Grove LoRa Radio Compile Error

Products & Technology Wio Terminal
1

I want to use the Grove LoRa Radio library using SoftwareSerial.
And I get the following error:

sketch\rf95_client.ino.cpp.o: In function `__static_initialization_and_destruction_0':
C:\Users\rr\AppData\Local\Temp\arduino_modified_sketch_514036/rf95_client.ino:18: undefined reference to `RH_RF95<SoftwareSerial>::RH_RF95(SoftwareSerial&)'
sketch\rf95_client.ino.cpp.o: In function `setup':
C:\Users\rr\AppData\Local\Temp\arduino_modified_sketch_514036/rf95_client.ino:42: undefined reference to `RH_RF95<SoftwareSerial>::init()'
C:\Users\rr\AppData\Local\Temp\arduino_modified_sketch_514036/rf95_client.ino:54: undefined reference to `RH_RF95<SoftwareSerial>::setFrequency(float)'
sketch\rf95_client.ino.cpp.o: In function `loop':
C:\Users\rr\AppData\Local\Temp\arduino_modified_sketch_514036/rf95_client.ino:61: undefined reference to `RH_RF95<SoftwareSerial>::send(unsigned char*, unsigned char)'
C:\Users\rr\AppData\Local\Temp\arduino_modified_sketch_514036/rf95_client.ino:71: undefined reference to `RH_RF95<SoftwareSerial>::recv(unsigned char*, unsigned char*)'
collect2.exe: error: ld returned 1 exit status
exit status 1
Error compiling for board Seeeduino Wio Terminal.

My code:

#include <RH_RF95.h>
#include <SoftwareSerial.h>

SoftwareSerial SSerial(0, 1); // RX, TX
#define COMSerial SSerial
#define ShowSerial Serial

RH_RF95<SoftwareSerial> rf95(COMSerial);

void setup() {
    ShowSerial.begin(115200);
    ShowSerial.println("RF95 client test.");

    if (!rf95.init()) {
        ShowSerial.println("init failed");
        while (1);
    }

    // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on

    // The default transmitter power is 13dBm, using PA_BOOST.
    // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
    // you can set transmitter powers from 5 to 23 dBm:
    //rf95.setTxPower(13, false);

    rf95.setFrequency(434.0);
}

void loop() {
    ShowSerial.println("Sending to rf95_server");
    // Send a message to rf95_server
    uint8_t data[] = "Hello World!";
    rf95.send(data, sizeof(data));

    rf95.waitPacketSent();

    // Now wait for a reply
    uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
    uint8_t len = sizeof(buf);

    if (rf95.waitAvailableTimeout(3000)) {
        // Should be a reply message for us now
        if (rf95.recv(buf, &len)) {
            ShowSerial.print("got reply: ");
            ShowSerial.println((char*)buf);
        } else {
            ShowSerial.println("recv failed");
        }
    } else {
        ShowSerial.println("No reply, is rf95_server running?");
    }

    delay(1000);
}

I also know that it is possible to use SoftwareSerial on Wio Terminal.
Is there a solution?

2

@salman
can you help him?I think this compilation should be fine.

3

Sure @Baozhu,

Hi @blizzard, I tried to compile the example code provided Grove_LoRa_433MHz_and_915MHz_RF for Wio Terminal and I didn’t found any error.

image
image482×593 22.3 KB

and In your code, you are using macros for the Arduino AVR architecture. since you are using WIO terminal which is an ARDUINO_SAMD_VARIANT you need to change the macros like

#define COMSerial Serial1
#define ShowSerial SerialUSB

RH_RF95<Uart> rf95(COMSerial);

The full edited code looks like this.

#include <RH_RF95.h>
#include <SoftwareSerial.h>

//SoftwareSerial SSerial(0, 1); // RX, TX
//#define COMSerial SSerial1
//#define ShowSerial Serial
//RH_RF95<SoftwareSerial> rf95(COMSerial);



#define COMSerial Serial1
#define ShowSerial SerialUSB

RH_RF95<Uart> rf95(COMSerial);

void setup() {
  ShowSerial.begin(115200);
  ShowSerial.println("RF95 client test.");

  if (!rf95.init()) {
    ShowSerial.println("init failed");
    while (1);
  }

  // Defaults after init are 434.0MHz, 13dBm, Bw = 125 kHz, Cr = 4/5, Sf = 128chips/symbol, CRC on

  // The default transmitter power is 13dBm, using PA_BOOST.
  // If you are using RFM95/96/97/98 modules which uses the PA_BOOST transmitter pin, then
  // you can set transmitter powers from 5 to 23 dBm:
  //rf95.setTxPower(13, false);

  rf95.setFrequency(434.0);
}

void loop() {
  ShowSerial.println("Sending to rf95_server");
  // Send a message to rf95_server
  uint8_t data[] = "Hello World!";
  rf95.send(data, sizeof(data));

  rf95.waitPacketSent();

  // Now wait for a reply
  uint8_t buf[RH_RF95_MAX_MESSAGE_LEN];
  uint8_t len = sizeof(buf);

  if (rf95.waitAvailableTimeout(3000)) {
    // Should be a reply message for us now
    if (rf95.recv(buf, &len)) {
      ShowSerial.print("got reply: ");
      ShowSerial.println((char*)buf);
    } else {
      ShowSerial.println("recv failed");
    }
  } else {
    ShowSerial.println("No reply, is rf95_server running?");
  }

  delay(1000);
}

Let me know your thought, Thanks

1 Like
4

Thanks @salman
I tested this code before. (In this example we use UART.)
But I want to use SoftwareSerial. In simpler terms, How can I use the Grove LoRa Radio library using SoftwareSerial on Wio Terminal?

PS: I also know that it is possible to use SoftwareSerial on Wio Terminal.

5

Here you can see that!

Yes, you can the software serial, share if you are facing any error!

6

Thanks, If your code is an example of SoftwareSerial, can I know where the SoftwareSerial pins are defined?

7

Hi, I want to test the same Grove LoRa Radio example, but I do not really understand all about serial communication stuff. I’m working with Arduino Mega carts, so is it really necessary that I use the Software Serial (which is used to simulate serial hardware, as I understand) since I have up to 4 serial ports in my Arduino?