247 lines
7.4 KiB
C++
247 lines
7.4 KiB
C++
/*
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COPYRIGHT NOTICE
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This work is based on the Factory_test examples, found here: https://github.com/HelTecAutomation/ASR650x-Arduino/tree/master/libraries/Basics/examples
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so the copyright for this code belongs to Heltec Automation.
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Any additional changes are free-to-use, but at your own risk.
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*/
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// CONFIGURATION of Meshtastic channel name and speed: change values in MeshRadio.h !
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#include <Arduino.h> // needed for platform.io
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#include "mesh.pb.h"
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#include "MeshRadio.h"
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#define LORA_PREAMBLE_LENGTH 32 // Same for Tx and Rx
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#define LORA_SYMBOL_TIMEOUT 0 // Symbols
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#define RX_TIMEOUT_VALUE 1000
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#define BUFFER_SIZE 0xFF // max payload (see \cores\asr650x\device\asr6501_lrwan\radio.c --> MaxPayloadLength)
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#define ID_BUFFER_SIZE 32
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char mPacket[BUFFER_SIZE];
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static RadioEvents_t RadioEvents;
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void OnTxDone( void );
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void OnTxTimeout( void );
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void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr );
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void ConfigureRadio( ChannelSettings ChanSet );
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unsigned long hash(char *str);
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ChannelSettings ChanSet;
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uint32_t receivedID[ID_BUFFER_SIZE];
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int receivedCount = -1;
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typedef enum
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{
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LOWPOWER,
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RX,
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TX
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}States_t;
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States_t state;
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int16_t rxSize;
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uint32_t x; // re-used variable of type uint32_t, used in onRxDone()
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bool found; // used in onRxDone()
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#define VERBOSE // delete or change to VERBOSE if serial output is needed
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void setup() {
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#ifndef SILENT
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Serial.begin(115200);
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Serial.println("\nSetting up Radio:");
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#endif
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RadioEvents.TxDone = OnTxDone;
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RadioEvents.TxTimeout = OnTxTimeout;
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RadioEvents.RxDone = OnRxDone;
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Radio.Init( &RadioEvents );
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ChanSet.name[12] = MESHTASTIC_NAME[12];
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ChanSet.channel_num = hash( MESHTASTIC_NAME ) % NUM_CHANNELS; // see MeshRadio.h
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ChanSet.tx_power = TX_OUTPUT_POWER;
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/* FYI:
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"bandwidth":
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[0: 125 kHz, 1: 250 kHz, 2: 500 kHz, 3: 62.5kHz, 4: 41.67kHz, 5: 31.25kHz, 6: 20.83kHz, 7: 15.63kHz, 8: 10.42kHz, 9: 7.81kHz]
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"speed":
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0: ChannelSettings_ModemConfig_Bw125Cr45Sf128 aka short range
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1: ChannelSettings_ModemConfig_Bw500Cr45Sf128 aka medium range
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2: ChannelSettings_ModemConfig_Bw31_25Cr48Sf512 aka long range
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3: ChannelSettings_ModemConfig_Bw125Cr48Sf4096 aka very long range
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"coding rate":
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[1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8]
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*/
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switch ( MESHTASTIC_SPEED ){
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case 0: { // short range
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ChanSet.bandwidth = 0; // 125 kHz
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ChanSet.coding_rate = 1; // = 4/5
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ChanSet.spread_factor = 7;
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break;
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}
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case 1: { // medium range
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ChanSet.bandwidth = 2; // 500 kHz
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ChanSet.coding_rate = 1; // = 4/5
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ChanSet.spread_factor = 7;
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break;
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}
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case 2: { // long range
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ChanSet.bandwidth = 5; // 31.25 kHz
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ChanSet.coding_rate = 4; // = 4/5
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ChanSet.spread_factor = 9;
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break;
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}
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case 3: { // very long range
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ChanSet.bandwidth = 0; // 125 kHz
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ChanSet.coding_rate = 4; // = 4/8
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ChanSet.spread_factor = 12;
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break;
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}
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default:{ // default setting is medium range
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ChanSet.bandwidth = 2; // 500 kHz
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ChanSet.coding_rate = 1; // = 4/5
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ChanSet.spread_factor = 7;
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}
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}
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ConfigureRadio( ChanSet );
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#ifndef SILENT
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Serial.println("..done!\n");
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#endif
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state=RX; // initial mode = receive
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}
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void loop()
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{
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switch(state)
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{
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case TX:
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#ifndef SILENT
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Serial.print("Sending packet..");
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Serial.printf("(Size: %i)..", rxSize);
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#endif
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Radio.Send( (uint8_t *)mPacket, rxSize );
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state=LOWPOWER;
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break;
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case RX:
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Radio.Rx( 0 ); // receive mode with no time-out
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state=LOWPOWER;
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break;
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case LOWPOWER:
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lowPowerHandler(); // put SoC to sleep, wake-up at LoRa receive
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break;
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default:
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break;
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}
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Radio.IrqProcess( );
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}
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void OnTxDone( void )
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{
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#ifndef SILENT
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Serial.println(".done!");
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#endif
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state=RX; // switch to receive mode
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}
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void OnTxTimeout( void )
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{
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#ifndef SILENT
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Serial.println(".failed! (TX Timeout)");
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#endif
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Radio.Sleep();
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state=RX; // switch to receive mode
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}
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void OnRxDone( uint8_t *payload, uint16_t size, int16_t rssi, int8_t snr )
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{
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( size > BUFFER_SIZE ) ? rxSize = BUFFER_SIZE : rxSize = size;
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memcpy( mPacket, payload, size );
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Radio.Sleep();
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uint32_t packetID = (uint32_t)mPacket[11]<<24 | (uint32_t)mPacket[10]<<16 | (uint32_t)mPacket[9]<<8 | (uint32_t)mPacket[8];
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#ifndef SILENT
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Serial.printf("\nReceived packet! (Size %i bytes, RSSI %i, SNR %i)\n", size, rssi, snr);
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Serial.print("TO: ");
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for(int i=3; i>-1; i--){
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Serial.print(mPacket[i], HEX);
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}
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Serial.print(" FROM: ");
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for(int i=7; i>3; i--){
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Serial.print(mPacket[i], HEX);
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}
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/*
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Serial.print(" PacketID: ");
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for(int i=11; i>7; i--){
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Serial.print(mPacket[i], HEX);
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}
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*/
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Serial.print(" Packet ID: ");
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Serial.println(packetID, HEX);
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Serial.print(" Flags: ");
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x = mPacket[12];
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Serial.print("WANT_ACK=");
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if (x > 8) {
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Serial.print("YES ");
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x -= 8;
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}
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else Serial.print("NO ");
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Serial.printf("HOP_LIMIT=%i", x);
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Serial.println();
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Serial.print("Payload: ");
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for(int i=13; i<size; i++){
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Serial.print(mPacket[i], HEX);
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Serial.print(" ");
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}
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Serial.println();
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#endif
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found = false;
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for(int i = 0; i < ID_BUFFER_SIZE; i++){
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if (receivedID[i] == packetID) found = true;
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}
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if (!found){
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state=TX; // will repeat package
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(receivedCount < (ID_BUFFER_SIZE - 1) ) ? receivedCount++ : receivedCount = 0; // if counter = max, overwrite first entry in list, reset counter
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receivedID[receivedCount] = x; // add ID to received list
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}
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else{
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#ifndef SILENT
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Serial.println("PacketID known, will not repeat again.");
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#endif
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state = RX; // wait for new package
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}
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}
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// hash a string into an integer - djb2 by Dan Bernstein. -
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// http://www.cse.yorku.ca/~oz/hash.html
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unsigned long hash(char *str)
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{
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unsigned long hash = 5381;
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int c;
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while ((c = *str++) != 0)
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hash = ((hash << 5) + hash) + (unsigned char) c;
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return hash;
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}
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void ConfigureRadio( ChannelSettings ChanSet )
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{
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uint32_t freq = (CH0 + CH_SPACING * ChanSet.channel_num)*1E6;
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#ifndef SILENT
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Serial.printf("\nSetting frequency to %i Hz (meshtastic channel %i) .. \n",freq,ChanSet.channel_num );
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Serial.printf("Setting bandwidth to index %i ..\n",ChanSet.bandwidth);
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Serial.printf("Setting CodeRate to index %i .. \n", ChanSet.coding_rate);
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Serial.printf("Setting SpreadingFactor to %i ..\n",ChanSet.spread_factor);
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#endif
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Radio.SetChannel( freq );
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Radio.SetTxConfig( MODEM_LORA, TX_OUTPUT_POWER, 0, ChanSet.bandwidth, ChanSet.spread_factor, ChanSet.coding_rate,
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LORA_PREAMBLE_LENGTH, false, true, false, 0, false, 20000 );
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Radio.SetRxConfig( MODEM_LORA, ChanSet.bandwidth, ChanSet.spread_factor, ChanSet.coding_rate, 0, LORA_PREAMBLE_LENGTH,
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LORA_SYMBOL_TIMEOUT, false , 0, true, false, 0, false, true );
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}
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