145 lines
3.6 KiB
C++
145 lines
3.6 KiB
C++
/*
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RadioLib Stream Receive Example
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This example shows how to receive data in "Stream" mode.
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In this mode, arbitrary length of data may be sent, up to
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"infinite" continuous transmission between two devices.
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Caveats:
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- CRC of the payload is not supported
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- the length of the payload must be known in advance
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Modules that can be used for Stream are:
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- SX127x/RFM9x (FSK mode only)
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- RF69
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- SX1231
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For default module settings, see the wiki page
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https://github.com/jgromes/RadioLib/wiki/Default-configuration#sx127xrfm9x---lora-modem
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For full API reference, see the GitHub Pages
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https://jgromes.github.io/RadioLib/
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*/
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// include the library
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#include <RadioLib.h>
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// SX1278 has the following connections:
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// NSS pin: 10
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// DIO0 pin: 2
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// RESET pin: 9
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// DIO1 pin: 3
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SX1278 radio = new Module(10, 2, 9, 3);
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// or using RadioShield
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// https://github.com/jgromes/RadioShield
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//SX1278 radio = RadioShield.ModuleA;
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void setup() {
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Serial.begin(9600);
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// initialize SX1278 with default settings
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Serial.print(F("[SX1278] Initializing ... "));
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int state = radio.beginFSK();
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// when using one of the non-LoRa modules for Stream transmit
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// (RF69, CC1101, Si4432 etc.), use the basic begin() method
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// int state = radio.begin();
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if (state == RADIOLIB_ERR_NONE) {
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Serial.println(F("success!"));
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} else {
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Serial.print(F("failed, code "));
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Serial.println(state);
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while (true);
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}
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// set the function that will be called
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// when receive buffer is full
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radio.setFifoFullAction(fifoGet);
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// fixed packet length mode is required
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radio.fixedPacketLengthMode(0);
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// start listening for packets
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Serial.print(F("[SX1278] Starting to listen ... "));
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state = radio.startReceive();
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if (state == RADIOLIB_ERR_NONE) {
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Serial.println(F("success!"));
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} else {
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Serial.print(F("failed, code "));
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Serial.println(state);
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while (true);
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}
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// if needed, 'listen' mode can be disabled by calling
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// any of the following methods:
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//
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// radio.standby()
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// radio.sleep()
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// radio.transmit();
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// radio.receive();
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// radio.readData();
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// radio.scanChannel();
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}
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// flag to indicate that a packet was received
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volatile bool receivedFlag = false;
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// disable interrupt when it's not needed
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volatile bool enableInterrupt = true;
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// how many bytes are there in total
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const int totalLength = 512;
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// counter to keep track of how many bytes have been received so far
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volatile int receivedLength = 0;
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// buffer to save the received data into
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volatile uint8_t rxBuffer[totalLength + 1];
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// this function is called when the radio receive buffer
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// is full and ready to be read
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// IMPORTANT: this function MUST be 'void' type
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// and MUST NOT have any arguments!
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#if defined(ESP8266) || defined(ESP32)
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ICACHE_RAM_ATTR
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#endif
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void fifoGet(void) {
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// check if the interrupt is enabled
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if(!enableInterrupt) {
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return;
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}
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// set the flag when we receive the full packet
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receivedFlag = radio.fifoGet(rxBuffer, totalLength, &receivedLength);
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}
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void loop() {
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// check if the flag is set
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if(receivedFlag) {
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// disable the interrupt service routine while
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// processing the data
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enableInterrupt = false;
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// packet was successfully received
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Serial.println(F("[SX1278] Received packet!"));
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// print data of the packet
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Serial.print(F("[SX1278] Data:\t\t"));
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Serial.println((char*)rxBuffer);
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// reset flag
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receivedFlag = false;
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receivedLength = 0;
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// put module back to listen mode
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radio.startReceive();
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// we're ready to receive more packets,
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// enable interrupt service routine
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enableInterrupt = true;
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}
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}
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