Does anyone know the memory requirement for the Xively Embedded C library? RAM and Flash size?
I intend to use a low cost micro-controller with limited memory - 16KB flash and 1KB SDRAM.
Thanks!
You will need to compile the library for the taget chip first. The size of the binary depends on how efficient are the optimisations your compiler applies. When you do find out what the size is out of the box and in case you need to make it smaller and not too sure how, please do submit an issue ticket.
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I began programming the MCP5748G, the problem is that i'm working on an existing application and I'm adding a module that depends on other modules.
The module i'm developing is working well but when combined with the others modules both have to be modified. So for this purpose i'm doing a lot of debugging and re-programming of the flash memory.
Sometimes i could go up to 100 flash/erase cycles per day.
The developpement should take a while let's say 2 month and i don't know if the MCU can resist this period.
That's why i'm wondering for
What is the maximum of flash cycles for this MCU ? : the documentation is too long and i couldn't find the information on it.
And also i'm flashing and erasing just a specified blocks of the flash memory.The total flash is 5mb but i'm using 2mb only. I flash per blocks of 256kb , i want to know if flashing just a block affects the other blocks too and also if the performance of the flash memory is degrading after each erase/flash operation.
I know that every MCU support different flash cycles but if you have some infos on how to find the answer on the doc it would be very helpfull too.
Thanks
In my last question I asked whether there was a better way to rotate images than I had thought of. I ended up discovering jpegtran and have since found libjpeg-turbo.
Now I am looking for a better way to resize the images (jpegs) than imagemagick and graphicsmagick.
Is there a specialized commandline tool to resize the images in a more efficient way than imagemagick or graphicsmagick? Maybe the resizing can be done on the GPU using opencl or opengl?
The provided hardware is the same as in the other post:
Intel Atom D525 (1,8 Ghz)
Mobility Radeon HD 5430 Series
4 GB of RAM
SSD Vertility 3
Check this link out: http://leocharre.com/articles/faster-image-resizing-in-linux/
In particular the author mentions that imgresize is faster than imagemagick, and epeg is extremely fast.
epeg (http://www.systhread.net/texts/200507epeg1.php) seems quite well documented for generating thumbnails. If the quality is good enough, this could be the solution.
OpenCL is a standard for cross-platform, parallel programming of modern processors found in personal computers, servers and handheld/embedded devices. It's directly supported by ATI. You'll need to get AMD APP SDK (formerly known as AMD Stream SDK) to get GPU support (also check out this getting started guide).
Take a look at Intel's IPP - Integrated Performance Primitives. It's a multi-threaded software library of functions for multimedia and data processing applications. Among other features, it's has functions to resize images (bilinear, nearest neighbor, etc). Unfortunately, it is not free (cheapest version costs $199).
VIPS is a free image processing system. It claims that compared to most image processing libraries, VIPS needs little memory and runs quickly, especially on machines with more than one CPU. See the Speed and Memory Use page for a simple benchmark against other similar systems.
You can actually do a lot of bulk processing like this with GIMP's CLI options.
http://www.gimp.org/tutorials/Basic_Batch/
There is also djpeg and cjpeg from the Independent JPEG Group which can rescale and image to an M/N fraction. Not perfect but very fast.
Simply use FFMpeg.exe. It can resize , convert , change quality and so on.
And also it works with almost all known types of videos/audios/pictures.
It works in linux/unix too, and there is open source code for it written in C++.
You can get it Here (for Windows/compiled exe) or Here (source code and so on).
If you are developing a program, I recomend you to use standard GDIPlus library.
It does everything with pictures.
This videocard (Radeon HD 4850) conforms only with OpenCL 1.0, per AMD Compatibility table. I need some hardware to conduct intensive financial calculations with doubleN types (no floats at all!). According to this cardtable, this card is able to work with double types. Now I have the possibility to buy it at quite an attractive price.
I'd greatly appreciate if an answerer has real experience in working with this card for OpenCL with fp64 extension. Of course, if there are problems with this card, please put two lines here.
Thank you and sorry for my English.
I haven't used this card with DP before, but if the spec says it is supported, then it's worth a try.
In my opinion, you should go with a newer model card though. There are a lot of cheap cards out that will outperform the 4850, and they will support some new features as well.
This card supports double precision but the 4xxx series doesn't include local memory in the chip. As the standard mandates local memory support it is emulated with global memory and very slow. Many algorithms require local memory for obtaining a good speed-up. So, a newer card 5xxx and higher is a lot better.
In addition, some combinations of older cards/older SDK versions only support double precision through the cl_amd_fp64 extension (not the official cl_khr_fp64 extension) because of some small things from the standard that are not supported. For the most part, this doesn't matter much except that you need to change the extension name in your code to make it work with doubles.
As a general tip, I would try to avoid the 4xxx series if you intend to make serious GPGPU development. Keep in mind also, that the newer 7xxx series it is much more optimized for GPU computations than both the 5xxx and 6xxx series closing much of the gap with NVIDIA cards. So, if you can, try to aim for a 7xxx with double precision support.
Well i am not asking about the tool to compress or measure the size of swf file , i need a tool that can show me how many bytes or mbs, my swf is using ??
You mean a profiler, and yes there are a few options.
First I would recommend using FlashDevelop to er... develop your Flash software. It has a great profiler that can show you memory usage over time and also give you a live rundown one how much memory each object is using and how many of an object type exists (great for finding memory leaks).
There is also De Monster Debugger. For a great video tutorial that covers the basics see Lee Brimelow's - Debugging with MonsterDebugger.
I would like to solder a microcontroller, control buttons and an DVI/HDMI output and program this in a way, that I can store images on it and let them display as a dia-show via the outputs.
It doesn't have to have a lot of storage capacity, 128Mb would be enough.
but I don't know how to start, because I haven't done anything like this before.
My aim is to present some important images to friends by just taking this hardware, connecting it to a TV screen and showing these photos. If should be able to switch the photos manually (using a button) or automatically in a dia-show.
It should support several TV resolutions and it should be connectable to my PC (USB prefered), so that I can upload and delete photos.
So where to start and how to do that?
Thank you in advance, Andreas
If your aim is just to show some photos, there are assuredly simpler and more cost effective ways to do so; devices exist which do more or less exactly what you are proposing.
If your aim is to learn about microcontrollers and this is a project your are taking up to further that, I would recommend looking into the Arduino: http://www.arduino.cc/ or a similar kit based micro, and growing your project from that.
Microcontroller + low level language will be a huge pain to work with, particularly if you wish to handle various file formats and screen resolutions. Get a full-blown computer with an OS instead - something like http://en.wikipedia.org/wiki/PC/104
If your goal is purely to be able to display photos then I would recommend using a digital camera with video out capabilities.
If your aim is to learn about electronics and microcontrollers I would start with a good book and an Arduino board. Note that writing microcontroller code to handle file systems, image formats and video output is non-trivial. Simpler projects may be a better starting point as they are more accessible resulting in quicker progress, less frustration and more motivation!
The engineering field is a interesting field. You can start with the web site "www.microchip.com". You will need a high end device consider the PIC32MX795L512, there is a nice starter kit for it, "Ethernet Starter Kit" http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2615&dDocName=en545713. This kit has the on board debugger & programmer to do all the hard work.
You get sample projects with the package, you can program using ansi c programming.
IDE : MPLAB which is free, and the C32 compiler has a student/lite version.
Arduino also has a board with the same device.
I personally like "www.techtoys.com.hk", they have device compatible with Microchip boards like techtoys.com.hk/PIC_boards/PIC32STK%20SSD1963%20EVK/PIC32STK%20SSD1963%20EVK%20R1A.htm, or this techtoys.com.hk/PIC_boards/PIC2432EVK-RD4/PIC2432%20EVK%20RD4.htm where this board you will need a debugger/programmer like the low cost PIC Kit 3 "microchip.com/pickit3".
The trouble is you need to write the HDMI video library yourself, there are some VGA libraries available but they are only black and white and very hard to get color with these analog images. The rest of the libraries are already there, USB MSD(flash drive), SD Card, pictures (jpg) etc.
microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=2680&dDocName=en547784
Feel free to contact me if you need some help, I might be able to help with the HDMI library.
It's a lot of fun to play with these toys.
Regards
Lucas
B-Eng Digital Engineering.
imlucanio#yahoo.com (no spamming)
Remember to add the http and www to the web links.
It sounds like you want an iPod. That is a dead simple thing to work with and it does everything you want. Otherwise, very complicated. I'd suggest the BeagleBoard and embedded Linux. Yes, it warrants that level of complexity.
The options for small microcontrollers just aren't there. The Arduino is very popular and yes, you can interface an SD card to it. That'd be your storage. Yes, you can put a digital potentiometer on it, that can be your interface. I've seen some video overlays that do simple text, but never any JPEG display (too much processing required). And certainly no 24 bit color (so that the output would actually look good) - that would take WAY too many pins to do correctly (and the Arduino doesn't have a D/A converter! You'd have to rig something up that would suck). And even then, all of the options for TV out weren't HDMI, but RCA (the old red/white/yellow cables).
So in short, no. Get a computer. That's what can do the job.