Embedded / RTOS Forum RSS Feed

Virtual memeory concepts in embedded systems.

Thu, 02 Jul 2009 05:04:07 -0700

Hi,

Can any send me any documents on this.
Thanks

Virtual memeory concepts in embedded systems.

Thu, 02 Jul 2009 05:02:59 -0700

Hi,

Can any send me any documents on this.
Thanks

about RTOS and task stack

Wed, 01 Jul 2009 22:31:22 -0700

Can i put the task stacks into the external space of 8051 MCU?!
And i cant' understand the concept of task stack?!
Thanks!

about task stack and RTOS

Wed, 01 Jul 2009 22:30:31 -0700

Can i put the task stacks into the external space of 8051 MCU?!
And i cant' understand the concept of task stack?!
Thanks!

about task stack and RTOS

Wed, 01 Jul 2009 22:29:25 -0700

Can i put the task stacks into the external space of 8051 MCU?!
And i cant' understand the concept of task stack?!
Thanks!

A new Emulator for ARM Cortex-M3 processor

Sat, 27 Jun 2009 00:07:28 -0700

Recently, I happened to find a kind of smart and inexpensive Emulator which may be helpful for your project development. The relevent description is as blow:
Emlink for ARM is a new-generation high-speed real time JTAG adapter, debugs the ARM Cortex-M3 processors through Realview MDK or EWARM. Emlink connects the JTAG interface from target board (ARM processors) to PC USB port, supports source level debugging and Flash programming.
Emlink allows you to:

Download programs to memory.

Examine memory and registers.

Single-step execute in the source level.

Insert multiple breakpoints.

Run programs in real-time.

Program into on-board Flash.

I hope this information can be useful for you. Oh, for more details on this Emulator please visit http://www.embedinfo.com/en/index.asp
http://www.embedinfo.com/en/list.asp?id=42

Attachment: emlink-for-arm.jpg (27952 bytes | downloaded 4 times)

embeded development tools

Sat, 27 Jun 2009 00:02:27 -0700

Hi all, here are two high performance ARM Cortex-M3 Core based development boards that I want to recommand. One is NXP LPC1766 ARM-CM3 Board, the other is STM32F103ZE ARM-CM3 Board。
The LPC1766 evaluation board is based on ARM Cortex-M3 processor from NXP, its operating frequency is up to 100MHz, with 256KB high-speed on-Chip Flash Memory and 64KB RAM, together with a colour QVGA LCD, Ethernet, USB, CAN, SD/MMC card interface, and UARTs.
The STM32F103ZE is a high performance evaluation board produced by Embest for S TMicroelectronic ARM Cortex-M3 core-based processors, operating at a 72 MHz frequency with Flash memory up to 512Kbytes and SRAM up to 64 Kbytes. The board features USB, CAN, SD Card interface, 20-pin JTAG interface, TFT-LCD interface, two RS232 serial interface, four 26-pin user extended interface, etc. Plenty of software examples, which can be used in Keil MDK environment, are provided with this STM32F103 board.
For more information about these two ARM board, please feel free to contact us: http://www.embedinfo.com/en/index.asp.Thank you very much for your time.

Attachment: F103ZE.jpg (41958 bytes | downloaded 5 times)

Porting Threadx on 32-bit Windows

Tue, 23 Jun 2009 23:41:13 -0700

Hi,

I have an application using ThreadX 3.x as the kernel.
The Image is flashed on to a hardware running an ARM 9 processor.

I'm trying to build a Simulator for the application that can be run on Windows (say XP, 32-bit).

Is there any way I can make it run on Windows, without modifying the entire source code to start calling win32 system calls?

Any help in this matter is much appreciated. Thanks in advance

difference b/w binary semaphore and mutex

Mon, 22 Jun 2009 22:45:13 -0700

Hi,

What is the difference b/w binary semaphore and mutex?....

a source example will help me clear the doubt.

Thanks
With regards,
Anoop

Which base version of ARM is supported by Embedded Linux ?

Tue, 16 Jun 2009 03:11:45 -0700

As per my informations,
RTLinux comes with support to ARM architecture from version 9, ARM9 and above.
It requires new design to support ARMV4.

Still I look for some option in Embedded Linux.

Can anyone please help me - Which base version of ARM is supported by Embedded Linux ?

I mean the support for that ARM version exist currently and it will not require totally new design for the port ?

Is it possible with ARM version 4 ?

Your help is greatly appreciated.
Regds.

Bluetooth Server program in Embedded C

Mon, 15 Jun 2009 01:29:53 -0700

Hi all

My application is
A Microcontroller with Bluetooth (server) should interact with Mobile which has bluetooth device(client). Its like a Chating Application.

Can anyone tell,
I am using Keil C51 compiler.Does it supports bluetooth stack. If yes
how to do Bluetooth Server prgramming in Embedded C. If No which compiler I have to use for the Embedded Design.

I have planned to do this by using socket programming.

Please give me your valuable suggestion.

Kindly assist me.

Thanks
Veena

Does RTLinux support ARM processor - ARMV4I

Mon, 15 Jun 2009 01:04:53 -0700

Can anyone tell me -
Does RTLinux support ARM processor - specifically "ARMV4I" ?

Where can I get info regarding RTLinux for ARMV4I ?

Please reply.

wind river vxworks workbench installation error

Fri, 12 Jun 2009 13:28:29 -0700

when i try to install wind river workbench i get this error
what should i do??

!SESSION Fri Jun 12 18:22:02 GMT 2009 ------------------------------------------
!ENTRY org.eclipse.core.launcher 4 0 2009-06-12 18:22:02.745
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.RuntimeException: Could not find framework
at org.eclipse.core.launcher.Main.getBootPath(Main.ja va:639)
at org.eclipse.core.launcher.Main.basicRun(Main.java: 274)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

thnx in advance

Need RTOS tutorial..

Thu, 28 May 2009 03:15:16 -0700

Hi experts,

I am a beginner. I need a good tutorial for RTOS. Please guide me..

Memory matters

Mon, 18 May 2009 08:23:27 -0700

Hi all,

I have a question...

Why is it good to sucrifice some runtime memory to get a smaller static footprint (size of binaries) ?

info on PS3 operating system

Sat, 16 May 2009 18:05:37 -0700

Hello, can anyone give me some info on PS3 operating system ( often called system software), the more details the better. Or some links to PS3 OS review text. Any info will help...

Error while launching the rtp application in vxworks6.6

Sat, 09 May 2009 10:36:37 -0700

Hi,

I have problem launching the Rtp application helloworld.vxe.
My helloworld application has the following code.
#include <stdio.h>
#include <stdlib.h>
#include <vxworks.h>
#include <taskLib.h>
#include <sys/stat.h>
#include <lstLib.h>
/************************************************* ******************************
* main - User application entry function
*
* This routine is the entry point for user application. A real time process
* is created with first task starting at this entry point.
* This function writes 'Hello World' on the console and exits.
*
*/

int main
(
int argc, /* number of arguments */
char * argv[], /* array of arguments */
char * envp[], /* array of environment strings */
void * auxp /* implementation specific auxiliary vector */
)
{

printf ("Hello World\r\n");
return 0;
}

when i try to run the helloworld.vxe file from the vxworks prompt, i get the following error message.
-> rtpSp "/romfs/helloworld.vxe",60,0x10000,0,0
value = -1572356448 = 0xa247bea0
-> 0xa0934010 (iHelloworld): RTP 0xa247bea0 has been deleted due to signal 4.

and if i dont run the above command and if i enter the following commands, it seems that helloworld has launched but i am not able to get print.
-> cmd

[vxWorks *]# rtp exec -c /romfs/helloworld.vxe 2 &
when i give the above command, i get the following message.
Launching process '/romfs/helloworld.vxe' ...
Process '/romfs/helloworld.vxe' (process Id = 0xa0923388) launched.
Attachment number for process '/romfs/helloworld.vxe' is %1.
[vxWorks *]#
Branch through zero
Current Processor Status Register: 0x60000053
Task: 0xa0924454 "iHelloworld"
0xa0924454 (iHelloworld): task 0xa0924454 has had a failure and has been stopped
.
0xa0924454 (iHelloworld): fatal exception in a kernel task or stack overflow !

and also i am able to go inside helloworld application by following command.
[vxWorks *]# %1
[helloworld]# This will be displayed.

I am able to set the break points too as shown below.
[helloworld]# bp &main
[helloworld]# bp
# Breakpoint Address Ctx Ctx Id Cnt Stops N Hard
--- ----------------------------- ----- ---------- --- ------- - ------------
0 0x00100328: main RTP 0xa0923388 0 task y

when i disassemble the helloworld.vxe application, i get the following instruction.
[helloworld]# l 0x00100328
main:
00100328 e52de004 STR r14,[r13,#-4]!
0010032c e59f0008 LDR r0,0x0010033c
00100330 eb0007ae BL printf
00100334 e3a00000 MOV r0,#0
00100338 e49df004 LDR pc,[r13],#4
0010033c 0010dfc8 ANDEQS r13,r0,r8,ASR #31
memAddToPool:
00100340 e1a02001 MOV r2,r1
00100344 e1a01000 MOV r1,r0
00100348 e59f03b8 LDR r0,0x00100708
0010034c e5100000 LDR r0,[r0,#-0]

but its not displaying the prints..
and also if i enter "shl" command here, its not displaying any shared library...
[helloworld]# shl

SHL NAME ID TEXT ADDR TEXT SIZE DATA SIZE REF CNT
-------------------- ---------- ---------- ---------- ---------- -------
[helloworld]#
Should i include any shared library???
i have included the following macros in the config.h....
#define INCLUDE_RTP
#define INCLUDE_RTP_APPL_USR
#define INCLUDE_RTP_APPL_INIT_STRING
#define INCLUDE_RTP_APPL_INIT_BOOTLINE
#define INCLUDE_RTP_APPL_INIT_CMD_SHELL_SCRIPT
#define INCLUDE_SHARED_DATA
#define INCLUDE_SHL
#define INCLUDE_RTP_HOOKS
#undef INCLUDE_VX_TRADITIONAL_SCHEDULER
#define INCLUDE_POSIX_PTHREAD_SCHEDULER
#define INCLUDE_POSIX_CLOCK
#define INCLUDE_SHELL
#define INCLUDE_DISK_UTIL
#define INCLUDE_RTP_SHOW
#define BUNDLE_RTP_DEVELOP
#define BUNDLE_RTP_POSIX_PSE52
#define BUNDLE
#define INCLUDE_SC_POSIX
#define INCLUDE_SHOW_ROUTINES
#define INCLUDE_PROTECT_TASK_STACK
#define INCLUDE_EDR_PM /* ED&R persistent memory */
#define INCLUDE_EDR_ERRLOG /* ED&R error log */
#define INCLUDE_EDR_SHOW /* ED&R show routines */
#define INCLUDE_EDR_SYSDBG_FLAG /* ED&R debug flag */
#define INCLUDE_RTP_SHOW_SHELL_CMD
#define INCLUDE_ADR_SPACE_SHOW
#define INCLUDE_ADR_SPACE_SHELL_CMD
#define INCLUDE_VM_SHOW
#define INCLUDE_VM_SHOW_SHELL_CMD
#define INCLUDE_LOCK_TEXT_SECTION

Do i have to include any additional macros to support RTP??

Please help me out to solve this issue as soon as possible.

Thanks in Advance,
Supreet

TimerB

Mon, 04 May 2009 08:00:36 -0700

Hallo,

I am writing IAR PowerPac RTOS for MSP430 family and I am using MSP430F1611 microcontroller. The C code developer has used both the timers A&B in his code but in my analysis I have found that Timer B register values does not change through out the code. Since I need a Hardware timer tick for interrupts I decided to use the same timerB for hardware tick with same frequency as my friend has used for other ADC conversions. I would like to know how can I make this tick to other values with pout changong the actual register values.

Here is the code for tick and its tick handler:

I would like to know how can I use the TimerB in such a way that the
register value TBCCRO must not change but it should rather make a tick
approximately every 1ms. As the programmer has already used this timerA and
TimerB in his programe and I have found that TimerB is the only option for
me to use as TimerB tick as its register values are not changing through out
the code.

#define OS_FSYS 3000000

void OS_InitHW(void){
WDTCTL = WDTPW + WDTHOLD; /* Stop watchdog timer */
TBCTL = OUTMOD_4 /*Reset Timer_B7, division 1*/
| (1 << 2) /* Clear timer*/
| (1 << 9); /* Use ACLK as timer clock */
TBCCR0 = (OS_FSYS / 375); /* approx 0.125ms */

TBCCTL0 = 0 /* Initilize capture control */
| (1 << 4); /* Enable compare interrupt */
TBCTL |= (1 << 4); /* Start timer in UP-Mode */
OS_COM_Init(); /* Initialize UART */
}

#pragma vector=TIMERB0_VECTOR // Sandhi
static __interrupt void ISR_TimerB(void)
{
OS_EnterInterrupt();
OS_HandleTick();
OS_LeaveInterrupt();
}

To be more clear I want to make Tick every 1ms with out changing
the Registers value in above program? Kindly give me a solution for this.
According to the above code Tick is made for every 0.125ms
(Since OS_FSYS /375=8000 that means 1/8000=0.125ms every tick)

MSP430F1611 slau is also attached for referance.

With regards,
Prashant Kumar Sandhi.

task scheduler for adaptive real time system

Wed, 01 Apr 2009 03:15:04 -0700

Hi friends please send the scheduling algorithm EDF, Rate Monotonic, RR, FCFS etc source code.
Thank you

Prolog/epilog

Sat, 07 Mar 2009 11:21:02 -0700

what is prolog and epilog
what is its importance in coding

RTOS

Sat, 07 Mar 2009 11:19:15 -0700

Please help to write my own scheduler(preemptive) for Atmega128
which is having 4K RAM and 128K flash

or

how to write a scheduler(preemptive) for 0x386 micrprocessor

VXWorks Question

Fri, 06 Mar 2009 09:41:25 -0700

I am debugging an IC that has is running VxWorks. Using the lkup command, I am able to find some functions that I would like to run.

An example is:

SomeClass::SomeTest(var1,var2)

I am unable to run the SomeTest.

Does anyone know how to start this SomeTest?

Thanks,
Paul

Designing a real-time scheduler simulator

Thu, 05 Mar 2009 04:19:09 -0700

Hi,
I'm siva. I need help in implementing a real-time scheduler simulator. I am trying to implement this simulator in LabVIEW 8.5. Also I need to implement a task scheduler co-processor in fpga. Please help me.

With regards
Siva

Porting and Migrating to new RTOS

Tue, 03 Mar 2009 00:25:25 -0700

It is not easy for developers to adapt existing software to a new OS or enable it to support multiple operating systems without incurring high costs and increasing time to market entry.

MapuSoft Technologies(MT) offers OS PAL, OS Abstractor, and OS Changer products to help developers streamline development processes and re-use their embedded software on one or more operating systems.

VxWorks, pSOS, Linux, Lynx OS, Solaris, UNIX, eCOS, Windows, Nucleus, ThreadX, MQX, QNX, uITRON or T-Kernel?. Please look at our solutions to make this transition Painless AND Affordable. We don't charge royalty.

www.mapusoft.com
maniraj@mapusoft.com
91-9940636800

RTOS Selection

Tue, 03 Feb 2009 17:20:56 -0700

Hi,

I want to select the RTOS for my product which has Ethernet,USB Device & Host, Access Card, RS485, CAN, TFT LCD, Touchscreen and other peripherals.

I want to select the RTOS for my Product.

What all parameters i have to consider for selecting the RTOS?