98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
/*
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RadioLib SX127x Receive Example
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This example listens for LoRa transmissions using SX127x Lora modules.
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To successfully receive data, the following settings have to be the same
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on both transmitter and receiver:
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- carrier frequency
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- bandwidth
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- spreading factor
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- coding rate
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- sync word
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- preamble length
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Other modules from SX127x/RFM9x family can also be used.
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*/
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// include the library
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#include <RadioLib.h>
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// SX1278 module is in slot A on the shield
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SX1278 lora = 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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// carrier frequency: 434.0 MHz
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// bandwidth: 125.0 kHz
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// spreading factor: 9
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// coding rate: 7
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// sync word: 0x12
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// output power: 17 dBm
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// current limit: 100 mA
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// preamble length: 8 symbols
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// amplifier gain: 0 (automatic gain control)
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int state = lora.begin();
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if (state == 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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}
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void loop() {
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Serial.print(F("[SX1278] Waiting for incoming transmission ... "));
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// you can receive data as an Arduino String
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// NOTE: receive() is a blocking method!
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// See example ReceiveInterrupt for details
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// on non-blocking reception method.
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String str;
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int state = lora.receive(str);
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// you can also receive data as byte array
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/*
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byte byteArr[8];
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int state = lora.receive(byteArr, 8);
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*/
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if (state == ERR_NONE) {
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// packet was successfully received
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Serial.println(F("success!"));
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// print the data of the packet
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Serial.print(F("[SX1278] Data:\t\t"));
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Serial.println(str);
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// print the RSSI (Received Signal Strength Indicator)
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// of the last received packet
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Serial.print(F("[SX1278] RSSI:\t\t"));
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Serial.print(lora.getRSSI());
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Serial.println(F(" dBm"));
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// print the SNR (Signal-to-Noise Ratio)
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// of the last received packet
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Serial.print(F("[SX1278] SNR:\t\t"));
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Serial.print(lora.getSNR());
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Serial.println(F(" dBm"));
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// print frequency error
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// of the last received packet
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Serial.print(F("Frequency error:\t"));
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Serial.print(lora.getFrequencyError());
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Serial.println(F(" Hz"));
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} else if (state == ERR_RX_TIMEOUT) {
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// timeout occurred while waiting for a packet
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Serial.println(F("timeout!"));
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} else if (state == ERR_CRC_MISMATCH) {
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// packet was received, but is malformed
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Serial.println(F("CRC error!"));
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}
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}
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