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Re: Fixed Point Calculations

From Anssi Saari <as@sci.fi>
Newsgroups comp.arch.embedded
Subject Re: Fixed Point Calculations
Date 2021-01-18 22:00 +0200
Organization An impatient and LOUD arachnid
Message-ID <sm0ft2yypz8.fsf@lakka.kapsi.fi> (permalink)
References (4 earlier) <c10b9d38-2052-416d-b0c9-0dfe90dc680en@googlegroups.com> <rsujet$kv4$1@dont-email.me> <c992ae8e-f603-47ef-9534-1092c2b72327n@googlegroups.com> <ru3epe$fmq$1@dont-email.me> <58324aac-a738-4b0f-9369-6392f272ed21n@googlegroups.com>

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Rick C <gnuarm.deletethisbit@gmail.com> writes:

> Dividing by coding A <= B/C will produce exactly what in hardware using VHDL??? 

I've only done that with Intel FPGAs, that produced an integer divider
from Intel's IP library for my integer division needs. Intel provided
both a pipelined and non-pipelined option for that in their free IP
library.

For floats I'd guess the produced HW might be large. I did try to make a
PID controller with floats but that was a little large so I used
standard fixed point stuff instead, sfixed 23 downto -7 as I recall.
I only used the float to fixed point converter from the standard
floating point library and that was already largish but not too bad.

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Thread

Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-01 02:18 -0800
  Re: Fixed Point Calculations upsidedown@downunder.com - 2021-01-01 13:33 +0200
    Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-03 01:45 -0800
      Re: Fixed Point Calculations Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2021-01-03 12:18 +0200
        Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-03 05:33 -0800
      Re: Fixed Point Calculations upsidedown@downunder.com - 2021-01-03 14:48 +0200
      Re: Fixed Point Calculations David Brown <david.brown@hesbynett.no> - 2021-01-03 15:38 +0100
        Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-03 18:55 -0800
          Re: Fixed Point Calculations David Brown <david.brown@hesbynett.no> - 2021-01-04 09:26 +0100
            Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-17 22:11 -0800
              Re: Fixed Point Calculations David Brown <david.brown@hesbynett.no> - 2021-01-18 08:53 +0100
                Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-18 00:42 -0800
                Re: Fixed Point Calculations Anssi Saari <as@sci.fi> - 2021-01-18 22:00 +0200
                Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-18 13:46 -0800
                Re: Fixed Point Calculations upsidedown@downunder.com - 2021-01-19 10:44 +0200
                Re: Fixed Point Calculations Rick C <gnuarm.deletethisbit@gmail.com> - 2021-01-19 01:14 -0800
                Re: Fixed Point Calculations Anssi Saari <as@sci.fi> - 2021-01-20 09:50 +0200

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