Detect inifite loop in customed bootloader

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Hi, I work in custumed bootloader based on this proyect DualOptiboot, compiled con debug on and burned in atmega1284. I load test binary file in external SPI flash, but in this process, I have a problem (buffer overflow) and the file was saved with errors. When I started the bootloader it apparently load binary file in the internal flash but does jump to the application code and the MCU crashed (serial port show: SASASASASA....). This problem is solved, but I want to catch this error to recover the MCU and load another code saved in the external flash, for example:

int main(void)
{
  ...  
  // Adaboot no-wait mod
  ch = MCUSR;
  MCUSR = 0;
    
#ifdef DEBUG_ON  
    putch('S');
#endif

  // Read flag saved in external flash or eeprom 
  if( flag is true ){
    // load basic code
    // clear flag
  }

  if (!(ch & _BV(EXTRF))) //if not external reset
  {
    if (ch & _BV(WDRF)) //if reset by watchdog
      CheckFlashImage();
#ifdef DEBUG_ON
    putch('A');
#endif
    SPCR &= ~_BV(SPE) & ~_BV(MSTR);
    appStart(ch);
  }
  ...
}

How can I detect that the bootloader is in an infinite loop and configure a flag to recover the mcu

2

Why do you think it's the bootloader that is in an infinite loop, rather than the application it probably thinks it has successfully loaded and started, crashing?

I can't think of a way to detect the bootloader looping; it's already using the watchdog for other purposes.

3

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