Undefined reference to `setup()' and undefined reference to `setup()' --esp32

PlatformIO IDE
1

Hi I am just getting started with Platform ide and I found this error while trying to build esp32 project
c:/users/salah/.platformio/packages/toolchain-xtensa-esp32/bin/…/lib/gcc/xtensa-esp32-elf/8.4.0/…/…/…/…/xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32dev\libFrameworkArduino.a(main.cpp.o):(.literal._Z8loopTaskPv+0x8): undefined reference to setup()' c:/users/salah/.platformio/packages/toolchain-xtensa-esp32/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32dev\libFrameworkArduino.a(main.cpp.o):(.literal._Z8loopTaskPv+0xc): undefined reference to loop()’
c:/users/salah/.platformio/packages/toolchain-xtensa-esp32/bin/…/lib/gcc/xtensa-esp32-elf/8.4.0/…/…/…/…/xtensa-esp32-elf/bin/ld.exe: .pio\build\esp32dev\libFrameworkArduino.a(main.cpp.o): in function loopTask(void*)': C:/Users/Salah/.platformio/packages/framework-arduinoespressif32/cores/esp32/main.cpp:42: undefined reference to setup()’
c:/users/salah/.platformio/packages/toolchain-xtensa-esp32/bin/…/lib/gcc/xtensa-esp32-elf/8.4.0/…/…/…/…/xtensa-esp32-elf/bin/ld.exe: C:/Users/Salah/.platformio/packages/framework-arduinoespressif32/cores/esp32/main.cpp:48: undefined reference to `setup()’

2

Without providing your code it’s impossible that we know what is going on.

3

I am trying to scan for available ble devices ,this is the code :
#include <Arduino.h>
#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>

class MyAdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks {
void onResult(BLEAdvertisedDevice advertisedDevice) {
// Not used here since we’re performing scanning in the loop
}
BLEScan* pBLEScan;

void setup() {
Serial.begin(115200);
BLEDevice::init(“ESP32 Scanner”);
pBLEScan = BLEDevice::getScan();
pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
pBLEScan->setActiveScan(true);
}

void loop() {
BLEScanResults foundDevices = pBLEScan->start(5); // Scan for 5 seconds

for (int i = 0; i < foundDevices.getCount(); i++) {
    BLEAdvertisedDevice device = foundDevices.getDevice(i);
     Serial.print("Found BLE Device: ");
     Serial.print("Name: ");
     Serial.print(device.getName().c_str());  // Convert to C-style string
     Serial.print(", MAC: ");
     Serial.print(device.getAddress().toString().c_str());  // Convert to C-style string
     Serial.print(", RSSI: ");
     Serial.print(device.getRSSI());

    if (device.haveManufacturerData()) {
        std::string manufacturerData = device.getManufacturerData();
        Serial.print(", Data: ");
        for (size_t j = 0; j < manufacturerData.size(); j++) {
            Serial.printf("%02X ", manufacturerData[j]);
        }
    }

    Serial.println();
}

delay(5000); // Wait for 5 seconds before scanning again

}

};

4

platform.ini
[env:esp32dev]

platform = espressif32

board = nodemcu-32s

framework = arduino

lib_deps = armmbed/ble@^2.7.0

5

Format your code and you’ll see the misplaced right brace. You are declaring setup() and loop() in the MyAdvertisedDeviceCallbacks class. They need to be global.

1 Like
6

thank you sir ,that was a stupid mistake :man_facepalming: