Raspberry pi pico making loop / OSError: core1 in use

[berke]

Hello everyone, ı am using raspberry pi pico. When I write this line, stepper's full rotation is 5 seconds.

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def runstepper():
        enaPin.low()
        pulPin.low()
        time.sleep_ms(1)
        pulPin.high()
        time.sleep_ms(1)
while True:
    runstepper()

When I wrote this code, stepper's full rotation is 2.24 minute. It is too slow. How can I make it faster like first code? Should I use second _thread? I tried with that , it is working but I can't do my async tasks. Any advice? I am using micropython since august, I used some sensors and servos before. Thank you.

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def calcWeight():
    val = hx711.get_value()
    print(val*5/scale)
    time.sleep_ms(1)
def runstepper():
        enaPin.low()
        pulPin.low()
        time.sleep_ms(1)
        pulPin.high()
        time.sleep_ms(1)
while True:
    runstepper()
    calcWeight()

If I use _thread, my code is working but only one time. After that it gives OSError:core1 in use . I know this error. This error appears because I am using _thread in

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while True:

Here is working loop but only one time then

core 1 in use error

appears. Is there a way that I can pass this error even I use while True ?

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def main():
    while True:
            response = http.GET("example.com")
            _thread.start_new_thread(measureweight_thread, ())
            utime.sleep(0.01)
            runstepper()
            time.sleep(1)
            relaylow()
            time.sleep(2)
            relayhigh()
            utime.sleep(0.01)
main()

[pythoncoder]

You can only start a new thread once because you only have one spare core. If you want the motor to run continuously you want to do something like:

Code: Select all

def runstepper():
    enaPin.low()
    while True:
        pulPin.low()
        time.sleep_ms(1)
        pulPin.high()
        time.sleep_ms(1)

Then, in your main code, run this once only:

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_thread.start_new_thread(runstepper, ())

If you want to be able to start and stop the motor, share a boolean variable between your main code and the runstepper thread.

[berke]

You can only start a new thread once because you only have one spare core. If you want the motor to run continuously you want to do something like:

Code: Select all

def runstepper():
    enaPin.low()
    while True:
        pulPin.low()
        time.sleep_ms(1)
        pulPin.high()
        time.sleep_ms(1)

When I do something like that for hx711, it stops. It is not working continuously. It works for one line then hx711 stops.

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current_value=False
def measureweight_thread():
    global current_value
    while trigger_hx711:
        value = hx711.get_value()
        time.sleep_us(300000)  #  I tried without time.sleep or lower valus, nothing change. If I decrease 300000 , hx711 send 2 value or 5 value instead of 1.
        print(value*5/scale)
        if(value>=0.2):
            current_value=True
        utime.sleep(0.01)      
_thread.start_new_thread(measureweight_thread, ())

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def main():
    while True:
            response = http.GET("example.com") 
            runstepper()
            time.sleep(1)
            relaylow()
            time.sleep(2)
            relayhigh()

main()

[pythoncoder]

It is possible you're running into this issue. I have encountered erratic behaviour accessing UARTs and SPI devices on the second core.

You might want to consider achieving concurrency with uasyncio rather than dual core.

[berke]

It is possible you're running into this issue. I have encountered erratic behaviour accessing UARTs and SPI devices on the second core.

You might want to consider achieving concurrency with uasyncio rather than dual core.

Yes I was using UART for http response. That's why I guess. Now I am not using second core, I write PWM for stepper thanks to @horuable. Now It is working as I want.