Displaying character.

Wah you must be really OUT OF YOUR MIND!!! Do you know that i am just a TEENAGER who is asking for help in my SCHOOL PROJECT that is due in a FEW WEEKS... now you are telling me i've been in a course for nine months... Why are you starting all this mess??
I think you better confront your FIDDELEY GEEK!!!

Wah you must be really OUT OF YOUR MIND!!! Do you know that i am just a TEENAGER who is asking for help in my SCHOOL PROJECT that is due in a FEW WEEKS... now you are telling me i've been in a course for nine months... Why are you starting all this mess??
I think you better confront your FIDDELEY GEEK!!!

il'l keep quiet from now on.

i wont even tell Mister Slavenders!

But the saying about C goes: A minute to learn, a lifetime to master.

Hm. Where does that leave C++? "Five minutes to learn, abandon all hope..."?

Not sure if anyone have managed to learn C++ yet...

I try to write it in this way...I am trying to display the letter 'c' to my 8x2 LCD but a line of square dots keep on displaying on the LCD,without displaying a letter.

void lcdwrite(char *letter)
{
  while(*letter)
  {
        lcddata(*letter);
        letter++;
  }
}

void main()
{
  Init_Device();
  lcdinit();
  lcd_clear();
  lcdwrite('c');

}

http://www.keil.com/forum/docs/thread10256.asp

Your definition of lcdwrite has:

void lcdwrite(char *letter)

but your call to it is

  lcdwrite('c');

Spot the mismatch?

The lcdwrite function expects not a character but a pointer to a character or rather a pointer to a number of characters in wich the last character has the value 0x00. This is called a nullterminated string. So it would be better to make the function call look like this:

lcdwrite("Hello world")

Was there no warning message by the compiler?

It seems I am way too slow in posting...

mate,

Our teech told us about this two weeks ago. Look at your revision notes on page 3 where he even gave us an example!

"Look at your revision notes on page 3"

That's the trouble with having all your documentation separate from the source code!

Learn the habit now of always fully-commenting your code
(with specific references to external documents where necessary)

For example:
All functions should have a descriptive header;
All variable definitions should clearly state their purpose, usage, range of values, units of measure, etc

eg

// Write a null-terminated string to the LCD
void lcdwrite
(
   char *letter   // Input: pointer to the string to write
)
{
  while(*letter)
  {
        lcddata(*letter);
        letter++;
  }
}

Think also that "letter" was not a good choice of name for the parameter, was it?

Ya that "letter" was not a good choice of name for parameter... But i still don't get any message displayed on my LCD...Not even a cursor..All i get are row of square dots...

Mr Alias,

go back and look at teech's notes. The code DOES work. I know, im using it here!

" i still don't get any message displayed on my LCD"

If you haven't corrected the call to the function, then it still won't work, will it?

Post your corrected code!

I am not sure what you want to do, or how lcddata() works changing 'c' to "c" may help.
It appears that you want to call lcddata() until you get a null ('\0')
Other wise you are getting the data from Code address 99d then writing until you find a zero in memory

void lcdwrite(char *letter)
{
  while(*letter)
  {
        lcddata(*letter);
        letter++;
  }
}

void main()
{
  Init_Device();
  lcdinit();
  lcd_clear();
  lcdwrite("c"); // This maybe right
}