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  VS Arduino › Visual Micro › Installation & Troubleshooting › Newbie question on installing math.h library
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Newbie question on installing math.h library
Aug 3rd, 2020 at 10:17am
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I have been programming off and on for 30 years and need a little assistance. I am trying to use math.h with a Nano and while I have found the AVR-libc website, referred to by Arduino.cc and unzipped the biz/tar file, I have not yet been successful in getting it to work with VM. I can see a few .h file but I can see no .CPP files. I'm wondering if I have to some other form of install on the library before I can link to it.
I did do a search through your archives but could see nothing on intalling this particular library. (I have had no issues with the standard IDE ones)
kind regards
  
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Re: Newbie question on installing math.h library
Reply #1 - Aug 3rd, 2020 at 12:26pm
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Hi

Did you try to simply add #include <math.h> to your code?

Visual Micro should work the same as the Arduino IDE, if you can see or use the library in the Arduino IDE then you should be able to automatically do the same in Visual Micro.

The math.h is part of the Arduino core for Nano, Uno, Mega boards and can simply be #included. 

If I missing the point then please explain. There are a lof of potential questions about your configuration. The information requested in yellow above should answer them thanks.

Thanks

Advanced: Finally, there are many ways to include external code. I am unclear at this time if you are an arduino newbie or a visual micro newbie. Visual Micro does support adding .a and .o files to the \libs folder of a project. This is outside of Arduino but allows the files to be linked and used. It is not a recommended solution but useful for advanced micrcontroller users.

« Last Edit: Aug 3rd, 2020 at 1:24pm by Tim@Visual Micro »  
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Re: Newbie question on installing math.h library
Reply #2 - Aug 3rd, 2020 at 2:31pm
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Hi Tim - yes I started with #include <math.h> or <Math.h> without any luck. I'll try again, now the Arduino IDE compiled it ok.

I developed code for a number of years on CP/M, Forth engines and on Transputers with OCCAM. More recently I have programmed Arduinos and Windows in C# before but I'm a bit rusty and I have just never had to use extensive libraries. You can blame lockdown!
  
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Re: Newbie question on installing math.h library
Reply #3 - Aug 9th, 2020 at 11:39am
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I did some checking - the Arduino IDE compiles a simple test sketch with <math.h> or <Math.h> and will do floating point calculations. It will even accept the maths functions without the #include statement.

Selecting the IDE option in VS/VM  and doing the same in a new VM project causes a similar test program to fail. It does not recognize the library or maths operation (with or without the #include statement). If I look at the library manager in VS/VM - math.h is not listed, but other built-in libraries are. It is a bit strange and reproducible across two different machines. All versions are up to date. I'm probably missing something obvious... just don't know what it is after trying all the obvious things!
  
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Re: Newbie question on installing math.h library
Reply #4 - Aug 9th, 2020 at 12:21pm
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Please follow the guide in yellow above which will show us what you have configured.

Thanks
  
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Re: Newbie question on installing math.h library
Reply #5 - Aug 9th, 2020 at 3:06pm
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I think I found the source of my confusion -   

The compiler works and a simple program does trig and log functions.

I had assumed something was wrong as the intellisense in VS editor kept underlining the library include and function calls as an error. Can I make that go away?
  
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Re: Newbie question on installing math.h library
Reply #6 - Aug 9th, 2020 at 3:53pm
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Great, if you follow the guide in yellow above that will show us what you have configured, which libs you are talking about, which core you are using and which versions.
  
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Re: Newbie question on installing math.h library
Reply #7 - Aug 9th, 2020 at 5:18pm
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Tim I fixed it. I had been using an installation of VS2017. I decided to un-install and install VS2019.  Intellisense is now working and math.h is now being picked up in external dependences.

regards
  
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