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我用DS1302做一个电子钟，碰到一个很奇怪的问题。我把小时寄存器的位7置1应该是AM/PM制的，但是程序判断不为0处理成24小时制。我把位7置0，能正常运行在24小时制下。附代码段，高手帮我看看问题出在哪里。<br />下面这个是我用来判断24制还是12制：<br />if((time[2]&0x80)==0x80)//判断小时寄存器位7是否为1<br /> {<br /> if((time[2]&0x20)==0x20)//判断小时寄存器位5是否为1，1为PM，0为AM<br /> {<br /> displaystring(0,0,"PM");<br /> }<br /> else<br /> displaystring(0,0,"AM");<br /> displaychar(2,0,number[(time[2]&0x10)>>4]);//进制转换并显示<br /> }<br /> else<br /> {<br /> if((time[2]&0x20)==0x20)<br /> displaychar(2,0,number[2]);<br /> displaychar(2,0,number[(time[2]&0x10)>>4]);<br /> }<br />这个函数是用来控制时钟开或关和24制或12制。<br />void settimetype(bit timeoff,bit ampm)<br />{<br /> unsigned char temp1;<br /> if(timeoff) //1为关闭时钟，0开启时钟<br /> {<br /> temp1=read1302(otimeaddress[0]);<br /> temp1|=0x80;<br /> write1302(0x8e,0x00);<br /> write1302(itimeaddress[0],temp1);<br /> write1302(0x8e,0x80);<br /> }<br /> else<br /> {<br /> temp1=read1302(otimeaddress[0]);<br /> temp1&=0x7f;<br /> write1302(0x8e,0x00);<br /> write1302(itimeaddress[0],temp1);<br /> write1302(0x8e,0x80);<br /> }<br /> if(ampm)//1为12小时制，0为24小时制<br /> {<br /> temp1=read1302(otimeaddress[2]);<br /> temp1|=0x80;<br /> write1302(0x8e,0x00);<br /> write1302(itimeaddress[2],temp1);<br /> write1302(0x8e,0x80);<br /> }<br /> else<br /> {<br /> temp1=read1302(otimeaddress[2]);<br /> temp1&=0x7f;<br /> write1302(0x8e,0x00);<br /> write1302(itimeaddress[2],temp1);<br /> write1302(0x8e,0x80);<br /> }<br />} |
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