Shield-LCD-16x2 - Button dont work when edit

[Bjorny]

I just bought the "Shield-LCD-16x2" to my Arduino. I found something strange. When edit something on row 2 and position 16, the buttons do not work anymore. I tried it on two different Arduinos. See the modified code below (based on the example code Olimex provide).

"lcd.readButtons" and "buttons & 0x02" will stay "0" all time.

Any solution?



////////////////////////////
#include <LCD16x2.h>
#include <Wire.h>
LCD16x2 lcd;
int buttons;

void setup(){
  Wire.begin();
  Serial.begin(9600);
 
  lcd.lcdSetBlacklight(100);
  lcd.lcdClear();
  lcd.lcdGoToXY(2,1);
  lcd.lcdWrite("BUT1:");
  lcd.lcdGoToXY(10,1);
  lcd.lcdWrite("BUT2:");
  lcd.lcdGoToXY(2,2);
  lcd.lcdWrite("BUT3:");
  lcd.lcdGoToXY(10,2);
  lcd.lcdWrite("BUT4:");
}
void loop(){

/*
If I add the two lines, type anything (X) on row 2
and position 16 - every read button will be 0.
No button work anymore when push.

*/

//!
lcd.lcdGoToXY(16,2);
lcd.lcdWrite("X");
//!


buttons = lcd.readButtons();

Serial.print(lcd.readButtons());
Serial.print("--> ");
Serial.print(buttons & 0x01);
Serial.print(", ");
Serial.print(buttons & 0x02);
Serial.print(", ");
Serial.print(buttons & 0x04);
Serial.print(", ");
Serial.print(buttons & 0x08);
Serial.println();

  lcd.lcdGoToXY(7,1);
  if(buttons & 0x01)
    lcd.lcdWrite("0");
   else
    lcd.lcdWrite("1");
 
  lcd.lcdGoToXY(15,1);
  if(buttons & 0x02) 
    lcd.lcdWrite("0");
  else
    lcd.lcdWrite("1");
     
  lcd.lcdGoToXY(7,2);
  if(buttons & 0x04) 
    lcd.lcdWrite("0");
  else
    lcd.lcdWrite("1");
   
  lcd.lcdGoToXY(15,2);
  if(buttons & 0x08) 
    lcd.lcdWrite("0");
  else
    lcd.lcdWrite("1");
}

[LubOlimex]

My colleague tested your code without any changes with OLIMEX OLIMEXINO-328 and SHIELD-LCD16x2 and the buttons worked fine.

What Arduno board exactly are you using?

Edit: no issues with OLIMEXINO-32U4 either

[Bjorny]

Hi,

Something strange happend when I installed board and library.
After reinstallation, it works!


Thanks for your time!