calling begin() on Wiznet5500lwIP driver without hardware being connected crashes

Basic Infos

[ X] This issue complies with the issue POLICY doc.
[ X] I have read the documentation at readthedocs and the issue is not addressed there.
[ ] I have tested that the issue is present in current master branch (aka latest git).
[X ] I have searched the issue tracker for a similar issue.
[X ] If there is a stack dump, I have decoded it.
[X ] I have filled out all fields below.

Platform

Hardware: ESP12E
Core Version: Espressif 8266 (3.2.0)
Development Env: PLatform IO framework-arduinoespressif8266 3.30002.0 (3.0.2)
Operating System: Windows

Settings in IDE

Module: WeMos D1 R2 and mini
Flash Mode: ?
Flash Size: 4MB
lwip Variant: default
Reset Method: ?
Flash Frequency: [40Mhz]
CPU Frequency: 80Mhz
Upload Using: OTA & SERIAL
Upload Speed: 115200

Problem Description

I use the Wiznet5500lwIP driver to drive a W5500 chip. The host ESP can use either wifi or ethernet. Therefore the chip is only powered if a physical switch is set on the board to allow saving energy if user choose wifi The problem is that when callig begin() of the driver, it crashes (see dump) if the W5500 is not powered up.

MCVE Sketch


#include <Arduino.h>

Wiznet5500lwIP ethDriver(D2);   

    cableLink = ethDriver.begin(mac);    
    if (cableLink) {
      ESP.wdtDisable();
      loopElapsedTime = millis();
      while (!ethDriver.connected() && (millis() - loopElapsedTime < ETHCONNECTTIMEOUT)) ;
      ESP.wdtEnable(1000);
    } 

    if (!ethDriver.connected()) {
      cableLink = false;
      ethDriver.end();      
      WiFi.mode(WIFI_STA);
      if (!connectWiFi()){        
        stopWifi();             
        WiFi.mode(WIFI_AP_STA);                  
        WiFi.softAP(conf.getValue(MODCONFAPNAME), "", random(12) + 1, false, 1);            
      } 
    }

Debug Messages

Soft WDT reset

stack>>>

0x4023678e in Wiznet5500::wizchip_spi_write_byte(unsigned char) at lib\lwIP_w5500\src\utility/w5500.h:203 (inlined by) Wiznet5500::wizchip_read(unsigned char, unsigned short) at lib\lwIP_w5500\src\utility/w5500.cpp:47 0x402369cc in Wiznet5500::setSn_CR(unsigned char) at lib\lwIP_w5500\src\utility/w5500.cpp:126 0x40236cef in Wiznet5500::getSn_SR() at lib\lwIP_w5500\src\utility/w5500.h:687 (inlined by) Wiznet5500::begin(unsigned char const) at lib\lwIP_w5500\src\utility/w5500.cpp:366 0x4020ef8f in LwipIntfDev::begin(unsigned char const, unsigned short) at C:\Users\progman.platformio\packages\framework-arduinoespressif8266\cores\esp8266/LwipIntfDev.h:169 0x4023a8e8 in String::changeBuffer(unsigned int) at C:\Users\progman.platformio\packages\framework-arduinoespressif8266\cores\esp8266/WString.cpp:202 0x4023c53c in esp_yield at C:\Users\progman.platformio\packages\framework-arduinoespressif8266\cores\esp8266/core_esp8266_main.cpp:123 0x4023cee1 in delay at C:\Users\progman.platformio\packages\framework-arduinoespressif8266\cores\esp8266/core_esp8266_wiring.cpp:57 0x4022fab8 in std::enable_if<std::_and<std::not_<std::is_tuple_like >, std::is_move_constructible, std::is_move_assignable >::value, void>::type std::swap(std::_Any_data&, std::_Any_data&) at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/move.h:197 (inlined by) std::function<bool (PingerResponse const&)>::swap(std::function<bool (PingerResponse const&)>&) at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h:483 (inlined by) std::function<bool (PingerResponse const&)>::operator=(std::function<bool (PingerResponse const&)> const&) at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h:398 (inlined by) Pinger::OnReceive(std::function<bool (PingerResponse const&)>) at .pio\libdeps\debug_version\ESP8266-ping\src/Pinger.cpp:71 0x402212d7 in setup at src/main.cpp:4982 0x40250524 in std::_Function_handler<bool (PingerResponse const&), setup::{lambda(PingerResponse const&)#1}>::_M_manager(std::_Any_data&, std::_Function_handler<bool (PingerResponse const&), setup::{lambda(PingerResponse const&)#1}> const&, std::_Manager_operation) at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h:271 0x402080e0 in std::_Function_handler<bool (PingerResponse const&), setup::{lambda(PingerResponse const&)#1}>::_M_invoke(std::_Any_data const&, PingerResponse const&) at src/main.cpp:4964 (inlined by) invoke_impl<bool, setup()::<lambda(const PingerResponse&)>&, const PingerResponse&> at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/invoke.h:60 (inlined by) __invoke_r<bool, setup()::<lambda(const PingerResponse&)>&, const PingerResponse&> at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/invoke.h:113 (inlined by) _M_invoke at c:\users\progman.platformio\packages\toolchain-xtensa\xtensa-lx106-elf\include\c++\10.3.0\bits/std_function.h:291 0x4023c61b in loop_wrapper() at C:\Users\progman.platformio\packages\framework-arduinoespressif8266\cores\esp8266/core_esp8266_main.cpp:198 0x4010059d in cont_wrapper at C:\Users\progman.platformio\packages\framework-arduinoespressif8266\cores\esp8266/cont.S:81

esp8266 / Arduino