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Passing a string to a subroutine and parsing it....

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JAM2014

Joined: 24 Apr 2014
Posts: 138

Passing a string to a subroutine and parsing it....

Posted: Fri May 01, 2015 1:09 pm

Hi All,

I want to send a string to a subroutine like this:

Code:

Display_4D_Text("Hello World");

and then parse it character by character to send the data to a serially connected LCD module. So far, I have got it working.....

Code:

void Display_4D_Text(Char InString)
{
int8 iIndex = 0;

// Here we send the character string command....
fputc(0x00,LCD_Display);
fputc(0x06,LCD_Display);

for ( iIndex=0 ; iIndex<strlen(InString) ; iIndex++ )
{
fputc(InString[iIndex],LCD_Display);
}

//Here we tell the display 'that's it...'
fputc(0x00,LCD_Display);
}

Thanks,

Jack

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Fri May 01, 2015 1:55 pm

Quote:

So far, I have got it working.....

I didn't see that it was working. Your code required a couple changes
to make it work, as shown in bold below.

Quote:

#include <18F4520.h>
#device PASS_STRINGS=IN_RAM
#fuses INTRC_IO, BROWNOUT, PUT, NOWDT
#use delay(clock=4M)
#use rs232(baud=9600, UART1, ERRORS, stream=LCD_Display)

#include <string.h>

void Display_4D_Text(Char *InString)
{
int8 i;

for(i=0; i < strlen(InString); i++)
{
fputc(InString[i], LCD_Display);
}

}

//=================================
void main()
{
Display_4D_Text("Hello World");

while(TRUE);
}

I cut out that parts of your code that I didn't need for the test program,
and I simplified your index variable name.

JAM2014

Joined: 24 Apr 2014
Posts: 138

Posted: Fri May 01, 2015 2:19 pm

Hi,

Sorry, that should have read:

Quote:

So far, I haven't got it working.....

I had tried adding the '*' previously, and figured it should have worked fine like that. What I missed was this:

Code:

#device PASS_STRINGS=IN_RAM

It's now working like a champ!

Thanks!!

Jack

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