#include <stdio.h>
//對(duì)8bit數(shù)據(jù)的NRZI編碼 
int main(void)
{
 int i , j;
 unsigned char RawData = 0x00 ; //0000 0000
 unsigned char NRZI_Data ;
 unsigned char buffer[8] ;
 unsigned char state = 1 , _state;
 //打印原始數(shù)據(jù) 
 printf("RawData:0x%x\n",RawData);
 //處理8bit數(shù)據(jù)，將數(shù)據(jù)保存到數(shù)組里 
 for(i = 0 ; i < 8 ; i ++)
 {
 //如果最高位為1時(shí) 
 //如果為1，翻譯成電平不翻轉(zhuǎn)
 if(RawData & 0x80) 
  buffer[i] = _state ;
 else 
 {
  //設(shè)置一個(gè)空閑位idle，后面NRZI變化的時(shí)候也要關(guān)注它 
  if(state == 1)
  {
  buffer[i] = !state ; 
  state = -1 ;
  goto __flag ;
  }
  buffer[i] = !_state ;
 }
 //保持上一個(gè)數(shù)據(jù)的狀態(tài) 
 __flag:
 _state = buffer[i] ;
 RawData <<=1 ;
 }
 //組合 
 for(i = 0 , j = 7 ; i < 8 , j >= 0 ; i++ , j--)
 NRZI_Data |= buffer[i] << j ;
 printf("NRZI_Data:0x%x\n",NRZI_Data); 
 return 0 ;
}