nRF52840_Serial_Serial1_Test.ino

/******************************************************************************
  Simple Serial Test of the Sparkun nRF52840 Mini Bluetooth Development Board
  Written by: Ho Yun "Bobby" Chan
  @ SparkFun Electronics
  Date: May 29, 2020
  
  Description: This sketch sets up the built-in LED, native USB 
  serial port, and hardware serial pins. The nRF52840 will print 
  a message based on the status of the LED to both the Arduino 
  serial monitor using `Serial` and the hardware serial pins 
  using `Serial1`. Any characters sent from an FTDI to the 
  hardware serial pins will display in the Arduino serial monitor.
  
  This was written to test out an issue:
  
      https://github.com/sparkfun/nRF52840_Breakout_MDBT50Q/issues/7

  ========== HARDWARE CONNECTIONS ==========

  Make sure to grab 3x wires and connect it to an USB-to-Serial converter
  like an FTDI.

      nRF52840 Mini <-> FTDI
      ----------------------
            GND     <-> GND
          TX (17)   <-> RX
          RX (15)   <-> TX

  ========== RESOURCES/LIBRARIES ==========

  You will need to make sure to add the Arduino Core files for the nRF52
  and include the board definitions as outlined in:
  https://learn.sparkfun.com/tutorials/nrf52840-development-with-arduino-and-circuitpython#arduino-installation

  This has been tested with the Adafruit_nRF52_Arduino core v0.16.0 and v0.20.1 releases.
  
  Development Environment Specifics:
  Arduino 1.8.10+
  
  License:
  This code is released under the MIT License (http://opensource.org/licenses/MIT)
  Distributed as-is; no warranty is given.
******************************************************************************/

// Define hardware: LED pins and states
const int LED_PIN = 7;
#define LED_OFF LOW
#define LED_ON HIGH

void setup() {
  // Serial is the native USB Serial Port, i.e. Arduino Serial Monitor
  Serial.begin(9600);

  // Serial1 is the Hardware UART Pins
  Serial1.begin(9600);

  // Initialize hardware:
  pinMode(LED_PIN, OUTPUT); // Turn on-board blue LED off
  digitalWrite(LED_PIN, LED_OFF);
}

void loop() {
  if (Serial1.available()) {
    //If we receive data from the Hardware UART pins, we
    //pass data received from hardware uart to the
    //native USB Serial Port (i.e. Arduino Serial Monitor).
    Serial.print("Character received = ");
    Serial.write(Serial1.read());
    Serial.println("");
  }

  //Send serial data to native USB Serial Port
  Serial.println("LED ON!!!");

  //Send serial data out of hardware UART pins
  Serial1.println("Hello FTDI! Just letting you know, the LED is ON!!!");

  digitalWrite(LED_PIN, LED_ON);
  delay(50);



  //Send serial data to native USB Serial Port
  Serial.println("LED off...");

  //Send serial data out of hardware UART pins
  Serial1.println("Hello FTDI! Just letting you know, the LED is off...");

  digitalWrite(LED_PIN, LED_OFF);
  delay(50);
}