firmware | repository contains pre-compiled binaries
kandi X-RAY | firmware Summary
kandi X-RAY | firmware Summary
This repository contains pre-compiled binaries of the current Raspberry Pi kernel and modules, userspace libraries, and bootloader/GPU firmware.
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QUESTION
There are two different makefiles for this firmware that I am working on. Data Version 1 and Data Version 2. Both versions are using the same file called ble_communication.c in each own make file.
To differentiate between the two versions, we have two variables declared inside ble_communication.c
...ANSWER
Answered 2022-Mar-06 at 03:44To be honest, I would prefer to use the #ifdef, but here is a workaround for you.
Create two files with the desired data and select the required file at build time, using the makefile.
First, prepare two C files, ble_communication_data1.c and ble_communication_data2.c. Feel free to choose a clearer name.
Place the required data in each C file, but keep the names the same.
ble_communication_data1.c
QUESTION
I've been bitten in the ass a few times where I would write to an array out of scope. I have been working on a particular firmware for over 2 years and suspect an overflow which by now is close to impossible to find - for example:
...ANSWER
Answered 2022-Feb-21 at 09:02Recent versions of GCC with the flag -Wall will detect simple errors like the problem in your example, and print a warning.
The tool Valgrind is more advanced, but also more work to configure and use correctly.
There is no tool in the universe that can detect every possible mistake, so start with the easiest to use.
QUESTION
I am trying to link Cortex-M4 firmware with clang + lld. The gcc build works fine. I am using the stock CMSIS linker script with only RAM & ROM size adjusted (bases are the same). Beginning of the script (without comments):
...ANSWER
Answered 2022-Feb-08 at 09:57I fixed it by removing COPY and adding NOLOAD to the stack section. It builds and runs fine both with gcc and clang.
QUESTION
I'm trying to build a JSON tree using recursive API calls but I am having issues with flow control of the data structure. How can I block the flow until the BuildTree function stack ends?
Here is the partial code. Thanks in advance.
...ANSWER
Answered 2022-Jan-28 at 08:18You are using the async keyword for no reason, because you are not using await inside your function. You might as well use it :)
QUESTION
I am currently working on a firmware update mechanism for embedded system with low memories.
Part of the system requires to hash (with SHA-256) the binary file before sending the file (other security features are added but do not impact this question). The device must verify this hash before validating it, but is pretty low on memory. It will receive the data in small chunks, and I am wondering if it is possible to compute partial hash "on the fly", to avoid loading the whole binary again after the full transfer.
As an example, let's say the data to hash is "part1part2part3". The hash of the full data is "hash", the hash of "part1" is "hash1", the hash of "part2" is "hash2" and the hash of "part3" is "hash3".
Is there any mathematical operation I can do to convert partial hashes to the full one? Something like
...ANSWER
Answered 2021-Nov-19 at 14:43The way you've described this is not possible. You cannot combine "subhashes" to determine a full hash. If you could do that, the hash would be subject to length-extension attacks and not be secure. ("Secure" here is defined in a fairly precise and technical way. See the link from Stef about other hashing approaches that loosen this requirement.)
But, as the question's comments note, it is completely possible to stream data into SHA256 without ever holding all the data in memory. That is the normal way that hash functions are computed. SHA256 works on a block size of 64 bytes. That is all the data you need to hold at a time, plus 32 bytes of state.
Most common hashing libraries have this as part of the API. It generally looks something like:
QUESTION
I've installed Windows 10 21H2 on both my desktop (AMD 5950X system with RTX3080) and my laptop (Dell XPS 9560 with i7-7700HQ and GTX1050) following the instructions on https://docs.nvidia.com/cuda/wsl-user-guide/index.html:
- Install CUDA-capable driver in Windows
- Update WSL2 kernel in PowerShell:
wsl --update - Install CUDA toolkit in Ubuntu 20.04 in WSL2 (Note that you don't install a CUDA driver in WSL2, the instructions explicitly tell that the CUDA driver should not be installed.):
ANSWER
Answered 2021-Nov-18 at 19:20Turns out that Windows 10 Update Assistant incorrectly reported it upgraded my OS to 21H2 on my laptop.
Checking Windows version by running winver reports that my OS is still 21H1.
Of course CUDA in WSL2 will not work in Windows 10 without 21H2.
After successfully installing 21H2 I can confirm CUDA works with WSL2 even for laptops with Optimus NVIDIA cards.
QUESTION
I'm grabbing a row from a database using libpqxx and assigning the fields within the pqxx::row to a struct specifically designed to hold those values:
ANSWER
Answered 2021-Aug-24 at 14:18If all else fails, you can always go old school to avoid tedious and error prone repetition:
QUESTION
I am using node js to download large files(300MB) from a server and pipe the response to a file write stream. As far as I understand pipes in nodejs, the data flow is managed by node and I don't have to consider draining and other events. The issue I face is that the memory usage of the docker where my application is running increases in the same amount as the file being downloaded (i.e It seems the file is being saved in memory). This memory usage persists even when I delete the file in the docker. I am attaching the code used for creating request and piping, below for reference. The code is running fine but causing performance issues like huge memory/CPU usage and crashes with OOM error. I am not able to understand what I am doing wrong.
...ANSWER
Answered 2021-Nov-08 at 13:32The problem is that you are using the requestretry package, which does not really support streaming. It does always call request with a callback and will provide a promise that is resolved with the full response. The request library will read the entire response body when such a callback is provided, which indeed does buffer the complete response in memory. This is not what you want.
I don't see a way to do streaming-only with requestretry, so you should use the request package directly (or, given its deprecation, one of its successor libraries) and handle the retry logic yourself.
QUESTION
I need a perl regular expression to select content only if the content is missing either the begining quote or ending quote. The begining quote will always be precedded by an equal symbol =. The ending quote can be followed by a space, more text or carriage return. In one given line there can be many attributes (quote pairs) to check.
I tried (? but that was a disaster. I thought maybe I could just do a simple regex find the equle symbol, look at next character and check if it's a quote followed by text and an end quote. But if there is no quote on the begining or end of the text add it.
Things to note the text in between the quotes will always be character data. There will be no symbols or spaces.
...ANSWER
Answered 2021-Oct-28 at 01:15Using a Branch Reset (?| ... ) (Perl) you can match informative forms
and use a simple replacement.
This will match one of the two missing forms.
QUESTION
According to this firmware post, the HP Prime graphing calculator supports Python. However, I cannot find any guide as to how to run python files in the calculator (even within HP's own 700 page long user manual). Does anyone know how to execute these files?
- For reference, I have HP Prime's connectivity kit (CK) installed, so I am somewhat able to transfer python code (by copy-pasting into CK's "Programs" section). However, I think it's reading it as Prime Programming Language instead, as it does not run.
Edit: HP Prime has rebooted and now there is a Python app, allowing me to run some files. Unfortunately, I cannot access any Python libraries. That is, I can only run files that do not have "import _____" in them. This seems like a problem; anyone know how to resolve?
Also a further problem is that the files are not actually saved in my calculator, as far as I can tell.
...ANSWER
Answered 2021-Sep-08 at 06:44I couldn't really find a good source to read about Python support in this particular brand, but in general, graphing calculators have much more limited memory than personal computers, so they do not choose CPython or any of the heftier implementations of the Python language. They will instead use lightweight implementations like MicroPython or CircuitPython (not these ones exactly but maybe a derivation).
These implementations don't have the full standard library of CPython and can have different modules particular to their intended contexts. There probably ARE some modules you can use, but without proper documentation it's hard to say which. It may go without saying but you are certainly restricted from downloading arbitrary Python libraries.
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