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  • 74HC595扩展按键扫描调试笔记

    问题出现在了按键扫描过程中,使用延时,但是为什么使用延时就检测不到,还是没琢磨明白。

    #include "hc595.h"
    
    /*-------------------------- 按键扫描程序 -----------------------------*/
    
    unsigned char keyscan(void) {     unsigned char Val;  SendByte(0x1b);  LINE_SET;
    
     if((P4&0x70)!=0x70)  {
    
       Val = P4&0x70;    Val+=0x1b;    while((P4&0x70)!=0x70);    delay_10ms(1);    while((P4&0x70)!=0x70);    return Val;
    
     }  SendByte(0x17);  LINE_SET;
    
     if((P4&0x70)!=0x70)  {
    
       Val = P4&0x70;    Val+=0x17;    while((P4&0x70)!=0x70);    delay_10ms(1);    while((P4&0x70)!=0x70);    return Val;
    
     }
    
     SendByte(0x0f);  LINE_SET;
    
     if((P4&0x70)!=0x70)  {
    
       Val = P4&0x70;    Val+=0x0f;    while((P4&0x70)!=0x70);    delay_10ms(1);    while((P4&0x70)!=0x70);    return Val;
    
     }  SendByte(0x1d);  LINE_SET;
    
     if((P4&0x70)!=0x70)  {
    
       Val = P4&0x70;    Val+=0x1d;    while((P4&0x70)!=0x70);    delay_10ms(1);    while((P4&0x70)!=0x70);    return Val;
    
     }  SendByte(0x1e);  LINE_SET;
    
     if((P4&0x70)!=0x70)  {
    
       Val = P4&0x70;    Val+=0x1e;    while((P4&0x70)!=0x70);    delay_10ms(1);    while((P4&0x70)!=0x70);    return Val;
    
     }
    
       return 0xff; }
    
     

     

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  • 原文地址:https://www.cnblogs.com/bytebee/p/2868286.html
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