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Send A Number Of Characters To LCD

 
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gazzanet



Joined: 19 Feb 2009
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Send A Number Of Characters To LCD
PostPosted: Thu Feb 19, 2009 4:49 am     Reply with quote

Hello, I'm using a LCD with built in ASCI compatible driver.

My code as it stands send 1 character per line, I want to be able to type all the characters together on one line.

After the LCD setup the program enables the register select bit.

I then use...... DATA('H'); //this sends a h to the lcd
if i then send DATA('I'); //this sends I to lcd

By sending the register select back to low the lcd displays HI

I can't seem to get a string working correctly what i have tried is....
Code:

void writestring(const rom char *s)
{
     unsigned char c;
     while((c=*s++)!='\0')
      DATA(c);
}

The error i get is in the declaration of the string.
Code:
void writestring(const rom char *s);

the error it gives is expected a , or )


Thanks in advance
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Feb 19, 2009 3:39 pm     Reply with quote

See this post for an example of how to declare 'const' strings, and then
pass a pointer to them, to another function:
http://www.ccsinfo.com/forum/viewtopic.php?t=34682&start=4
gazzanet



Joined: 19 Feb 2009
Posts: 3

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PostPosted: Fri Feb 20, 2009 4:26 am     Reply with quote

Yes i found the same thing in the ccs manual in the end after a very long looking time.

Is this the explanation of the answer you gave ?......

A (non-standard) feature has been added to the compiler to help get around the problems created
by the fact that pointers cannot be created to constant strings. A function that has one CHAR
parameter will accept a constant string where it is called. The compiler will generate a loop that will
call the function once for each character in the string.

Also. many thanks for your reply Razz
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