GPIO Interrupt - Callback function not getting called
Posted: Fri Mar 30, 2018 1:53 amHi,
I am new to ESP8266 Node MCU.
I am trying to write simple GPIO Interrupt code.
I want to trigger interrupt when pin D1 is driven low, and change toggle on-board led. However, my ISR isn't getting triggered. Can someone please point out my mistake?
I am new to ESP8266 Node MCU.
I am trying to write simple GPIO Interrupt code.
I want to trigger interrupt when pin D1 is driven low, and change toggle on-board led. However, my ISR isn't getting triggered. Can someone please point out my mistake?
Code: Select all
#include <string.h>
#define BLUE_LED_PIN 16
#define GPIO_D1 1
unsigned char state = 0;
unsigned short int interrupt_count = 0;
void callback()
{
if (state == 0)
{
digitalWrite(BLUE_LED_PIN, LOW);
Serial.print("LED ON ");
state = 1;
}
else
{
digitalWrite(BLUE_LED_PIN, HIGH);
Serial.print("LED OFF ");
state = 0;
}
interrupt_count++;
Serial.print(interrupt_count);
Serial.print(" ");
}
void setup()
{
pinMode(BLUE_LED_PIN, OUTPUT);
Serial.begin(115200);
pinMode(GPIO_D1, INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(GPIO_D1), callback, LOW);
// interrupts();
Serial.print("Counter=");
Serial.print(interrupt_count);
Serial.print("\n");
Serial.print("waiting 4 interrupt ");
}
void loop()
{
// Serial.print(digitalRead(GPIO_D1));
// Serial.print(" ");
}