https://blog.youkuaiyun.com/CK_LKzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/CK_LK/article/details/5951267https://blog.youkuaiyun.com/CK_LK/article/details/5951267CK_LKTue, 19 Oct 2010 14:42:00 +0800
首先，安装串口工具setserial ，命令： sudo apt-get install setserial，利用setserial工具查看串口情况，
 
$ sudo setserial /dev/ttyS0 -a
/dev/ttyS0, Line 0, UART: unknown, Port: 0x03f8, IRQ: 4
Baud_base: 115200, close_delay: 50, ]]>https://blog.youkuaiyun.com/CK_LK/article/details/5861139https://blog.youkuaiyun.com/CK_LK/article/details/5861139CK_LKFri, 03 Sep 2010 12:43:00 +0800https://blog.youkuaiyun.com/CK_LK/article/details/5857885https://blog.youkuaiyun.com/CK_LK/article/details/5857885CK_LKThu, 02 Sep 2010 12:03:00 +0800https://blog.youkuaiyun.com/CK_LK/article/details/5854930https://blog.youkuaiyun.com/CK_LK/article/details/5854930CK_LKWed, 01 Sep 2010 10:15:00 +0800https://blog.youkuaiyun.com/CK_LK/article/details/5854821https://blog.youkuaiyun.com/CK_LK/article/details/5854821CK_LKWed, 01 Sep 2010 09:46:00 +0800从main.c中的printf开始读这个函数。首先看printf函数的定义：
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static int printf(const char *fmt, ...)
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{
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    va_list args;
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    int i;
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    va_start(args, fmt);
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    write(1,print]]>https://blog.youkuaiyun.com/CK_LK/article/details/5854797https://blog.youkuaiyun.com/CK_LK/article/details/5854797CK_LKWed, 01 Sep 2010 09:38:00 +0800