Internet Radio + HD44780 + scroll text - Help Wanted

RE: Internet Radio + HD44780 + scroll text

frogandtoad — Thu, 14 Jul 2022 14:28:33 +0000

@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?

Much safer and easier to handle.

Cheers

RE: Internet Radio + HD44780 + scroll text

SinC_int — Tue, 12 Jul 2022 12:20:47 +0000

I found a solution.

strcat(LargeText, info);

Thread to be closed.

RE: Internet Radio + HD44780 + scroll text

SinC_int — Mon, 11 Jul 2022 12:26:55 +0000

#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);
}
}
else
{
for (int iChar = iCursor; iChar < (iLenOfLargeText - 1) ; iChar++){ // This code takes care of printing charecters of current string.
lcd.print(LargeText);
}
for (int iChar = 0; iChar <= 20 - (iLenOfLargeText - iCursor); iChar++){ // Reamining charecter will be printed by this loop.
lcd.print(LargeText);
}
}
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

RE: Internet Radio + HD44780 + scroll text

Ron — Fri, 08 Jul 2022 17:15:46 +0000

@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.

RE: Internet Radio + HD44780 + scroll text

SinC_int — Fri, 08 Jul 2022 17:05:35 +0000

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

The delay line breaks everything.

RE: Internet Radio + HD44780 + scroll text

Ron — Thu, 07 Jul 2022 23:04:22 +0000

@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();

RE: Internet Radio + HD44780 + scroll text

byron — Thu, 07 Jul 2022 22:59:03 +0000

@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. 😮

RE: Internet Radio + HD44780 + scroll text

Ron — Thu, 07 Jul 2022 22:53:12 +0000

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

RE: Internet Radio + HD44780 + scroll text

byron — Thu, 07 Jul 2022 22:51:54 +0000

@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.

RE: Internet Radio + HD44780 + scroll text

Ron — Thu, 07 Jul 2022 22:51:35 +0000

@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();
}