单片机IO口应用-独立按键控制LED以及控制LED灯闪烁

if(LED==0)    输入低电平

延时函数

void Delay_xms(unsigned char ms)    //延时xms
{
    unsigned int i,j;
    for(i=0;i
        for(j=0;j<333;j++);    //空指令
    }
}

控制LED灯闪烁

方法一

void delay_xms(unsigned char ms)    //延时xms
{
    unsigned int i,j;
    for(i=0;i
        for(j=0;j<333;j++);    //空指令
    }
}

sbit LED1=P0^0;
 
sbit LED2=P0^1;
 
sbit LED3=P0^2;
 
sbit LED4=P0^3;
 
sbit LED5=P0^4;
 
sbit LED6=P0^5;
 
sbit LED7=P0^6;
 
sbit LED8=P0^7;

void main()
{
    while(1){
        LED1=0;delay(500);LED1=1;
        LED2=0;delay(500);LED2=1;
        LED3=0;delay(500);LED3=1;
        LED4=0;delay(500);LED4=1;
        LED5=0;delay(500);LED5=1;
        LED6=0;delay(500);LED6=1;
        LED7=0;delay(500);LED7=1;
        LED8=0;delay(500);LED8=1;
    }
}

方法二

void delay_xms(unsigned char ms)    //延时xms
{
    unsigned int i,j;
    for(i=0;i
        for(j=0;j<333;j++);    //空指令
    }
}

unsigned char LED_DAT[8]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};

void main(){
    while(1){
        unsigned char i;
        for(i=0;i<8;i++){
            P0=LED_DAT[i];
            delay_xms(500);
        }
    }
}

方法三

void delay_xms(unsigned char ms)    //延时xms
{
    unsigned int i,j;
    for(i=0;i
        for(j=0;j<333;j++);    //空指令
    }
}

void main(){
    while(1){
        unsigned char temp=0xfe,i;
        temp=0xfe;    //1111 1110  -> 1111 1101  -> 1111 1011
        for(i=0;i<8;i++){
            P0=temp;
            temp=(temp<<1)+1;
            delay_xms(500);
        }
    }
}