ESP32 Forum

Posted: **Tue Jun 25, 2019 5:31 pm**

Hi everyone,

I'm trying to use the ESP RNG but I'm not satisfied by random value returned by

esp_random()

and because I'm not using RF subsystem I need to call

Code: Select all

bootloader_random_enable()

but I'm facing this compiling error :

Code: Select all

main.cpp:26: undefined reference to `bootloader_random_enable()'

I could not find where is defined this function, can you help me ?

Thanks

Posted: **Wed Jun 26, 2019 12:56 am**

Hi Zoptune,

The bootloader_random.h header is missing include guards to work with C++ code.

We will fix this in ESP-IDF, but you can fix it for now by doing this in your main.cpp file:

Code: Select all

extern "C" {
#include "bootloader_random.h"
}

(This workaround will continue to work after we fix the problem in ESP-IDF, also.)

Posted: **Tue Jul 02, 2019 7:52 am**

Hi ESP_Angus and thank you for your answer.

I will try this and come back here if I still have errors.

Thanks

Posted: **Wed Jul 03, 2019 7:23 pm**

Hi,

After trying your fix I still have the same error.

Posted: **Thu Jul 04, 2019 12:09 am**

Hi Zoptune,

What version of ESP-IDF are you using?

Angus

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