#include <stdio.h>
//對8bit數據的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;
 //打印原始數據 
 printf("RawData:0x%x\n",RawData);
 //處理8bit數據，將數據保存到數組里 
 for(i = 0 ; i < 8 ; i ++)
 {
 //如果最高位為1時 
 //如果為1，翻譯成電平不翻轉
 if(RawData & 0x80) 
  buffer[i] = _state ;
 else 
 {
  //設置一個空閑位idle，后面NRZI變化的時候也要關注它 
  if(state == 1)
  {
  buffer[i] = !state ; 
  state = -1 ;
  goto __flag ;
  }
  buffer[i] = !_state ;
 }
 //保持上一個數據的狀態(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 ;
}