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This process has shown you how to set breakpoints and single-step through Java code.

What happens if you try to step into the process() function?

The debugger will step over the function because it is written in C.

Debugging in c

Debugging in C is done using ndk-gdb , which is supported in Eclipse. To do this, first terminate any existing debug session and then on the Android device, exit the current application by hitting the home button.

To configure GDB, switch back to the C/C++ Perspective and do the following:

  1. Click Run>Debug Configurations...
  2. Select Android NDK Application and press the New icon, and rename the configuration to Lab4 (1) .
  3. On the Android tab:
    1. Under Project , hit Browse... and select the current project.
    2. Under Misc. , select Attach to the running application .
  4. On the Debugger tab:
    1. Select the GDBserver Settings tab.
    2. Use the APK bundled GDBserver.
  5. Apply the settings and Close .

In order to launch GDB, you must first run the application on the Android device, and then attach GDB to the running application. To do this:

  1. Set a breakpoint inside the for loop in process.c .
  2. Click Run>Run . You should see the application launch on the Android device, ignoring any Java breakpoints that you have set.
  3. After the application starts, click Run>Debug As...>Android NDK Application . The Debug Perspective should launch again, but this time with gdbserver debugger . The processor will halt at the set C breakpoint.
If Android NDK Application does not show up, make sure that Lab 4 is highlighted in the Project Explorer before trying to launch the debugger.

In the Expressions window, the sb.get(0) (which is a Java method) will have generated an error as we are now debugging in C. Verify that inBuf has the same values as the test vector look-up table by adding inBuf[0] to the list of expressions; check several different array indices.

Exporting variables to a file

A useful feature that is fully supported in CCS is the ability to export processor memory to a file, which can then be imported into MATLAB for further analysis. To enable this feature in Eclipse, the lab machines have the eVars plugin installed. As an example, to export the inBuf array to file:

  1. In the Debug Perspective , go to Window>Show View>Variables .
  2. Right-click on the inBuf pointer and select Display as Array .
  3. Click the Expand Variables icon multiple times until the entire array has been expanded.
  4. Once the array is fully expanded, click on the Export Variables icon, and save to a txt file.
  5. Use evars2array.m to read in the text file into a MATLAB vector.

In the next lab, we will see how to create and write to a file on the Android device, and use adb to download this file to the host machine, directly from MATLAB.

Part 3: a spectrogram algorithm in matlab

As an initial step towards implementing the spectrogram in Android, you will first implement it in MATLAB. [link] shows the components that your spectrogram algorithm should have; the ability to overlap, while important, will be left for extra credit, and is therefore optional.

Spectrogram components

Overlap->Window->Zero-pad->FFT->Magnitude squared->log()

If you need to see an existing implementation, type open spectrogram in the MATLAB prompt. This will open the spectrogram function you used in the Prelab.

Questions & Answers

how can chip be made from sand
Eke Reply
is this allso about nanoscale material
Almas
are nano particles real
Missy Reply
yeah
Joseph
Hello, if I study Physics teacher in bachelor, can I study Nanotechnology in master?
Lale Reply
no can't
Lohitha
where is the latest information on a no technology how can I find it
William
currently
William
where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
has a lot of application modern world
Kamaluddeen
yes
narayan
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
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Source:  OpenStax, Ece 420 fall 2013. OpenStax CNX. Sep 26, 2013 Download for free at http://cnx.org/content/col11560/1.3
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