ESP32 Forum

Posted: **Mon Mar 16, 2020 7:29 pm**

I have a button input for my ESP32. I have a simple debouncing that works well and changes a LED with a single click. If I hold the button down, just one light change.

But then I enabled WiFi. Now if I have wifi going, and I press the button, the button constantly cycles while holding it down. Like its bouncing or something. And it cycles through all my light types. But if I increase my interval for checking my debounce time to something high (like 250ms) I do NOT get the 'bouncing' button with WiFi enabled.

Here is my code. If I comment out setup_wifi(); in the main setup, I have no issues. If I change 100 to 250 in the btnISR() I have no problems. Neither of which I want to do. Anyone have any ideas what I'm not understanding.

(sorry the code is messy)

Code: Select all

#include <FastLED.h>
#include <WiFi.h>
#include <PubSubClient.h>

// WIFI
char ssid[]     = "##";
const char* password = "##";

// Static IP Stuff
IPAddress local_IP(##);
IPAddress gateway(##);
IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(8, 8, 8, 8);
IPAddress secondaryDNS(8, 8, 4, 4);


// The definitions to control the actual LEDs through the FastLED library
#define LED_PIN     23
#define NUM_LEDS    8
#define BRIGHTNESS  15 // Up to 255
#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];

#define UPDATES_PER_SECOND 100

// Set up some pallete variables to be used later
CRGBPalette16 currentPalette;
TBlendType currentBlending;



// Set up the buttons(as struct) for controlling the lights
struct Button {
    const uint8_t PIN; // Pin the button is attached to
    uint32_t station;  // station we are 'at'.  0 = white reading, 1 = rainbow, etc
    bool pressed;     // last pressed value (true/false)
};
Button btn01 = {39, 0, true};


/*
 * Intterrupt for button push
 *
 *  IRAM_ATTR is specific for the ESP32 to run faster -- loads it into RAM instead of Flash memory
 */
void IRAM_ATTR btnISR() {
    static unsigned long last_interrupt_time = 0;
    unsigned long interrupt_time = millis();
  
    // If I make this 100 changed to 250, i have no issue
    if (interrupt_time - last_interrupt_time > 100)
    {
        // Do stuff here
        btn01.pressed = true;
        btn01.station += 1;
        if (btn01.station > 6) {
            btn01.station = 0;
        }

    }
    last_interrupt_time = interrupt_time;
}

/*
 * setup_wifi()
 * initial connection to wifi
 */
void setup_wifi() {
    // This calls the config to load in the static stuff
    if (!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS)) {
        Serial.println("STA Failed to configure");
    }

    Serial.println();
    Serial.print("Connecting to ");
    Serial.println(ssid);


    WiFi.begin(ssid, password);

    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("");
    Serial.println("WiFi Connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());

} // end setup_wifi



void fillLEDsFromPalette( uint8_t colorIndex ) {
    uint8_t brightness = 35;
    for (int i = 0; i < NUM_LEDS; i++) {
        leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending );
        colorIndex += 3;
    } 
}

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

    // If I comment out this, and don't initialize wifi, everything works as expected
    setup_wifi();

    
    pinMode(btn01.PIN, INPUT);
    attachInterrupt(digitalPinToInterrupt(btn01.PIN), btnISR, RISING);

    delay( 1500 ); // power-up safety delay
    FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
    FastLED.setBrightness(  BRIGHTNESS );
    
    currentBlending = LINEARBLEND;

} // end setup()

void loop() { 

    static uint8_t startIndex = 0;
    startIndex = startIndex + 1;

    if (btn01.station == 0 and btn01.pressed) {
        Serial.println("White");
        for( int i = 0; i < NUM_LEDS; i++) {
            leds[i] = CRGB::White;
        }
        btn01.pressed = false;
    }
    if (btn01.station == 1 and btn01.pressed) {
        Serial.println("Red");
        for( int i = 0; i < NUM_LEDS; i++) {
            leds[i] = CRGB::Red;
        }
        btn01.pressed = false;
    }
    if (btn01.station == 2 and btn01.pressed) {
        Serial.println("Green");
        for( int i = 0; i < NUM_LEDS; i++) {
            leds[i] = CRGB::Green;
        }
        btn01.pressed = false;
    }
    if (btn01.station == 3) {
        Serial.println("Rainbow");
        currentPalette = RainbowColors_p;
        fillLEDsFromPalette( startIndex ) ;
        btn01.pressed = false;
    }

    FastLED.show();
    FastLED.delay(50);
  

} // end void loop()

ESP32 Forum

Enabling WiFi conflicts with button interrupts??

Enabling WiFi conflicts with button interrupts??