MicroPython Forum (Archive)

Your issue here is how you're using sideset. The sideset outputs will be set when the wait instruction begins executing, not after the wait finishes and the next instruction is about to start executing. I hope the following example program illustrates what's causing the inversion in your original co...

Nice job getting it all working, and thank you for sharing your solution! I learned a few things from it. Another approach might be to represent your states as quaternions rather than euler angles. In that representation the math gets a bit easier and you won't need the same special-cases. It looks ...

pythoncoder wrote: ↑

Fri Apr 30, 2021 10:19 am

Putting delays in an interrupt service routine is a bad idea

Aren't these callbacks just scheduled for execution outside of the ISR context with mp_sched_schedule anyway?

It's my understanding that timers in the rp2 port are implemented using alarm pools described at https://raspberrypi.github.io/pico-sdk-doxygen/group__alarm.html#details. The C-level callback for those alarms does get executed from the timer interrupt handler, but the C callback that micropython pro...

You can use expressions with observable side-effects to find out what the implementation is doing: if False && foo[0]: pass will succeed, while if True && foo[0]: pass will tell you that foo isn't defined. Out of curiosity, which languages have a different evaluation-order for their boolean operators?

Set mappings are much more limited than out mappings. You can only address 5 pins, but also writing to those pins has to be done from immediate values, i.e. encoded directly into the instruction. That makes working with set pins a lot trickier if the desired output depends on run-time data, such as ...

// is the floor division operator, and floor(-2.5) is -3. You can use int() to explicitly round towards zero if so desired.

Thanks - I didn't realise daily builds were a thing and just built from source after seeing the fix was merged.

Thank you for clearing up my misunderstanding, Robert. There isn't even space in the instruction to fit a 32 bit value :oops:! With that insight, and the work you and others put into https://github.com/micropython/micropython/issues/6933, I am now able drive the 10 GPIOs I need for this particular a...

I wrote my first few PIO programs today and had success using set and side-set mappings to have PIO programs change GPIO pins. I now want to move on to interfacing with a device that needs more pins than set or side-set mappings can provide, so I want to use an out mapping instead. I started with @r...