TFT | script PHP to pass tests
kandi X-RAY | TFT Summary
kandi X-RAY | TFT Summary
TFT (Tester for Triplestore) is a script PHP to pass tests through a sparql endpoint.
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- Load data into the specified graph .
- Returns the number of documents in the graph
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TFT Examples and Code Snippets
Community Discussions
Trending Discussions on TFT
QUESTION
I am using a 3.5: TFT LCD display with an Arduino Uno and the library from the manufacturer, the KeDei TFT library. The library came with a bitmap font table that is huge for the small amount of memory of an Arduino Uno so I've been looking for alternatives.
What I am running into is that there doesn't seem to be a standard representation and some of the bitmap font tables I've found work fine and others display as strange doodles and marks or they display upside down or they display with letters flipped. After writing a simple application to display some of the characters, I finally realized that different bitmaps use different character orientations.
My questionWhat are the rules or standards or expected representations for the bit data for bitmap fonts? Why do there seem to be several different text character orientations used with bitmap fonts?
Thoughts about the questionAre these due to different target devices such as a Windows display driver or a Linux display driver versus a bare metal Arduino TFT LCD display driver?
What is the criteria used to determine a particular bitmap font representation as a series of unsigned char values? Are different types of raster devices such as a TFT LCD display and its controller have a different sequence of bits when drawing on the display surface by setting pixel colors?
What other possible bitmap font representations requiring a transformation which my version of the library currently doesn't offer, are there?
Is there some method other than the approach I'm using to determine what transformation is needed? I currently plug the bitmap font table into a test program and print out a set of characters to see how it looks and then fine tune the transformation by testing with the Arduino and the TFT LCD screen.
My experience thus farThe KeDei TFT library came with an a bitmap font table that was defined as
...ANSWER
Answered 2021-Jun-12 at 16:19Raster or bitmap fonts are represented in a number of different ways and there are bitmap font file standards that have been developed for both Linux and Windows. However raw data representation of bitmap fonts in programming language source code seems to vary depending on:
- the memory architecture of the target computer,
- the architecture and communication pathways to the display controller,
- character glyph height and width in pixels and
- the amount of memory for bitmap storage and what measures are taken to make that as small as possible.
A brief overview of bitmap fonts
A generic bitmap is a block of data in which individual bits are used to indicate a state of either on or off. One use of a bitmap is to store image data. Character glyphs can be created and stored as a collection of images, one for each character in the character set, so using a bitmap to encode and store each character image is a natural fit.
Bitmap fonts are bitmaps used to indicate how to display or print characters by turning on or off pixels or printing or not printing dots on a page. See Wikipedia Bitmap fonts
A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has three sizes, and any combination of bold and italic, then there must be 12 complete sets of images.
A brief history of using bitmap fonts
The earliest user interface terminals such as teletype terminals used dot matrix printer mechanisms to print on rolls of paper. With the development of Cathode Ray Tube terminals bitmap fonts were readily transferable to that technology as dots of luminescence turned on and off by a scanning electron gun.
Earliest bitmap fonts were of a fixed height and width with the bitmap acting as a kind of stamp or pattern to print characters on the output medium, paper or display tube, with a fixed line height and a fixed line width such as the 80 columns and 24 lines of the DEC VT-100 terminal.
With increasing processing power, a more sophisticated typographical approach became available with vector fonts used to improve displayed text quality and provide improved scaling while also reducing memory required to describe the character glyphs.
In addition, while a matrix of dots or pixels worked fairly well for languages such as English, written languages with complex glyph forms were poorly served by bitmap fonts.
Representation of bitmap fonts in source code
There are a number of bitmap font file formats which provide a way to represent a bitmap font in a device independent description. For an example see Wikipedia topic - Glyph Bitmap Distribution Format
The Glyph Bitmap Distribution Format (BDF) by Adobe is a file format for storing bitmap fonts. The content takes the form of a text file intended to be human- and computer-readable. BDF is typically used in Unix X Window environments. It has largely been replaced by the PCF font format which is somewhat more efficient, and by scalable fonts such as OpenType and TrueType fonts.
Other bitmap standards such as XBM, Wikipedia topic - X BitMap, or XPM, Wikipedia topic - X PixMap, are source code components that describe bitmaps however many of these are not meant for bitmap fonts specifically but rather other graphical images such as icons, cursors, etc.
As bitmap fonts are an older format many times bitmap fonts are wrapped within another font standard such as TrueType in order to be compatible with the standard font subsystems of modern operating systems such as Linux and Windows.
However embedded systems that are running on the bare metal or using an RTOS will normally need the raw bitmap character image data in the form similar to the XBM format. See Encyclopedia of Graphics File Formats which has this example:
Following is an example of a 16x16 bitmap stored using both its X10 and X11 variations. Note that each array contains exactly the same data, but is stored using different data word types:
QUESTION
I need to reduce the memory required by the KeDei TFT library used with the Osoyoo 3.5" TFT touch screen display shield for Arduino Uno and ATmega 2560. When I try writing a simple Arduino application that uses the TFT display with the KeDei library, most of the available memory on the Arduino is taken up by the library itself.
Unfortunately I have discovered that while an ATmega 2560 does have the necessary amount of memory, the KeDei TFT library does not provide correct touch coordinates when the TFT display is used with that device so the ATmega 2560 is not feasible unless Osoyoo customer support comes though with a solution.
Investigating the library source code, I found in the file KeDei_font.cpp a bitmap font table being used to generate the characters displayed. This bitmap font table is an array, unsigned char font16_B[96][16] and appears to be the main memory hog. This array contains bitmap fonts for the ASCII characters from the space character, 0x20, to the tilde character, 0x7e.
One thing that I have done is to reduce the number of characters by eliminating the lower case letters and transforming lower case letters to upper case. This results in a table const unsigned char font16_B[59][16] which is a bit more than half the size of the original table.
With this approach I also eliminate a few other punctuation type characters but as long as I'm displaying only alphanumeric characters and spaces, this will work.
...ANSWER
Answered 2021-May-05 at 20:16The first approach I looked into was to use some kind of compression on the bitmap font table such as run length encoding as so many entries were binary zero. I tested this approach and it did reduce the amount of memory while adding a bit of complexity. However the amount of memory saved was around 200 bytes with the simple approach I tested.
The second approach I looked at was reducing the size of the array by first eliminating the lower case letters and then by changing the bitmap font as well. Changing the bitmap font from a 16x16 size font to an 8x8 size font makes a significant difference in memory usage.
However changing the size of the table from const unsigned char font16_B[96][16] to const unsigned char font16_B[96][8] means that the characters displayed on the TFT screen will be smaller.
So there is a tradeoff between the amount of memory used and the character display size. Larger displayed characters requires more memory for the description of the glyphs.
A quick search for "8 bitmap font" finds this GitHub repository of Daniel Hepper, https://github.com/dhepper/font8x8, with an 8x8 size font and the license is Public Domain.
Using Preprocessor directives to select the font table to use and selecting a subsection of the file font8x8_basic.h from Hepper's GitHub repository, I added the following to the KeDei TFT library.
QUESTION
I'm very new to TFX, but have an apparently-working ML Pipeline which is to be used via BulkInferrer. That seems to produce output exclusively in Protobuf format, but since I'm running bulk inference I want to pipe the results to a database instead. (DB output seems like it should be the default for bulk inference, since both Bulk Inference & DB access take advantage of parallelization... but Protobuf is a per-record, serialized format.)
I assume I could use something like Parquet-Avro-Protobuf to do the conversion (though that's in Java and the rest of the pipeline's in Python), or I could write something myself to consume all the protobuf messages one-by-one, convert them into JSON, deserialize the JSON into a list of dicts, and load the dict into a Pandas DataFrame, or store it as a bunch of key-value pairs which I treat like a single-use DB... but that sounds like a lot of work and pain involving parallelization and optimization for a very common use case. The top-level Protobuf message definition is Tensorflow's PredictionLog.
This must be a common use case, because TensorFlowModelAnalytics functions like this one consume Pandas DataFrames. I'd rather be able to write directly to a DB (preferably Google BigQuery), or a Parquet file (since Parquet / Spark seems to parallelize better than Pandas), and again, those seem like they should be common use cases, but I haven't found any examples. Maybe I'm using the wrong search terms?
I also looked at the PredictExtractor, since "extracting predictions" sounds close to what I want... but the official documentation appears silent on how that class is supposed to be used. I thought TFTransformOutput sounded like a promising verb, but instead it's a noun.
I'm clearly missing something fundamental here. Is there a reason no one wants to store BulkInferrer results in a database? Is there a configuration option that allows me to write the results to a DB? Maybe I want to add a ParquetIO or BigQueryIO instance to the TFX pipeline? (TFX docs say it uses Beam "under the hood" but that doesn't say much about how I should use them together.) But the syntax in those documents looks sufficiently different from my TFX code that I'm not sure if they're compatible?
Help?
...ANSWER
Answered 2021-Jan-31 at 12:24(Copied from the related issue for greater visibility)
After some digging, here is an alternative approach, which assumes no knowledge of the feature_spec before-hand. Do the following:
- Set the
BulkInferrerto write tooutput_examplesrather thaninference_resultby adding a output_example_spec to the component construction. - Add a
StatisticsGenand aSchemaGencomponent in the main pipeline right after theBulkInferrerto generate a schema for the aforementionedoutput_examples - Use the artifacts from
SchemaGenandBulkInferrerto read the TFRecords and do whatever is neccessary.
QUESTION
I am studying the display device driver for linux that runs TFT display, now framebuffer stores all the data that is to be displayed.
Question: does display driver have equvalant buffer of its own to handle framebuffer from the kernel?
My concern is that the processor has to take the output from the GPU and produce a framebuffer to be sent out to the display driver, but depending on the display there might be some latencies and other issues so do display driver access framebuffer directly or it uses its own buffer as well?
...ANSWER
Answered 2021-Jan-05 at 13:34This is a rabbit-hole question; it seems simple on the surface, but a factual answer is bound to end up in fractal complexity.
It's literally impossible to give a generalized answer.
The cliff notes version is: GPUs have their own memory, which is directly visible to the CPU in the form of a memory mapping (you can query the actual range of physical addresses from e.g. /sys/class/drm/card0/device/resource). Somewhere in there, there's also the memory used for the display scanout buffer. When using GPU accelerated graphics, the GPU will write directly to those scanout buffers – possibly to memory that's on a different graphics card (that's how e.g. Hybrid graphics work).
My concern is that the processor has to take the output from the GPU and produce a framebuffer to be sent out to the display driver
Usually that's not the case. However even if there's a copy involved, these days bus bandwidths are large enough for that copy operation not to matter.
I am studying the display device driver for linux that runs TFT display
If this is a TFT display connected with SPI or an parallel bus made from GPIOs, then yes, there'll be some memory reserved for the image to reside on. Strictly speaking this can be in the RAM for the CPU, or in the VRAM of a GPU, if there is one. However as far as latencies go, the copy operations for scanout don't really matter these days.
20 years ago, yes, and even back then with clever scheduling you could avoid the latencies.
QUESTION
I am using yolov4 tiny on raspberry pi4 with 2GB module.
I install the almost all packages and activate the environment.install tensor-flow and tft-lite but when i execute the detection.py code i get the error.
Value Error: Didn't find op for builtin opcode 'RESIZE_BILINEAR' version '3' Registration failed.
i am using the code of "theAIGuysCode" ...
repo link = https://github.com/theAIGuysCode/yolov4-custom-functions
...ANSWER
Answered 2020-Dec-17 at 08:44Problem is mismatch of converter version and runtime version. Make sure you use recommended setup (tf 2.3.0):
Conda (Recommended)Tensorflow CPU conda env create -f conda-cpu.yml conda activate yolov4-cpu
Tensorflow GPU conda env create -f conda-gpu.yml conda activate yolov4-gpu
PipTensorFlow CPU pip install -r requirements.txt
TensorFlow GPU pip install -r requirements-gpu.txt
Check installed version (call print(tf.version) or check requirements.txt ) and install same version for your RPi.
QUESTION
I'm currently using a custom board that runs on an ATMEGA644P with an attach TFT display. I want to run two separate sketches on it, one of the sketch is complex open-source code that is written in C and the other is my own code that I have coded in Arduino. Combining the two is quite complex and time consuming as they don't run on the same core libraries.
My intention is to have two sketches in hex format uploaded to the board and have a selector switch that will boot into the correct sketch based on the state of the switch. I have research a few solutions but none seem to fit my need exactly, here are the solutions I have researched:
Solution 1Using AVRmultisketch by Jon Mackey.
This uses a custom app that compiles multiple ino files and a selector sketch where the selector sketch will set the starting address of the sketch in the memory. Main problem with this is one of my sketch is not available in ino format.
Solution 2Booting from SD card.
Since I have an SD card attached to the board, I was wondering if I can store both hex files in the SD card and either use a custom sketch or bootloader to select which sketch to use. Unfortunately, I can't find lots of documentation about this. Most methods show how to upload sketches from SD card directly without any selection process.
Are there any guides or methods I can use to achieve my goal?
...ANSWER
Answered 2020-Dec-01 at 18:34So I'm not sure if this is the only way or the best way but I manage to do this by using the avr_boot bootloader that will upload a sketch from the SD card on boot. I have successfully tested it with an arduino nano (ATMEGA328P).
Firstly, ensure the default files can be compiled. Then modify the Makefile according to the guide. The boot address can be calculated by multiplying the boot address by 2.For example boot address for ATMEGA328P where the high fuse bit is set to 0xD8 is 0x7000 . Also take note of the CS pin of the SD card.
Then modify the main.c file for line 39
QUESTION
I am currently displaying the data by calling the JSON file from Firebase Storage, but I want that instead of download JSON file every single time to show data => I will check if the JSON file from the Firebase Store has changed:
- If it changed => download the new JSON file to Local directory and display it.
- Otherwise => display the old JSON file in Local directory (This old JSON file will be downloaded when first time App open)
This is JSON link after I upload JSON to Firebase Storage:
As far as I know, this link is made up of 2 parts:
First part: https://firebasestorage.googleapis.com/v0/b/tft-test-48c87.appspot.com/o/loadData.json
Last part: ?alt=media&token= + 2e3d416-62dc-4137-93a3-59ade95ac38f (it is value of String: "downloadTokens" in First part)
In the First part of the link, there is all information about JSON file, and especially I think that value of String "updated" can be used as a condition for the purpose of downloading files or not.
Ex. "updated": "2020-08-04T14:30:10.920Z",
The value of this String updated will change every time I upload a new JSON file with the same name as the old JSON file but the link download will not change.
StepsSo I want to do the following:
- Create file to store String "updated" in Local directory (Ex. "updated": null) and where to store the JSON file after download to Local directory
- Open App
- Check String "updated" in link First Part:
Case A: if value of String "updated" in First Part
!=value of String "updated" in Local directory =>- Step 1: download JSON file (by link:
First part+?alt=media&token=+downloadTokens) to Local directory (If the old json file already exists, it will be replaced) - Step 2: overwrite value of String "updated" in Local directory by value of String "updated" in Firebase Storage
- Step 3: access JSON file in Local directory to display data
- Step 1: download JSON file (by link:
Case B: if value of String "updated" in First Part
==value of String "updated" in Local directory => do nothing, just access JSON file in Local directory to display data
I know this is a lot of questions for one post, I'm a newbie with code and if I split it up into a few posts then it is very difficult to combine them for me. So I hope the answer with full code, that would be great. Thanks. This is the main file:
...ANSWER
Answered 2020-Sep-16 at 06:02I would recommend using shared_preferences to save the last updated date as a String
QUESTION
I have a JSON like this (API):
...ANSWER
Answered 2020-Sep-14 at 10:00Does this help you?
QUESTION
and I have a list of element {{FieldName}}.
when I use this list inside an input it shows just the first Word not all text?
my code
...ANSWER
Answered 2020-Sep-14 at 07:59You need to put apostrophes around it, just like the other attributes, so instead of
QUESTION
I have a JSON file like this (API)
...ANSWER
Answered 2020-Sep-11 at 19:32In Dart, the List type has a sort function which lets you sort the list. You give the sort function another function that compares between any two objects in the list. It returns an integer that represents whether an object is less than, equal to or larger than the other object. If the returned value is -1 (might work for all negative numbers but I'm not sure), this means that the first object is less that the second object. If it's 0, they're equal, and if it's 1 (again, might work for all positives but not sure) the first object is larger than the second.
I assume your Sort class is defined as follows:
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Install TFT
PHP requires the Visual C runtime (CRT). The Microsoft Visual C++ Redistributable for Visual Studio 2019 is suitable for all these PHP versions, see visualstudio.microsoft.com. You MUST download the x86 CRT for PHP x86 builds and the x64 CRT for PHP x64 builds. The CRT installer supports the /quiet and /norestart command-line switches, so you can also script it.
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