Hello Xiang Xiao,
The DWT_CYCCNT register provides the high-resolution time I need.
Thanks for the solution!
Jiawei Wang <m...@jwang.link>
On 2025/01/13 16:02:45 Xiang Xiao wrote:
> why not use perf count from DWT for performance measurement:
>
https://github.com/apache/nuttx/blob/master/arch/arm/src/armv7-m/arm_perf.c
>
> On Mon, Jan 13, 2025 at 11:59 PM Roberto Bucher <bu...@gmail.com>
> wrote:
>
> > Hi Jiawei Wang
> >
> > I have a similar requirement. The solution with SysTick and a little
> > tick in configuration used through semaphores, doesn't solve the
problem
> > in a good way: shorter sampling times (<500us) are difficult to obtain,
> > in particular in pysimCoder generated code. This is my experience, but
> > I'm still waiting for a better solution.
> >
> > Bye
> >
> > Roberto
> >
> >
> > On 1/13/25 2:57 PM, Jiawei Wang wrote:
> > > Hello everyone,
> > >
> > > I am currently developing on an STM32H7 board using NuttX and am
in need
> > of a high-resolution timer to profile my program.
> > >
> > > A timer with microsecond resolution would suffice.
> > >
> > > My initial approach was to utilize one of STM32's timers
configured in
> > 1MHz auto-reload counter mode, and then combine the counter
register value
> > with the SysTick value to derive a time measurement. However, this
method
> > feels somewhat hacky and bypasses the OS's abstraction layer, which I
> > prefer to maintain.
> > >
> > > As I am relatively new to NuttX, I am unsure of the conventional
method
> > within NuttX to achieve this functionality and have not found relevant
> > examples. Any guidance or pointers would be appreciated.
> > >
> > > Thank you,
> > >
> > > Jiawei Wang <me...@jwang.link>
> >
> >
>
