problem in nitialization of Lora sx1278 on custom pins on official stm32core

[anandspathak]

Dear Sir,
have been using Lora sx1278 with esp32 with no issues,
Now have shifted to STM32 official core with following pin mapping and i couldnt initialize lora with below settings,
------- SPI2 Pins----
MISO---PB6,
MOSI---PB7
SCLK---PB8
SS---PB9

and constructor for lora is below:
NSS DIO0 RESET DIO1
SX1278 radio = new Module(PB9, PB3, PA15, PB4);

error : [SX1278] Initializing ... failed, code -2

below is my code:

// include the library
#include <SPI.h>
#include <RadioLib.h>
           // MOSI  MISO  SCLK   SSEL
SPIClass SPI_2(PB7, PB6, PB8, PB9);

// SX1278 has the following connections:
// NSS pin:   10
// DIO0 pin:  2
// RESET pin: 9
// DIO1 pin:  3
SX1278 radio = new Module(PB9, PB3, PA15, PB4);

// or using RadioShield
// https://github.com/jgromes/RadioShield
//SX1278 radio = RadioShield.ModuleA;

// save transmission state between loops
int transmissionState = RADIOLIB_ERR_NONE;

HardwareSerial Serial1(PA10, PA9);

void setup() {
  Serial1.begin(9600);
  SPI_2.begin();

  // initialize SX1278 with default settings
  Serial1.print(F("[SX1278] Initializing ... "));
  int state = radio.begin();
  if (state == RADIOLIB_ERR_NONE) {
    Serial1.println(F("success!"));
  } else {
    Serial1.print(F("failed, code "));
    Serial1.println(state);
    while (true);
  }

  // set the function that will be called
  // when packet transmission is finished
  radio.setPacketSentAction(setFlag);

  // start transmitting the first packet
  Serial1.print(F("[SX1278] Sending first packet ... "));

  // you can transmit C-string or Arduino string up to
  // 255 characters long
  transmissionState = radio.startTransmit("Hello World!");

  // you can also transmit byte array up to 255 bytes long
  /*
    byte byteArr[] = {0x01, 0x23, 0x45, 0x67,
                      0x89, 0xAB, 0xCD, 0xEF};
    transmissionState = radio.startTransmit(byteArr, 8);
  */
}

// flag to indicate that a packet was sent
volatile bool transmittedFlag = false;

// this function is called when a complete packet
// is transmitted by the module
// IMPORTANT: this function MUST be 'void' type
//            and MUST NOT have any arguments!
#if defined(ESP8266) || defined(ESP32)
ICACHE_RAM_ATTR
#endif
void setFlag(void) {
  // we sent a packet, set the flag
  transmittedFlag = true;
}

// counter to keep track of transmitted packets
int count = 0;

void loop() {
  // check if the previous transmission finished
  if (transmittedFlag) {
    // reset flag
    transmittedFlag = false;

    if (transmissionState == RADIOLIB_ERR_NONE) {
      // packet was successfully sent
      Serial1.println(F("transmission finished!"));

      // NOTE: when using interrupt-driven transmit method,
      //       it is not possible to automatically measure
      //       transmission data rate using getDataRate()

    } else {
      Serial1.print(F("failed, code "));
      Serial1.println(transmissionState);

    }

    // clean up after transmission is finished
    // this will ensure transmitter is disabled,
    // RF switch is powered down etc.
    radio.finishTransmit();

    // wait a second before transmitting again
    delay(1000);

    // send another one
    Serial1.print(F("[SX1278] Sending another packet ... "));

    // you can transmit C-string or Arduino string up to
    // 255 characters long
    String str = "Hello World! #" + String(count++);
    transmissionState = radio.startTransmit(str);

    // you can also transmit byte array up to 255 bytes long
    /*
      byte byteArr[] = {0x01, 0x23, 0x45, 0x67,
                        0x89, 0xAB, 0xCD, 0xEF};
      transmissionState = radio.startTransmit(byteArr, 8);
    */
  }
}

Can you please suggest me where i am wrong,
thanks for your time,
best Regards,
Anand Pathak,
INDIA

[jgromes]

If you want to use SPI2 for your SX1278 module, you need to tell RadioLib that this is the SPI you want to use. Otherwise, it will use the default SPI. See SPI setup wiki page and the troubleshooting guide.

PS: Also, you seem to be using incorrect tags to denote source code in your posts, [code] instead of ``` (triple backticks). See Markdown cheatsheet in GitHub docs or my edit to your post.

[anandspathak]

Thank you,
For your help...it works now...
Regards
Anand Pathak