rtos

Gavinmc42

... for a low price desktop Vapour reflow setup. In the muliticore Pi's each Arm core has a local timer, I have a theory this could be used for a RTOS. The only example that makes sense to me so far is the Ultibo Multicore example, not even going to bother doing this under Linux. My brain only ...

kusti8

... they come with a Adc, but more complex things later. If you don't need bit accuracy, the Pi is much more powerful. Very many people don't need a RTOS with the Pi.

SatanicEngineer

... W based on form factor alone. I expected roughly the same kind of board as a Nano but faster proc. Oops! These Pi0Ws are linux laptops running an rtos! I mean, OTG USB ports?! HDMI w/ EDID!? :shock: Again, it's down to free time. I'll try to allocate a few (hundred?) hours learning what I & it ...

scotty101

... time'. The luxury of being able to do this comes about because of the underlying operating system which manages the execution of each thread. 3. RTOS. Real Time Operating Systems such as FreeRTOS allow you to create tasks and schedule them to run every x milliseconds. Different tasks can communicate ...

Gavinmc42

... power mode. VC4 hands controls to the Arm. Can it be handed back for sleep mode? Going to lose the OS code in Dram if that is turned off. Small RTOS in cache? The only simple solution I have thought of is turn power off completely and have something else waking the Pi up periodically.

joan

... = 280us tmax = 511us Jessie driver space: tmin = 6us tave = 12us tmax = 43us You will have to look around for quoted response times for some Pi RTOS systems. The user space figures seem too high to me, I usually get timings of 50-100µs between a GPIO level change and the userland process waiting ...

LdB

Most non RTOS O/S behave that way when the USB or Drive access is used in that way, there is nothing unique about Raspbian in that regard. If you are doing stuff that is that time critical you shouldn't be dealing with it that ...

Gavinmc42

Prototype with Raspbian Linux. 4-8GBs Field tests with piCore Linux. <100MB Port to FreeRTOS <10's MB? Production with Ultibo DIY OS <3MB Do it in stages, stop at the one you are happy with. I skipped the RTOS stage as my production/testing is mainly for one off IoT ...

mikronauts

... the realities of Linux and ARM based SOC's limit what can easily be done. Hello. Would you please tell me that, which of the Real time patchs and RTOS that are implemented for Raspberry Pi are capable of doing task with maximum duration time of 50us (maximum latency of 5us) for example http://www.frank-durr.de/?p=203 ...

vgs1988

Dear Gavinmc42

Thanks for your answer

Is there any information of maximum latency of Free RTOS?

It seems that Ultibo can be a choice for implementing real time (below 50us). Is it proper for my application? Where can I find documentation about running it on raspberry pi 2 b?

vgs1988

... much? Thanks Gavinmc42 for introducing ultibo, but I think I am really far from being an expert in that field. What if I switch to a commerical RTOS? Is there a done work for raspberry pi?

I doubt Linux can do that. You might be able to write bare metal code that could do it, or find a proper RTOS that has been ported to the Pi.

vgs1988

Hello. Would you please tell me that, which of the Real time patchs and RTOS that are implemented for Raspberry Pi are capable of doing task with maximum duration time of 50us (maximum latency of 5us) for example http://www.frank-durr.de/?p=203 says that RT ...

i486

Maybe RISC OS? I remember there was RTOS in the past...

Gavinmc42

Vpu runs an rtos, multithreaded, fairly responsive. But not easy to write code for, especially the quads. And cannot really add code to current firmware without access to source code. But say I did not want any graphics, hdmi, ...

... tick, QPU assembler tick, what else is needed? Pi Zero - 1 ARM cores, 2 x VPU's, 12 x QPU's (48 ALU's?). What benchmark to use? Vpu runs an rtos, multithreaded, fairly responsive. But not easy o write code for, especially the quads. And cannot really add code to current firmware without ...

Gavinmc42

... ways could be to get the VC4 doing the GPIO. But I'm not sure if the VPU's are documented enough. But it is known to run ThreadX which is a RTOS. We know the GPU can drive DPI LCDs, these are synchronous? LCD data is just a waveform of parallel bits. SMI memory mode could be another way ...

vgs1988

... number of frequencies were possible to be generated. Is it possible for you to develop this? ( and if yes with more accuracy). About using RTOS on raspberry pi, what is your opinion about that. Thanks in advance

joan

Pigpio has less than 6 hardware pwm pin, so I have trouble in output pins too. Some methods suggest that I should use real time kernerl like "Free RTOS" and boot them on raspberry pi. Do you think that using a real time system on raspberry pi can solve delays on timing and make soft pwm pins accurate ...

vgs1988

Pigpio has less than 6 hardware pwm pins, so I have trouble in output pins too. Some methods suggest that I should use real time kernels like "Free RTOS" and boot them on raspberry pi. Do you think that using a real time system on raspberry pi can solve delay problems (cpu delays in fact) on timing ...

DavidS

... has made SBC's that are affordable enough that people can have dozens lying around at home :oops: They don't have to run WinIoT/Linux/Unix/CPM/DOS/RTOS/RiscOS/RedoxOS. Thanks to Garry and many others anyone can make their own OS and know exactly what is in it and how it works, if they choose to. ...

Gavinmc42

... has made SBC's that are affordable enough that people can have dozens lying around at home :oops: They don't have to run WinIoT/Linux/Unix/CPM/DOS/RTOS/RiscOS/RedoxOS. Thanks to Garry and many others anyone can make their own OS and know exactly what is in it and how it works, if they choose to. ...

Gavinmc42

... Little Kernel on VC4? https://github.com/fuchsia-mirror/magenta/blob/master/docs/mg_and_lk.md LK, RTOS, ThreadX. We know ThreadX works :lol: Having Millions of Pi's out there is a platform for experimentation. The only thing stopping this is lack ...

Gavinmc42

... TRON, T-engine, just had flashback http://www.t-engine.org/ What sits between a RTOS and a GP OS? Will it's colour be Fuchsia or Magenta? What is going to be the RT 64bit multicore OS of the future? Which University has a post grad ...

Gavinmc42

... application called kernel.img Making a dedicated purpose OS as opposed to a General Purpose OS. FreeDOS is a GP OS but most people using a RTOS are doing it for a single application. GP OS's can run many more virus programs, RTOS are less susceptible to nasty attacks. That said my current ...

Search found 616 matches: rtos

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Re: Need 6 output & 8 input accurate PWM pin on Raspberry Pi

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Re: Real-Time Thread in ThreadX on VideoCore

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