Hi,
thanks Martine for this quick reply.
You talk about a transition period...Is it stable enough to use the new
vtimer interface or when will the old hwtimer will be deprecated ? I am
not an expert but it makes sense to avoid using ticks and to have a pure
event based mechanism.
Thanks once again
Kind regards
On 08/01/2015 05:25 PM, Martine Lenders wrote:
Hi Jerome,
welcome to the RIOT community.
With your Docker problem I can't help sadly, since I never used the
image, but to your timer question: Currently we are in a transition
period: The older vtimer [1], based on hwtimer [2], that is on its way
to be replaced by an new API xtimer [3] which utilizes the peripheral
timer API [4]. If you want to schedule an event with both of them you
use the vtimer_set_msg() or xtimer_set_msg() functions respectively.
It schedules an IPC message send by the ISR at the scheduled time.
Note that this is independent from the kernel's thread scheduler since
it is tick-less and purely event based. The *_set_msg() function allow
you to schedule such events based on time.
Hope this was helpful,
Martine
[1] http://doc.riot-os.org/group__sys__vtimer.html
[2] http://doc.riot-os.org/group__core__hwtimer.html
[3] https://github.com/RIOT-OS/RIOT/pull/2926
[4] http://doc.riot-os.org/group__driver__periph__timer.html
2015-08-01 16:58 GMT+02:00 jerome <[email protected]
<mailto:[email protected]>>:
Hi all RIOT OS gurus,
let me introduce myself, I am Jerome a newbie in the embedded
world. I was previously Java architect as a freelance during 17
years (yes nobody is perfect!!).
I want to start a project with a quite tiny MCU (Cortex ARM M3 L
serie or maybe Cortex ARM M0+).
I checked the RTOS landscape and I was seduced by your project:
- C naming conventions are standard (I can't read FreeRTOS code
it's horrible)
- small
- quite well documented
- the idea to provide a Docker image is nice but I was unable to
launch it!!!
- your build system is really nice , being able to launch the
build natively is a genious idea!!! I tried to use NuttX but was
unable to build it...
I try to read the code (samples) and the docs ....
I have just a small question, even if I am a newbie with RTOS I am
quite surprised not to see in the samples/interfaces a way to
schedule timers ? This is a classical from the RTOS isn't it ?
These small schedulers just run jobs...I saw in the samples,
threads (OK) and message queues (perfect for inter threads
communication) but no timers...
I'd like to thank you for your work. I imagine I will have many
other questions and may be some kinds of proposals to your
community (adding drivers/boards).
Kind regards
Jerome akka deadbrain
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