FYI: Nutxx - BSD licensed RTOS

Started by Marco in comp.arch.embedded10 years ago 4 replies

Open source BSD licensed RTOS see http://nuttx.sourceforge.net/ http://tech.groups.yahoo.com/group/nuttx/

Open source BSD licensed RTOS see http://nuttx.sourceforge.net/ http://tech.groups.yahoo.com/group/nuttx/


Implementing a Counting Semaphore for RTOS

Started by ssubbarayan in comp.arch.embedded14 years ago 11 replies

Gurus, For reasons undisclosed,We are asked by our clients to design a counting semaphore for their propreitory RTOS.I have some...

Gurus, For reasons undisclosed,We are asked by our clients to design a counting semaphore for their propreitory RTOS.I have some ideas presented here,I would like to know all your expert opinion whether this could be a proper design to go ahead and implement.I have few hiccups which till now I am not clear how to overcome.Heres what I planned to proceed like: The actual expectation ...


RTOS question

Started by Uddo Graaf in comp.arch.embedded16 years ago 6 replies

I heard that a RTOS always responds to an interrupt within a certain time, i.e. the response time is predictable. However, what happens when...

I heard that a RTOS always responds to an interrupt within a certain time, i.e. the response time is predictable. However, what happens when the interrupt or alarm is being handled and within that same time another time critical alarm goes off? I assume it is simply flagged or an exception is triggered which sounds a siren or something because it can't preempt the currennt handler


RTOS market

Started by Josias R. P. Langoni in comp.arch.embedded15 years ago 3 replies

Hi. Does anybody have recent numbers on the current marked share of the main RTOS players? I see claims from some manufacturers or even in...

Hi. Does anybody have recent numbers on the current marked share of the main RTOS players? I see claims from some manufacturers or even in some articles around the internet but I would like to have the research data that support them. Pointers to recent market share research (not necessarily free as in gratis) are also welcome. Thank you in advance. Josias.


What is the sense of a RTOS on a single-chip microcontroller?

Started by Paul Rosen in comp.arch.embedded12 years ago 5 replies

Hello, I do not have a idea, where a RTOS on a singlechip microcontroller is good for. I know, that it is good for making two (or more)...

Hello, I do not have a idea, where a RTOS on a singlechip microcontroller is good for. I know, that it is good for making two (or more) processes parallel but cannot imagine, how this works. O.K, a simple example to make it clear. There is microcontroller and two processes shall run on it. The first one ANDs two intput-pins and gives the result to an output-pin. The second one ORs two othe...


VANT processor/RTOS choice. Need sugestions

Started by Sink0 in comp.arch.embedded8 years ago 8 replies

Hi, i am starting entering on the fixed wing VANT reasearch field, and i was browsing the options for the control system architecture. I could...

Hi, i am starting entering on the fixed wing VANT reasearch field, and i was browsing the options for the control system architecture. I could find two possible ways i could go. A TMS570 microcontroller + Some safe RTOS (SafeRTOS, =ECC/OS-II...), or a PC104 (with non defined processor architecture) + QNX. In most of the cases the last is the one that got much more horsepower, but still is he...


I/O latency for systems not using a RTOS

Started by Bruce Varley in comp.arch.embedded8 years ago 12 replies

I've been implementing custom devices for stage music use for several years, using small SBCs that run a basic RTOS that I code up myself. The...

I've been implementing custom devices for stage music use for several years, using small SBCs that run a basic RTOS that I code up myself. The input and output is MIDI, coded music tokens (not digitised audio) at a serial data rate of 31.25 KB. Even with the maximum amount of processing involved, latency time between receipt of a byte and its associated transmission was never more than ...


Seeking comparisson of free RTOS for embedded

Started by Baron Samedi in comp.arch.embedded10 years ago 4 replies

Sorry if this is a FAQ, I have googled around and don''t find much. What to I want from an RTOS? - The standard message/timer/mutex/thread...

Sorry if this is a FAQ, I have googled around and don''t find much. What to I want from an RTOS? - The standard message/timer/mutex/thread stuff - Some sort of abstraction layer, so that I can unit test my code under Linux or Windows before hitting the hardware - Support for a bunch of processors - Easily configurable - Good documentation & support forums - in fact anything that lets m...


Need RTOS & SSH for ARM-based remote terminal

Started by Sean_Q_ in comp.arch.embedded11 years ago 1 reply

Processor is Atmel AT91SAM7XC256 connected by GSM modem. The client has specified "encryption". I think it needs a formal RTOS and Secure...

Processor is Atmel AT91SAM7XC256 connected by GSM modem. The client has specified "encryption". I think it needs a formal RTOS and Secure Shell; client says "get it working ASAP first and we'll add encryption later." Any recommendations? btw the eCosPro SSH middleware seems to be server only, not client. TIA, Sean_Q_


rtos features

Started by Sagar in comp.arch.embedded15 years ago 21 replies

hello, i am evaluating various rtos for on of our products based on arm7. i have been looking at Nucleus, embOS, Rtxc, Threadx and MicroC...

hello, i am evaluating various rtos for on of our products based on arm7. i have been looking at Nucleus, embOS, Rtxc, Threadx and MicroC os-ii. Of the lot Threadx and embOS seem to be good. Although i believe that the others are just as good. It seems hard to zero in one choice. I have been searching for reviews in the newsgroups. I have found some scattered info for nucleus and threadx (...


eCos Message Queue

Started by Me On Line in comp.arch.embedded12 years ago 1 reply

Hi there, Currently, i am working on porting the Protocol stack of UTMS to eCos RTOS using x86 processor. I have a problem in with the...

Hi there, Currently, i am working on porting the Protocol stack of UTMS to eCos RTOS using x86 processor. I have a problem in with the message Queues.Our system suppost the Message queues as it is provided in the Xenomai RTOS.I.e. rt_queue_create() . Though i know,how to design my own to work with it; but i need some bult in soultion. Regards, Engr. Jawad Rehman Embedded Software Engi...


Nucleus RTOS on non-MMU based processor

Started by rhaudiogeek in comp.arch.embedded13 years ago 4 replies

Folks, Does anyone have any expirence porting Nucleus on a non-MMU based processor ? What are some of the issues and/or challenges in doing...

Folks, Does anyone have any expirence porting Nucleus on a non-MMU based processor ? What are some of the issues and/or challenges in doing this. Appreciate some inputs as we are investigating supporting Nucleus RTOS for our products Thnaks


Design of uC/OS (uCOS-II) kernel

Started by karthikbalaguru in comp.arch.embedded12 years ago 28 replies

Hi, I got an interesting information from internet and i have some queries based on it as it is really strange/unbeleivable . " In a...

Hi, I got an interesting information from internet and i have some queries based on it as it is really strange/unbeleivable . " In a preemptive priority based RTOS, priority inversion problem is among the major sources of deadline violations. Priority inheritance protocol is one of the approaches to reduce priority inversion. Unfortunately, RTOS like uC/OS can't support priority inherita...


Rtos Design

Started by pachu in comp.arch.embedded15 years ago 26 replies

Hi folk, We were designing an RTOS for a general 8 bit microcontroller. We have designed a round robin schedular. But i have question...

Hi folk, We were designing an RTOS for a general 8 bit microcontroller. We have designed a round robin schedular. But i have question about the stack on 8051. My doubt is, we have our kernel (data, code) and also applications (data and code) Now we need to allocate seperate memory areas for the kernel and the application. How do we take care of the security in 8051. And als...


Keyboard task in RTOS; how to deal with long keypresses etc.?

Started by nic in comp.arch.embedded11 years ago 8 replies

Hi all I'm working on a small embedded project which runs under a simple RTOS. The Hardware includes a scanned keyboard, LCD display,...

Hi all I'm working on a small embedded project which runs under a simple RTOS. The Hardware includes a scanned keyboard, LCD display, and various motors & switches etc. The User Interface requirements call for various commands and navigation within the menu system to be selected by means of combinations of keys, and/or keys being pressed for a longer period of time. Something like "pr...


Newbie to RTOS ; need some sample code

Started by Simone Mehta in comp.arch.embedded15 years ago 1 reply

Hi RTOSians, I am a newbie to the world of RTOS programming( vxworks,psos ). I came to know from one post here that there is some code shipped...

Hi RTOSians, I am a newbie to the world of RTOS programming( vxworks,psos ). I came to know from one post here that there is some code shipped with psos which is a good place to start for learning. I wanted to compile this code on our board here. I donot have access to this code. we have psos and arm combo here. If anybody has these examples please pass it on to me, I have enquired in my ...


OSS or Free RTOS recommendations?

Started by Marco in comp.arch.embedded13 years ago 13 replies

I would like to see recommendations on existing OSS or free RTOS (with 32 bit ARM, PowerPC and x86 targets). I think it is important to have...

I would like to see recommendations on existing OSS or free RTOS (with 32 bit ARM, PowerPC and x86 targets). I think it is important to have a free-as-in-beer license for training/trial purposes as well as possibly a commercial version to actually ship products and get support. Please discuss "performance" and ease of use. Not really interested in Linux (too big). 1) RTEMS http:...


Reliable freeware (RTOS and TCP/IP) for ARM7

Started by in comp.arch.embedded12 years ago 10 replies

Hello all, We are looking for very reliable freeware for the ARM7 microcontroller (NXP). The target application is for proffesional use which...

Hello all, We are looking for very reliable freeware for the ARM7 microcontroller (NXP). The target application is for proffesional use which sets high requirements for reliability. The product is very cost-sensitive which has made us looking for freeware alternatives to the commercial/proffessional RTOS and TCP/IP stacks. We are currently considering: http://www.sics.se/~adam/uip...


Embedded RTOS and VxWorks Training

Started by Sophie Williams in comp.arch.embedded16 years ago 2 replies

HI can anyone suggest 1. where I can locate Embedded RTOS training materials 2. a qualified VxWorks trainer with his own materials thanks...

HI can anyone suggest 1. where I can locate Embedded RTOS training materials 2. a qualified VxWorks trainer with his own materials thanks Sophie


Syntax of udp_rcv NUCLEUS RTOS

Started by Crispin Jacob in comp.arch.embedded15 years ago 1 reply

Hi, I am new to nucleus RTOS. I am using nucleus PLUS 1.3 and source is already manipulated for our product development. I am trying to...

Hi, I am new to nucleus RTOS. I am using nucleus PLUS 1.3 and source is already manipulated for our product development. I am trying to implement a simple UDP client and server . But i couldnt find any socket APIs(example- NU_Socket..but it is in the new version[i dont have it]). However i found the following two in nucleus source code which i use. void udp_rcv(packet *p, void *cookie) v...