1.硬件
2.软件
#include "reg52.h" typedef unsigned int u16;
typedef unsigned char u8;#define GPIO_DIG P0
#define GPIO_KEY P1u8 KeyValue; u8 code smgduan[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};void delay(u16 i)
{while(i--);
}void KeyDown(void)
{char a=0;GPIO_KEY=0x0f;if(GPIO_KEY!=0x0f){delay(1000);if(GPIO_KEY!=0x0f){ GPIO_KEY=0X0F;switch(GPIO_KEY){case(0X07): KeyValue=0;break;case(0X0b): KeyValue=1;break;case(0X0d): KeyValue=2;break;case(0X0e): KeyValue=3;break;}GPIO_KEY=0XF0;switch(GPIO_KEY){case(0X70): KeyValue=KeyValue;break;case(0Xb0): KeyValue=KeyValue+4;break;case(0Xd0): KeyValue=KeyValue+8;break;case(0Xe0): KeyValue=KeyValue+12;break;}}}while((a<50)&&(GPIO_KEY!=0xf0)) {delay(100);a++;}
}void main()
{ while(1){ KeyDown(); GPIO_DIG=smgduan[KeyValue]; }
}
3.实物效果

- 硬件接线

