Embedded / RTOS Forum RSS Feed (Replies Included)

how to capture and store the serial data in buffer

Tue, 18 Jun 2013 02:45:31 -0700

I sent 1preample and 4bytes in transmitting side , preample contains only 1 and 0 with 4milliseconds delay, each byte contains 8bits with 2milliseconds delay , if a bit contains 1 it will send 1millisecond high and 1millisecond low signal ,and if a bit contains 0 it will send 2millisecond continuous delay, I have a problem at receiving side how to capture and store the preample and 4byte values in a buffer , iam using ARM processor it will update every 5microsecond .. please guide me and give a valuable suggestions

thanks in advance

how to capture and store the serial data in buffer

Tue, 18 Jun 2013 02:43:40 -0700

learning the ARM CORTEX M3

Sun, 16 Jun 2013 17:38:02 -0700

suppose that I wanted to learn the ARM CORTEX M3 programming in detail... is using development boards is the right answer? something like Arduino Due or mbed NXP LPC1768 board (http://www.pololu.com/catalog/product/2150)??

this is because I really would like to go deeper into ARM technology. any thoughts are welcome.

learning the ARM CORTEX M3

Sun, 16 Jun 2013 17:36:11 -0700

firmware license

Tue, 26 Feb 2013 03:42:59 -0700

Hi,

I am planning to convert my firmware which runs on my device into a commercial library which is to be ported to my customer's firmware and device. However, I am concerning about security issues. Is there any way to prevent reverse engineering on my firmware library and protect my IP. What kind of agreement should I make with the customer? Should I get a license fee per copy or should it be royality free?
Please advise.
Many thanks

Design of a logging system : which filesystem to use ?

Fri, 25 Jan 2013 02:20:17 -0700

Hello everyone,

I am designing an embedded system whom goal is to log sensors state continuously and that can be powered off at any time.

For specific reasons, I have currently to use Windows XP, and a Compact Flash storage media. Firsts prototypes use this configuration :
* 1rst partition readonly for the system (NTFS),
* 2nd partition for data logging (NTFS).
First tests are not so bad, but I am not fully satisfied of this solution (time to time filesystem or Compact flash is dead).

Do you have advices about a way to improve the solution that I am validating ? Which filesystem to use for a flash storage media ?
Which solution would you use (HW is x86) if Windows XP and a compact flash were not a constraint (which storage media, which filesystem, which os configuration, etc.) ?

Thank you for your advices

Compilation of Proprietory application for running on Vxworks

Mon, 17 Dec 2012 23:35:08 -0700

Hi,

We are migrating out system from x86 processors to Arm9. There is one proprietary application which is currently in ELF format and is compiled by end customers using Open watcom. When we are using Vxworks and Arm9 I need some cross compiler which is generate ELF file for Arm9 and can be used by end customer for compiling the user logic. This should be freely available.

Regards,

Yogesh

Re: Embedded software design

Wed, 07 Nov 2012 02:09:21 -0700

embedded-processor architecture designed specifically for the Altera family of FPGA s. computing applications, from DSP to system-control.
http://www.automateandvalidate.com

Re: UML State Machine Wizard Re: Cross Devlop in VC++

Wed, 17 Oct 2012 15:58:12 -0700

Stateflow is another environment for modeling and simulating combinatorial and sequential decision logic based on state machines and flow charts. Stateflow lets you combine graphical and tabular representations, including state transition diagrams, flow charts, state transition tables, and truth tables, to model how your system reacts to events, time-based conditions, and external input signals.

MT8572-N PowerPC development platform for network communication

Wed, 23 May 2012 19:45:35 -0700

The MT8572-N PowerPC platform is a high performance development board released by MICETEK, based on the PowerQUICC III processor with dual cores, works at up to 1.5GHz. It consists of MPC8572 processor card and Type-N carrier and provides multiple high speed connectivity, such as Gigabit Ethernet port, PCI-Express and USB 2.0 port etc and helps the network equipment manufacturers simplify the system design and establish the Intelligent Network application. In addition, we’ll supply Linux BSP for the developer, including U-boot, Linux Kernel and driver codes of the interfaces on the board to help the design and development easier.

Form Factor: 8.7 inches x 5.8 inches
Interfaces: 4 x GbE connections, 3 x PCI slots, 1 x PCI-Express x 8 and 1 x RS-232 serial port
Debug: JTAG/COP via an onboard connector
Software: U-Boot bootloader and Linux BSP available

For more information, please feel free to contact me via xuyn@micetek.com.cn or visit our website www.micetek.com

MT8572-N PowerPC development platform for network communication

Wed, 23 May 2012 19:43:45 -0700

VxWorks PCI Card

Fri, 30 Mar 2012 09:11:28 -0700

Hello All

I know nothing of VxWorks so please excuses my ignorance,

We have a couple of servers that run a proprietary application which is built on vxworks. these servers are standard x86 intel chassis with some kind of PCI card which the vendor is offering to sell.

THe vendor provides some installation instructions that invole booting the server and then running a tool which sends a broadcast packet with the configuration. I can see the firmware it loads are VDF files from another server in the network.

1. What type of PCI card would this be?

2. Is it possible to copy the content of the vxworks to another PCI card?

3. Is it possible to load the operating system with application into some kind of emulator?

Thanks
James

Integrity RTOS issue

Tue, 28 Feb 2012 04:15:22 -0700

Hi,

We are using MPC8309 Power PC processor of freescale with Integrity RTOS build on it.
We have connected a External DDRAM to CPU and want to write POST(Power On Self Test) routine for DDR RAM where we will be testing large section of DDR RAM.

Since code consists of RTOS and many background tasks running into it, i am not sure about what approach should be followed ?
Will i have to disable interrupts ?
Or what approches should be followed in software ?

Can anybody help me on this ?

Integrity RTOS issue

Tue, 28 Feb 2012 04:13:31 -0700

Coding in C++ for MISR(multiple input shift registers)

Sat, 18 Feb 2012 06:17:54 -0700

hi,
I want to do coding in c++ for multiple input shift register(MISR). I have some idea regarding this but dont know how to start
with it and the misr is used in built in self test circuits.
Could anyone please help me in this.

Coding in C++ for MISR(multiple input shift registers)

Sat, 18 Feb 2012 06:16:03 -0700

Re: RTEMS or general RTOS question

Tue, 14 Feb 2012 18:38:32 -0700

I don't know anything specifically about RTEMS, but I would be shocked if they don't have separate stacks for each thread.

Each thread pushes parameters on its own stack and calls the function. Then the function adjusts the stack pointer to take as much space as it needs for its local variables.

A task switch stores all registers, including the stack pointer, in the task structure for the task that's being suspended and loads them from the structure for the task being activated.

There's only one copy of the code, but multiple stacks.

What would best replace QNX4?

Mon, 13 Feb 2012 19:34:21 -0700

We have a large application that runs under QNX4 on an x86 board and I'm looking for a way to propose a replacement. The decision has already been made to not upgrade to the latest QNX.

What I'm thinking of is some GPL/BSD/MIT licensed OS that could be enhanced to allow our product to compile and run almost unmodified.

Specifically, I need independent processes (not just tasks), network, filesystem (that ideally could access the existing QNX filesystem), /dev/mqueue/ for interprocess communications and a shell (no graphics). We don't strictly need a realtime OS, as long as performance is good.

Is this big and daunting, or is there something that almost fits?

Any suggestions?

RTEMS or general RTOS question

Sun, 12 Feb 2012 11:08:56 -0700

Hello,

I am developing an application for RTEMS that involves two running tasks. Both tasks call at some point the same global function called function1.
Let's say task T1 calls function1 and the context switch to T2 occurs before exiting function1. Task T2 also calls function1.
My question is what happens to the local variables of function1? ... is there a copy of function1 for each task ?

Thanks

RTEMS or general RTOS question

Sun, 12 Feb 2012 11:06:36 -0700

Embedded Engineering Institute

Tue, 17 Jan 2012 02:23:25 -0700

Hello Friends, find best [url=http://www.emblogic.org/training-embedded-engg.php]Embedded Engineering[/url] institute:-

Embedded system software used in computer, embedded software play electronics role in the computer for taking technical training of embedded system software at the emblogic and be the master of this field.

Re: Interrupt latency

Mon, 31 Oct 2011 00:58:41 -0700

The time between the interrupt generated from a device and execution of first statement in associated ISR.
Optimize ????

Re: Interrupt latency

Mon, 31 Oct 2011 00:56:44 -0700

The time between the interrupt generated from a device and execution of first statement in associated ISR.
Optimize ????

Re: Interrupt latency

Mon, 31 Oct 2011 00:54:55 -0700

The time between the interrupt generated from a device and execution of first statement in associated ISR.
Optimize ????

Does vxWorks 5.4.2 support %llu printf format?

Thu, 13 Oct 2011 13:43:50 -0700

I'm trying to use the %llu format to print out a 64 bit number but only the lower 32 bits are displayed. Does anyone know if vxWorks 5.4.2 supports %llu or if there's something I'm missing to print out the 64 bit number?

Thanks