freedom | Source files for SiFive 's Freedom platforms

 by   sifive Scala Version: freedome300artydevkit-v1p0p2 License: Apache-2.0

kandi X-RAY | freedom Summary

kandi X-RAY | freedom Summary

freedom is a Scala library typically used in Embedded System applications. freedom has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Attention - As of March 1 2021, SiFive is archiving the freedom repository. The code here is not being actively maintained, and we can’t continue to provide updates while the fpga boards, software ecosystems and other dependencies change. This repository contains the RTL created by SiFive for its Freedom E300 and U500 platforms. The Freedom E310 Arty FPGA Dev Kit implements the Freedom E300 Platform and is designed to be mapped onto an [Arty FPGA Evaluation Kit] The Freedom U500 VC707 FPGA Dev Kit implements the Freedom U500 Platform and is designed to be mapped onto a [VC707 FPGA Evaluation Kit] Both systems boot autonomously and can be controlled via an external debugger.
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              freedom has a medium active ecosystem.
              It has 923 star(s) with 237 fork(s). There are 162 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 64 open issues and 73 have been closed. On average issues are closed in 44 days. There are 6 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of freedom is freedome300artydevkit-v1p0p2

            kandi-Quality Quality

              freedom has no bugs reported.

            kandi-Security Security

              freedom has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              freedom is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              freedom releases are available to install and integrate.
              Installation instructions, examples and code snippets are available.

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            freedom Key Features

            No Key Features are available at this moment for freedom.

            freedom Examples and Code Snippets

            No Code Snippets are available at this moment for freedom.

            Community Discussions

            QUESTION

            Using hex color code from py file in kv file
            Asked 2021-Jun-12 at 17:15

            I am making this program that deals with a lot of colors and it gives the user the freedom to change many of them. In one part of my program I use markup for one of my labels and and I realized something about the 'color' tag.

            When my program starts I want my label to follow the theme but I get this warning when trying to set the color to the theme and it does not show the color correctly:

            ...

            ANSWER

            Answered 2021-Jun-12 at 16:17

            I think u could try this I think u forget use F-string and get the wrong value

            Source https://stackoverflow.com/questions/67950626

            QUESTION

            Change the levels of the categorical predictor in glm in R
            Asked 2021-Jun-09 at 12:29

            I have a predictor variable called "Group", this group has 3 categories (ALTO, MEDIO, BAJO). In my glm for binomial family, the summary shows the intercept + BAJO and MEDIO, but I need to see in my tab_model only ALTO and MEDIO and let BAJO as intercept. Is there any way to change this setting?

            ...

            ANSWER

            Answered 2021-Jun-09 at 12:29

            You can use the relevel() function to specify which level of the factor is the reference level. Assuming the variable Grupo is already a factor, this should work:

            Source https://stackoverflow.com/questions/67904038

            QUESTION

            Why declare a variable as volatile and use Interlocked on it at the same time?
            Asked 2021-Jun-05 at 20:00

            I am reading Joe Duffy's Concurrent Programming on Windows. At the end of the chapter "Memory Models and Lock Freedom", he gives an example of the lock free stack. I have gone through the code and there's one thing I don't understand, that is the need for m_next field to be marked as volatile. Because there is a full memory barrier with Interlocked.CompareExchange right? Does anyone have an idea?

            I have pasted the sample code below.

            ...

            ANSWER

            Answered 2021-Jun-05 at 20:00

            I'll give my two cents, without being 100% sure that what I am about to say is correct. Joe Duffy is a world-class expert in multithreading, but I think that in this implementation he has been overly cautious regarding the cross-thread visibility of the internal state of the LockFreeStack class. The volatility of the Node.m_next field is redundant in my opinion. The Node instances are mutable, but they are only mutated before they are linked in the internal linked list. After that phase they are practically immutable. That mutable phase is performed by a single thread, so there is no chance that another thread may see a stale version of a Node instance.

            That leaves only the possibility of instructions re-ordering, as a reason for declaring the Node.m_next as volatile. Since the n.m_next = h; assignement is sandwiched between reading another volatile field (m_head), and an Interlocked.CompareExchange operation, I would assume that a possible re-ordering of the instructions that would compromise the correctness of the implementation is already prevented, but as I said I am not 100% sure.

            I am pretty sure though that the implementation of the LockFreeStack class could be improved performance-wise, at the cost of becoming slightly more allocatey, by making immutable the Node class. Nowadays (C# 9) this can be achieved simply by switching from type class to type record. This is how such an implementation would look like:

            Source https://stackoverflow.com/questions/67849993

            QUESTION

            Get every possible word from a text
            Asked 2021-Jun-05 at 14:43

            I have a text like this:

            ...

            ANSWER

            Answered 2021-May-24 at 18:10

            You can add it into set so that there wont be any duplicates and remove comma if not required :

            Source https://stackoverflow.com/questions/67676814

            QUESTION

            I want to align the text in my list element that contains a time element
            Asked 2021-Jun-03 at 14:37

            I have problem because my elements are not well align vertically downward the test after the "-" starts haphazardly.

            I have tried enclosing the time tag with div elements and align them so that all the time elements take-up equal space but this does not work it instead separates the

          • into various blocks.

            ...
          • ANSWER

            Answered 2021-Jun-03 at 14:37

            You can add width to .dates itself and change its display property because width won't wrok for inline elements. I moved the character '-' outside so it looks nicer. You can also wrap this in and give some margin to make space so it looks even more nicer.

            Source https://stackoverflow.com/questions/67823333

            QUESTION

            On the Controlabillity of Linearized Free-Floating Systems
            Asked 2021-May-30 at 00:38

            I have been trying to get a linearized version of a MultiBodyPlant without gravity to experiment with LQR for systems without gravity. However, the linearization leads to some interesting phenomena. A simplified example can be found in this google colab notebook.

            When I linearize and check the rank of the controllability matrix for a single free-floating rigid body, I get a rank of 6. This is expected as I use the get_applied_generalized_force_input_port() as the input port, hence making sure that all possible forces can be applied to the system. The system of a single rigid body has 6 degrees of freedom (DoF) and the rank of the controllability matrix is 6, hence it is controllable.

            However, when I use Drake's in-built function IsControllable() to check the controllability, it results False meaning that it thinks the system is not controllable. In the source of the IsControllable() function, the rank of the matrix is checked against the number of rows in the A matrix. I think that this might be causing an issue as the linearization involves the use of quaternions during the AutoDiff (thus adding one more row to the A matrix due to 4 numbers being used for quaternions to represent the state). The linearization process does not know about the unit-quaternion constraint, and hence the A matrix for a system using quaternions will have 1 more row than the DoF of the system.

            I wonder if this is the correct intuition for the controllability mismatch?

            And could this cause issues as other functions within Drake that maybe use the IsControllable() function for verifying controllability?

            ...

            ANSWER

            Answered 2021-May-30 at 00:38

            I think IsControllable() is doing the right thing. If you have a single body with a floating base, then you have 13 state variables (7 positions, 6 velocities). If you were to simply linearize the equations, then you are right that the resulting linear system would not know about the unit quaternion constraint. Asking for controllability of this system would be asking you to drive the system to the origin (quaternion => 0 ~= unit quaternion). Since your dynamics model cannot achieve that, even in the linearization, I expect your system is not controllable in that linearization.

            You could replace the quaternion floating base with a roll-pitch-yaw floating base. We have some API that will make that easier coming in https://github.com/RobotLocomotion/drake/issues/14949 . But in the mean time, you can add the three translations and a BallRpyJoint.

            The alternative to look into the literature on control in SE(3) directly using quaternions. There are elegant results there, but linear analysis won’t help.

            Source https://stackoverflow.com/questions/67676267

            QUESTION

            Custom portal: server-side sign-in
            Asked 2021-May-28 at 11:33

            We have been using APIM since 2018. As the legacy portal has been deprecated and we wanted more freedom, we decided to skip the default APIM portal altogether, and to embed the APIM API methods in our own website, using Postman as the documentation portal.

            Most of the methods are straightforward, but it's not clear how to sign-in the user? We can, of course, fetch their statistics and API keys, but how do we know they are who they claim they are?

            The code in the self-hosted portal in GitHub is more client-side oriented.

            EDIT. From the usersService.ts module it appears that GET /identity with the Authorization header made of Basic and base64-encoded pair of userId:password is to be invoked.

            But I keep getting:

            ...

            ANSWER

            Answered 2021-May-28 at 11:33

            OK, solved (with the help of Microsoft support who sent a screenshot of the method being invoked on their side).

            It seems that the method is not to be invoked from management.azure.com like all the other methods. Nope. It has to be invoked from the Management API URL that can be found in the Management API section of your APIM in Azure.

            Curiously, the management API toggle does not even have to be on.

            Your GET request should be like this:

            https://my_apim_instance.management.azure-api.net/subscriptions/my_subscription_id/resourceGroups/my_resource_group/providers/Microsoft.ApiManagement/service/my_apim_instance/identity?api-version=2019-12-01

            Now cue in the ever-helpful posters with ever-useful post-solution advice.

            Source https://stackoverflow.com/questions/67687803

            QUESTION

            Providing data and variable names in a function in R
            Asked 2021-May-28 at 08:28
            Goal

            I want to provide both the data and variable names in a function. This is because users might provide datasets with different names of the same variables. Following is a reproducible example that throws an error. Please refer me to the relevant resources to fix this problem.

            Also, please let me know what are best practices for writing such functions? In the documentation, should I ask a user to rename their columns or provide a dataset with only the required columns?

            Example ...

            ANSWER

            Answered 2021-May-28 at 08:28

            This seems like a very unusual way to write an R function, but you could do

            Source https://stackoverflow.com/questions/67067296

            QUESTION

            Write a program that reads the contents of a text file and return index of words into Values
            Asked 2021-May-27 at 09:28

            I am doing an exercise from a textbook and I have been stuck for 3 days finally I decided to get help here.

            The question is: write a program that reads the contents of a text file. The program should create a dictionary in which the key-value pairs are described as follows:

            • Key. The keys are the individual words found in the file.
            • Values. Each value is a list that contains the line numbers in the file where the word (the key) is found.

            For example: suppose the word “robot” is found in lines 7, 18, 94, and 138. The dictionary would contain an element in which the key was the string “robot”, and the value was a list containing the numbers 7, 18, 94, and 138.

            Once the dictionary is built, the program should create another text file, known as a word index, listing the contents of the dictionary. The word index file should contain an alphabetical listing of the words that are stored as keys in the dictionary, along with the line numbers where the words appear in the original file.

            Figure 9-1 shows an example of an original text file (Kennedy.txt) and its index file (index.txt).

            Here are the code i tried so far and the functions is not completed, not sure what to do next:

            ...

            ANSWER

            Answered 2021-Jan-02 at 04:13

            You are on the right track. This is how it can be done

            Source https://stackoverflow.com/questions/65535897

            QUESTION

            Precision in summary output of lm R
            Asked 2021-May-26 at 15:21

            I am doing some exercises using package r-exams, in which I print a summary from an lm object and ask students things like, “which is the estimated value of the intercept”. The idea is that the student copies the values of the summary output and use that value as the correct answer. The issue here is that I use the values from coef() function as the correct answers, but this is not a good idea since the precision of these values are quite different from the precision of the values shown in the summary output. Here is an example:

            ...

            ANSWER

            Answered 2021-May-26 at 15:21

            Some useful information for such questions in R/exams:

            • The extol can also be a vector so that you can set different tolerances for coefficients and R-squared etc.

            • When asking about the R-squared, though, I typically ask for it "in percent". Then the same tolerance may be suitable as for the coefficients.

            • I would recommend to control the size of the coefficients suitably so that digits and extol can be set accordingly.

            • Personally, I typically store the exsolution at a higher precision than I request from the students. For example, exsolution could be 12.345678 while I only set extol to 0.01. This makes sure that when the correct answer is rounded to two decimal places it is inside the correct interval determined by exsolution and extol.

            Details on formatting of the coefficients in the summary:

            • It is not obvious where exactly the formatting happens: The summary() method for lm objects returns an object of class summary.lm which has its own print() method which in turn calls printCoefmat(). The latter is the function that does the actual formatting.

            • When setting the digits in these functions, this controls the number of significant digits and not the number of decimal places. This is particularly important when the coefficients become relatively large (say, in the thousands or more).

            • The coefficients are not formatted individually but jointly with the corresponding standard errors. The details depend on the digits, the size of both coefficients and standard errors, and whether any coefficients are aliased or exactly zero etc.

            • Without aliased/zero coefficients the formatting from summary(m0) can be replicated using format_coef(m0) as defined below. That's essentially the boiled-down code from printCoefmat().

            Source https://stackoverflow.com/questions/67535745

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install freedom

            Build and install sbt. Build and install varilator.
            The Makefile corresponding to the Freedom E300 Arty FPGA Dev Kit is Makefile.e300artydevkit and it consists of two main targets:.
            verilog: to compile the Chisel source files and generate the Verilog files.
            mcs: to create a Configuration Memory File (.mcs) that can be programmed onto an Arty FPGA board.
            The Makefile corresponding to the Freedom U500 VC707 FPGA Dev Kit is Makefile.vc707-u500devkit and it consists of two main targets:.
            verilog: to compile the Chisel source files and generate the Verilog files.
            mcs: to create a Configuration Memory File (.mcs) that can be programmed onto an VC707 FPGA board.

            Support

            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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            gh repo clone sifive/freedom

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