Closed ghost closed 3 years ago
Sometimes, the packet is corrupted and the length may not fit.
CS is actually SS/NSS. Try to change to SS to pin 53. I believe the pins for SPI in Arduino may be fixed.
NSS is pin 53 on the small picture
Thanks for your answer IoTThinks, I have done that :) Well, now It's work for a moment.. and maybe after 5mn It doesn't work anymore.... very strange
Try this example instead. https://github.com/sandeepmistry/arduino-LoRa/blob/master/examples/LoRaDuplexCallback/LoRaDuplexCallback.ino
Check how they use LoRa.onReceive(onReceive) and LoRa.receive() in setup()
Your code below doesn't look right to me. parsePacket() is for single receive mode. and onReceive is for continuous mode.
// parse for a packet, and call onReceive with the result:
onReceive(LoRa.parsePacket());
=> "message length does not match length" is understandable now. As parsePacket() will return 0 if no packet is received and onReceive is only called when a packet is received.
I tried your example, it receive one message from the other but after sending his first message, it doesn't receive anything anymore.
If I comment the line of sendMessage in the loop, It receive all the messages from the other...
/*
LoRa Duplex communication wth callback
Sends a message every half second, and uses callback
for new incoming messages. Implements a one-byte addressing scheme,
with 0xFF as the broadcast address.
Note: while sending, LoRa radio is not listening for incoming messages.
Note2: when using the callback method, you can't use any of the Stream
functions that rely on the timeout, such as readString, parseInt(), etc.
created 28 April 2017
by Tom Igoe
*/
#include <SPI.h> // include libraries
#include <LoRa.h>
#ifdef ARDUINO_SAMD_MKRWAN1300
#error "This example is not compatible with the Arduino MKR WAN 1300 board!"
#endif
const int csPin = 53; // LoRa radio chip select
const int resetPin = 9; // LoRa radio reset
const int irqPin = 2; // change for your board; must be a hardware interrupt pin
String outgoing; // outgoing message
byte msgCount = 0; // count of outgoing messages
byte localAddress = 0xBA; // address of this device
byte destination = 0xFF; // destination to send to
long lastSendTime = 0; // last send time
int interval = 2000; // interval between sends
void setup() {
Serial.begin(9600); // initialize serial
while (!Serial);
Serial.println("LoRa Duplex with callback");
// override the default CS, reset, and IRQ pins (optional)
LoRa.setPins(csPin, resetPin, irqPin);// set CS, reset, IRQ pin
if (!LoRa.begin(433E6)) { // initialize ratio at 915 MHz
Serial.println("LoRa init failed. Check your connections.");
while (true); // if failed, do nothing
}
LoRa.onReceive(onReceive);
LoRa.receive();
Serial.println("LoRa init succeeded.");
}
void loop() {
if (millis() - lastSendTime > interval) {
String message = "HeLoRa World from ba"; // send a message
sendMessage(message);
Serial.println("Sending " + message);
lastSendTime = millis(); // timestamp the message
interval = random(10000) + 1000; // 2-3 seconds
LoRa.receive(); // go back into receive mode
}
}
void sendMessage(String outgoing) {
LoRa.beginPacket(); // start packet
LoRa.write(destination); // add destination address
LoRa.write(localAddress); // add sender address
LoRa.write(msgCount); // add message ID
LoRa.write(outgoing.length()); // add payload length
LoRa.print(outgoing); // add payload
LoRa.endPacket(); // finish packet and send it
msgCount++; // increment message ID
}
void onReceive(int packetSize) {
if (packetSize == 0){
Serial.println("Receive packet who size == 0");
return; // if there's no packet, return
}
// read packet header bytes:
int recipient = LoRa.read(); // recipient address
byte sender = LoRa.read(); // sender address
byte incomingMsgId = LoRa.read(); // incoming msg ID
byte incomingLength = LoRa.read(); // incoming msg length
String incoming = ""; // payload of packet
while (LoRa.available()) { // can't use readString() in callback, so
incoming += (char)LoRa.read(); // add bytes one by one
}
if (incomingLength != incoming.length()) { // check length for error
Serial.println("error: message length does not match length");
return; // skip rest of function
}
// if the recipient isn't this device or broadcast,
if (recipient != localAddress && recipient != 0xFF) {
Serial.println("This message is not for me.");
return; // skip rest of function
}
// if message is for this device, or broadcast, print details:
Serial.println("Received from: 0x" + String(sender, HEX));
Serial.println("Sent to: 0x" + String(recipient, HEX));
Serial.println("Message ID: " + String(incomingMsgId));
Serial.println("Message length: " + String(incomingLength));
Serial.println("Message: " + incoming);
Serial.println("RSSI: " + String(LoRa.packetRssi()));
Serial.println("Snr: " + String(LoRa.packetSnr()));
Serial.println();
}
If I put this on the both arduino
if (!LoRa.begin(433E6)) { // initialize ratio at 915 MHz
Serial.println("LoRa init failed. Check your connections.");
while (true); // if failed, do nothing
}
LoRa.onReceive(onReceive);
LoRa.receive();
just after sendMessage, one arduine receive correctly all but not the other one... strange
@TrankilEmil098 if you're using version 0.7.1 please upgrade, we just discovered a bug that could be causing receive to only work once.
I have buy a new module and now that's work ! He was broken. Thanks again guys for you answer!
I made Mega + sx1278 works at https://github.com/sandeepmistry/arduino-LoRa/issues/205#issuecomment-613848638
Atention: !LoRa.begin(433E6)) ==> 433 MHz !!!!!!!!!!!!!
Attention: LoRa.begin(433E6)) ==> 433 MHz !!!!!!!!!!!!!
Well quite obviously: 443e6 is shorthand for 433000000, ie 433 million. Hence 433 MHz///
I have an error when I try to communicate two modules "error: message length does not match length"
Hello, I have two arduino mega 2560 connected at two Ra-02 sx1278 like this:
LORA------------MEGA 3,3--------------3,3 GND-------------GND MOSI------------51 SCK-------------52 MISO-----------50 NSS-------------10 RESET-----------9 DIO0-------------2
and my code is :
For the 2nd one, I change the adress for OxBB.
The connetion work one time before write "error: message length does not match length". Somebody can help me ? Thanks