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printf question.....

 
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Guest
printf question.....
PostPosted: Thu Jan 03, 2008 5:26 pm     Reply with quote
Hi all,

I have a line of code that outputs two temperatures to an LCD as follows:

Code:

fprintf(LCD, "1: %lu F  2: %lu F", Temp[0], Temp[1]);


Before this code, I test Temp[0] and Temp[1] to be sure they are each in the appropriate range, and their respective sensor has not become disconnected. If a disconnect is detected, I'd like to replace the temperature value with '--' or 'NC' or something like that to flag the user. The problem is how to do this with printf that is setup for numeric data? The data type must be specified and it's a numeric value, not some ASCII text. I can do this with lots of kludgy code, but was wondering if there is a neat and clean way to accomplish it?

Thanks!

Dave
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Thu Jan 03, 2008 5:48 pm     Reply with quote
I don't think there exists a very elegant solution and you will always come to a variation of the code below:
Code:
if Sensor1Disconnected
  fprintf(LCD, "1: NC  ");
else
  fprintf(LCD, "1: %lu F", Temp[0]);

if Sensor2Disconnected
  fprintf(LCD, "  2: NC  ");
else
  fprintf(LCD, "  2: %lu F", Temp[1]);
Guest
PostPosted: Tue Jan 08, 2008 10:52 am     Reply with quote
Hi All,

OK, a related question:

I want to insert the degree symbol into the data that is displayed on the LCD. Here is what I am sending to the serial LCD now:

Code:

fprintf(LCD, "1: %lu F", Temp[0]);


I know that the degree symbol exists in the character set of the LCD display, and I can display it by itself using:

Code:

fputc(0xdf, LCD);


My question is how do I put everything in the same line? If I break the line up into multiple statements, I can't get it to compile Sad

Thanks,

Dave
Ttelmah
Guest
PostPosted: Tue Jan 08, 2008 11:11 am     Reply with quote
Code:

#define DEGREE 0xDF

fprintf(LCD, "1: %lu %cF", Temp[0],DEGREE);


You can also include it directly, with:
Code:


fprintf(LCD, "1: %lu \xDFF", Temp[0);


Best Wishes
Guest
PostPosted: Tue Jan 08, 2008 11:44 am     Reply with quote
Ttelmah,

Great! Works like a charm! Thanks for the tip!

Dave
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