7<<20); rEXTINT1 |= (0<<20); rEXTINT1 &= ~(7<<24); rEXTINT1 |= (0<<24); rEXTINT1 &= ~(7<<28); rEXTINT1 |= (0<<28); //set eint13 falling edge int //set eint14 falling edge int //set eint15 falling edge int rEXTINT2 &= ~(0xf<<12); rEXTINT2 |= (0<<12); //set eint19 falling edge int //使能中断 rINTMSK = rINTMSK & ( ~(1<<5) );//设定被中断屏蔽，0 为中断服务有效，1 为中断服务屏 蔽 p154 //清中断 

//rSRCPND |= (1<<8);//to clear EINT8 //rEINTPEND |= ~(1<<8); //clear eint 8 rEINTMASK &= ~((1<<8)|(1<<11)|(1<<13)|(1<<14)|(1<<15)|(1<<19)); //p148 外部中断掩 码寄存器,[3:0]保留取值 0，[23:4]控制相应的 EINT[23:4]，清零使能相应的中断，置 1 时屏 蔽中断 // rEINTMASK &= ~((1<<11)); //enable eint11 //中断向量 //pISR_EINT0 = (U32)EINT0_ISR;//EINT0 //ExitCritical(&r); while(1) Uart_Printf("the main is running.\n"); Delay(50000000); pISR_EINT8_23 = (U32)Key_ISR; { } } 1、MMU 一定要在主函数里面开启。否则会出现 dummy is busy............错误 2、请中断的时候一定要按顺序请中断，这个在上面程序注释里面已经有了。否则会无法正 常中断。