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  VS Arduino › Visual Micro › Installation & Troubleshooting › Adding ARM libraries to linker search path
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Hot Topic (More than 8 Replies) Adding ARM libraries to linker search path (Read 11281 times)
markvr
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Adding ARM libraries to linker search path
Dec 22nd, 2013 at 1:00pm
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Hi All,

I'm trying to use Visual Micro with Atmel Studio and a Teensy 3.

It works fine for simple projects, but when I try to use the ARM DSP libraries, I get the following error:
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TeensyAtmelTest.ino : undefined reference to `arm_cmplx_mag_f32'
collect2.exe* : : error: ld returned 1 exit status


This works OK using the Arduino IDE, so Visual Micro obviously can't find the libraries.  I found the libraries in .\arduino\hardware\teensy\cores\teensy\ and tried adding that path to the Linker Library search path, but it made no difference.

I'm not sure what else to try - how can I configure Visual Micro to find these libraries?

Thanks!
  
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Tim@Visual Micro
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Re: Adding ARM libraries to linker search path
Reply #1 - Dec 22nd, 2013 at 2:07pm
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Hi,

The Arduino build process is a bit different to normal compilers so we don't use the compiler and linker settings from the Atmel project. This is why your attempted fix didn't work.

To include other non-default libraries with Arduino or Teensy they need to be placed in 1 of a few locations. It sounds like vm is failing to find the location so please explain where you have installed the library and we will tell you how to fix it.

Please also provide download link to libs

Thanks
« Last Edit: Dec 22nd, 2013 at 2:09pm by Tim@Visual Micro »  
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markvr
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Re: Adding ARM libraries to linker search path
Reply #2 - Dec 22nd, 2013 at 2:44pm
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Hi,

Thanks for the reply, the library is libarm_cortexM4l_math.a , and installed by the Teensy installer (http://www.pjrc.com/teensy/teensyduino.html) ; into \hardware\teensy\cores\teensy\ within the Arduino IDE installation folder.

The header file is at \hardware\teensy\cores\teensy3\arm_math.h

Thanks,
Mark
  
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Tim@Visual Micro
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Re: Adding ARM libraries to linker search path
Reply #3 - Dec 22nd, 2013 at 3:00pm
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Thanks, the paths do not look like a library (in conventional Arduino/Teensy terms) it looks like a "core" file so should always be compiled.

1)
Which defines (speed etc) have you set for your board in Visual Micro?

2)
Please zip and email your sketch folder to info [at] visualmicro.com so that we can see your settings and test this out.

Thanks
  
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Tim@Visual Micro
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Re: Adding ARM libraries to linker search path
Reply #4 - Dec 22nd, 2013 at 3:01pm
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ps: sorry I missed the location in your first clear report.
  
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markvr
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Re: Adding ARM libraries to linker search path
Reply #5 - Dec 22nd, 2013 at 3:10pm
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Hi,

The defines (if I've understood you correctly) are F_CPU=96000000;USB_SERIAL;LAYOUT_US_ENGLISH 

Sent email with project attached.

Thanks,
Mark
  
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Tim@Visual Micro
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Re: Adding ARM libraries to linker search path
Reply #6 - Dec 22nd, 2013 at 3:26pm
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Hi,

Thanks for sending the files so quickly. This certainly looks like a bug we are going to take a look at it.

If it is a bug there should be a simple hack you can make to your VisualMicro installation to get it working until the next release.

Post more later today or over next 24/48 hours.

Thanks reporting this.
  
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Re: Adding ARM libraries to linker search path
Reply #7 - Dec 22nd, 2013 at 3:27pm
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no worries, many thanks for the prompt response!!
  
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Re: Adding ARM libraries to linker search path
Reply #8 - Dec 22nd, 2013 at 3:31pm
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Thanks

ps: In the meantime if you click File>Preferences>External editor in the Arduino/Teensy Ide you will be able to edit/save using Atmel and upload using Teensy. 

The setting forces Teensy to reload the sketch sources from disk when you click compile. So both IDE's can have the same sketch open at the same time.
  
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Re: Adding ARM libraries to linker search path
Reply #9 - Dec 22nd, 2013 at 9:24pm
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UPDATE: This is resolved in the next release of Visual Micro (couple of weeks). 

More Info

In recent editions of the Teensy/Arduino Ide, the ARM maths library is defined using a new boards.txt configuration property called teensy3.build.additionalobject. 

For Tensy 3.0 boards this property is defined as -larm_cortexM4l_math and is added to the linker "include" statements. 

The current release of Visual Micro does not support this new property. Whilst it is possible to correct the problem by configuring a linker override for Visual Micro it's a bit of faffing and probably best to wait for the next release. 

Please let us know if you can't wait for the next release. In the meantime please see the previous note in this thread about the External Editor property of the Arduino Ide.

Thanks for the prompt about the linker script.
  
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Re: Adding ARM libraries to linker search path
Reply #10 - Dec 23rd, 2013 at 9:15am
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cool that's perfect thanks!  A couple of weeks is fine, that was the fastest bug report to fix I've ever seen Smiley
  
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