Search found 18 matches

by atmuc
Sun Feb 21, 2021 3:54 pm
Forum: ESP32 boards
Topic: multi-threading question
Replies: 17
Views: 1411

Re: multi-threading question

https://www.youtube.com/watch?v=9vvobRfFOwk

according to this video, Raspberry pi pico uses 2 cores with MicroPython. I should buy pico when it is available in my country.
by atmuc
Sun Feb 21, 2021 10:36 am
Forum: ESP32 boards
Topic: multi-threading question
Replies: 17
Views: 1411

Re: multi-threading question

Does MicroPython still work on one core of ESP32?
by atmuc
Wed Nov 18, 2020 2:52 pm
Forum: ESP32 boards
Topic: Timer with microsecond resolution
Replies: 8
Views: 1402

Re: Timer with microsecond resolution

For time critic operations native code can be used with microPython; https://docs.micropython.org/en/latest/develop/natmod.html I started to test RMT. I plan to combine RMT and timer interrupts. I have to know the position of the stepper with 1 mm precision while it is moving. When I buffer all puls...
by atmuc
Tue Nov 17, 2020 11:21 am
Forum: ESP32 boards
Topic: Multithreading problem
Replies: 2
Views: 871

Multithreading problem

I have a thread that prints a counter. I also print another counter in the main loop. It works fine.

When a pin interrupt starts, my thread pauses until the interrupt handler code finished. is this normal?
by atmuc
Tue Nov 17, 2020 6:48 am
Forum: ESP32 boards
Topic: Timer Interrupt Priority
Replies: 8
Views: 945

Re: Timer Interrupt Priority

I tried creating a thread and using an infinite loop to handle timing on Raspberry Pi with dotnet core. This system will communicate with a PC and an LCD display via I2C. Because of those operations and the garbage collection loop is not stable. I also tried nanoFramework and native code integration...
by atmuc
Mon Nov 16, 2020 10:50 am
Forum: ESP32 boards
Topic: Timer Interrupt Priority
Replies: 8
Views: 945

Re: Timer Interrupt Priority

This is pin output with a timer interrupt. On each timer tick, output toggles. With perfect timing, all pulse width should be the same.

this output is the same before and after sleep change.
by atmuc
Mon Nov 16, 2020 6:47 am
Forum: ESP32 boards
Topic: Timer with microsecond resolution
Replies: 8
Views: 1402

Re: Timer with microsecond resolution

Thanks, Peter. I think the best way is to have an Arduino as a pulse generator to drive my stepper motor. I can communicate with Arduino and ESP32 via SPI. In that way, I will have hardware interrupt on the Arduino with minimum C++ code and have all control logic on ESP with the freedom of Python.
by atmuc
Sun Nov 15, 2020 12:10 pm
Forum: ESP32 boards
Topic: Timer with microsecond resolution
Replies: 8
Views: 1402

Timer with microsecond resolution

Can I use a timer with micro second resolution instead of milli second?
by atmuc
Sun Nov 15, 2020 12:09 pm
Forum: ESP32 boards
Topic: Timer Interrupt Priority
Replies: 8
Views: 945

Re: Timer Interrupt Priority

it still has lags

Image
by atmuc
Sun Nov 15, 2020 6:18 am
Forum: ESP32 boards
Topic: Timer Interrupt Priority
Replies: 8
Views: 945

Re: Timer Interrupt Priority

I display a counter with 1 sec period.

Code: Select all

 while True:            
            self.displayController.print(self.counter, 0, 0)            
            self.counter += 1
            sleep(1)