several updates

Author: yz88

esp32_interrupts/esp32_interrupts.ino

@@ -5,36 +5,58 @@ Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme
 MAC: 24:0a:c4:c5:4e:c0
 */
 
+#define LED_GPIO_PIN GPIO_NUM_23
+
+bool led_state = 0;
+
+void led_toggle()
+{
+    // set GPIO value to the opposite of the current value
+    digitalWrite(LED_GPIO_PIN, !digitalRead(LED_GPIO_PIN));
+}
+
 struct Button
 {
     const uint8_t PIN;
     uint32_t numberKeyPresses;
     bool pressed;
 };
 
-Button button1 = {32, 0, false};
+Button button_1 = {32, 0, false};
 
-void IRAM_ATTR isr()
+void IRAM_ATTR button_isr()
 {
-    button1.numberKeyPresses += 1;
-    button1.pressed = true;
+    volatile static unsigned long last_interrupt_time = 0;
+    unsigned long interrupt_time = millis();
+    // software debouncing
+    if (interrupt_time - last_interrupt_time > 200UL) // ignores interupts for 200 milliseconds, UL stands for unsigned long
+    {
+        last_interrupt_time = interrupt_time;
+        button_1.numberKeyPresses += 1;
+        button_1.pressed = true;
+        led_toggle();
+    }
 }
 
 void setup()
 {
     Serial.begin(115200);
-    Serial.printf("Setting up parameters.\n");
-    Serial.printf("Button PIN: %u\n", button1.PIN);
-    pinMode(button1.PIN, INPUT_PULLUP);
-    attachInterrupt(button1.PIN, isr, FALLING);
+    Serial.printf("Setting up ....\n");
+    Serial.printf("Button PIN: %u\n", button_1.PIN);
+    pinMode(button_1.PIN, INPUT_PULLUP);
+    attachInterrupt(button_1.PIN, button_isr, FALLING);
+    // init LED GPIO
+    Serial.printf("LED PIN: %u\n", LED_GPIO_PIN);
+    pinMode(LED_GPIO_PIN, OUTPUT);
+    digitalWrite(LED_GPIO_PIN, 0); // instead of 0 you can also use LOW
 }
 
 void loop()
 {
-    if (button1.pressed)
+    if (button_1.pressed)
     {
-        Serial.printf("Button 1 has been pressed %u times\n", button1.numberKeyPresses);
-        button1.pressed = false;
+        Serial.printf("Button 1 has been pressed %u times\n", button_1.numberKeyPresses);
+        button_1.pressed = false;
     }
 
     // Detach Interrupt after 1 Minute
@@ -43,7 +65,12 @@ void loop()
     if (millis() - lastMillis > 60000)
     {
         lastMillis = millis();
-        detachInterrupt(button1.PIN);
+        detachInterrupt(button_1.PIN);
         Serial.println("Interrupt Detached!");
     }
+
+    // the following statements are used to show that loop is still working 
+    // when button is pressed and hold, remove if you want to check software debouncing
+    Serial.printf("void loop() is still doing something!\n");
+    delay(2000);
 }