├── LICENSE ├── README.md └── lora_arduino_kiss_modem.ino /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. By contrast, the GNU General Public 13 | License is intended to guarantee your freedom to share and change free 14 | software--to make sure the software is free for all its users. This 15 | General Public License applies to most of the Free Software 16 | Foundation's software and to any other program whose authors commit to 17 | using it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Arduino LoRa TNC KISS modem 2 | Single sketch minimalistic Arduino LoRa USB serial KISS modem for APRS or AX25 packet networks. 3 | 4 | To be used with APRSDroid using USB OTG or Linux APRS/AX.25 tools on PC or Raspberry. 5 | 6 | Similar modem, but based on 2.4 GHz NRF24L01: https://github.com/sh123/nrf24l01_arduino_kiss_modem 7 | -------------------------------------------------------------------------------- /lora_arduino_kiss_modem.ino: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | enum KissMarker { 5 | Fend = 0xc0, 6 | Fesc = 0xdb, 7 | Tfend = 0xdc, 8 | Tfesc = 0xdd 9 | }; 10 | 11 | enum KissState { 12 | Void = 0, 13 | GetCmd, 14 | GetData, 15 | GetP, 16 | GetSlotTime, 17 | Escape 18 | }; 19 | 20 | enum KissCmd { 21 | Data = 0x00, 22 | P = 0x02, 23 | SlotTime = 0x03, 24 | NoCmd = 0x80 25 | }; 26 | 27 | #define DEFAULT_P 128 28 | #define DEFAULT_SLOT_TIME 500 29 | 30 | #define CFG_LORA_PIN_SS 5 31 | #define CFG_LORA_PIN_RST 26 32 | #define CFG_LORA_PIN_DIO0 14 33 | 34 | #define CFG_LORA_FREQ 433.775E6 35 | #define CFG_LORA_SYNC_WORD 0x34 36 | #define CFG_LORA_BW 125e3 37 | #define CFG_LORA_SF 12 38 | #define CFG_LORA_CR 7 39 | #define CFG_LORA_PWR 20 40 | #define CFG_LORA_ENABLE_CRC true 41 | 42 | #define CONN_RETRY_SLEEP_MS 1000 43 | #define LOOP_SLEEP_MS 10 44 | 45 | KissState kissState_; 46 | KissCmd kissCmd_; 47 | 48 | byte csmaP_ = DEFAULT_P; 49 | long csmaSlotTime_ = DEFAULT_SLOT_TIME; 50 | long csmaSlotTimePrev_ = 0; 51 | 52 | void setup() { 53 | Serial.begin(115200); 54 | while (!Serial); 55 | 56 | LoRa.setPins(CFG_LORA_PIN_SS, CFG_LORA_PIN_RST, CFG_LORA_PIN_DIO0); 57 | 58 | while (!LoRa.begin(CFG_LORA_FREQ)) { 59 | delay(CONN_RETRY_SLEEP_MS); 60 | } 61 | LoRa.setSyncWord(CFG_LORA_SYNC_WORD); 62 | LoRa.setSpreadingFactor(CFG_LORA_SF); 63 | LoRa.setSignalBandwidth(CFG_LORA_BW); 64 | LoRa.setCodingRate4(CFG_LORA_CR); 65 | LoRa.setTxPower(CFG_LORA_ENABLE_CRC); 66 | if (CFG_LORA_ENABLE_CRC) { 67 | LoRa.enableCrc(); 68 | } 69 | } 70 | 71 | void loop() { 72 | if (LoRa.parsePacket() > 0) { 73 | onRadioDataAvailable(); 74 | } 75 | else { 76 | long currentTime = millis(); 77 | if (currentTime > csmaSlotTimePrev_ + csmaSlotTime_ && random(0, 255) < csmaP_) { 78 | if (Serial.available()) { 79 | onSerialDataAvailable(); 80 | } 81 | csmaSlotTimePrev_ = currentTime; 82 | } 83 | } 84 | delay(LOOP_SLEEP_MS); 85 | } 86 | 87 | void kissResetState() 88 | { 89 | kissCmd_ = KissCmd::NoCmd; 90 | kissState_ = KissState::Void; 91 | } 92 | 93 | void onRadioDataAvailable() 94 | { 95 | Serial.write(KissMarker::Fend); 96 | Serial.write(KissCmd::Data); 97 | 98 | while (LoRa.available()) { 99 | byte rxByte = LoRa.read(); 100 | 101 | if (rxByte == KissMarker::Fend) { 102 | Serial.write(KissMarker::Fesc); 103 | Serial.write(KissMarker::Tfend); 104 | } 105 | else if (rxByte == KissMarker::Fesc) { 106 | Serial.write(KissMarker::Fesc); 107 | Serial.write(KissMarker::Tfesc); 108 | } 109 | else { 110 | Serial.write(rxByte); 111 | } 112 | } 113 | Serial.write(KissMarker::Fend); 114 | } 115 | 116 | void onSerialDataAvailable() 117 | { 118 | while (Serial.available()) { 119 | 120 | int rxResult = Serial.read(); 121 | if (rxResult == -1) break; 122 | 123 | byte rxByte = (byte)rxResult; 124 | 125 | switch (kissState_) { 126 | case KissState::Void: 127 | if (rxByte == KissMarker::Fend) { 128 | kissCmd_ = KissCmd::NoCmd; 129 | kissState_ = KissState::GetCmd; 130 | } 131 | break; 132 | case KissState::GetCmd: 133 | if (rxByte != KissMarker::Fend) { 134 | if (rxByte == KissCmd::Data) { 135 | LoRa.beginPacket(); 136 | kissCmd_ = (KissCmd)rxByte; 137 | kissState_ = KissState::GetData; 138 | } 139 | else if (rxByte == KissCmd::P) { 140 | kissCmd_ = (KissCmd)rxByte; 141 | kissState_ = KissState::GetP; 142 | } 143 | else if (rxByte == KissCmd::SlotTime) { 144 | kissCmd_ = (KissCmd)rxByte; 145 | kissState_ = KissState::GetSlotTime; 146 | } 147 | else { 148 | kissResetState(); 149 | } 150 | } 151 | break; 152 | case KissState::GetP: 153 | csmaP_ = rxByte; 154 | kissState_ = KissState::GetData; 155 | break; 156 | case KissState::GetSlotTime: 157 | csmaSlotTime_ = (long)rxByte * 10; 158 | kissState_ = KissState::GetData; 159 | break; 160 | case KissState::GetData: 161 | if (rxByte == KissMarker::Fesc) { 162 | kissState_ = KissState::Escape; 163 | } 164 | else if (rxByte == KissMarker::Fend) { 165 | if (kissCmd_ == KissCmd::Data) { 166 | LoRa.endPacket(); 167 | } 168 | kissResetState(); 169 | } 170 | else if (kissCmd_ == KissCmd::Data) { 171 | LoRa.write(rxByte); 172 | } 173 | break; 174 | case KissState::Escape: 175 | if (rxByte == KissMarker::Tfend) { 176 | LoRa.write(KissMarker::Fend); 177 | kissState_ = KissState::GetData; 178 | } 179 | else if (rxByte == KissMarker::Tfesc) { 180 | LoRa.write(KissMarker::Fesc); 181 | kissState_ = KissState::GetData; 182 | } 183 | else { 184 | kissResetState(); 185 | } 186 | break; 187 | default: 188 | break; 189 | } 190 | } 191 | } 192 | --------------------------------------------------------------------------------