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      • Worried About Your Dissertation? Here’s How to Ace It!

        Brandon Metcalfe | 03/61/2021 | 11:37 AM

        Many graduate and undergraduate students in various universities in the USA are required to furnish a dissertation as their studies draw to a close. These dissertations are basically an intensive study of a particular topic of their discipline and the formulation of their views regarding it. Great dissertations can open the door to many opportunities for students in the USA. It is a test of their knowledge synthesizing abilities and makes them an authority in their field of study. Producing a coherent and well-structured dissertation is a dream of many university students in the U.SA. However, there are only a few students who know how to go about writing it in the correct manner. There needs to be a proper plan before you embark on your writing process. But do not get worried. These dissertation help tips will assist you in surviving this phase of your life.

        Start writing a great dissertation!

        Writing a thought-provoking thesis is surely not an easy task. However, the process can become a lot more streamlined once you adhere to the points mentioned below.

        1. Choose your topic wisely

        You need to choose a meaningful topic that aligns with your interests and aspirations. A dissertation is a chance for you to communicate your thoughts and views and integrate the knowledge you have accumulated. So, it is essential for you to identify a topic that you find interesting and exciting.

        2. Familiarize yourself with the protocols

        Next, you need to determine the writing guidelines and familiarize yourself with all the rules and referencing style guides. Become aware of your dissertation structure, kinds of resources to use, and forms of analysis. If you are not aware of these things, then you will not be able to fulfill the expectations of your faculty.

        3. Set a clear goal

        Create a goal in your mind so that you remain focused. Determine how much time you will need for researching, gathering data, drafting the thesis, and proofreading. Find out how you will compile your ideas and the time it will take to adjust your content. Determine how you will write the introduction, do the literature review, as well as the methodology. 

        4. Set a clear target

        Do not wait before writing. Many students make mistakes because they are afraid of writing. Set a target for yourself. For example, completing 1000 words every week and keep track of your accomplishments. It will motivate you and make you productive. Check whether you are addressing all the relevant aspects of a section; also, after writing, read and find out if your content is following a logical and coherent pattern.

        5. Do not be afraid to edit

        Do not be in a hurry to finish your dissertation. Editing is vital to generate a coherent dissertation. You should have various parameters for editing and proofreading. Ensure that your argument is well structured and supported by citations. Professors in U.S universities take citations seriously. So, make sure you do not forget about it.

        These tips and tricks will help you to bring about much quality in your dissertation and enhance your writing efficiency.

        Summary: Dissertation writing is a complicated process. The article outlines how students can speed up this process efficiently.

      • Which One to Choose for Flawless Paper: Assignment Editing or Proofreading?

        Lexi Edwards | 03/60/2021 | 11:37 AM

        Many students are confused about assignment editing and proofreading. They are not sure what to choose and what to skip. It has been a topic of debate for many years. You will find a lot of writings on the internet based on this. 

        In this article, you will find the correct and exact answer to your question as 90% professional writers approved it. The rest 10% worries how students will be able to do all these editing and proofreading. 

        Here is the importance of both assignment editing and proofreading that will help you to know what do you want for your writing. 

        What Are Assignment Editing & Proofreading Necessary For?

        As both play a crucial role in making a document flawless and presentable, it is firm to choose any one of them. That’s why, here is the importance of both the features so that you can get what you want for your paper.

        Editing Is Essential for:

        1. An ESL(English as Second Language) student will require editing the most rather than proofreading, no matter what they are writing for. 
        2. ESL students generally face trouble with the English language complexity and curious norms. 
        3. The ESL students who are highly proficient at English speaking can get tripped up by the nuances and contradictions of formal English writings.
        4. Even if you have the English as the first language, you should be careful with sentence formation and the writing tone you use. 

        Proofreading Is Appropriate for: 

        1. If the students are good at self-editing, they may only require proofreading to eliminate the surface errors. 
        2. To make the writing quality of your paper according to publication level, you should perform proofreading. 
        3. It assures the removal of mistakes, inconsistencies and academic-specific abnormalities that can detract from the end-product.

        Get Combined Editing & Proofreading Service with Experts

        Many students can’t edit or proofread their writings and require some experts help. It is not illegal or wrong; you can ask the professionals to do it for you. 

        Advantages of expert’s editing -

        1. They improve the overall quality of writing. 
        2. They enhance the use of discipline language.
        3. They make the expressions crystal clear. 
        4. They remove all the errors and inconsistencies. 
        5. They make your writing style more impactful in the assignment. 

        Advantages of expert’s proofreading - 

        1. They eliminate all the spelling, grammar, and typing errors. 
        2. They maintain consistency between the language & formatting. 
        3. They make good writing more perfect. 
        4. They ensure that the document will be publication-ready. 

        Both the assignment help and proofreading are cheap and affordable for the students. So, don’t hesitate and hire an expert for your document. 

        It is the answer to the most asked question - 

        Which one to choose for the flawless paper: assignment editing or proofreading? 

        Hope, you find these points valid and useful that reflects that both the editing and proofreading are equally helpful to make your paper flawless and better. 

        Summary 

        This article reflects the answer of: which one to choose for the flawless paper: assignment editing or proofreading? If you also want to know the answer, read the entire article from start to end.

      • micrium OS Ucos III, system tick timer lost interupt.

        hung tran manh | 02/53/2021 | 03:08 PM

        Hi everyone, I have a project using Arm cortex A53 ( zyngq MP SOC Ultra+), using Xilinx SDK 2017.4, Ucos III repository 1.43.
        My device work well, and i try to use file system to read/write data to emmc, but after i use a funtion in StanderLone Library ( xilffs  file system lib, i have just used f_open  fution). the system tick timer interupts donot work, i call funtion OSTimeGet the counter doesnot increase, i check the interupt handler UCOS_TmrTickHandler() it doesnot call after i use the xilffs funtion. i get this bug for the second time, the first when i use funtion sleep() ( a basic funtion in xilinx lib). 

        i try to use the other lib system file like ucos-fs but i dont see any example for xilinx, do the ucos-fs is supported with xilinx?

        Anyone can help me plz. thanks so much.

      • WT32i-E better range needed with antenne

        Morten Jorgensen | 11/332/2020 | 11:18 AM

        We make headset device to be used in situations where stability of connection is important.

        We use good quarter wave antenne in both ends but can only reach aboaut 80 meter with ok sound which is not enough.

        We must get 110 to 120 meter in range in test.

        The older WT32 module did have much better connection. 

        Is there something that we can do.

        If we could get the old WT32 module, it would be OK.

        Best Regards

        Morten Joergensen

        MJI-lab

        Denmark

      • Deleted Tweets Viewer

        Drake New | 08/229/2020 | 10:27 AM

        How Can You Search Deleted Tweets Conveniently?

        Twitter is all about tweets. It is the social media that share information through tweets. It is an American social networking and blogging social media app that allows people to share and exchange a lot of things between themselves. Twitter users are aware of the word tweet which is Twitter more famous for. Most of the users want to know how they can find deleted tweets on Twitter. It is one of the most popular social media used by people all over the world. Also, know that there are always newcomers coming to the App to create a new account which means Twitter is adding users every single day in huge numbers. They can check this link to know about it.

         

        How To View Deleted Tweets?

        Well, any experienced Twitter user would know how frustrating it is to delete a tweet accidentally. So don't worry about it. Just read this tutorial to recover your deleted tweets on Twitter which you accidentally or deliberately deleted because of your personal reasons. Using this method you will know how to find someone's deleted tweets. Well, this is the most natural way to restore deleted tweets for you. Also, you can download your Twitter archives that reflect all your history. So, here are the steps to download the Twitter Archive. First, you need to go to Twitter and login to your account. Then just click on "More > Settings and privacy" which is on the left side navigational list. Then on your Twitter account settings page, select "Request Your Archive". After that when you click that "Request your Archive" button. Then Twitter will send an email to the email account registered with that Twitter account. In this way, you can find deleted tweets on Twitter. Now you need to go back to the Settings and privacy page and select "Download archive". After that just select your Twitter data and download it. Then go to the folder in your PC where you saved the data. And in the new Wayback Machine calendar, choose the day you want to view and choose the time, which opens a new Twitter snapshot. Then, once the snapshot opens in a new window, browse through the tweets, retweets, or replies to find the data you’re looking for. You need to one thing i.e. note that the snapshot will reflect date and hours based on the time of the snapshot, not the current date or time. And once again, the above process may not work for you, but it is worth a try. Here we are going to show you how. You know whatever you put on the Internet, will never permanently go away. All of it is stored on some server or computer somewhere, cached, archived, and such. Then there is this app called Snap Bird that many other websites and forum users suggest, to view your deleted Twitter posts and retweets. And with the help of third-party tools, you can see deleted tweets. But, you see the site does not include deleted tweets. And it loads your Twitter profile to allow you to search and view old tweets, retweets, replies, and messages. The next one is to request a copy of your Twitter archive: First, go to your Accounts page in your Twitter account. Then go to “Content”. And from there, you’ll see a button that says “Request Your Archive”. Now, depending on the volume of data that Twitter needs to compile, your copy will arrive within minutes, hours, or even days. And, when your viewable archive is ready, you’ll be sent a push notification that will lead you back to your Twitter accounts page. Then, from here, click the “Download Archive” button. This tells you how to view deleted tweets. And this tool provides you tremendous scope to view removed tweets by just putting the username in the account. And know that it is a very unique and convenient approach to see deleted messages. But, tweets mentioning you and direct messages sent to you could only have seen if the premium feature is applicable. Hence, you can update your account for similar purposes. The next one is the Google Cache which is another quick and straightforward way to see deleted tweets is to find what has stored in your Google cache. In today's world of social media and all, there are only two powerhouses or so-called famous platforms for people and they are Facebook and Twitter. And those of you people with Twitter accounts know the power of your Tweet, what it can do or cause to the world if used properly. We all should know that Twitter itself keeps an archive of all the tweets, even the deleted ones. This way you can search deleted tweets. But for security and privacy of the users, you can never find a tweet someone has deleted on Twitter when you search for it. But know that the original account which has tweeted it can have access to it. And, they can easily request for their archive and see the deleted tweets.

         

        Description

        Twitter can be a great resource for keeping up with interesting people on the internet, learning new things and gaining more information, and staying up-to-date on current trends of the social media world and all of the stupid gossip around the world. However, sometimes it is desirable for us to not follow a person's profile on Twitter, even though you want to read their updates and tweets. This can be for the basic reasons of privacy or because you don't want to make the person's profile to appear more influential by having a higher number of followers on Twitter. But, you know what it is very simple to view deleted tweets on Twitter. 

         

        Conclusion

        In this way, you can see deleted tweets using various third-party tools and various methods that allow you to hack these private accounts on Twitter so that you can see them. So, in this way, you can view deleted tweets on Twitter easily and comfortably without having to break any laws.

         

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      • Deleted Tweets Viewer

        Drake New | 08/229/2020 | 10:27 AM

        How Can You Search Deleted Tweets Conveniently?

        Twitter is all about tweets. It is the social media that share information through tweets. It is an American social networking and blogging social media app that allows people to share and exchange a lot of things between themselves. Twitter users are aware of the word tweet which is Twitter more famous for. Most of the users want to know how they can find deleted tweets on Twitter. It is one of the most popular social media used by people all over the world. Also, know that there are always newcomers coming to the App to create a new account which means Twitter is adding users every single day in huge numbers. They can check this link to know about it.

         

        How To View Deleted Tweets?

        Well, any experienced Twitter user would know how frustrating it is to delete a tweet accidentally. So don't worry about it. Just read this tutorial to recover your deleted tweets on Twitter which you accidentally or deliberately deleted because of your personal reasons. Using this method you will know how to find someone's deleted tweets. Well, this is the most natural way to restore deleted tweets for you. Also, you can download your Twitter archives that reflect all your history. So, here are the steps to download the Twitter Archive. First, you need to go to Twitter and login to your account. Then just click on "More > Settings and privacy" which is on the left side navigational list. Then on your Twitter account settings page, select "Request Your Archive". After that when you click that "Request your Archive" button. Then Twitter will send an email to the email account registered with that Twitter account. In this way, you can find deleted tweets on Twitter. Now you need to go back to the Settings and privacy page and select "Download archive". After that just select your Twitter data and download it. Then go to the folder in your PC where you saved the data. And in the new Wayback Machine calendar, choose the day you want to view and choose the time, which opens a new Twitter snapshot. Then, once the snapshot opens in a new window, browse through the tweets, retweets, or replies to find the data you’re looking for. You need to one thing i.e. note that the snapshot will reflect date and hours based on the time of the snapshot, not the current date or time. And once again, the above process may not work for you, but it is worth a try. Here we are going to show you how. You know whatever you put on the Internet, will never permanently go away. All of it is stored on some server or computer somewhere, cached, archived, and such. Then there is this app called Snap Bird that many other websites and forum users suggest, to view your deleted Twitter posts and retweets. And with the help of third-party tools, you can see deleted tweets. But, you see the site does not include deleted tweets. And it loads your Twitter profile to allow you to search and view old tweets, retweets, replies, and messages. The next one is to request a copy of your Twitter archive: First, go to your Accounts page in your Twitter account. Then go to “Content”. And from there, you’ll see a button that says “Request Your Archive”. Now, depending on the volume of data that Twitter needs to compile, your copy will arrive within minutes, hours, or even days. And, when your viewable archive is ready, you’ll be sent a push notification that will lead you back to your Twitter accounts page. Then, from here, click the “Download Archive” button. This tells you how to view deleted tweets. And this tool provides you tremendous scope to view removed tweets by just putting the username in the account. And know that it is a very unique and convenient approach to see deleted messages. But, tweets mentioning you and direct messages sent to you could only have seen if the premium feature is applicable. Hence, you can update your account for similar purposes. The next one is the Google Cache which is another quick and straightforward way to see deleted tweets is to find what has stored in your Google cache. In today's world of social media and all, there are only two powerhouses or so-called famous platforms for people and they are Facebook and Twitter. And those of you people with Twitter accounts know the power of your Tweet, what it can do or cause to the world if used properly. We all should know that Twitter itself keeps an archive of all the tweets, even the deleted ones. This way you can search deleted tweets. But for security and privacy of the users, you can never find a tweet someone has deleted on Twitter when you search for it. But know that the original account which has tweeted it can have access to it. And, they can easily request for their archive and see the deleted tweets.

         

        Description

        Twitter can be a great resource for keeping up with interesting people on the internet, learning new things and gaining more information, and staying up-to-date on current trends of the social media world and all of the stupid gossip around the world. However, sometimes it is desirable for us to not follow a person's profile on Twitter, even though you want to read their updates and tweets. This can be for the basic reasons of privacy or because you don't want to make the person's profile to appear more influential by having a higher number of followers on Twitter. But, you know what it is very simple to view deleted tweets on Twitter. 

         

        Conclusion

        In this way, you can see deleted tweets using various third-party tools and various methods that allow you to hack these private accounts on Twitter so that you can see them. So, in this way, you can view deleted tweets on Twitter easily and comfortably without having to break any laws.

         

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      • Deleted Tweets Viewer

        Drake New | 08/229/2020 | 10:27 AM

        How Can You Search Deleted Tweets Conveniently?

        Twitter is all about tweets. It is the social media that share information through tweets. It is an American social networking and blogging social media app that allows people to share and exchange a lot of things between themselves. Twitter users are aware of the word tweet which is Twitter more famous for. Most of the users want to know how they can find deleted tweets on Twitter. It is one of the most popular social media used by people all over the world. Also, know that there are always newcomers coming to the App to create a new account which means Twitter is adding users every single day in huge numbers. They can check this link to know about it.

         

        How To View Deleted Tweets?

        Well, any experienced Twitter user would know how frustrating it is to delete a tweet accidentally. So don't worry about it. Just read this tutorial to recover your deleted tweets on Twitter which you accidentally or deliberately deleted because of your personal reasons. Using this method you will know how to find someone's deleted tweets. Well, this is the most natural way to restore deleted tweets for you. Also, you can download your Twitter archives that reflect all your history. So, here are the steps to download the Twitter Archive. First, you need to go to Twitter and login to your account. Then just click on "More > Settings and privacy" which is on the left side navigational list. Then on your Twitter account settings page, select "Request Your Archive". After that when you click that "Request your Archive" button. Then Twitter will send an email to the email account registered with that Twitter account. In this way, you can find deleted tweets on Twitter. Now you need to go back to the Settings and privacy page and select "Download archive". After that just select your Twitter data and download it. Then go to the folder in your PC where you saved the data. And in the new Wayback Machine calendar, choose the day you want to view and choose the time, which opens a new Twitter snapshot. Then, once the snapshot opens in a new window, browse through the tweets, retweets, or replies to find the data you’re looking for. You need to one thing i.e. note that the snapshot will reflect date and hours based on the time of the snapshot, not the current date or time. And once again, the above process may not work for you, but it is worth a try. Here we are going to show you how. You know whatever you put on the Internet, will never permanently go away. All of it is stored on some server or computer somewhere, cached, archived, and such. Then there is this app called Snap Bird that many other websites and forum users suggest, to view your deleted Twitter posts and retweets. And with the help of third-party tools, you can see deleted tweets. But, you see the site does not include deleted tweets. And it loads your Twitter profile to allow you to search and view old tweets, retweets, replies, and messages. The next one is to request a copy of your Twitter archive: First, go to your Accounts page in your Twitter account. Then go to “Content”. And from there, you’ll see a button that says “Request Your Archive”. Now, depending on the volume of data that Twitter needs to compile, your copy will arrive within minutes, hours, or even days. And, when your viewable archive is ready, you’ll be sent a push notification that will lead you back to your Twitter accounts page. Then, from here, click the “Download Archive” button. This tells you how to view deleted tweets. And this tool provides you tremendous scope to view removed tweets by just putting the username in the account. And know that it is a very unique and convenient approach to see deleted messages. But, tweets mentioning you and direct messages sent to you could only have seen if the premium feature is applicable. Hence, you can update your account for similar purposes. The next one is the Google Cache which is another quick and straightforward way to see deleted tweets is to find what has stored in your Google cache. In today's world of social media and all, there are only two powerhouses or so-called famous platforms for people and they are Facebook and Twitter. And those of you people with Twitter accounts know the power of your Tweet, what it can do or cause to the world if used properly. We all should know that Twitter itself keeps an archive of all the tweets, even the deleted ones. This way you can search deleted tweets. But for security and privacy of the users, you can never find a tweet someone has deleted on Twitter when you search for it. But know that the original account which has tweeted it can have access to it. And, they can easily request for their archive and see the deleted tweets.

         

        Description

        Twitter can be a great resource for keeping up with interesting people on the internet, learning new things and gaining more information, and staying up-to-date on current trends of the social media world and all of the stupid gossip around the world. However, sometimes it is desirable for us to not follow a person's profile on Twitter, even though you want to read their updates and tweets. This can be for the basic reasons of privacy or because you don't want to make the person's profile to appear more influential by having a higher number of followers on Twitter. But, you know what it is very simple to view deleted tweets on Twitter. 

         

        Conclusion

        In this way, you can see deleted tweets using various third-party tools and various methods that allow you to hack these private accounts on Twitter so that you can see them. So, in this way, you can view deleted tweets on Twitter easily and comfortably without having to break any laws.

         

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      • Using a script language in EFM32 environment

        Attila Varga | 06/182/2020 | 11:59 AM

        Using a script language in EFM32 environment

        This article describes the usage of a script interpreter in EFM32 environment. The chosen language is the Lua language, the used board is the Silicon Labs Pearl Gecko (SLSTK3402A) starter kit board and the development environment is the standard IDE of Silicon Labs: Simplicity Studio. In the next section a brief description of the script language is provided followed by the goals, requirements and architecture descriptions. You can also find an attached source code and an explanation how to use this example project.

        For the impatient:

         

        • flash the provided .s37 file onto a Pearl Gecko
        • use a terminal emulator (over VCOM) to see the menu (type: help)

        Contents:

          - 1. Brief description of Lua
          - 2. Why do I need a script interpreter?
          - 3. Goals
          - 4. Requirements
          - 5. Architecture
          - 6. Implementation
          - 7. Uploading scripts
          - 8. How to use
          - 9. Future improvements
          - Additional notes:
          - Examples
          - Fazit (conclusion)

        1. Brief description of Lua

        According to the Lua website:
        "Lua is a powerful and fast programming language that is easy to learn and use and to embed into your application."

        The emphasis is here on "embeddable". Lua is a software package designed from start to embed into a so-called "host", which is (in most cases) a foreign, compiled language. Most often it is C, but it can be also any other language. Lua is used in a wide variety  of application, aerospace, photography, research and mostly: in games (due to its speed). It is easy to learn, the hello-world example is a one-liner and the language elements have a low learning threshold.

        An example of Lua code:

        local function run()
          print("--Run--")
          while counter < threshold do
            if IsBtnPushed() then
              if (counter % 8) == 0 then
                print("down")
              end
              Delay(10)
              counter = counter + 1
            else
              counter = 0
            end
          end
        end

        2. Why do I need a script interpreter?

        C is a powerful language, why do I need then an other language?
        What Lua does offer is what C is not good for: dynamic structures, no redundancies, ease of usage, safe environment, automatic memory management and handling strings and other kinds of data with dynamic size.

        Other aspects are that the language is easier to learn by non-programmer thus it gets an environment for a broader user attendance.

        An embeddable script language has the advantage that it can be used as part of the application that is frequently changed without the need of recompilation, for example in handling configuration parameters, automatic test cases, measurements, tryout/oneshot programs, user provided code, customize layout and/or behavior, etc.

        You can give the user the possibility to change something in the application. It is easy to develop and platform independent. But bear in mind that if you provide the possibility to modify something in your application then it must be a safe environment. Fortunately Lua can be configured to have this kind of 'sandbox'.

        3. Goals

        The goal of the project to use a working interpreter embedded in C code. It is not intended to be a complete, full-featured development environment for some kind of application but to provide a firm base to develop one.

        4. Requirements

        The Lua interpreter requires a processor and some amount of random access memory (RAM), it can be satisfied with few resources but - because it is not a stripped down package - it needs some. At startup the Lua interpreter consumes about 17kB of RAM but memory usage depends on the allocation of variables. The interpreter itself needs some memory too and a larger amount of flash for the code itself. Therefore a starter kit with 256kB with RAM and 1MB of flash is used: a Pearl Gecko.

        The starter kit has some hardware, LEDs, buttons, temperature-sensor, LCD display. It provides the possibility to show how a hardware element can be controlled by Lua.

        Also there must be a possibility to upload programs to the starter kit to change its behavior, therefore we need a mechanism to deliver script code (from outside to the kit) that can be executed on the board.

        5. Architecture

        The structure of the project can be seen on the next picture.


        To the main application a Lua interpreter module is linked but it (the main) does not call into it directly. Instead an interface is created where the application can request some services.

        In this project it can require only two things:

        • load a script (from outside)
        • execute the loaded script

        Lua can do a little bit more:

        • control the LEDs (on/off/toggle)
        • read the button states (up/down)
        • read the values from the temperature sensor
        • read and write from/to stdin/stdout (see later)
        • write onto the LCD screen (lines/circles)

        6. Implementation

        Because Simplicity Studio creates makefiles on the fly, it is not difficult to add a Lua interpreter to the project. You have to create a simple example project that fits your needs and add a new folder inside the project directory. Download the Lua source files from the website and copy all the source files into the newly created directory, except `lua.c` and `luac.c` (or exclude both files from the compilation). Both are in the Lua distribution to demonstrate the use of the Lua package. `lua.c` passes the overgiven parameters from the command line to the interpreter; `luac.c` is a Lua 'compiler' (Lua converts the scripts into tokens before executing it). Both has a `main()` function therefore they cannot be added to the project. Don't forget to add the folder to the include directories that other files can include the Lua header files.

        The next step is to create an interface to Lua. This has a predefined protocol. Because Lua is a dynamically typed language, data exchange to the host language occurs over a so-called 'virtual stack'. Lua (or the C code) places values onto that stack and the other language can use it.

        The other thing is to have an interface from Lua to the Gecko SDK (thus to the hardware). This can be done by simply calling functions of the SDK, all the examples and applications do that.

        To have access to the Gecko SDK, Lua has to be extended with C code. C code that is called from Lua must be registered in the interpreter, that means that if the script executes an appropriate statement (e.g. a function call) then the corresponding C code is executed. It communicates (overgives parameters and returns results) over the previously mentioned virtual stack.

        In the example application interface to controlling the LEDs, the LCD display, reading the temperature sensor is implemented. Read and write to the standard input/output files is also implemented (only partly). The Gecko does not have console therefore these read/write operation are redirected to the already present VCOM interface and by connecting a computer to the serial line (with a terminal program) this can be used as a text based interface (for humans and applications).

        Functions that can be called from Lua are as follows:

          print(...)              -- print to console
          LED(0, true)            -- switch LED on/off
          temp, rh = TempRh()     -- measure temperature
          Delay(400)              -- sleep for x miliseconds
          ToggleLED(1)            -- invert LED state
          ClrScr()                -- clear the LCD display
          Line(1,2,3,4)           -- draw a line (on LCD)
          Circle(64,64,40)        -- draw a circle
          LCDrefresh(bool)        -- switch LCD refresh on/off
          bool = IsBtnPushed()    -- read button state (BTN1)
          str  = ReadCon()        -- read a line from terminal
          DrawPixel(x, y)         -- draw a dot on LCD

        To have a console-like user interface the project redirects standard I/O files to a serial line. The SDK has already predefined files for that. Add

        retargetio.c
        retargetserial.c

        to the project files. These pass `printf/getch` type function outputs to the already on the board present VCOM serial line and reads the input from that line. The data will be sent through the USB port to the connected computer. You can use a terminal emulator program (Tera Term, minicom, PuTTY) on your computer to communicate with the board.

        The provided project export (the .sls file) has to be imported (into Simplicity Studio), compiled and flashed onto the Gecko board. The user can use a terminal program to communicate with the application. I use Teraterm because it has the ability to upload files with the XMODEM protocol already implemented. The computer side can be of course a custom application. In that case other type of serial protocol can be used but it have to be implemented on both sides. In that case the file `lfg_xmodem.c` has to be changed/replaced. Baud rate has to be set to the value of 115200.

        lfg_xmodem has a very simple interface, it provides only one function: 
         

        int lfg_XmodemReceive(char *recvBuffer, int recvBufSize, int *actSize);


        It starts the communication and places the received data into the provided text buffer and reports the number of received data into the variable that points `actSize` to. Return value can be LFG_OK or an error code.

        7. Uploading scripts

        There is not much of use of an application when the scripts has to be inserted/compiled into the C code. It loses the flexibility provided by the script language. Therefore the example project uses the XMODEM protocol to copy scripts from a computer to the Gecko board over the serial line. Fortunately there is already a serial line present called VCOM. If you plug in your board via the USB connector it does three things. Implements a JTAG interface, creates an USB mass storage device, realizes a serial communication interface. The latter is used to upload scripts to the board. COM port number can be determined by the Device manager or by the /dev/ttyUSBx file (in Linux).

        XMODEM is a simple file transfer protocol, it allows users to transmit files between computers when both sides use the same protocol. The next picture shows the program structure to receive data:

        8. How to use

        By pressing the reset button on the Gecko board the following lines are displayed on the terminal:

        Lua for Gecko - example application
        memory used :   11.18164 kB
        
        Enter command (or help).
        >
        

        Enter 'help' to display the available commands.

          led 0 on        switch led 0 on
          led 0 off       switch led 0 off
          led 1 on        switch led 1 on
          led 1 off       switch led 1 off
          temp            measure temperature
          clrscr          clear the LCD display
          cls             clear the console
          ---------       ---------------------
          load            load script (from PC) with xmodem protocol
          cat             display loaded script
          dump            display loaded script as hex
          forget          clear loaded script
          run             run loaded script
          help            display help

        Most of them are fairly straightforward, one thing has to be explained: the script upload.

        The XMODEM protocol requires that the receiver (the Gecko board) starts the communication, but the sender (the terminal program) has to be already in 'send' mode and waiting (for the start signal) to start sending. Therefore the first thing is to put the Gecko board into send mode by entering the `load` command. This does not start the communication but waits for an event to start. The Tera Term program must be instructed to send a file (File -> Transfer -> xmodem -> Send... menu item). It will wait for a start signal from the receiver. The start signal can be issued by pressing the `BTN0` button on the Gecko board. Press BTN0.

        That loads a script onto the board. There are already some example scripts that the user can upload (e.g. example1.lua ...). This uploads but does not start the script automatically. To run the script the `run` command has to be entered. Type 'run'.

        a.) enter 'load' on the terminal (Tera Term)
        b.) use send-file in Tera Term
        c.) press 'BTN0' on the Gecko board
        d.) type 'run' into the terminal

        9. Future improvements

        If all went well you have a working environment where you can evaluate Lua running on a Gecko board. But there is a lot of space for improvement.

        • Persistence
          • Scripts should be stored in a persistent storage that they can live also after reset. There is only one such kind of storage: the flash. For that the so-called 'user page' or the 'NVM3' can be used. On a Giant Gecko an SD card can be used.
        • Debug
          • More complex script have also more complex behavior. Sometimes it needs to be evaluated by a step-by-step execution.
        • Radio
          • A good improvement would be to deliver scripts over the air by using a radio board.

        Additional notes:

        • the used XMODEM implementation is not for a production scale application. It has no timeout, no error recovery. Only receive is implemented. It has been only used for the task to deliver code to the board.
        • in the file `luaconf.h` the #define LUA_32BITS is activated to use 32 bit integers.

        Examples

        There are already some examples in the `src` folder:

        • example1.lua:
          •   demonstrates the use of LEDs, measuring temperature and drawing lines on the LCD screen
        • example2.lua:
          •   reads the BTN1 button state and reports it to the terminal
        • example3.lua:
          •   reads a line from the console
        • example4.lua:
          •   displays graphic on the LCD screen

        Fazit (conclusion)

        "Lua is becoming the language of choice for anyone who needs a scripting language that is simple, efficient, extensible, portable, and free. Currently, Lua is being used in areas ranging from embedded systems to Web development and is widely spread in the game industry, where knowledge of Lua is an indisputable asset." (Google.books)

        Lua has a lot of sophisticated additional things under the hood (tables, metatables, threads, user defined types ...), this article scratches only the surface of the possibilities that can be reached by using a powerful script language.

        Thank you. 

      • Simple BLE scanner for Thunderboard (or any EFR32BG kit)

        Tyler | 05/131/2020 | 08:25 PM

        This is a very simple project. It seems that there is no BLE scanner example available for the Blue Gecko parts. Some of the examples involve scanning (for example the SPP example or throughput tester example) but I could not find a simple "hello world" type scanner example. So I decided to write one.

        I tested the example on Thunderboard BG22 kit, but basically it should work on any kit. It is based on the soc-empty example. Only small modification is needed to the source code (app.c) to turn the soc-empty into a BLE scanner.

        The source code is attached. To try it out:

        • create the soc-empty example for your kit
        • replace the original app.c with the attached version
        • in app.h, set DEBUG_LEVEL to 1 and DISABLE_SLEEP to 1

        When you run the example, it starts scanning immediately at boot (unlike the original soc-empty that starts advertising).

        Scan responses are handled in function process_scan_response(). This is based on the code that I copied from the SPP example. I modified the code so that it looks for vendor specific advertising payloads (AD type = 0xFF) and prints the company ID to console. It recognizes Apple company ID (0x004C). If you need to look for any other company identifiers, then the complete list can be found at https://www.bluetooth.com/specifications/assigned-numbers/company-identifiers/

        The example is intentionally left very simple. It includes the basic processing of advertising packets (you can detect device name or company ID). It should be simple to modify the code to parse any kind of packets (such as iBeacon format, or any custom format you might be working with).

        Any questions or suggestions? Drop a note below.

        Here's a sample of what the output looks like:

        If the advertising data contains device name (either full or shortened), then the name is also printed to terminal.

      • Theremin over BLE

        Jesus Grillet | 04/107/2020 | 11:09 AM

        Theremin over BLE project

        The following article goes over an example project for a job fair where the Silicon Labs Budapest participated.

        Project Background:

        The goal of this project was to create an interactive and fun Demo that would catch the attention of the public while being simple and using our hardware. A Theremin accomplishes this by being fun to play with and loud to catch people's attention while showing the capabilities of our wireless and sensor kits.

        Description:

        The theremin will be composed of an EFR32MG12(BRD4162A) and a Si1133/Si115x Optical Sensors Expansion Board(BRD8009A). The sound is played in a mobile phone or a tablet using the MIDI over BLE service.

        Setup

        Project Overview:

        The following image illustrates the setup:

        Diagram

        1. the Optical Sensors Expansion Board(BRD8009A) was used to control the sound, an interface was created using the Gesture mode to poll 2 of the 3 IR LEDs, left and right side. Left side channel controls the volume and right side channel the sound pitch, this is done by measuring the proximity of the hand to the irLED.

        User guide for the Optical sensor board: UG163: Si1133/Si115x Optical Sensor Evaluation Board Rev 3.0 User's Guide Optical Programmer's Toolkit: Si115x_PGM_Toolkit.exe This toolkit is useful for looking at the demos and for evaluating how the part would behave in a real product. We urge customers to add their own overlays or optics to this board and then use this application to see what kind of optical signal their system would see.

        1. The sensor board communicates to the EFR32 via I2C using the Expansion connector

        2. BRD4162A contains an EFR32MG12, it is used in SoC mode as peripheral device advertising to create an application that will parse the data receive from the sensor board to the Midi protocol.

        3. The EFR32 will transmit said data to a connected device using the Midi over BLE protocol. To add this functionality the [KBA_BT_0911: Midi over BLE] (https://www.silabs.com/community/wireless/bluetooth/knowledge-base.entry.html/2019/06/19/kba_bt_0911_midioverble-ZvKw) was used.

        4. Depending on the mobile device used (Android or iOS), an app needs to be downloaded to receive the Midi data in your device. iOS: KORG Module free version app can be used. Android: MIDI BLE Connect app. This app will allow to connect to BLE Midi devices and after connecting the device can be used with any app that supports midi.

        5. In the case of android device a midi output app is needed. FluidSynth MIDI Synthesizer was used in this project, to either output to the phone speaker or to an external one via the headphone jack. For iOS devices the KORG app handles the BLE connection and the midi output.

        Source files

        1. Create a soc-empty example from the SDK example projects.

        2. Copy the files attached in the project root folder and overwrite the existing files.

        3. From the Gatt configurator import the gatt.xml file that was copied into the project root folder.

        4. Copy \developer\sdks\gecko_sdk_suite\v\platform\emdrv\gpiointerrupt\src\gpiointerrupt.c to the soc-empty project

        5. Build and flash

        6. Connect to your device using a Smartphone/Tablet: *Android: download MIDI BLE Connect app and FluidSynth MIDI Synthesizer app. Connect with MIDI BLE connect and open FluidSynth MIDI Synthesizer and select the device. *iOS: download KORG module and connect via the BLE midi menu.

        7. Play with your hands over the sensor.