runing-text-arduino-mega.ino

// Use the Parola library to scroll text on the display
//
// Demonstrates the use of the scrolling function to display text received
// from the serial interface
//
// User can enter text on the serial monitor and this will display as a
// scrolling message on the display.
// Speed for the display is controlled by a pot on SPEED_IN analog in.
// Scrolling direction is controlled by a switch on DIRECTION_SET digital in.
// Invert ON/OFF is set by a switch on INVERT_SET digital in.
//
// UISwitch library can be found at https://github.com/MajicDesigns/MD_UISwitch
// MD_MAX72XX library can be found at https://github.com/MajicDesigns/MD_MAX72XX
//

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>

// set to 1 if we are implementing the user interface pot, switch, etc
#define USE_UI_CONTROL 0

#if USE_UI_CONTROL
#include <MD_UISwitch.h>
#endif

// Turn on debug statements to the serial output
#define DEBUG 0

#if DEBUG
#define PRINT(s, x)         \
    {                       \
        Serial.print(F(s)); \
        Serial.print(x);    \
    }
#define PRINTS(x) Serial.print(F(x))
#define PRINTX(x) Serial.println(x, HEX)
#else
#define PRINT(s, x)
#define PRINTS(x)
#define PRINTX(x)
#endif

// Define the number of devices we have in the chain and the hardware interface
// NOTE: These pin numbers will probably not work with your hardware and may
// need to be adapted
#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 4
#define CLK_PIN 52
#define DATA_PIN 51
#define CS_PIN 53

// HARDWARE SPI
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);
// SOFTWARE SPI
// MD_Parola P = MD_Parola(HARDWARE_TYPE, DATA_PIN, CLK_PIN, CS_PIN, MAX_DEVICES);

// Scrolling parameters
#if USE_UI_CONTROL
const uint8_t SPEED_IN = A5;
const uint8_t DIRECTION_SET = 8; // change the effect
const uint8_t INVERT_SET = 9;    // change the invert

const uint8_t SPEED_DEADBAND = 5;
#endif // USE_UI_CONTROL

uint8_t scrollSpeed = 100; // default frame delay value
textEffect_t scrollEffect = PA_SCROLL_LEFT;
textPosition_t scrollAlign = PA_LEFT;
uint16_t scrollPause = 2000; // in milliseconds

// Global message buffers shared by Serial and Scrolling functions
#define BUF_SIZE 75
char curMessage[BUF_SIZE] = {""};
char newMessage[BUF_SIZE] = {"Aku adalah anak gembala"};
bool newMessageAvailable = true;

#if USE_UI_CONTROL

MD_UISwitch_Digital uiDirection(DIRECTION_SET);
MD_UISwitch_Digital uiInvert(INVERT_SET);

void doUI(void)
{
    // set the speed if it has changed
    {
        int16_t speed = map(analogRead(SPEED_IN), 0, 1023, 10, 150);

        if ((speed >= ((int16_t)P.getSpeed() + SPEED_DEADBAND)) ||
            (speed <= ((int16_t)P.getSpeed() - SPEED_DEADBAND)))
        {
            P.setSpeed(speed);
            scrollSpeed = speed;
            PRINT("\nChanged speed to ", P.getSpeed());
        }
    }

    if (uiDirection.read() == MD_UISwitch::KEY_PRESS) // SCROLL DIRECTION
    {
        PRINTS("\nChanging scroll direction");
        scrollEffect = (scrollEffect == PA_SCROLL_LEFT ? PA_SCROLL_RIGHT : PA_SCROLL_LEFT);
        P.setTextEffect(scrollEffect, scrollEffect);
        P.displayClear();
        P.displayReset();
    }

    if (uiInvert.read() == MD_UISwitch::KEY_PRESS) // INVERT MODE
    {
        PRINTS("\nChanging invert mode");
        P.setInvert(!P.getInvert());
    }
}
#endif // USE_UI_CONTROL

void readSerial(void)
{
    static char *cp = newMessage;

    while (Serial.available())
    {
        *cp = (char)Serial.read();
        if ((*cp == '\n') || (cp - newMessage >= BUF_SIZE - 2)) // end of message character or full buffer
        {
            *cp = '\0'; // end the string
            // restart the index for next filling spree and flag we have a message waiting
            cp = newMessage;
            newMessageAvailable = true;
        }
        else // move char pointer to next position
            cp++;
    }
}

void setup()
{
    Serial.begin(57600);
    Serial.print("\n[Parola Scrolling Display]\nType a message for the scrolling display\nEnd message line with a newline");

#if USE_UI_CONTROL
    uiDirection.begin();
    uiInvert.begin();
    pinMode(SPEED_IN, INPUT);

    doUI();
#endif // USE_UI_CONTROL

    P.begin();
    P.displayText(curMessage, scrollAlign, scrollSpeed, scrollPause, scrollEffect, scrollEffect);
}

void loop()
{
#if USE_UI_CONTROL
    doUI();
#endif // USE_UI_CONTROL

    if (P.displayAnimate())
    {
        if (newMessageAvailable)
        {
            strcpy(curMessage, newMessage);
            newMessageAvailable = false;
        }
        P.displayReset();
    }
    readSerial();
}