Open source Licence

[nickparrin]

Keep getting an error like this:

developer@developer:~/esp32/pycom-micropython/esp32$ make BOARD=LOPY LORA_BAND=USE_BAND_868
LINK build/LOPY/release/bootloader/bootloader.elf
xtensa-esp32-elf-gcc -nostdlib -Wl,-Map=build/LOPY/release/bootloader/bootloader.map -Wl,--no-check-sections -u call_user_start_cpu0 -Wl,-static -Wl,--undefined=uxTopUsedPriority -Wl,--gc-sections -T esp32.bootloader.ld -T esp32.rom.ld -T esp32.peripherals.ld -Wl,--start-group -Llib -L/home/developer/esp32/pycom-esp-idf/components/esp32/ld -Lbuild/LOPY/release/bootloader -L/home/developer/esp32/pycom-esp-idf/components/esp32/lib -Lbootloader -llog -lcore -lspi_flash build/LOPY/release/bootloader/bootloader.a -Wl,--end-group -Wl,-EL -o build/LOPY/release/bootloader/bootloader.elf
/home/developer/esp32/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/4.8.5/../../../../xtensa-esp32-elf/bin/ld: cannot find -lcore
collect2: error: ld returned 1 exit status
application.mk:274: recipe for target 'build/LOPY/release/bootloader/bootloader.elf' failed
make: *** [build/LOPY/release/bootloader/bootloader.elf] Error 1

I set the IDF_PATH and added gcc to PATH. Tried with the ln command, and without by editing the Makefile directly

EDiT: fixed it thanks to daniel. I missed to import (inside pycom idf) the needed compontents:

• git submodule update --init

[livius]

Will be good to see port of this
https://github.com/micropython/micropython/pull/2091/files
and also enable time_us() which is currently commented out in the code
but i suppose it is limited by some esp32 IDF? and because of this is commented out?
https://github.com/pycom/pycom-micropython/blob/master/esp32/mods/modutime.c

[daniel]

@livius yes, machine.time_pulse_us() is very useful and we will implement it for the ESP32. A number of function in the time module are incomplete due to previous limitations of the IDF. The plan is to get back to that and implement them in early January.

Cheers,
Daniel

[livius]

@daniel
thank you for the info - especially about time frame

[livius]

@daniel
Can i ask what is IRAM_ATTR in functions declaration?

[daniel]

@livius that's needed in order to place functions inside the instruction RAM of the ESP32. Otherwise they will reside in flash, which means that they need to be fetched from the SPI flash everytime there's a cache miss. Time critical functions must be placed inside IRAM, as well as interrupt handlers.

[livius]

@daniel
Thank you very much :)
I still analyze repo (and learn C which is not my language) and need to understand internals until i change something on my side.

[livius]

We have correlation between
pycom/pycom-micropython
and
https://github.com/pycom/pycom-esp-idf

will be good when you send update to new version
e.g. 1.3.0.b1 do the same in pycom-esp-idf

because i do not know now how to revert firmware to older version.
I can simply download pycom-micropython at certain firmware version(commit)
but do not know how do this in correlation with esp-idf (do not know which commit)

[daniel]

@livius I was almost sure that we also pushed to Github the latest pycom-esp-idf, but it seems we didn't. That is corrected now and everything us up to date. Thanks for pointing it out.

Cheers,
Daniel

[livius]

@daniel
but i do not talk about this
only when you commit to pycom-esp-idf
add comment or some file as "version" and write there same string as is for pycom-micropython e.g. `1.3.0.b1'

we then can back in commits and download esp-idf and pycom in the same version (older)

but thank you for the update

[daniel]

@livius good point, we'll start tagging it like this from now on. Thanks!

[beyonlo]

I am pleased to confirm that the firmware of Pycom modules is now Open source and can be found here https://github.com/pycom/pycom-micropython

I remember to read in the past a topic in the "Announcements & News" about that PyCom and Micropython (Damien George) will work together on ESP32 port. Well, I would like to know some things:

1. Where are there this topic? Anyone can past me the URL?
2. Is this https://github.com/micropython/micropython-esp32 the official address to MicroPython to ESP32 where PyCom and Damien are working together?
3. I remember (via that announcement) that PyCom will be to commit the source code ESP32 project directally to official port (address above), is that happen? Because I checked today that last commit was done more than a month ago and less than a month PyCom released a new firmware with modifications on the MicroPython.

Thank you.