ARM按键控制蜂鸣器方法汇总程序代码.doc

定时器法：# include config.h# define Beepcon 10# define KEY 18uint8 N=1;void _irq IRQ_Time0(void) IOSET=Beepcon; if(N!=0) IOCLR=Beepcon; T0IR = 0x01; / 清除中断标志 VICVectAddr = 0x00; / 通知VIC中断处理结束void Time0Init(void) T0PR = 99; / 设置定时器0分频为100分频，得110592HzT0MCR = 0x03; / 匹配通道0匹配中断并复位T0TCT0MR0 = 11059/N; / 比较值(1S定时值)T0TCR = 0x03; / 启动并复位T0TCT0TCR = 0x01; /* 设置定时器0中断IRQ */VICIntSelect = 0x00;/ 所有中断通道设置为IRQ中断VICVectCntl0 = 0x24;/ 定时器0中断通道分配最高优先级(向量控制器0)VICVectAddr0 =(uint32) IRQ_Time0; / 设置中断服务程序地址向量 VICIntEnable = 0x00000010;/ 使能定时器0中断int main(void) PINSEL0 = 0x00000000;/ 设置管脚连接GPIO IODIR =Beepcon; / 设置P0.0P0.7为输出,其他为输入 Time0Init();/ 初始化定时器0及使能中断 while(1)/ 等待定时器0中断或定时器1匹配输出 if(IOPIN&KEY)=0) if(N11) N+;else N=1; return(0);查询法：# includeconfig.h# define Beepcon 10# define KEY 10;dly-) for(i=0;i5000;i+); int main(void) PINSEL0=0x00000000; IODIR=Beepcon; while(1) if(IOPIN&KEY)=0) if(N11) N+;else N=1; if(N!=0) IOCLR=Beepcon; DelayNS(1000*N); IOSET=Beepcon; DelayNS(1000*N); return(0); 不按不响法：# includeconfig.h# define Beepcon 10# define KEY 10;dly-) for(i=0;i5000;i+); int main(void) PINSEL0=0x00000000; IODIR=Beepcon; while(1) if(IOPIN&KEY)=0) if(N11) N+;else N=1; if(N!=0) IOCLR=Beepcon; DelayNS(1000*N); IOSET=Beepcon; DelayNS(1000*N); return(0); 中断法：# includeconfig.h# define Beepcon 10# define KEY 10;dly-) for(i=0;i5000;i+); void EINT0_ISR(void) if(N!=1) IOCLR=Beepcon; DelayNS(100*N); IOSET=Beepcon; DelayNS(100*N); else IOCLR=Beepcon; DelayNS(100); IOSET=Beepcon; DelayNS(100); T0IR=0x01; VICVectAddr0=0x00;int main(void) PINSEL0=0x00000000; IODIR=Beepcon; PINSEL1=0x00000001; EXTMODE=0x00000001; EXTPOLAR=0x000000e; VICIntSelect=114; VICVectCntl0=0