C语言宏定义结合全局变量的方法实现单片机串口透传模式

MODULE1作为模块1输出的一个标志，当不需要其它调试信息的干扰，只需要模块1输出的时候，Module1_Debug宏有效，其余无效。MODULE2也是同样的道理。

用标准C语言模拟这个过程：

#include <stdio.h>
//条件标志位,根据条件标志位决定打印的内容 
int debug_condition = 0 ;
#define GENERAL_DEBUG 0 
#define MODULE1    1 
#define MODULE2    2 
#define DEBUG(cond,...) 
 if(cond == GENERAL_DEBUG) 
  printf(__VA_ARGS__)
#define Module1_Debug(cond,...) 
 if(cond == GENERAL_DEBUG || cond == MODULE1) 
  printf(__VA_ARGS__)
#define Module2_Debug(cond,...) 
 if(cond == GENERAL_DEBUG || cond == MODULE2) 
  printf(__VA_ARGS__)  
int main(void)
{
 int cmd = 0 ;
 start:
 printf("请输入命令:n");
 scanf("%d",&cmd);
 //将输入的命令转发给全局变量 
 debug_condition = cmd ;
 switch(debug_condition)
 {
 case GENERAL_DEBUG:
  DEBUG(debug_condition,"jeadlaksl;dkl;akn");
  Module1_Debug(debug_condition,"Hello world %d %d %d %dn",1,2,3,4);
  Module2_Debug(debug_condition,"Hello%dn",1);
  break ;
 case MODULE1:
  DEBUG(debug_condition,"jeadlaksl;dkl;akn");
  Module1_Debug(debug_condition,"Hello world %d %d %d %dn",1,2,3,4);
  Module2_Debug(debug_condition,"Hello%dn",1);
  break ;
   case MODULE2: 
  DEBUG(debug_condition,"jeadlaksl;dkl;akn");
  Module1_Debug(debug_condition,"Hello world %d %d %d %dn",1,2,3,4);
  Module2_Debug(debug_condition,"Hello%dn",1);
  break ;
 default:
  printf("命令输入有误!n");
  goto start;
  break; 
 } 
 return 0 ;
}