How to display floating point variable value on 16x2 lcd?

[Chicky]

Hello..

Im trying to display the contents of floating point variable on my alphanumeric 16x2 lcd..
ex: count = 123.4532 and i want to display on lcd - 'cpm 123.4532'

The floating point value keep changing because it is related to my Timer1 value as external counter divide by some number.

Anyone can help me on this? Thanx a zillion~

[Calamar]

Do you use LCD.C library attached with CCS compiler ?


printf(lcd_putc"\f cpm = %f",myFloatVar);

you must give details, it's a standar LCD module ?
how did you wire it ?

There are a lot of previus topics taloking about that.
_________________
Best Regards
Daniel H. Sagarra
La Plata (Argentina)

[SherpaDoug]

Is it really a floating point number? Or is it fixed point non-integer? Maybe you should print the integer part, then print ".", then print the decimal part. Doing true floats takes a lot of resources.
I often measure things in mm and print the result in meters this way.
_________________
The search for better is endless. Instead simply find very good and get the job done.

[Henk]

Depending on required number of dec. places, I multiply the float by 100, say, for 2 dec. places, then convert to an integer, which is then devide by 100000, to determine thousands, calc the remainder, div by 1000,etc, if you get the idea, remembering to display a "." for the decimal pt. The routine works well, and is adustable for 0 to 2 dec places, but can be modified for more.

[Ttelmah]

Worth also adding, that with the last couple of compiler versions, CCS have added support for this type of scaled integer with the '%w' printf format. The first version with this, had a fault (didn't put a '0' in front of the DP), but they have now fixed this, and indeed added an option to control this. Using such a scaled integer, results in much smaller code than a float. :-)

Best Wishes