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#include<reg51.h> sbit DIN=P3^0;//与max7219接口定义 sbit LOAD=P3^1; sbit CLK=P3^2; sbit key0=P1^0;//8路抢答器按键 sbit key1=P1^1; sbit key2=P1^2; sbit key3=P1^3; sbit key4=P1^4; sbit key5=P1^5; sbit key6=P1^6; sbit key7=P1^7; sbit key_clear=P2^0;//主持人时间设置、清除 sbit begin=P2^1;//主持人开始按键 sbit sounder=P3^7;//蜂鸣器 unsigned char second=30;//秒表计数值 unsigned char counter=0;//counter每100，minite加1 unsigned char people=0;//抢答结果 unsigned char num_add[]={0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08};//max7219读写地址、内容 unsigned char num_dat[]={0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89}; unsigned char keyscan()//键盘扫描函数 { unsigned char keyvalue,temp; keyvalue=0; P1=0xff; temp=P1; if(~(P1&temp)) { switch(temp) { case 0xfe: keyvalue=1; break; case 0xfd: keyvalue=2; break; case 0xfb: keyvalue=3; break; case 0xf7: keyvalue=4; break; case 0xef: keyvalue=5; break; case 0xdf: keyvalue=6; break; case 0xbf: keyvalue=7; break; case 0x7f: keyvalue=8; break; default: keyvalue=0; break; } } return keyvalue; } void max7219_send(unsigned char add,unsigned char dat)//向max7219写指令函数 { unsigned char ADS,i,j; LOAD=0; i=0; while(i<16) { if(i<8) { ADS=add; } else { ADS=dat; } for(j=8;j>=1;j--) { DIN=ADS&0x80; ADS=ADS<<1; CLK=1; CLK=0; } i=i+8; } LOAD=1; } void max7219_init()//max7219初始化函数 { max7219_send(0x0c,0x01); max7219_send(0x0b,0x07); max7219_send(0x0a,0xf5); max7219_send(0x09,0xff); } void time_display(unsigned char x)//时间显示 { unsigned char i,j; i=x/10; j=x%10; max7219_send(num_add[1],num_dat[j]); max7219_send(num_add[0],num_dat[i]); } void scare_display(unsigned char x)//抢答结果显示 { unsigned char i,j; i=x/10; j=x%10; max7219_send(num_add[3],num_dat[j]); max7219_send(num_add[2],num_dat[i]); } void holderscan()//抢答时间设置，0-60s { time_display(second); scare_display(people); if(~key_clear)//如果有键按下，改变抢答时间 { while(~key_clear); if(people)//如果抢答结果没有清空，抢答器重置 { second=30; people=0; } if(second<60) { second++; } else { second=0; } } } void timer_init() { EA=1; ET0=1; TMOD=0x01; TH0=0xd8;//设定10ms中断一次 TL0=0xef; } void main() { while(1) { do{ holderscan(); }while(begin);//开始前进行设置,若未按下开始键 while(~begin);//防抖 max7219_init(); //芯片初始化 timer_init(); //中断初始化 TR0=1; //开始中断 do{ time_display(second); scare_display(people); people=keyscan(); }while((!people)&&(second));//运行直到抢答结束或者时间结束 TR0=0; } } void timer0() interrupt 1 { if(counter<100) { counter++; if(counter==50) { sounder=0; } } else { sounder=1; counter=0; second=second-1; } TH0=0xd8;//重新装载 TL0=0xef; TR0=1; } |
