蓝桥杯单片机学习感悟【02-蜂鸣器与继电器的基本应用】
本帖最后由 华罗聪 于 2023-1-5 11:20 编辑那&符号是表示与的意思， &只有1&1的时候才是1，其他都是0，而 | 则相反，只有0 | 0的时候才是0
电路图
ULN2003达林顿管——输入和输出是相反的
代码呈现：
#include "reg52.h"
sbit HC138_A=P2^5;
sbit HC138_B=P2^6;
sbit HC138_C=P2^7;
void Delay(unsigned int t)
{
while(t--);
while(t--);
}
void HC138(unsigned char n)
{
switch(n)
{
case 4: //P2=(P2&0xlf)|0x80;
HC138_C=1;
HC138_B=0;
HC138_A=0;
break;
case 5: //P2=(P2&0xlf)|0xa0;
HC138_C=1;
HC138_B=0;
HC138_A=1;
break;
case 6: //P2=(P2&0xlf)|0xc0;
HC138_C=1;
HC138_B=1;
HC138_A=0;
break;
case 7: //P2=(P2&0xlf)|0xe0;
HC138_C=1;
HC138_B=1;
HC138_A=1;
break;
}
}
void abcdef(unsigned char channel,unsigned char dat)
{
HC138(channel);
P0=dat;
}
void LEDRunning()
{
unsigned char i;
for(i=0;i<3;i++)
{
abcdef(4,0x00);
Delay(60000);
Delay(60000);
abcdef(4,0xff);
Delay(60000);
Delay(60000);
}
for(i=1;i<=8;i++)
{
P0=0xff<<i;
Delay(60000);
Delay(60000);
}
abcdef(5,0x10);
Delay(60000);
Delay(60000);
abcdef(5,0x00);
for(i=1;i<=8;i++)
{
abcdef(4,~(0xff<<i));
Delay(60000);
Delay(60000);
}
abcdef(5,0x40);
Delay(60000);
Delay(60000);
abcdef(5,0x00);
Delay(60000);
Delay(60000);
}
void InitSystem()
{
abcdef(5,0x00);
}
void main()
{
InitSystem();
while(1)
{
LEDRunning();
}
}
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