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还没有调通，先记录一下吧：
1.Startup.s
preserve8 IMPORT keymain ; 声明C程序中的Main()函数 AREA Start,CODE,READONLY ; 声明代码段Start ENTRY ; 标识程序入口 CODE32 ; 声明32位ARM指令 ldr r0, =0x70000000 orr r0, r0, #0x13 mcr p15,0,r0,c15,c2,4 ;256M(0x70000 0000~0x7FFF FFFF)ARM协处理器相关 告诉协处理器外设寄存器的基地址和地址空间 ldr r0, =0x7E004000 mov r1, #0 str r1, [r0] ;关闭看门狗 ldr sp, =8*1024 ;设置C堆栈 PROC mrc p15,0,r0,c1,c0,0 orr r0,r0,#(1<<24) mcr p15,0,r0,c1,c0,0 ;禁止MMU和Cache mov pc,lr ;使能VICENDP ;mrs r0,cpsr ;bic r0,r0,#(1<<7) ;msr cpsr_cxsf,r0 ;mov pc,lr ;使能IRQ bl keymain END
2.key.c
//VIC总中端控制器#define rVIC0INTENABLE (*(volatile u32 *)(0x71200000 + 0x10))#define rVIC0INTENCLEAR (*(volatile u32 *)(0x71200000 + 0x14))#define rVIC0INTSELECT (*(volatile u32 *)(0x71200000 + 0x0c))#define rVIC0ADDR (*(volatile u32 *)(0x71200000 + 0xff))#define rVIC0VECTADDR (*(volatile u32 *)(0x71200000 + 0x100))//GPIO#define rGPIOFCON (*(volatile u32 *)0x7f0080a0) //连接蜂鸣器#define rGPIOFDAT (*(volatile u32 *)0x7f0080a4)#define rGPIONCON (*(volatile u32 *)0x7f008830) //连接按键#define rGPIONPUD (*(volatile u32 *)0x7f008838)//外部子中断控制器#define rEINT0CON0 (*(volatile u32 *)0x7f008900)#define rEINT0MASK (*(volatile u32 *)0x7f008920)#define rEINT0PEND (*(volatile u32 *)0x7f008924)typedef unsigned long u32;void __irq Isr_Eint(void);void GPIOFinit(void);void GPIONinit(void);void GPIONinit1(void);void EINT0init(void);void ENABLEvic0(void);void EINT0mask(void);int keymain(void){ //设置GPN0(连接KEY1)引脚为外部终端模式 GPIONinit(); GPIONinit1(); //设置GPF14(连接蜂鸣器)引脚为输出模式 GPIOFinit(); //设置外部子中断控制器，即GPN0(EINT0)为低电平触发中断 EINT0init(); //解除外部子中断EINT0/GPN0的中断屏蔽 EINT0mask(); //初始化VIC总中断控制器 //rVIC0INTENCLEAR = 0xffffffff; //rVIC0INTSELECT = 0x0; //rVIC0ADDR = 0; //设置总中断控制器中端服务程序入口地址 rVIC0VECTADDR = ((unsigned)Isr_Eint); ENABLEvic0(); while(1);}void __irq Isr_Eint(void){ u32 i; rEINT0PEND = 0x1; //清除中断 rGPIOFDAT |= 0x1<<14; //0000 0000 0000 0000 10000 0000 0000 0000 for(i=0;i<3000*100;i++); rGPIOFDAT &= ~(0x1<<14); //1111 1111 1111 1111 01111 1111 1111 1111 for(i=0;i<3000*100;i++); rVIC0ADDR = 0x0;}void GPIOFinit(void){ u32 fConValue; //设置GPF14(连接蜂鸣器)引脚为输出模式 fConValue = rGPIOFCON; fConValue &= ~(0x3<<28); //1100 1111 1111 1111 1111 1111 1111 1111 fConValue |= 0x1<<28; //0001 0000 0000 0000 0000 0000 0000 0000 rGPIOFCON = fConValue;}void GPIONinit(void){ u32 nConValue; //设置GPN0(连接KEY1)引脚为外部终端模式 //nConValue = rGPIONCON; nConValue &= ~(0x3); //1111 1111 1111 1111 1111 1111 1111 1100 nConValue |= 0x2; //0000 0000 0000 0000 0000 0000 0000 0010 rGPIONCON = nConValue;}void GPIONinit1(void){ u32 n1ConValue; n1ConValue = rGPIONPUD; n1ConValue &= ~(0x3); //1111 1111 1111 1111 1111 1111 1111 1100 n1ConValue |= 0x0; //0000 0000 0000 0000 0000 0000 0000 0000 rGPIONPUD = n1ConValue;}void EINT0init(void){ //设置外部子中断控制器，即GPN0(EINT0)为低电平触发中断 u32 eConValue; eConValue = rEINT0CON0; eConValue &= ~(0x7); //1111 1111 1111 1111 1111 1111 1111 1000 eConValue |= 0x0; //0000 0000 0000 0000 0000 0000 0000 0000 rEINT0CON0 = eConValue; rEINT0PEND = 0x1;}void ENABLEvic0(void){ u32 vConValue; vConValue = rVIC0INTENABLE; vConValue |= 0x1; //0000 0000 0000 0000 0000 0000 0000 0001 rVIC0INTENABLE = vConValue; }void EINT0mask(void){ u32 mConValue; mConValue = rEINT0MASK; mConValue &= ~(0x1); //1111 1111 1111 1111 1111 1111 1111 1110 rEINT0MASK = mConValue;}3.以下是基于Window下armcc编译器的Makefile all: armasm -o Startup.o Startup.s --debug --keep --cpu=ARM1176JZF-S armcc -c key.o key.c --debug --cpu=ARM1176JZF-S -O0 armlink -o mykey.axf Startup.o key.o --ro_base=0x50200000 --rw_base=0x50203000 --first=Startup.o(start) --entry=0x50200000 fromelf -o mykey.bin --bin mykey.axfclean: del *.o *.axf *.bin
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