button.c

#include <ModmataC.h>
 
int main() {
    connectArduino("/dev/ttyACM0", 115200, 1);
        
    pinMode(7, INPUT);
        pinMode(13, OUTPUT);
    int value = -1;
        int led_state = LOW;
    
    while(1) {
        value = digitalRead(7);
            if(value && !led_state) {
                    led_state = HIGH;
                    digitalWrite(13, HIGH);
            }
            else if(!value && led_state) {
                    led_state = LOW;
                    digitalWrite(13, LOW);
            }
            printf("%i\n", value);
    }
    
}