Internet Radio + HD44780 + scroll text

@sinc_int

I can't guess what the problem is :), can you give us a hint by telling us what, exactly happens (that shouldn't) or what should happen (that doesn't).

Also, post your code so we can see what's happening in there.

@sinc_int I don't understand, you say you can't scroll the text on line 1 but in the YT vid I see it scrolling.

@sinc_int

I think you are showing an example of scrolling test in a Sony player and are asking how to programatically scroll text on your home built internet player screen ??

If so the following may help.  Of course you would need to send the text to your internet radio's screen (linked to your ESP32) instead of printf to a terminal screen but I hope the example helps (if thats indeed what you were asking)

@byron Wow, I assumed there was a 'scroll' function in the library, didn't know you had to manually do it.

@sinc_int Here is the sample sketch showing how to do scrolling

// include the library code:
#include <LiquidCrystal.h>

// initialize the library by associating any needed LCD interface pin
// with the arduino pin number it is connected to
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
}

void loop() {
  // set the cursor to (0,0):
  lcd.setCursor(0, 0);
  // print from 0 to 9:
  for (int thisChar = 0; thisChar < 10; thisChar++) {
    lcd.print(thisChar);
    delay(500);
  }

  // set the cursor to (16,1):
  lcd.setCursor(16, 1);
  // set the display to automatically scroll:
  lcd.autoscroll();
  // print from 0 to 9:
  for (int thisChar = 0; thisChar < 10; thisChar++) {
    lcd.print(thisChar);
    delay(500);
  }
  // turn off automatic scrolling
  lcd.noAutoscroll();

  // clear screen for the next loop:
  lcd.clear();
}

@zander

Good point and you are probably correct, but I would expect if there is any scrolling text ability for the particular screen being used to be in the driver library for the screen.  

I usually use python these days and the python library for my dinky little 320 x 240 lcd screen does include the ability scroll text. 

@byron I just posted the example before I saw your post. Yes, it does appear to be a library function.

@zander

you are posting too fast for me to keep up, I guess I will have to drink more coffee, or whatever you are on 😀.   I thought you were an old fogey but you are running circles around me. 😮 

@byron That's because one of my legs is shorter.

His answer BTW is to call the autoscroll member of the LCD object. A quick look doesn't tell me how to limit it to just one line, it seems to be the entire display. mylcdobject.autoscroll();

Unfortunately, when I add the scrolling function, the radio is stuttering.

The delay line breaks everything.

@sinc_int Please use the reply link.

I assume you are referring to the sample code I posted. If so just remove the delay, I think the example is flawed, the auto scroll should happen anyway.

#include "Arduino.h"
#include "WiFi.h"
#include "Audio.h"
#include "WiFiManager.h"
#include "time.h"
#include "LiquidCrystal.h"

//Define display pinout
LiquidCrystal lcd(13, 12, 14, 19, 18, 5);

// Define I2S connections
#define I2S_DOUT 25
#define I2S_BCLK 27
#define I2S_LRC 26

// Create audio object
Audio audio;

TaskHandle_t Task1, Task2;

String ssid = "MYSSID";
String password = "MYPASSWORD";
char * LargeText = " Understanding code for scrolling text on 20*2 LCD Display. ";
int iLineNumber = 1; // Line number to show your string (Either 0 or 1)
int iCursor = 0;

void setup() {
Serial.begin(115200); // Start Serial Monitor
lcd.begin (20, 2); // Start LCD display

// Setup WiFi in Station mode
WiFi.disconnect();
WiFi.mode(WIFI_STA);
WiFi.begin(ssid.c_str(), password.c_str());

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}

// WiFi Connected, print IP to serial monitor
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("");
lcd.setCursor(0, 0);
lcd.print("IP: ");
lcd.print(WiFi.localIP());
delay(2000);
lcd.clear();
lcd.print("Radio Italo4you");

// Connect MAX98357 I2S Amplifier Module
audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
audio.setVolume(10); // Set thevolume (0-100)
audio.connecttohost("http://s0.radiohost.pl:8018/stream"); //connect to stream

xTaskCreatePinnedToCore( codeForTask1, "stream", 15000, NULL, 2, &Task1, 0);
delay(500); // needed to start-up task1?
xTaskCreatePinnedToCore( codeForTask2, "txt", 15000, NULL, 2, &Task2, 1);
}

void codeForTask1( void * parameter ) {
for (;;) {
audio.loop(); //out radio stream
}
}

void audio_showstreamtitle(const char *info) {
// LargeText = info; // it doesnt work
Serial.print("streamtitle "); Serial.println(info);
}

void UpdateLCDDisplay()
{
int iLenOfLargeText = strlen(LargeText); // Calculate lenght of string.
if (iCursor == (iLenOfLargeText - 1) ){ // Reset variable for rollover effect.
iCursor = 0;
}
//lcd.clear();
lcd.setCursor(0,iLineNumber);
if(iCursor < iLenOfLargeText - 20) // This loop exicuted for normal 20 characters.
{
for (int iChar = iCursor; iChar < iCursor + 20 ; iChar++) {
lcd.print(LargeText[iChar]);
}
}
else
{
for (int iChar = iCursor; iChar < (iLenOfLargeText - 1) ; iChar++){ // This code takes care of printing charecters of current string.
lcd.print(LargeText[iChar]);
}
for (int iChar = 0; iChar <= 20 - (iLenOfLargeText - iCursor); iChar++){ // Reamining charecter will be printed by this loop.
lcd.print(LargeText[iChar]);
}
}
iCursor++;
}

void codeForTask2( void * parameter ) {
for (;;) {
UpdateLCDDisplay(); // Scoll text by 1 character
delay(350); // Change delay to change speed for scrollig text.
}
}
void loop() {
}

This is my code. 

How to display 'info' as 'LagreText'?

Regards

SinC

I found a solution.

      strcat(LargeText, info);

Thread to be closed.

@sinc_int

Posted by: @sinc_int

I found a solution.

      strcat(LargeText, info);

Thread to be closed.

That is actually a serious error, and if it worked, it's only by chance... that's what "undefined behavior" means in C and C++.

Why not just use Arduino "String" type or the in ESP32, the ISO C++ std::string from #include<string>?

Much safer and easier to handle.

Cheers