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        <title>learing:advanced:2016042501</title>
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        <description>深入了解setup()与loop()函数

如果大家在学校学过C语言，就知道一定会有一个main()函数。但我们在给控制器编写程序时使用的是setup()与loop()，main()函数去哪里了？

我们从源码上一探究竟！

以OCROBOT 0005 IDE为例，我们打开IDE的hardware\avr\cores\avr\main.cpp文件，可以看到如下代码</description>
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        <description>程序烧录自动复位深入研究

近期市面上出现了不少SOP8或者SOP10封装的USB TO UART芯片，不过这些芯片统一都没有DTR管脚。在传统Arduino的电路中，一般都是通过DTR串联一个100nf电容，连接MEGA328的RESET管脚实现程序烧录过程的自动复位，那还是否有其他方法也可以实现自动复位功能呢？</description>
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        <description>ALPHA MEGA328P-U/MANGO II 16M晶振频率误差测试方法

ALPHA MEGA328P-U/MangoII所使用的MEGA328P MCU是可以直接把系统频率输出到D8管脚。

首先我们打开智峰，读取熔丝位，CKOUT熔丝位默认是1，也就是关闭状态。</description>
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        <description>树莓派GPIO详解

树莓派的每个GPIO可以独立地处于8种模式之一：INPUT，OUTPUT，ALT0，ALT1，ALT2，ALT3，ALT4，ALT5或ALT6。

GPIO一次只能处于一种模式。</description>
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