Suppose that a Task on Core 1 has entered a Critical Section (i.e. taskENTER_CRITICAL(&lock)). Now suppose a Task (not an ISR) on Core 0 attempts to enter a Critical Section using the same lock object. Will that cause all of Core 0 to “hang” and spin waiting for lock to become available? Or, will ...

What is the C++ standard used by default in ESP32 Arduino Core v3.0.1? The below code indicates that it's C++ something like "C++21" which I didn't even know was an official version?


void setup() {
Serial.begin(115200);
delay(2000);

auto ver = __cplusplus;
Serial.print("C++ Version ...

but I can't help being curious what your use case is for dynamically grabbing a chunk of RTC memory? What do you gain vs static?

If a global-scope instance of a class is statically allocated in RTC memory, the constructor for that class will run after the ESP wakes up from deep sleep. That may ...

Thanks for the reply, @lbernstone.
Following the link you provided and then digging in the core's source code, I found that the macro CONFIG_ESP_SYSTEM_ALLOW_RTC_FAST_MEM_AS_HEAP is not defined. So, RTC FAST MEM is not available for use as heap when running the Arduino Core.

I assume it must be ...

Hello.
I was looking to dynamically allocate a small amount of heap memory in RTC RAM using:
TheStruct *ptr = reinterpret_cast<TheStruct*>(heap_caps_malloc(sizeof(TheStruct), MALLOC_CAP_RTCRAM | MALLOC_CAP_8BIT));
However, it's returning the nullptr. Additionally, this function is returning 0 ...

chegewara, the version can be changed using the drop-down:

@lbernstone, interesting, thanks. In the meantime, I've found there is some past documentation (for v2.0.14 at least) on the GitHub, but it's format isn’t as nice as the web page I mentioned. To see it, go to https://github.com/espressif/arduino-esp32 , then the page for Release v.2.0.14 ...

What is the version of ESP32 Arduino Core documented at https://docs.espressif.com/projects/arduino-esp32/en/latest/ ?

As the last word in the above URL implies, it's the "latest". But the latest what? It does not appear to be the latest released version which is v2.014. I say this because it ...

Hi all.
So, a pet peeve of mine is technical documentation that uses abbreviations and acronyms without first defining them. IMO, the Espressif documents are replete with this issue. Several references that I keep coming across are “RTC”, “RTC Slow Memory”, “RTC Fast Memory”.

In typical technical ...

What particular chip is this on, btw? (As in ESP32, ESP32-S2, ESP32-C3, ...)

Confirmed the same behavior on:
Adafruit ESP32 Feather Huzzah: ESP-WROOM-32
ESP32 CAM: ESP32-S