Wiki source code of Point to Point Communication of LT-22222-L
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| author | version | line-number | content |
|---|---|---|---|
| 1 | {{box cssClass="floatinginfobox" title="**Contents**"}} | ||
| 2 | {{toc/}} | ||
| 3 | {{/box}} | ||
| 4 | |||
| 5 | = **1. Overview** = | ||
| 6 | |||
| 7 | ((( | ||
| 8 | Shipped LT-22222-L is base on LoRaWAN protocol. We also develop a open source Point to Point LoRa protocol for LT-22222-L. The source code and hex file can be found at: | ||
| 9 | ))) | ||
| 10 | |||
| 11 | ((( | ||
| 12 | [[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]]. | ||
| 13 | ))) | ||
| 14 | |||
| 15 | == == | ||
| 16 | |||
| 17 | = **2. Features for this firmware** = | ||
| 18 | |||
| 19 | |||
| 20 | == **2.1 Point To Point** == | ||
| 21 | |||
| 22 | |||
| 23 | [[image:image-20220602111219-1.png||height="472" width="972"]] | ||
| 24 | |||
| 25 | |||
| 26 | (% class="wikigeneratedid" id="H2.2.Configure" %) | ||
| 27 | (% style="color:blue" %)**Configure:** | ||
| 28 | |||
| 29 | (% border="1" style="background-color:#f7faff; color:black; width:500px" %) | ||
| 30 | |=**A's configuration**|=**B's configuration** | ||
| 31 | |AT+GROUPMOD=0|AT+GROUPMOD=0 | ||
| 32 | |AT+TXCHS=868700000|AT+TXCHS=869000000 | ||
| 33 | |AT+RXCHS=869000000|AT+RXCHS=868700000 | ||
| 34 | |AT+TRIG1=2,50|AT+TRIG1=2,50 | ||
| 35 | |AT+TRIG2=2,50|AT+TRIG2=2,50 | ||
| 36 | |AT+DI1TODO1=2|AT+DI1TODO1=2 | ||
| 37 | |AT+DI1TORO1=2|AT+DI1TORO1=2 | ||
| 38 | |AT+DI2TODO2=2 |AT+DI2TODO2=2 | ||
| 39 | |AT+DI2TORO2=2|AT+DI2TORO2=2 | ||
| 40 | |||
| 41 | == **2.2 Point To Mult-Point ** == | ||
| 42 | |||
| 43 | |||
| 44 | [[image:image-20220602111219-2.png]] | ||
| 45 | |||
| 46 | |||
| 47 | [[image:image-20220602111219-3.png]] | ||
| 48 | |||
| 49 | ((( | ||
| 50 | If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 6 seconds, and the UplinkCounter of the retransmission will not increase. | ||
| 51 | ))) | ||
| 52 | |||
| 53 | |||
| 54 | == **2.3 AT command** == | ||
| 55 | |||
| 56 | |||
| 57 | (% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU | ||
| 58 | |||
| 59 | (% style="color:#037691" %)**AT+FDR** (%%)**:** Reset Parameters to Factory Default, Keys Reserve | ||
| 60 | |||
| 61 | (% style="color:#037691" %)**AT+FCU** (%%)**:** Get or Set the Frame Counter Uplink | ||
| 62 | |||
| 63 | (% style="color:#037691" %)**AT+FCD** (%%)**:** Get or Set the Frame Counter Downlink | ||
| 64 | |||
| 65 | (% style="color:#037691" %)**AT+TXP** (%%)**:** Get or Set the transmit power, the maximum is 20dBm (default is 14dBm) | ||
| 66 | |||
| 67 | (% style="color:#037691" %)**AT+SYNC** (%%)**:** Get or Set the Sync word [1:0x34,0:0x12] (default is 1) | ||
| 68 | |||
| 69 | (% style="color:#037691" %)**AT+PMB** (%%)**: **Get or Set the preamble (default:8) | ||
| 70 | |||
| 71 | (% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000) | ||
| 72 | |||
| 73 | (% style="color:#037691" %)**AT+TXSF **(%%)**:** Get or Set the spreading factor of TX (7 to 12) (default:12) | ||
| 74 | |||
| 75 | (% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000) | ||
| 76 | |||
| 77 | (% style="color:#037691" %)**AT+RXSF **(%%)**:** Get or Set the spreading factor of RX (7 to 12) (default:12) | ||
| 78 | |||
| 79 | (% style="color:#037691" %)**AT+BW **(%%)**: **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0) | ||
| 80 | |||
| 81 | (% style="color:#037691" %)**AT+CR **(%%)**: **Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1) | ||
| 82 | |||
| 83 | (% style="color:#037691" %)**AT+TDC **(%%)**:** Get or set the application data transmission interval in ms(default 10 minutes) | ||
| 84 | |||
| 85 | (% style="color:#037691" %)**AT+VER **(%%)**:** Get firmware version number | ||
| 86 | |||
| 87 | (% style="color:#037691" %)**AT+SEND **(%%)**: **Set Custom sent hex data | ||
| 88 | |||
| 89 | (% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0) | ||
| 90 | |||
| 91 | ((( | ||
| 92 | (% style="color:#037691" %)**AT+GROUPID **(%%)**: **Set or Get the password for matching between TX group and RX group, which can be composed of numbers or characters (default: 12345678) | ||
| 93 | ))) | ||
| 94 | |||
| 95 | (% style="color:#037691" %)**AT+TRIG1 **(%%)**:** Set or Get the DI1 pin interrupt trigger mode (default 0,0) | ||
| 96 | |||
| 97 | (% style="color:#037691" %)**AT+TRIG2 **(%%)**: **Set or Get the DI2 pin interrupt trigger mode (default 0,0) | ||
| 98 | |||
| 99 | (% style="color:#037691" %)**AT+DI1TODO1 **(%%)**: **Set or get the mode in which DI1 maps to DO1 (default 0) | ||
| 100 | |||
| 101 | (% style="color:#037691" %)**AT+DI1TORO1 **(%%)**: **Set or get the mode in which DI1 maps to RO1(default 0) | ||
| 102 | |||
| 103 | (% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:** Set or get the mode in which DI2 maps to DO2(default 0) | ||
| 104 | |||
| 105 | (% style="color:#037691" %)**AT+DI2TORO2 **(%%)**: **Set or get the mode in which DI2 maps to RO2(default 0) | ||
| 106 | |||
| 107 | |||
| 108 | |||
| 109 | (% style="color:#4f81bd" %)**Example 1:** | ||
| 110 | |||
| 111 | **AT+SEND=01020304 **will send a payload of 01020304 | ||
| 112 | |||
| 113 | |||
| 114 | (% style="color:#4f81bd" %)**Example 2: ** | ||
| 115 | |||
| 116 | **AT+TRIGx=a **Trigger directly without triggering time | ||
| 117 | |||
| 118 | **AT+TRIGx=a,b** | ||
| 119 | |||
| 120 | a=0: falling edge; | ||
| 121 | |||
| 122 | a=1: rising edge; | ||
| 123 | |||
| 124 | a=2: falling edge or rising edge; | ||
| 125 | |||
| 126 | b: triggering time in milliseconds. | ||
| 127 | |||
| 128 | AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms. | ||
| 129 | |||
| 130 | |||
| 131 | (% style="color:#4f81bd" %)**Example 3: ** | ||
| 132 | |||
| 133 | **AT+DI1TODO1= maps value** | ||
| 134 | |||
| 135 | **AT+DI1TORO1= maps value** | ||
| 136 | |||
| 137 | **AT+DI2TODO2= maps value** | ||
| 138 | |||
| 139 | **AT+DI2TORO2= maps value** | ||
| 140 | |||
| 141 | |||
| 142 | (% border="1" style="background-color:#f7faff; color:black; width:706px" %) | ||
| 143 | |=(% style="width: 102px;" %)Maps value|=(% style="width: 331px;" %)DIx to DOx|=(% style="width: 268px;" %)DIx to ROx | ||
| 144 | |(% style="width:102px" %)0|(% style="width:331px" %)No Action|(% style="width:268px" %)No Action | ||
| 145 | |(% style="width:102px" %)1|(% style="width:331px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|(% style="width:268px" %)((( | ||
| 146 | If DIx is high, control ROx to close, | ||
| 147 | |||
| 148 | if DIx is low, control ROx to open | ||
| 149 | ))) | ||
| 150 | |(% style="width:102px" %)2|(% style="width:331px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|(% style="width:268px" %)((( | ||
| 151 | If DIx is high, control ROx to open, | ||
| 152 | |||
| 153 | if DIx is low, control ROx to close | ||
| 154 | ))) | ||
| 155 | |(% style="width:102px" %)3|(% style="width:331px" %)DOx state flip|(% style="width:268px" %)ROx state flip | ||
| 156 | |||
| 157 | (% style="color:#4f81bd" %)**Example 4: ** | ||
| 158 | |||
| 159 | **AT+GROUPMOD=0** Set to point to point mode | ||
| 160 | |||
| 161 | **AT+GROUPMOD=0,aa** Set the TX group that controls the number of aa (The maximum value of aa is 8) | ||
| 162 | |||
| 163 | ((( | ||
| 164 | **AT+GROUPMOD=1,bb** Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8) | ||
| 165 | ))) | ||
| 166 | |||
| 167 | **AT+GROUPMOD=0,2** Set to control the TX group of the two RX groups | ||
| 168 | |||
| 169 | **AT+GROUPMOD=1,1** Set the RX group numbered 1 | ||
| 170 | |||
| 171 | **AT+GROUPMOD=1,2** Set the RX group numbered 2 | ||
| 172 | |||
| 173 | |||
| 174 | == **2.4 Data Format** == | ||
| 175 | |||
| 176 | 8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum | ||
| 177 | |||
| 178 | |||
| 179 | (% style="color:#4f81bd" %)**Payload:** | ||
| 180 | |||
| 181 | (% border="1" style="background-color:#f7faff; color:black; width:938px" %) | ||
| 182 | |=(% style="width: 123px;" %)**Size (bytes)**|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1 | ||
| 183 | |(% style="width:123px" %)**Value**|(% style="width:38px" %)address|(% style="width:70px" %)request|(% style="width:52px" %)ACK|(% style="width:127px" %)((( | ||
| 184 | DI1& | ||
| 185 | |||
| 186 | DI1 level | ||
| 187 | )))|(% style="width:101px" %)DI1TODO1|(% style="width:91px" %)DI1TORO1|(% style="width:111px" %)((( | ||
| 188 | DI2& | ||
| 189 | |||
| 190 | DI2 level | ||
| 191 | )))|(% style="width:105px" %)DI2TODO2|(% style="width:106px" %)DI2TORO2 | ||
| 192 | |||
| 193 | (% style="color:#037691" %)**The first byte**(%%)**:** 00 is the broadcast address, 01-08 is the RX group number. | ||
| 194 | |||
| 195 | (% style="color:#037691" %)**The second byte**(%%)**:** send mapping request when not 0, not request when it is 0. | ||
| 196 | |||
| 197 | (% style="color:#037691" %)**The third byte**(%%)**:** ACK returned to the sender after the mapping is completed. | ||
| 198 | |||
| 199 | ((( | ||
| 200 | (% style="color:#037691" %)**The fourth byte**(%%)**:** the high four bits are 1 to represent DI1, and the low four bits are the level of DI1 when the interrupt is triggered. | ||
| 201 | ))) | ||
| 202 | |||
| 203 | (% style="color:#037691" %)**The Fifth byte**(%%)**: **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered. | ||
| 204 | |||
| 205 | (% style="color:#037691" %)**The Sixth byte**(%%)**:** 0 does not trigger interrupt when DI1TORO1 interrupt is triggered. | ||
| 206 | |||
| 207 | ((( | ||
| 208 | (% style="color:#037691" %)**The seventh byte**(%%)**:** the high four bits are 2 to represent DI2, and the low four bits are the level of DI2 when the interrupt is triggered. | ||
| 209 | ))) | ||
| 210 | |||
| 211 | (% style="color:#037691" %)**The 8th byte**(%%)**: **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered. | ||
| 212 | |||
| 213 | (% style="color:#037691" %)**The 9th byte**(%%)**:** DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered. | ||
| 214 | |||
| 215 |