Segmentation fault when calling member functions, e.g. getChannel, printDetails

[ngfelixl]

Hi, I'm currently trying to build a nodejs nbind c++ addon on top of this library. The configuration and installation of this lib was successful, followed the instructions on this github page for raspberry pi. Next I importet the shared lib to my nbind project and I'm able to create RF24 instances successfully. The program is also able to share data between nodejs and c++. But when I call RF24 member functions (tested printDetails and getChannel) I get a segmentation fault like follows

Thread 1 "node" received signal SIGSEGV, Segmentation fault.
0xb4c15ff8 in bcm2835_peri_read () from /usr/local/lib/librf24.so.1

The printDetails functions breaks after the first 3 lines returning the pins and the clock speed.

Any suggestions on how to debug this?

---

For completion I also share a simplified version of my code. The .cpp file looks as follows

#include <RF24.h>
#include "nrfnode.h"

Nrfnode::Nrfnode(uint16_t cePin, uint16_t spiBus): cePin(cePin), spiBus(spiBus) {
  this->radio = new RF24(cePin, spiBus);
}

uint8_t Nrfnode::getChannel() {
  return this->radio->getChannel();
}

This is the corresponding header

#ifndef NRFNODE_H
#define NRFNODE_H

class Nrfnode {
  uint8_t cePin = 22, spiBus = 0;
  RF24* radio;

  public:
    Nodenrf(uint16_t cePin, uint16_t spiBus);
    uint8_t getChannel();
};

#endif

#include "nbind/nbind.h"
NBIND_CLASS(Nrfnode ) {
  construct<uint8_t, uint8_t>();
  method(getChannel);
}

[ngfelixl]

I have written a test program without nodejs which is working very well without segmentation fault when executing as root. Normal execution leads to the same error. Any suggestions for making it `working as non-root or letting nodejs execute its addons as root (if that's possible)?

[TMRh20]

The bcm SPI driver needs root. You can set it up using spidev driver to use non root. Google for instructions.

On May 25, 2018, at 16:02, Felix Lemke notifications@github.com wrote:

I have written a test program without nodejs which is working very well without segmentation fault when executing as root. Normal execution leads to the same error. Any suggestions for making it `working as non-root or letting nodejs execute its addons as root (if that's possible)?

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[ngfelixl]

Spidev driver is working, but now every function call (printDetails etc) in nodejs prints Error: can't send spi message. Even gdb does not print any c++ related issues, but if I remove the calls it works. In the test program without node everything works as expected, even without root. Any ideas?

[mitch85]

same issue after update nodejs to 12.18.0 and nrf24 to 0.1.5. Before with node js v 8.x and nrf24 0.1.4 it works fine

[2bndy5]

closing this as it doesn't seem to require changes on our end