MATLAB: Fixed point coder log10 implementation

Question

I am using 20*log10(val) to get power in a dB

y = 20*log10(3)

But When i am using matlab coder to convert the in c/c++ code.I am gettig an error

Function 'log10' is not defined for values of  class 'embedded.fi'.      

Can someone help me with alternate way of doing dB calculation.

Thank you

Answer 1

qsb = fixed.Quantizer(numerictype(1,32,24));

y0 = quantize(qsb,20*fi(log(double(x)),1,32,24)/fi(log(double(10)),1,32,24)); % log(x)/log(10) for log base 10 i.e. log10

y1 = 20*log10(x);