probably something like this....
#define REF_VOLTAGE 2.56
float voltage = 0.0;
voltage = ADC_VALUE * ( refVoltage / 2 ^ 10 );
double check that the compiler compiled the part in parentheses to a
constant.
As others have said, you will want to do fixed point math or other
unit scaling once you fill your code space, as adding code floating
point is expensive in code space.
typical solution....
at a 2.56 volt reference you have 2.5 mV per bit. so do the math
using integers, with this fact known.
Have fun
On Mar 4, 2009, at 6:18 PM, Rodney McCray wrote:
Does anyone have any working sample code that shows how to convert
10 bit
ADC outputs into floating points using GCC.
I need to work with floating points on an ATtiny25.
Best Regards,
Rodney
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