RC522读M1卡出现不断重复读取现象

1万 · 2019-11-8 21:30

按道理说，我在程序后面使卡进入休眠状态了，但是为什么会被重复读取呢？
程序如下：
int main(void)
{
      unsigned char status;
      //u8 Data[16];
      //u8 i;
      //u8 k;//读写错误重试次数
      u8 m;

      delay_init();                   //延时函数初始化
      NVIC_Configuration();       //设置NVIC中断分组2:2位抢占优先级，2位响应优先级
      OUTPUT_Init();                      //输出模块初始化
      uart_init(9600);
      LCD_Init();
      KEY_Init();
      InitRc522();                               //初始化射频卡模块
      //sprintf((char*)lcd_id,"LCD ID:%04X",lcddev.id);//将LCD ID打印到lcd_id数组。
      LEDA=1;
      while(1)
      {
                     status = PcdRequest(PICC_REQALL,CT);/*尋卡*/
                     if(status==MI_OK)//尋卡成功
                     {
                     printf("PcdRequest_MI_OK\t\n");
                     status=MI_ERR;
                     status = PcdAnticoll(SN);/*防冲撞*/
                     }

                     if (status==MI_OK)//防衝撞成功
                     {
                              printf("PcdAnticoll_MI_OK\t\n");
                              status=MI_ERR;
                              LEDA=1;
                              LEDB=1;
//                               ShowID(0,200,SN,BLUE,WHITE); //在液晶屏上显示卡的ID号
                              printf("ID:%02x %02x %02x %02x\t\n",SN[0],SN[1],SN[2],SN[3]);//发送卡号
                              if((SN[0]==card_1[0])&&(SN[1]==card_1[1])&&(SN[2]==card_1[2])&&(SN[3]==card_1[3]))
                              {
                                 printf("The User is:小明\t\n");
                              }
                              if((SN[0]==card_2[0])&&(SN[1]==card_2[1])&&(SN[2]==card_2[2])&&(SN[3]==card_2[3]))
                              {
                                 printf("The User is:小华\t\n");
                              }

                              if((SN[0]==card_3[0])&&(SN[1]==card_3[1])&&(SN[2]==card_3[2])&&(SN[3]==card_3[3]))
                              {
                                    printf("The User is:小李\t\n");
                              }

                              if((SN[0]==card_4[0])&&(SN[1]==card_4[1])&&(SN[2]==card_4[2])&&(SN[3]==card_4[3]))
                              {
                                       printf("The User is:小王\t\n");
                              }
//                               total=card1_bit+card2_bit+card3_bit+card4_bit+lxl_bit;
//                               LCD_ShowString(0,16,200,16,16,"total:");
//                               LCD_ShowNum(46,16,total,2,16);

                              status =PcdSelect(SN);

                              if(status==MI_OK)
                              {
                                    printf("PcdSelect_MI_OK");
                              status = PcdHalt();
                              }

                                    if(status==MI_OK)
                              {
                                    printf("PcdHalt_MI_OK");
                              }

}