Build/Make problem with ESP32 compile

[superace]

Having fighting with this problem for days now I am stuck but I need this to work.

Ubuntu LTS 64bit, plenty of RAM plenty of CPU. I am trying to follow this guide https://www.microdev.it/wp/en/2018/08/0 ... for-esp32/ but obviously I get it wrong somewhere.

I have created the example Makefile

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ESPIDF = /home/myuser/Micropython/esp32/esp-idf
#PORT = /dev/ttyUSB0
#FLASH_MODE = qio
#FLASH_SIZE = 4MB
#CROSS_COMPILE = xtensa-esp32-elf-
 
include Makefile

Followed the steps after and then

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cd ports/esp32
make

make crashes and "Too many open files" is the reason reference to Line 7 (if I understand correctly)
Line 7 being include Makefile.

Anyone seen this before? Hints?

I am using ESP32 with micropython already from pre-compiled files from the Micropython Download area. Great stuff! But I am now in need of Double precision and all the ESP32 files are single precision so I am forced to set up a local development environment.

Obviously it can be done, obviously I need help

[jimmo]

hi,

The makefile that you create needs to be lower case "makefile", distinct from the upper case "Makefile" already in the repo.

When you run "make" it uses either a makefile or Makefile (in that order) from the current directory, so the idea here is that the makefile is used instead (which sets some things, then includes the real Makefile).

[superace]

But of course, that makes sense I was wondering how the include file could be including itself. Will test this tomorrow. Thank you.

[superace]

Great advice! I have gotten my PC to create a usable software with double precision.

I still don't understand why the build size is 1.5Mb for the firware.bin file, aprox 3 times the file size found on the download page and I don't really get how to make sure I get the last stable version of 1.12 but that's something I can live with for the moment.

Thank you!

[jimmo]

I still don't understand why the build size is 1.5Mb for the firware.bin file, aprox 3 times the file size found on the download page...

If you compile with single precision does it go back to the original size?

Because the ESP32 doesn't have hardware double-precision floating point, it needs to generate a lot of code to emulate double-precision. I'm surprised it's 3x though.

get the last stable version of 1.12 but that's something I can live with for the moment.

git checkout v1.12

[tve]

I still don't understand why the build size is 1.5Mb for the firware.bin file, aprox 3 times the file size found on the download page and I don't really get how to make sure I get the last stable version of 1.12 but that's something I can live with for the moment.

Where do you get your sizes from? This is how the build of v1.12 ends for me:

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LINK build-GENERIC/application.elf
   text    data     bss     dec     hex filename
1073163  266012   46364 1385539  152443 build-GENERIC/application.elf
Create build-GENERIC/application.bin
esptool.py v2.8-dev
Create build-GENERIC/firmware.bin
bootloader     21200
partitions      3072
application  1339312
total        1404848

Fortunately we can also look-up travis to see how the official release download was generated (https://travis-ci.org/micropython/micro ... /627577916), here is how it ended:

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LINK build-GENERIC/application.elf
   text	   data	    bss	    dec	    hex	filename
1073755	 267684	  46356	1387795	 152d13	build-GENERIC/application.elf
Create build-GENERIC/application.bin
esptool.py v2.8-dev
Create build-GENERIC/firmware.bin
bootloader     21280
partitions      3072
application  1341568
total        1407104

Not that different... (I used `DEBUG=1` which probably accounts for the difference...)

Here's a build of master:

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LINK build-GENERIC/application.elf
   text    data     bss     dec     hex filename
1082073  268168   46444 1396685  154fcd build-GENERIC/application.elf
Create build-GENERIC/application.bin
esptool.py v2.8
Create build-GENERIC/firmware.bin
bootloader     21648
partitions      3072
application  1350368
total        1415904

Not that much bigger at all...