Float values to DAC

ALESSANDRO GUERRESCHI

Other Parts Discussed in Thread: DAC8568

Hi, I have a float variable (of 32 bit), that goes from 1.5 to 9. I would send these values to a 16 bit DAC, ( DAC8568).

The conversion would be:

1.5 ---> 0000.0000.0000.0000

9 ---> 1111.1111.1111.1111

Have you in mind an algorithm for implementing this conversion?

Thank you for the help!

0 Roman Ermakov over 13 years ago

Expert 1150 points

may be

DAC-value = (uint16)((float_value-1.5)*8738.13+0.5);

0 ALESSANDRO GUERRESCHI over 13 years ago in reply to Roman Ermakov

Hi! Thank you very much!

Now I will try it!

I have understood that with the "-1.5" you normalize,with the "*8738.13" you obtain a range from 0 to 65535,

in fact 8738.13*7.5 = 65535.9. I don't understand the "+0.5".

0 Roman Ermakov over 13 years ago in reply to ALESSANDRO GUERRESCHI

Expert 1150 points

+0.5 is traditional way in C to round float value (without +0.5 it will truncated). May be you don't need it in your case. just play with it.

thanks

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