Send characters via IR Remote protocol

sketch_ir_sender.ino

/*
 * TinySender.cpp
 *
 *  Example for sending using TinyIR. By default sends simultaneously using all supported protocols
 *  To use a single protocol, simply delete or comment out all unneeded protocols in the main loop
 *  Program size is significantly reduced when using a single protocol
 *  For example, sending only 8 bit address and command NEC codes saves 780 bytes program memory and 26 bytes RAM compared to SimpleSender,
 *  which does the same, but uses the IRRemote library (and is therefore much more flexible).
 *
 *
 * The FAST protocol is a proprietary modified JVC protocol without address, with parity and with a shorter header.
 *  FAST Protocol characteristics:
 * - Bit timing is like NEC or JVC
 * - The header is shorter, 3156 vs. 12500
 * - No address and 16 bit data, interpreted as 8 bit command and 8 bit inverted command,
 *     leading to a fixed protocol length of (6 + (16 * 3) + 1) * 526 = 55 * 526 = 28930 microseconds or 29 ms.
 * - Repeats are sent as complete frames but in a 50 ms period / with a 21 ms distance.
 *
 *
 *  This file is part of IRMP https://github.com/IRMP-org/IRMP.
 *  This file is part of Arduino-IRremote https://github.com/Arduino-IRremote/Arduino-IRremote.
 *
 ************************************************************************************
 * MIT License
 *
 * Copyright (c) 2022-2024 Armin Joachimsmeyer
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
 * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 ************************************************************************************
 */
#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library. 
// On an arduino UNO:       A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO:   2(SDA),  3(SCL), ...
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32

#define MAX_MESSAGE 25
#include "TinyIRSender.hpp"

// This object (display) represents the SD1306 screen
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
    pinMode(LED_BUILTIN, OUTPUT);

    Serial.begin(115200);

    // Just to know which program is running on my Arduino
    Serial.println(F("START " __FILE__ " from " __DATE__ "\r\nUsing library version " VERSION_TINYIR));
    Serial.print(F("Send IR signals at pin "));
    Serial.println(IR_SEND_PIN);

    // SD1306 initialization
    // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
    if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
      Serial.println(F("SSD1306 allocation failed"));
      for(;;); // Don't proceed, loop forever
    }

    // Show initial display buffer contents on the screen --
    // the library initializes this with an Adafruit splash screen.
    display.setTextSize(2);
    display.setTextColor(WHITE);
    display.setCursor(0, 17);
    display.startscrolldiagright(0x0F, 0x0F);
    display.display();
    
    delay(2000); // Pause for 2 seconds

    // Clear the buffer
    display.clearDisplay();
    display.display() ;
    
}

/*
 * Set up the data to be sent.
 * The compiler is intelligent and removes the code for 16 bit address handling if we call it with an uint8_t address :-).
 * Using an uint16_t address or data requires additional 28 bytes program memory for NEC and 56 bytes program memory for FAST.
 */
uint8_t sAddress = 0x02;
//uint16_t sAddress = 0x02;
uint8_t sCommand = 0x34;
//uint16_t sCommand = 0x34;
uint8_t sRepeats = 0;

void loop() {
    
    // Send with NEC
    // NEC uses 8 bit address and 8 bit command each with 8 bit inverted parity checks
  
    sAddress = 99;
    sRepeats = 0;
    // clip repeats at 4
    if (sRepeats > 4) {
        sRepeats = 4;
    }
    //display.print( "Sending") ;
    //display.display( ) ;
    get_and_send_message( ) ;
    delay(1000);  // delay must be greater than 5 ms (RECORD_GAP_MICROS), otherwise the receiver sees it as one long signal
}

void get_and_send_message (void ) 
{
    // from: https://forum.arduino.cc/t/read-char-over-serial-solved/153697/9
    static char buffer[MAX_MESSAGE];
    static unsigned char index = 0;
    char c;
  
  while (Serial.available() > 0) 
  {
    c = Serial.read();
    //Serial.print(c );
    if (c == '\r') 
    {
      
      for( int i = 0 ; i < strlen( buffer ) ; i++)
        {
            display.print( buffer[i] ) ;
            //display.startscrolldiagright(0, 0x10) ;
            display.display( ) ;
           //sCommand = send_str[i] ;
            //Serial.println((char)sCommand) ;
            sendNEC(IR_SEND_PIN, sAddress, ( char ) buffer[i], 0, 0);
            delay( 100) ;
        
        }
      sendNEC(0x00, '\r', sRepeats); 
      buffer[0] = 0;
      index = 0;
    } else 
    {        
      if (index < MAX_MESSAGE-1) 
      {
        buffer[index++] = c;
        buffer[index] = 0;
      }
    }
  } 
  display.display() ;
}