Interfacing ESP32 Wrover and RA-02 (SX1278)

Projects Programming
1

Hello guys,
I think I stuck at a very simple "C" logic but cannot find the answer, can you help please?
I built a simple circuit with ESP32 Wrover and Ai-Thinker RA-02(sx1278) LoRa Module and trying to interface them.
My connections are;
ESPIO5 --> LoRaSS
ESPIO18 --> LoRaSCK
ESPIO19 --> LoRaMISO
ESPIO21 --> LoRaIO0
ESPIO22 --> LoRaRST
ESPIO23 --> LoRaMOSI
ESP32 EN and IO0 are connected button circuits for reset and programming, ESP and LoRa PWR connections are decoulped and seems fine on oscillator.

I'm using default LoRa library and Since I'm using Wrover module, I'm using "SPIClass * classname" to change SPI pins but since "LoRa.setSPI(SPIClass& classname)" function expects an address, I cannot use SPIClass pointer in this function and getting errors. Can you take a look at my code please?

#include <SPI.h>
#include <LoRa.h>

int counter = 0;

#define rst 22
#define dio0 21

#define VSPI_MISO   19
#define VSPI_MOSI   23
#define VSPI_SCLK   18
#define VSPI_SS     5

SPIClass * vspi = NULL;


void setup() {
  Serial.begin(115200);
  while (!Serial);

  Serial.println("LoRa Sender");
  vspi = new SPIClass(VSPI);
  vspi->begin(VSPI_SCLK, VSPI_MISO, VSPI_MOSI, VSPI_SS);          // Start SPI
  LoRa.setSPI(vspi);
  LoRa.setPins(VSPI_SS, rst, dio0);
  if (!LoRa.begin(433E6)) {
    Serial.println("Starting LoRa failed!");
    delay (2000);
    ESP.restart();
  }
  
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);

  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();

  counter++;

  delay(1000);
}

If I compile like this, I get the compiling error "invalid user-defined conversion from 'SPIClass*' to 'SPIClass&' [-fpermissive]"
And if I comment out the setSPI method then I stuck at "Starting LoRa failed!"
Thanks for helps

2

Why bother ?

With SCK, MOSI and MISO on the pins shown, just use SPI.begin();, no parameters needed, your using the default pins for the SPI instance.

3

You are soo right about it, I used to use different pins and I completely forgot that these are the default pins. :sweat:
And I figure out that my real problem was a discontinuation on data lines, a simple solder job and all done.
Thanks again and sorry for this unnecessary topic XD

4

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.