#include 
//对8bit数据的NRZI编码 
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;
 //打印原始数据 
 printf("RawData:0x%x\n",RawData);
 //处理8bit数据，将数据保存到数组里 
 for(i = 0 ; i < 8 ; i ++)
 {
 //如果最高位为1时 
 //如果为1，翻译成电平不翻转
 if(RawData & 0x80) 
  buffer[i] = _state ;
 else 
 {
  //设置一个空闲位idle，后面NRZI变化的时候也要关注它 
  if(state == 1)
  {
  buffer[i] = !state ; 
  state = -1 ;
  goto __flag ;
  }
  buffer[i] = !_state ;
 }
 //保持上一个数据的状态 
 __flag:
 _state = buffer[i] ;
 RawData <<=1 ;
 }
 //组合 
 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 ;
}