stc15w4k56s4会偶尔算错crc

1南城***

使用芯片stc15w4k56s4,串口1接收命令，串口2，3依次下发命令。发送偶尔就来一次crc算错了，下一帧crc又好了。计算错误在串口发送之前，很神奇，是指针用的有问题吗？

unsigned char motor_s3_long[13]={0x7f,0x10,0x06,0x06,0x00,0x02,0x04,0x0b,0xb1,0x00,0x00,0x94,0x0f};
void Message_Composed2_Long(uint address,uint cmds_1,uint cmds_2)
{ 
  motor_s3_long[2] =address/256;
  motor_s3_long[3] =address%256;
  motor_s3_long[7] =cmds_1/256;
  motor_s3_long[8] =cmds_1%256;
  motor_s3_long[9] =cmds_2/256;
  motor_s3_long[10]=cmds_2%256;
}
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void S3_Send_RS485(unsigned char *sendline,unsigned char length)
{
  unsigned char i=0, j=0,n=0; 
  unsigned short reg_crc=0xffff;
         //crc计算-----------------------------//
  while((i<(length-2)))
  {
    reg_crc^= sendline[i];        
    for (j=0; j<8; j++ ) 
   {
      if( reg_crc & 0x01 ) 
     { 
       reg_crc = (reg_crc >> 1)^0xA001;
     } 
     else 
    {
         reg_crc = (reg_crc>>1);
    }
   }
   i++;
                }         
  sendline[length-1]=(reg_crc/256)%256;
  sendline[length-2]=reg_crc%256;
                 
    RS485_2 = 1;
    for(n=0;n<length;n++)
    {
        S3_SendByte(sendline[n]);
     }  
     RS485_2 = 0;
}
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Message_Composed2_Long(ASD6003,by_speed2,0x0000);
 S3_Send_RS485(motor_s3_long,13);
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