Arduino Nano RP2040 Connect pull-up/down resistors having weird behavior

Projects Programming
1

Hello All!

I am having some weird behavior with the following code that is simply debouncing buttons. Running this code on the Arduino Nano RP2040 Connect causes pin 2 (or any other pin) to be read as a logical 0 even though their is a pull-up resistor configured.

#include <Arduino.h>

#define BTN0 2

#define LEDR 4

volatile bool intr0_triggered = false;
void isr0()
{
     intr0_triggered = true;
}

void debounce_call_func(uint8_t pin, uint32_t debounce_time, volatile bool &interrupt_flag, voidFuncPtr func, uint32_t &last_debounce_time, PinStatus desired_state = LOW)
{
     uint32_t current_time;

     if (interrupt_flag) 
     {
          current_time = millis();

          if ((current_time - last_debounce_time) >= debounce_time)
          {
               if (digitalRead(pin) == desired_state)
               {
                    func();
               }

               interrupt_flag = false;
               last_debounce_time = current_time;
          }

     }
}


void ledr(){
     digitalWrite(LEDR, !(digitalRead(LEDR)));
}

void setup()
{
     Serial.begin(PICO_DEFAULT_UART_BAUD_RATE);
     pinMode(BTN0, INPUT_PULLUP);
     attachInterrupt(digitalPinToInterrupt(BTN0), isr0, CHANGE);
     pinMode(LEDR, OUTPUT);
}

uint32_t ldt0 = 0;
void loop()
{
     debounce_call_func(BTN0, 50, intr0_triggered, ledr, ldt0, LOW);
}

I though my board had just malfunctioned, so I rand the following to test if my pulls were just not working.

void setup() {
  pinMode(2, INPUT_PULLUP);
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println(digitalRead(2));
  delay(100);
}

But this works, I am able to read a logical 1 from pin 2.

Anyone know what is causing pin 2 to be read as a logical 0 in my debouncing code? Is it a Arduino quirk?

3

CHANGE? FALLING would make more sense

5

I have tried that, but this does not fix my problem

6

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