abort pigpiod wave_chain?

[moderatelyfunky]

I've added some limit switches to my stepper project and if they are reached before the wave_chain is completed, I'd like to cancel the chain. I saw wave_tx_stop(), but that is built for wave_send_repeat.

Is there a way to interrupt and cancel the remainder of a wave_chain?

Thanks for any ideas

[joan]

wave_tx_stop() will work.

[moderatelyfunky]

I should have just tried it. Thanks, Joan!

[moderatelyfunky]

I am getting some unexpected behavior with my motors not running to their destinations using wave_chains. It's an odd symptom. The motors are woken up and the code shows print messages as expected, but the motors act like their step pins aren't set high.

When I run the motors with PWM, the limit switches work as expected and home the motors

Here is my setup:
1. Callbacks are setup for each of the four limit switches. If closed, set a "global" halt flag and run a homing method for each.
2. Callbacks are setup for each of the four motors. The callbacks are used to count steps for each.
3. A check in the gotoPreset method that cancels the wave_chain if the halt flag is true

Code: Select all

   
        ...wave chain creation and send...
        
	while self.pi.wave_tx_busy():
            if (self.haltAll == 1):
                self.pi.wave_tx_stop()
            else:
                time.sleep(0.1)
    

If I remove the limit switch callback, the motors run to their destinations as expected.

If I add back the limit switch callback and comment the self.pi.wave_tx_stop() in the while loop above, the motors run to their destinations as expected.

One complication that may play a role is that when running to a preset destination with wave_chains, all four motors may be running at once, whereas when using the PWM method, only one motor is running at a time.

Thanks for any suggestions