# pinMode()

Configures the specified pin to behave either as an input or an output.

# Syntax

pinMode(pin, mode)

# Parameters

pin:

The embedded board GPIO number. Must be a range from 0 to 256. If your embedded board GPIO goes over the available range contact me (jgarzagu at ucsd.edu).

mode:

Standard modes:
INPUT: Sets GPIO pin number as input.
OUTPUT: Sets GPIO pin number as output.
INPUT_PULLDOWN: Same as INPUT since some embedded boards doesn't have PULL resistos internally.
INPUT_PULLUP: Same as INPUT since some embedded boards doesn't have PULL resistos internally.

Raspberry Pi BCM283x legacy modes:

RPI_INPUT: Sets GPIO pin number as input using "/dev/mem" mapping.
RPI_OUTPUT: Sets GPIO pin number as output using "/dev/mem" mapping.
RPI_INPUT_PULLDOWN: Sets GPIO pin number as input and with a pull down resistor using "/dev/mem" mapping
RPI_INPUT_PULLUP: Sets GPIO pin number as input and with a pull up resistor using "/dev/mem" mapping
RPI_PWM_OUTPUT: Sets GPIO pin number as PWM "/dev/mem" mapping. (TODO add available pins for RPi)

# Example

# Javascript

const linuxduino = require('linuxduino');

// Test digitalWrite
(async() => {
  // Wait for wasm file
  await linuxduino.ready;

  var ledPin = 4; // Embedded board GPIO Number
  linuxduino.pinMode(ledPin, linuxduino.OUTPUT);
  while(1) {
    console.log("LED ON");
    linuxduino.digitalWrite(ledPin, linuxduino.HIGH);
    linuxduino.delay(1000); // Delay 1 sec
    console.log("LED OFF");
    linuxduino.digitalWrite(ledPin, linuxduino.LOW);
    linuxduino.delay(1000); // Delay 1 sec
  }
  return 0;
})();

Run it

sudo node digitalWrite.js

# C++

#include "Linuxduino.h"

// Test digitalWrite
int main(void) {
    int ledPin = 4; // Embedded board GPIO Number
    pinMode(ledPin, OUTPUT);
    while(1) {
        printf("LED ON\n");
        digitalWrite(ledPin, HIGH);
        delay(1000); // Delay 1 sec
        printf("LED OFF\n");
        digitalWrite(ledPin, LOW);
        delay(1000); // Delay 1 sec
    }
    return 0;
}

Run it

g++ digitalWrite.cpp -o digitalWrite -llxduino
sudo ./digitalWrite