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ADC decimal Digit problem

 
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ailatech



Joined: 24 Jul 2007
Posts: 7
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ADC decimal Digit problem
PostPosted: Sun May 03, 2009 3:13 pm     Reply with quote
Hi all
I have a problem with adc
I want to display a float number consists of 3 decimal digits at least, i tried to use the following:


set_adc_channel( 0 )
delay_us(10);
x=read_adc();
y=x/100;
printf("X=%u Y=%1.3f \r\n",x,y);


But i still get 1.000 or 2.000 only without decimal digits
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Eng. Haytham Shyouk
B.A. Electronics Engineering
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun May 03, 2009 3:52 pm     Reply with quote
Quote:

y=x/100;

i still get 1.000 or 2.000 only

You are doing integer math. If you divide one integer (x) by another
integer (100), the result is an integer.

If you want a floating point result, you must make one of the numbers
in the divison expression into a float. Example:
Quote:
y=x/100.0;


You didn't show any of your variable declarations. 'y' should be declared
as a 'float'. 'x' should be declared as an 'int16' if you are using the A/D
in 10-bit mode. Also, if 'x' is an 'int16', then you should use "%lu" to
display it in printf.
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