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Topic: Custom Characters (Read 602 times) previous topic - next topic

Zippyvinman

I just started with LCD's and Custom characters. Why do I always get an error for this?
Code: [Select]
/*
  LiquidCrystal Library - Hello World

Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
library works with all LCD displays that are compatible with the
Hitachi HD44780 driver. There are many of them out there, and you
can usually tell them by the 16-pin interface.

This sketch prints "Hello World!" to the LCD
and shows the time.

  The circuit:
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
* 10K resistor:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)

Library originally added 18 Apr 2008
by David A. Mellis
library modified 5 Jul 2009
by Limor Fried (http://www.ladyada.net)
example added 9 Jul 2009
by Tom Igoe
modified 22 Nov 2010
by Tom Igoe

This example code is in the public domain.

http://www.arduino.cc/en/Tutorial/LiquidCrystal
*/

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

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

byte smile[8] = {
  0b00000,
  0b10001,
  0b00000,
  0b00100,
  0b00000,
  0b10001,
  0b01110,
  0b00000
};

void setup() {
  //Create a pic for smiley
  lcd.createChar(0, smile);
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.write(0);
  //lcd.print("hello, world!");
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}


I just copied the "Hello World" tried to add a custom char by using the Custom character program as a reference. It doesn't seem to be working. Help?

dc42

When I try to compile that, it reports that the call "write(0)" is ambiguous. Try "write((uint8_t)0)" instead. The problem is that 0 can also mean a null pointer in C/C++.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

el_supremo

Quote
Why do I always get an error for this?

Why didn't you say what the error was?

Pete

Zippyvinman


Quote
Why do I always get an error for this?

Why didn't you say what the error was?

Pete


Like him, it's

call "write(0)" is ambiguous

liudr

It's the result of the upgrade to arduino 1.0
If you downgrade to 0023, you won't see this problem. The error is pretty clear, after I dug into the core files and spent time to understand. You will need to do write((uint8_t)0) for all write(0).
Detail is covered in my blog. http://liudr.wordpress.com

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