Ok, thanks. Do you have any other advice about how to handle this situation? Specifically, when you want to call an ESP-IDF function from an interrupt handler, and you want all the code to be in IRAM, but the function doesn't have that attribute.

I am working on the ESP32 support in FastLED, and I'm trying to figure out how to make sure that our interrupt handler code is all in IRAM. We are using the RMT peripheral to generate the signal for clockless LED chips, and the problem is that we call RMT functions in ESP-IDF that are not marked wit...

We've used this technique successfully in the ESP32 support for the FastLED library. BUT I've never set it up where rmt_set_tx_thr_intr_en is being given a value that isn't a multiple of 32 or 64. We don't use sentinels at all.(Or rather, we only use the special 0-value sentinel that indicates we ar...

Hello, I have been working on improvements to the FastLED driver for ESP32 based on the RMT device, and I've run into a problem when our code is run in conjunction with flash-based file systems. Users are reporting that their programs occasionally trigger a cache access failure when attempting to wr...

Most of our users are developing code in the Arduino IDE. And their level of programming expertise varies widely (many are beginners), so I would be reluctant to tell them to make changes to their dev environment. Really, the right answer is to figure out how to get around the GCC compiler bug, so t...

Would it be reasonable to call spi_flash_op_lock() explicitly before I start a time-sensitive operation (and then spi_flash_op_unlock() at the end)? I just need some way to avoid flash operations shutting off the caches in the middle of the process of sending bits to the LED strips, since the timing...

Thanks Ivan! On the first point, how can I check to see if some other code is disabling the caches? What API is used to disable/enable them? Yes, you're right about the compiler issue -- it is not Xtensa specific. I'm not the one who discovered the problem, so I didn't investigate it in detail. We f...

This problem seems very similar to the one I have been encountering (see post https://www.esp32.com/viewtopic.php?f=13&t=13855 from yesterday). I think the relevant documentation is here: https://github.com/espressif/esp-idf/tree/master/components/spi_flash#concurrency-constraints-for-flash-on-spi1 ...

Hello all, I am trying to track down some issues in the FastLED support for ESP32, particularly when combined with SPIFFS (for loading web interface stuff and storing animation patterns). We have had a number of reports that our driver (which uses the RMT peripheral to push bits out to the LED strip...

If it was declared static it would work (although that is not the case in the example).