How do I check if the 3ds charger is plugged in?

I am writting a function to know wether or not the charger is plugged in my 3ds however my function keep returning false while the charger is plugged in.

I expect my function to return true if the charger is plugged in my 3ds.

Here is the function:

bool isChargerPluggedin() {
    bool chargeState;
    PTMU_GetAdapterState(&chargeState);
    return chargeState == 1;
}

My first attempt to solve my problem was to allocate memory to the chargeState variable:

bool isChargerPluggedin() {
    bool *chargeState = new bool;
    PTMU_GetAdapterState(chargeState);
    bool state = *chargeState == 1;
    delete chargeState;
    return state;
}

My second attempt was by using an global variable to chargeState instead of a local variable :

bool chargeState;
bool isChargerPluggedin() {
    PTMU_GetAdapterState(&chargeState);
    return chargeState == 1;
}

To fix this, you must initialize first the libraries in your main function using the function ptmuInit. You must deinitialize the library before your program exitHere is a example:

int main() {
  ptmuInit();
  // program loop
  while (true) {
    bool isPlugged = isChargerPluggedin();
    ...
  }
  ptmuExit();
}