table setting display on a display 4 * 20

Projects Programming
1

Hello ^ ^
I post my first topic;
I aim on the principle of scrolling, I want to display on a screen 4 * 20 a parameter list contained in a table, my materil: 4 * 20 display and four push buttons (Down Arrow, Up Arrow, Enter and Esc).
My program works correctly when I sent down the list but when I go up the list, I have a
concerns indexing. X after researching various forums, no forum is talking about scrolling on a display 4 * 20.
I put the code and I hope you put me on the track to fix the problem.

Thank you in advance for your participation likely. :drooling_face:

Joel (located in upper Normandy FRance)

/CODE

 PGM_P  PROGMEM paramMess[] = {   "Mess 0",  "Mess 1",   "Mess 2",   "Mess 3",   "Mess 4",   "Mess 5",   "Mess 6",   "Mess 7", 
  "Mess 8",   "Mess 9",   "Mess 10",   "Mess 11"};

int iPosTabCourant=0;
int indiceScrolling=0;
int bMettreAjourScrollingBas=0;
int bMettreAjourScrollingHaut=0;
int iPositionCurseur=0;
int ifirstAff=0;

void loop()
{
  int iPos;
  int iNombreParam=12;
  int  iPosAffichage;
  int iPosCalculeIndex;

GestionKeyLcd(); //lecture des BP

iNombreParam=12;

if (iKeyPress==iKeyDOWN && (iPosTabCourant+indiceScrolling) <((iNombreParam)))
  {
   iPosTabCourant++;
   bMettreAjourScrollingBas=1;
   Serial.print("iPosTabCourant:");
   Serial.print(iPosTabCourant,DEC);
   Serial.print("    ");
   Serial.print("indiceScrolling:");
   Serial.println(indiceScrolling,DEC);
  }
else if ( iKeyPress==iKeyUP && iPosTabCourant>0)
  {
    iPosTabCourant--;
    bMettreAjourScrollingHaut=1;
   Serial.print("iPosTabCourant:");
   Serial.print(iPosTabCourant,DEC);
   Serial.print("    ");
   Serial.print("indiceScrolling:");
   Serial.println(indiceScrolling,DEC);
  }
 else 
   {
     bMettreAjourScrollingHaut=0;
     bMettreAjourScrollingBas=0;
   }
if ( bMettreAjourScrollingHaut==1 || bMettreAjourScrollingBas==1)
  {
    lcd.clear();
    if ( bMettreAjourScrollingBas==1)
      {
       if (iPositionCurseur <3)
         {
           iPositionCurseur++;
         }
       else
         {
           iPositionCurseur=3;
           indiceScrolling++;
         }
      }
      
    if ( bMettreAjourScrollingHaut==1)
      {
       if (iPositionCurseur >0)
         {
           iPositionCurseur--;
         }
       else
         {
           iPositionCurseur=0;
           indiceScrolling--;
         }
      }
  }
if ( bMettreAjourScrollingHaut==0 && bMettreAjourScrollingBas==0)
  {
   lcd.setCursor(1,iPositionCurseur);  
  }

if(ifirstAff==0 || iKeyPress!=iKeyNoPress)
  {
  ifirstAff=1;
   for(iPosAffichage=0;iPosAffichage<4;iPosAffichage++)
    {
       if ( iPosTabCourant+iPosAffichage<iNombreParam)
       {
               lcd.setCursor(1,iPosAffichage); 
               if( iPositionCurseur== iPosAffichage)
               {        //LA c le print de l'item selectionné
                 lcd.print(paramMess[iPosTabCourant-iPositionCurseur+indiceScrolling+iPosAffichage]);
               }
               else
               {        //la c le print des autres items
                  iPosCalculeIndex=iPosTabCourant-iPositionCurseur+indiceScrolling+iPosAffichage;
                  lcd.print(paramMess[iPosCalculeIndex]);
               }
                lcd.setCursor(1,iPosAffichage); 
       }
    }
   }
  iKeyPress=iKeyNoPress;
delay(100);
//fin de la prémiere boucle de traitement du top depart
iFirstLoop=1;
}

4_20lcd.JPG

2

My program works correctly when I sent down the list but when I go up the list, I have a
concerns indexing.

What is that concern? What does the program do that you do not want? What does it not do that you do want?

Please modify your post. Select the code, and press the # button to add the proper code tags around it.

3

thank you for interresting
So when I scroll down the list, no worries
but when I go up the list, it does not work^^

4

Suggest you check out my phi-prompt library.
Here Phi_prompt | LiuDr Electronic Solutions LLC Official Blog
I will read your code when I get home.

5

Your could should be cleaned up first.

  • iPos is not used
  • iFirstLoop and iKeyPress are not defined
  • As far as I see, both pathes after "if( iPositionCurseur== iPosAffichage)" are identical

I guess we also need more information: What exactly did you do before the first iKeyUP?

  1. no iKeyDOWN, then iKeyUP?
  2. iKeyDOWN once, then iKeyUP?
  3. 4x iKeyDOWN, then iKeyUP?

Which is your case which fails 1), 2) or 3) ?

Oliver

6

GestionKeyLcd(); //lecture des BP

What does GestionKeyLcd() do?

If you could add English comment, that would help too. We don't exactly know what each part of your program is doing. I sense that you mixed LCD code with get key code, not a good way to isolate functions and problems. You will need to show the content of GestionKeyLcd().

7

hey^^

thank you for your help, I attached the missing program, I use a pcf8574p for push button and a display for pcf8574p 4 * 20.
You can test the complete code thank you. Joel

int TabAdrPcf[2];
byte EtaTorBp[8];
byte EtaTorBpMem[8];
int TabDataPcf[2];
int TabDataMemPcf[2];
int TabErrPcf[2];
long debounceDelay = 100;    // the debounce time



void GestionKeyLcd()
{
  byte iTor;
  byte iNoKey;
  
  iNoKey=0;
  
  ReadPcf8574(1);
  DeciEnBinaire (TabDataPcf[1],8,EtaTorBp);
  
  // touche fleche haut
if (EtaTorBpMem[0]==1 && EtaTorBp[0]==0)
  {
  iKeyPress=iKeyUP;
  iNoKey=1;
  }
EtaTorBpMem[0]=EtaTorBp[0];
// touche fleche bas
 if (EtaTorBpMem[1]==1 && EtaTorBp[1]==0)
  {
   iKeyPress=iKeyDOWN;
   iNoKey=1;
  }
EtaTorBpMem[1]=EtaTorBp[1];

 //on relache sur enter
 if (EtaTorBpMem[2]==1 && EtaTorBp[2]==0)
  {
   iKeyPress=iKeyEnter;
   Serial.println("KeyEnter Press");
   iNoKey=1;
  }
  EtaTorBpMem[2]=EtaTorBp[2];
  
  
 //on relache Escape
 if (EtaTorBpMem[3]==1 && EtaTorBp[3]==0)
  {
   iKeyPress=iKeyESC;
   iNoKey=1;
  }
  EtaTorBpMem[3]=EtaTorBp[3];
  
  
  
  
  
//on a appuyé sur aucune touche
if(iNoKey==0)
  {
   iKeyPress=iKeyNoPress; 
  }
  
}
/////////////////////////////////////////////////////////////////////////////////////////////////


void DeciEnBinaire(int valeur, int digit, byte nombre[])
{
int  i;
int temp;
temp=valeur;
for (i=0;i<digit;i++)
    {   // itère pour le nombre de digit attendus
       nombre[i]=temp & 1;  // prend le LSB et le sauve dans nombre
       temp = temp >> 1;    // décalage d'un bit sur la droite
    }
}



/////////////////////////////////////////////////////////////////////////////////////////////////

void ReadPcf8574( int iValPcf) 
{
 byte data;
 byte iRx;
 iRx=0;
  Wire.requestFrom(TabAdrPcf[iValPcf], 1);
  if(Wire.available()) 
    {
    data = Wire.receive();
    iRx=1;
    TabErrPcf[iValPcf]==0;
    }
  if (iRx==1)
    {
    TabDataPcf[iValPcf]=data;
  //    Serial.println(data,BIN);
    }
  else
    {
      if (TabErrPcf[iValPcf]==0)
        {
        Serial.print("ERR PCF8574:");
        Serial.println(iValPcf,DEC);
        TabErrPcf[iValPcf]==1;
        }
    }
  
}
8

OK after some reading, I found the following needs change:

bMettreAjourScrollingHaut and bMettreAjourScrollingBas

Besides their long names that maybe only fully meaningful in French (:)), they were only assigned to 1 but never re-assigned to 0 in scroll up or down. That will be the problem. I've renamed them la_up and la_down for clarity:

In scroll up
la_up=1;
la_down=0; // You were missing this

In scroll down, do the opposite.

9

hey^^
thank you for you participation
Cordialement
Joël :slight_smile: