<![CDATA[LOPY Timer interrup]]>Hi,

I need to generate a square signal on a pin at a precise frequency as the PWM function could do.
But i need to adjust this frequency in real time .. mmm.. the goal is to generate a square signal to control a stepper motor including acceleration phases.

So, i'm searching something like a timer interrupt where i could adjust frequency outside the handler.

i found that :
https://forum.pycom.io/topic/897/timer-and-uart-confugration

but it doesnt compile on my LOPY ?

Could you please give me some help or ideas to solve my problem ?

thanks

]]>https://forum.pycom.io/topic/2245/lopy-timer-interrupRSS for NodeSun, 14 Jun 2026 02:19:05 GMTThu, 30 Nov 2017 16:37:11 GMT60<![CDATA[Reply to LOPY Timer interrup on Thu, 30 Nov 2017 16:37:11 GMT]]>Hi,

I need to generate a square signal on a pin at a precise frequency as the PWM function could do.
But i need to adjust this frequency in real time .. mmm.. the goal is to generate a square signal to control a stepper motor including acceleration phases.

So, i'm searching something like a timer interrupt where i could adjust frequency outside the handler.

i found that :
https://forum.pycom.io/topic/897/timer-and-uart-confugration

but it doesnt compile on my LOPY ?

Could you please give me some help or ideas to solve my problem ?

thanks

]]>https://forum.pycom.io/post/13282https://forum.pycom.io/post/13282Thu, 30 Nov 2017 16:37:11 GMT<![CDATA[Reply to LOPY Timer interrup on Thu, 30 Nov 2017 19:34:44 GMT]]>@easytryer The example you refer to is for a WiPy 1 device. That's not compatible to a WiPy 2 or LoPy. using a time interrupt is not recommended, since interrupts on the Lopy (and all the other Espressif devices) have a vary long and varying latency (see https://forum.pycom.io/topic/936/pin-interrupt-latency). The test was made for a Pin interrupt, but for timer interrupts you should expect the same behavior.

]]>https://forum.pycom.io/post/13288https://forum.pycom.io/post/13288Thu, 30 Nov 2017 19:34:44 GMT<![CDATA[Reply to LOPY Timer interrup on Sat, 02 Dec 2017 13:22:13 GMT]]>hi.

thanks for this informations.
Is there a way to acheive my goal or have i to return on more real time uController ?

regards

]]>https://forum.pycom.io/post/13329https://forum.pycom.io/post/13329Sat, 02 Dec 2017 13:22:13 GMT<![CDATA[Reply to LOPY Timer interrup on Sun, 03 Dec 2017 13:42:44 GMT]]>@easytryer
We introducing a Python interface to the RMT peripheral very soon (already in testing) I think it’ll do what you neeed

]]>https://forum.pycom.io/post/13337https://forum.pycom.io/post/13337Sun, 03 Dec 2017 13:42:44 GMT<![CDATA[Reply to LOPY Timer interrup on Sun, 03 Dec 2017 14:54:41 GMT]]>@jmarcelino
thanks. I'll wait and try.

]]>https://forum.pycom.io/post/13338https://forum.pycom.io/post/13338Sun, 03 Dec 2017 14:54:41 GMT