时钟芯片rx8025t芯片读取，小时超出24小时，请问是什么原因？

MinionsDave

时钟芯片rx8025t芯片读取，小时超出24小时，请问是什么原因？ [复制链接]

<ignore_js_op> <img style="cursor:pointer;" id="aimg_761431" aid="761431" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202312/08/204617w0k399ksjz8dsghg.jpg" file="data/attachment/forum/202312/08/204617w0k399ksjz8dsghg.jpg.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_761431_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>WechatIMG21053.jpg</strong> <em class="xg1">(377.12 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_761431" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=761431&handlekey=savephoto_761431">保存到相册</a> </p> <p class="xg1 y">2023-12-8 20:46 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 这是i2c返回的结果 小时是第三个字节，0x36，转成bcd然后10进制是36，直接超出24小时了 ```C #include <stdio.h> unsigned char bcd_decimal(unsigned char bcd) { return bcd - (bcd >> 4) * 6; } int main(void) { unsigned char buf[7] = {0x18, 0x27, 0x36, 0x00, 0x08, 0x12, 0x23}; printf("date -s %04d-%02d-%02d %02d:%02d:%02d\n", 2000 + bcd_decimal(buf[6]), bcd_decimal(buf[5]), bcd_decimal(buf[4]), bcd_decimal(buf[2] & 0x3f), bcd_decimal(buf[1]), bcd_decimal(buf[0])); return 0; } ``` 输出结果是 ```shell ➜ gcc hello.c && ./a.out date -s 2023-12-08 36:27:18 ``` 参数解析： <ignore_js_op> <img style="cursor:pointer;" id="aimg_761432" aid="761432" src="static/image/common/none.gif" onclick="zoom(this, this.getAttribute('zoomfile'), 0, 0, '0')" zoomfile="data/attachment/forum/202312/08/204830muoa666qyl2gvg6t.png" file="data/attachment/forum/202312/08/204830muoa666qyl2gvg6t.png.thumb.jpg" inpost="1" onmouseover="showMenu({'ctrlid':this.id,'pos':'12'})" /> <div class="tip tip_4 aimg_tip" id="aimg_761432_menu" style="position: absolute; display: none" disautofocus="true"> <div class="xs0"> <p><strong>iShot_2023-12-08_19.46.38.png</strong> <em class="xg1">(340.68 KB, 下载次数: 0)</em></p> <p> <a href="javascript:;" class="loginf" >下载附件</a> <a href="javascript:;" onclick="showWindow(this.id, this.getAttribute('url'), 'get', 0);" id="savephoto_761432" url="home.php?mod=spacecp&ac=album&op=saveforumphoto&aid=761432&handlekey=savephoto_761432">保存到相册</a> </p> <p class="xg1 y">2023-12-8 20:48 上传</p> </div> <div class="tip_horn"></div> </div> </ignore_js_op> 具体规格书：[点击](https://cika.com.ar/soporte/Information/Semiconductores/CIespeciales/RX-8025T_Epson.pdf� "点击")