https://blog.youkuaiyun.com/Gauchyzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/Gauchy/article/details/6654463https://blog.youkuaiyun.com/Gauchy/article/details/6654463GauchyTue, 02 Aug 2011 16:59:23 +0800https://blog.youkuaiyun.com/Gauchy/article/details/6649584https://blog.youkuaiyun.com/Gauchy/article/details/6649584GauchyMon, 01 Aug 2011 09:21:31 +0800https://blog.youkuaiyun.com/Gauchy/article/details/6030257https://blog.youkuaiyun.com/Gauchy/article/details/6030257GauchyTue, 23 Nov 2010 17:20:00 +0800
上、下拉电阻
一、定义
1、上拉就是将不确定的信号通过一个电阻嵌位在高电平！“电阻同时起限流作用”！下拉同理！
2、上拉是对器件注入电流，下拉是输出电流
3、弱强只是上拉电阻的阻值不同，没有什么严格区分
4、对于非集电极（或漏极）开路输出型电路（如普通门电路）提升电流和电压的能力是有限的，上拉电阻的功能主要是为集电极开路输出型电路输出电流通道。
二、拉电阻作用
1、一般作单键触发使用时，如果IC本身没有内接电阻，为]]>https://blog.youkuaiyun.com/Gauchy/article/details/6030248https://blog.youkuaiyun.com/Gauchy/article/details/6030248GauchyTue, 23 Nov 2010 17:17:00 +0800 
1、概念
      拉电流和灌电流是衡量电路输出驱动能力（注意：拉、灌都是对输出端而言的，所以是驱动能力）的参数 ，这种说法一般用在数字电路中。
      这里首先要说明，芯片手册中的拉、灌电流是一个参数值，是芯片在实际电路中允许输出端拉、灌电流的上限值（允许最大值）。而下面要讲的这个概念是电路中的实际值。
      由于数字电路的输出只有高、低（0，1）两种电平值，高电平输出时，一般是输出端对负载提供电流，其提供电流的数值叫“拉电]]>https://blog.youkuaiyun.com/Gauchy/article/details/5832448https://blog.youkuaiyun.com/Gauchy/article/details/5832448GauchyMon, 23 Aug 2010 17:04:00 +0800Wednesday, August 5th, 2009 by Nigel Jones
One of the interesting things about writing a blog is looking at the search terms that drive traffic to your blog. In my case, after I posted these though]]>https://blog.youkuaiyun.com/Gauchy/article/details/5831921https://blog.youkuaiyun.com/Gauchy/article/details/5831921GauchyMon, 23 Aug 2010 14:51:00 +0800 by Michael Barr
This next installment of enforceable coding standards for embedded systems offers bug-killing rules for using certain C keywords and naming global variables.
In "Bug-Killing Coding Standard Rules for Embedded C ,"]]>https://blog.youkuaiyun.com/Gauchy/article/details/5831903https://blog.youkuaiyun.com/Gauchy/article/details/5831903GauchyMon, 23 Aug 2010 14:47:00 +0800 by Michael Barr
A C coding standard can help keep bugs out of embedded software by leveraging common language features and development tools.
A coding standard defines a set of rules for programmers to follow in a given language. ]]>https://blog.youkuaiyun.com/Gauchy/article/details/5739158https://blog.youkuaiyun.com/Gauchy/article/details/5739158GauchyFri, 16 Jul 2010 11:11:00 +0800在对话框程序中，如果回车没有设定动作的话，会与Esc键一样，将对话框关闭，给用户造成困扰。要解决该问题，需要拦截消息。
首先在对话框程序中添加PreTranslateMessage()函数，在函数中对回车和Esc键的按下进行转发，不进行任何处理。参考自MFC GridControl2.26的demo。
 
    if( pMsg->message == WM_KEYDOWN )
    {
        if(pMsg->wParam]]>https://blog.youkuaiyun.com/Gauchy/article/details/5721468https://blog.youkuaiyun.com/Gauchy/article/details/5721468GauchyThu, 08 Jul 2010 17:26:00 +0800程序中需要实现打印出库单和入库单，本来以为挺简单的，因为Grid Control本身提供了print()函数，只需要新建一个对话框，添加上Grid Control，根据需要的格式打印即可。在实际实现时发现存在较大的问题，从网上找到比较好的出库单和入库单的格式并不容易实现，特别是有标题，还有单号、仓库名称、时间等单子的信息，这与单内的数据项不一致，而Grid Control仅仅能打印其内部的数据，这样一来除非是将两个Grid的内容打印在同一张纸上，否则不能利用其本身的print()函数。
https://blog.youkuaiyun.com/Gauchy/article/details/5715808https://blog.youkuaiyun.com/Gauchy/article/details/5715808GauchyTue, 06 Jul 2010 13:36:00 +0800MFC Grid control 是个很好的东东，在进行数据库程序开发的过程中，提供了很大的方便。上周六在实现显示内容打印的时候出现了一点问题，那就是打印的标题字段显示不全，虽然在程序中是全部显示的，也设置了EnableWysiwygPrinting，可每次都是一部分内容显示为“...”
m_GridStoreSelect.EnableWysiwygPrinting();
仔细查看Demo，发现它的打印时没有问题的，能正确显示（都是只调用了grid控件的print()），wh]]>https://blog.youkuaiyun.com/Gauchy/article/details/5518292https://blog.youkuaiyun.com/Gauchy/article/details/5518292GauchyFri, 23 Apr 2010 08:51:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5509922https://blog.youkuaiyun.com/Gauchy/article/details/5509922GauchyWed, 21 Apr 2010 09:44:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5481910https://blog.youkuaiyun.com/Gauchy/article/details/5481910GauchyTue, 13 Apr 2010 16:58:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5458315https://blog.youkuaiyun.com/Gauchy/article/details/5458315GauchyWed, 07 Apr 2010 15:01:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5458303https://blog.youkuaiyun.com/Gauchy/article/details/5458303GauchyWed, 07 Apr 2010 14:59:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5368997https://blog.youkuaiyun.com/Gauchy/article/details/5368997GauchyThu, 11 Mar 2010 13:48:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5367619https://blog.youkuaiyun.com/Gauchy/article/details/5367619GauchyThu, 11 Mar 2010 10:28:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5305333https://blog.youkuaiyun.com/Gauchy/article/details/5305333GauchyWed, 10 Feb 2010 17:08:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5188448https://blog.youkuaiyun.com/Gauchy/article/details/5188448GauchyThu, 14 Jan 2010 09:07:00 +0800https://blog.youkuaiyun.com/Gauchy/article/details/5106667https://blog.youkuaiyun.com/Gauchy/article/details/5106667GauchyWed, 30 Dec 2009 15:33:00 +0800