嵌入式——按键灯控制

来源：互联网发布：二维坐标转换矩阵编辑：程序博客网时间：2024/05/22 01:50
实验结果：按左键led灯向左亮，按右键led灯向右亮
void  __irq int_int(void);             //声明中断服务函数     int flag=0;                         //定义一个标志位void led_Y(void)                    //小灯自左向右依次亮灭{int i,nOut;nOut = 0xF0;rCPLDLEDADDR = nOut | 0x0F;for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut | 0x07; for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut | 0x03; for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut | 0x01; for(i = 0; i < 100000; i++);nOut = 0xFF;rCPLDLEDADDR = nOut & 0xF0;for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut & 0xF8;  for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut & 0xFC;   for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut & 0xFE;  for(i = 0; i < 100000; i++);}void led_Z(void)                     //小灯自右向左依次亮灭{int i,nOut;nOut = 0xFF;rCPLDLEDADDR = nOut & 0xFE;for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut & 0xFC;  for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut & 0xF8;   for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut & 0xF0;  for(i = 0; i < 100000; i++);nOut = 0xF0;rCPLDLEDADDR = nOut | 0x01;for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut | 0x03; for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut | 0x07; for(i = 0; i < 100000; i++);rCPLDLEDADDR = nOut | 0x0F; for(i = 0; i < 100000; i++);}void led_m(void){int i;rCPLDLEDADDR = 0xFF;for(i = 0; i < 100000; i++);}中断程序  void  __irq int_int(void){ unsigned char Status;Status = rCPLDIntStatus;    //中断状态是低有效Status = ~(Status & 0x6);    //将状态取反      if(Status & 0x2)         //查询键和控制处理{flag=0;uart_printf(" Eint0 interrupt occurred.\n");rCPLDIntControl |= (1<<1);rCPLDIntControl &= ~(1<<1);}else if(Status & 0x4){flag=1;uart_printf(" EINT1 interrupt occurred.\n");rCPLDIntControl |= (1<<2);rCPLDIntControl &= ~(1<<2);} rEINTPEND=(1<<9);       //禁止外部中断EINT8    ClearPending(BIT_EINT8_23);}按键初始化void int_init(void) {    rSRCPND = rSRCPND;               // Clear all interrupt    rINTPND = rINTPND;                // Clear all interrupt                                                       // nIntMode='3'; rGPGCON |= (0xf<<0);    rGPGCON &= (0xa<<0);rCPLDIntControl = 0xFF;                        //控制寄存器 中断允许控制rCPLDIntControl = 0xF9;pISR_EINT8_23=(UINT32T)int_int;            //中断服务地址填到中断向量表rEINTPEND = 0xffffff;                       //外部中断请求设置全1rSRCPND = BIT_EINT8_23;     // Clear the previous pending statesrINTPND = BIT_EINT8_23;                   //记录CPU正在处理的中断源rEXTINT1 &= ~((0x7<<4)|(0x7<<0));           //电平  控制EINT8为下降沿触发rEXTINT1 |= ((0x2<<4)|(0x2<<0));rEINTMASK &= ~(3<<8);                   //外部中断屏蔽寄存器，允许EINT8,9rINTMSK   &= ~(BIT_EINT8_23);}主程序void int_test(void){uart_printf("\n External Interrupt Test Example\n");int_init();while(1)                //等待中断，循环{if(flag==0)          //标志位为0，灯向左亮；为1，灯向右亮led_Z();elseled_Y();}}
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