Re: Draw OpenGLScene without WM_PAINT

On May 20, 4:25 am, Albe <alberto_res...@[EMAIL PROTECTED]
> wrote:
> I agree aku ankka, it doesn't benefit render faster than the refresh
> rate of the display, I have to refresh only when a new data occours
> but the WM_PAINT message is faster than the data. I have associated
> the high CPU usage with the faster WM_PAINT message, I'm not sure that
> it is correct, I tried to eliminate the WM_PAINT function in
> OpenGLControl::OnPaint and the CPU usage decrease to 15-25%, I tried
> to comment the code in OpenGLControl::OnPaint (I create the
> openglwindows but I don't draw aniting) the CPU usage stay to 95-98%.
>
> To USB I read a serial data composed to 10 bytes, the time betwenn two
> samples is settable at 50 Hz, 100Hz, 400Hz and 1000Hz. My driver
> maximum speed is 600 Hz (I have same problem when the device write at
> 1000 Hz but is not my priority now).
>
> Thank you for sup****t

you must be pooling when reading from USB
can you switch to a blocking I/O ? this will save CPU resources a lot