Hi Simon,
I remember there where some students with the same precise time
requirements for an LED stripe. They figured out that the minimum
measurable time for a pin toggling delayed with xtimer was about some us
on a phytec board. They went over to introduce a defined number of
"nops" for that. You can use the scope in our office to test that!
Best
Peter
Am 16.02.2016 um 18:25 schrieb Simon Brummer:
Hi Martin,
According to the Datasheet there is a tolerance of 150 ns in the
Timings. I'll guess a resolution of 300 ns would be fine too.
I could use inline assembler for precise time wasting but I'd prefer
the usage of a timer implementation.
I'd like to see this driver in a pull request some day ;)
Am Dienstag, den 16.02.2016, 18:17 +0100 schrieb Martin:
Hi Simon,
I'm not the timer expert, but to reliably get a 100 ns resolution
sounds
rather tough an a system that runs with 170MHz [1].
I think there's not too much air between xtimer and the bare silicon.
You can have a look into the timer configuration [2] and the timer
interrupts [3] of your board.
But I guess this is not what you want.
Best regards,
Martin
[1] https://github.com/RIOT-OS/RIOT/wiki/Board%3A-STM32F4discovery
[2]
https://github.com/RIOT-OS/RIOT/blob/master/boards/stm32f4discovery/i
nclude/periph_conf.h#L53
[3]
https://github.com/RIOT-OS/RIOT/blob/master/cpu/stm32f4/periph/timer.
c#L288
Am 02/16/2016 um 05:17 PM schrieb Simon Brummer:
Hi Everybody,
I'll try to write a driver for a programmable RGB-Ledstripe. To
programm the timing for the Ledstripe I need a timerresolution of
100
ns. As far as I can see, xtimer features only a 1 µs resolution. Is
there a way to adjust xtimers resolution or is there another way to
use
timers in a generic way?
My Project runs on a stm32f4 discovery board.
Simon
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--
Peter Kietzmann
Hamburg University of Applied Sciences
Dept. Informatik, Internet Technologies Group
Berliner Tor 7, 20099 Hamburg, Germany
Fon: +49-40-42875-8426
Web: http://www.haw-hamburg.de/inet
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