通用遥控编码2262与1527解说

通用遥控主频常为433MHz与315MHz

编码为NRZ格式

数据形式通常以1527与2262为居多;

传输数率: 1Kb/s左右

宽占空比约:1000us,窄占空比约:300us

 1 以下是1527数据形式:
 2 
 3 D55Dxx
 4 
 5 键1:1101 0101 0101 1101 0000 0001
 6 
 7 键2:1101 0101 0101 1101 0000 0010
 8 键3:1101 0101 0101 1101 0000 0100
 9 键4:1101 0101 0101 1101 0000 1000
10 ...
11 
12 最大为16个键值,即最后4bit为键值,1-4键为基础键值,其他都为ID值。
13 
14 以下是2262数据形式:
15 
16 D55Dxx
17 
18 键1:1101 0101 0101 1101 0000 0011
19 
20 键2:1101 0101 0101 1101 0000 1100
21 
22 键3:1101 0101 0101 1101 0011 0000
23 
24 键4:1101 0101 0101 1101 1100 0000
25 
26 ...
27 
28 最大为16个键值,即最后8bit为键值,1-4键为基础键值,其他都为ID值。

这种键值是没有加密的,传送的都是明文,所以保密性不高,通常用于遥控开关,家具等。当用到安全比较高的场合,这种编码就不可靠了。往往针对这些,我们需要用到其他编码以及数据组合形式。例如曼切斯特编码,has,xxtea,aes等加密方式进行通信。

 

 1 /*---------------------------------------------------------
 2 **        RF Data Format:    NRZ decoder
 3 **        1B = 1000usH+300usL; 0B = 300usH+1000usL; T = 1300us
 4 **        Package interval=10msL
 5 **        ASM Modulation
 6 **            Designed by Milo lu
 7 -----------------------------------------------------------*/
 8 void Intp5_IQR_callback_Handle(void)
 9 {
10     static uint8_t bits_of_byte;
11     static uint32_t one_byte,last_id;
12     uint8_t IO_State;
13     IO_State = PORT_GetBit(ASK_INPUT_PORT,ASK_INPUT_PIN);
14     
15     if(IO_State !=0 )                // Low to high transition
16     {
17         // Low state time is Longer than 1.7ms,OR Paraser busy, data crash, retry again
18         if((TAR_50us >= 34)||(DATA_RECEIVED.long_value!=0) || (RF_Delay!=0) || (g_bool_battery_unplug==true))
19         {
20             START_RX = 0;
21         }
22         TAR_50us = 0;
23     }
24     else                            // High to low transition
25     {
26         if(!START_RX)                                         // The first header doesn't receive
27         {
28             if((TAR_50us > 14)&&(TAR_50us < 34))             // 1.7ms > T > 0.7ms
29             {
30                 one_byte = 1;
31                 bits_of_byte = 1;
32                 START_RX = 1;
33             }
34             else if((TAR_50us >4)&&(TAR_50us< 12))            //0 600us > T > 200us
35             {
36                 one_byte = 0;
37                 bits_of_byte = 1;
38                 START_RX = 1;
39             }
40         }
41         else                                                  // The second header received,
42         {                                                   // start to get RF data
43             if((TAR_50us >4)&&(TAR_50us< 12))                //0 600us > T > 200us
44             {
45                 one_byte <<=1;
46                 bits_of_byte++;
47             }
48             else if((TAR_50us > 14)&&(TAR_50us < 34))         // 1.7ms > T > 0.7ms
49             {
50                 one_byte<<=1;
51                 one_byte+=1;
52                 bits_of_byte++;
53             }
54             else
55             {
56                 START_RX = 0x00;                            // data crash, retry again
57             }
58             if(bits_of_byte >= 24)                             // got one byte, got id
59             {
60                 if((last_id != one_byte)&&(f0LearnMode & flag.flag0))
61                 {
62                     last_id = one_byte;
63                 }
64                 else                                        //at least 2 times get the same id
65                 {
66                     DATA_RECEIVED.long_value = one_byte;    //load RF data
67                 }
68                 #if ask_debug
69                 printf("DATA_RECEIVED.long_value=%04x\n",DATA_RECEIVED.long_value);
70                 #endif
71                 START_RX = 0x00;                            // Receiving repeat
72                 one_byte = 0;
73                 bits_of_byte = 0;
74             }
75         }
76         TAR_50us = 0;
77     }
78 }
79 
80 
81 /*====================================
82 function name: timerA_callback_handle
83 discription: about 50us increase
84 parameters: none
85 return: none
86 ======================================*/
87 void timerA_callback_handle(void)
88 {
89     TAR_50us++;
90 }
91 //-------------------- end of file ---------------------
View Code

 

posted on 2021-01-26 12:00  Milo_lu  阅读(5698)  评论(0编辑  收藏  举报

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