ESP32 Forum

Posted: **Tue Jun 20, 2023 2:18 am**

Hello,
I'm facing an issue with blinking the onboard RGB LED on my ESP32-C3-devKitM-1 board. According to the ESP32-C3 guide, the RGB LED is connected to GPIO 8. Although I can successfully make the LED blink using Arduino programming, I'm unable to achieve the same result when using C programming with the idf.py and ESP-IDF Framework. The RGB LED remains unresponsive.

Arduino code:

Code: [Select all] [Expand/Collapse]

void setup() {
    pinMode(LED_BUILTIN, OUTPUT);
}
 
void loop() {
    digitalWrite(LED_BUILTIN, HIGH);
    delay(1000);
    digitalWrite(LED_BUILTIN, LOW);
    delay(1000);
}

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C code using ESP-IDF framework:

Code: [Select all] [Expand/Collapse]

#define LED_PIN GPIO_NUM_8
 
void app_main(void){
 
    gpio_reset_pin(LED_PIN);
    gpio_set_direction(LED_PIN, GPIO_MODE_OUTPUT_OD);
 
    while (1){
            gpio_set_level(LED_PIN,1);
            vTaskDelay(1000/portTICK_PERIOD_MS);
 
            gpio_set_level(LED_PIN,0);
            vTaskDelay(1000/portTICK_PERIOD_MS);
        }
 
}

Why is the RGB LED on my ESP32-C3-devKitM-1 board not blinking when I program it using the C programming language and the ESP-IDF Framework, despite being able to successfully achieve the blinking functionality using Arduino?

Posted: **Tue Jun 20, 2023 4:15 am**

Hello Micael, a series of pulses should be sent to addressable RGB LED to turn individual colors on or off. A single call to gpio_set_level() will send to a GPIO only a single on or off signal. Please check the original blink example from ESP-IDF for a complete code that is using led_strip driver to control addressable LEDs.

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