[求助]LED计数问题！！！
问题如楼下: <p>那应该是p0.0亮阿</p><p>为什么是p0.1亮？</p> <p>所以如果加了那句，就是如果按键一直没有松开，程序就一直会在</p><p>while（p0_0==0）[空语句]；</p><p>里面的空语句执行？</p><p>不会出去？？</p> <p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">#include <AT89X51.H><p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">unsigned char count;<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">void delay10ms(void)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">{<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>unsigned char i,j;<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>for(i=20;i>0;i--)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>for(j=248;j>0;j--);<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">}<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><p><font face="Times New Roman"> </font></p></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">void main(void)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">{<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>while(1)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>{<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>if(P0_0==0)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>{<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>delay10ms();<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>if(P0_0==0)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>{<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>count++;<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>if(count==16)<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>{<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>count=0;<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>}<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>P0=~count;<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>while(P0_0==0);<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>}<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>}<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><span style="mso-spacerun: yes;"> </span>}<p></p></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 12pt; mso-line-height-rule: exactly;"><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman">}</font></span></p><span lang="EN-US" style="FONT-SIZE: 9pt;"><font face="Times New Roman"><p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><font size="3"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";"></span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><font size="4"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">功能:每按下一次开关KB</span><span lang="EN-US">1</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">，计数值加</span><span lang="EN-US">1</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">，通过</span><span lang="EN-US">AT89S52</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">单片机的</span><span lang="EN-US">P1</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">端口的</span><span lang="EN-US">P0.0</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">到</span><span lang="EN-US">P0.3</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">显示出其的二进制计数值。</span></font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";"><font size="4"></font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";"><font size="4">因为我们的学习板的设计是：键盘和LED是连在一起的。</font></span></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><font size="4"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman";">所以我上面的程序使用了p0.0作为按键。那么第一次按下KB1（p0.0）时候应该是LED1（也是p0.0）</span>亮。</font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><font size="4">但是我实际看到的现象是他是从led2开始计数的。也就是第一次按KB1，LED2会马上亮。</font></p><p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt 21pt; mso-para-margin-left: 2.0gd;"><font size="4">为什么会这样？</font></p></p></font></span> <p>还有一个问题:</p><p>程序尾部有这样一个语句：</p><p><font face="Times New Roman">while(P0_0==0);</font></p><p><font face="Times New Roman">好像没有什么用啊！！</font></p><p><font face="Times New Roman">作什么的呢？</font></p> <p><font face="Times New Roman">while(P0_0==0);</font></p><p><font face="Times New Roman">这个是等待键松开！</font></p> <font face="Times New Roman">第一次按count变为1，但是你这里P0=~count;按位取反一次，这时候P0等于1按位取反，是0xfe了，应该除按键1外的所有引键会变成为高电平了！</font>
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