On 12/03/2011 16:59, Michael Watterson wrote:
> On 12/03/2011 16:47, Oli Glaser wrote:
>> Yes, I have just finished a project using a 16F690 with PID control of a
>> heating element which used floating point. No problems regarding speed,
>> with various other stuff (one wire, LCD, buttons etc) going on, works fi=
ne.
> PID heating is a good example as the system response time is very slow.
> In the early 1980s Westinghouse had PID controllers with 8085, 8051 and Z=
80.
>
> But DSP at 12kHz or Graphics panel on PIC or such some form of Fixed
> point alternatives to Floating point are usually far better. FPGAs
> usually use Fixed point for all DSP.
>
> it depends what the Floating point is for and how much how fast is needed=
..

Yes, this was my reason for giving an example, as I thought the "never=20
use floating point" could give the wrong impression to people.


--=20
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