R Series FPGA, calculate log base 10 of number =1

Hi all,
I'm stuck on a problem with calculating a base 10 log of a number greater than 1. It seems the natural log function in the High Throughput Math library is limited to the range of 1/e to 1. There must be others who need to work outside this range - how is it done?
thanks,
George
Solved!
Go to Solution.

It looks like you're on the right track, though there's plenty of work left to port to FPGA. The first step would be to modify your error evaluation to use FPGA-supported types, in order to take into account quantization of the LUT values and scaling/interpolation arithmetic. You also need to consider quantization of the x values and include that in your error evaluation unless you can treat the quantized values as exact. 2012 allows SGL types on the FPGA, so that would be a good starting point if it will fit on your target.
Your interpolation scheme is a little complicated; you should be able to do it with a single multiply. There is a Linear Interpolation function on the FPGA Math and Analysis >> Utilities palette. If you right-click on it and select "Convert to SubVI", you can look at the diagram to see how it works. If you go with fixed-point types, you can use Look-Up Table 1D, which will take care of the interpolation for you. It only supports integers, unfortunately, but you can use Fixed-Point to Integer Cast to make use of it in a FXP diagram.

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