ESP32

[IhorNehrutsa]

Hi everyone. I noticed issue #5. I work with micropython under Ubuntu. Some installation commands in ubuntu_install.zip

I can compile examples from esp-idf and mpy-cross from micropython. I try to compile micropython ESP32 port with modules. modules.zip The directory structure is:

$(HOME)/
   | esp-idf
   | micropython
   | micropython-wrap
   | modules

I added

INC += -I$(HOME)

to the micropython/ports/esp32/Makefile.

The micropython-wrap is switched to ESP32-C++ branch. The micropython is switched to git hash (v3.3): 9e70825d1e1cbf7988cf36981774300066580ea7.

The 'example' module and 'temperature_conversion' module are compiled well and work after flashing 'firmware.bin' to the ESP32 generic board.

(build-venv) pc@ubuntu:~/micropython/ports/esp32$ make USER_C_MODULES=../../../modules all
Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.
Including User C Module from ../../../modules/temperature_conversion
Including User C Module from ../../../modules/example
Building with ESP IDF v3
GEN build-GENERIC/genhdr/qstrdefs.collected.h
QSTR not updated
GEN build-GENERIC/genhdr/compressed.collected
Compressed data not updated
AR build-GENERIC/esp-idf/esp32/libesp32.a
LINK build-GENERIC/application.elf
   text    data     bss     dec     hex filename
1099596  278868   37380 1415844  159aa4 build-GENERIC/application.elf
Create build-GENERIC/application.bin
esptool.py v2.8
Create build-GENERIC/firmware.bin
bootloader     21344
partitions      3072
application  1378592
total        1444128

Compiling with 'foo' module gets errors:

(build-venv) pc@ubuntu:~/micropython/ports/esp32$ make USER_C_MODULES=../../../modules all
Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.
Including User C Module from ../../../modules/foo
Including User C Module from ../../../modules/temperature_conversion
Including User C Module from ../../../modules/example
Building with ESP IDF v3
GEN build-GENERIC/genhdr/qstrdefs.collected.h
QSTR not updated
GEN build-GENERIC/genhdr/compressed.collected
Compressed data not updated
CC ../../../modules/foo/foo.c
In file included from /home/pc/micropython-wrap/detail/frompyobj.h:4:0,
                 from /home/pc/micropython-wrap/detail/callreturn.h:4,
                 from /home/pc/micropython-wrap/functionwrapper.h:4,
                 from ../../../modules/foo/foo.c:1:
/home/pc/micropython-wrap/detail/micropython.h:7:8: error: expected identifier or '(' before string constant
 extern "C"
        ^
In file included from /home/pc/micropython-wrap/detail/frompyobj.h:4:0,
                 from /home/pc/micropython-wrap/detail/callreturn.h:4,
                 from /home/pc/micropython-wrap/functionwrapper.h:4,
                 from ../../../modules/foo/foo.c:1:
/home/pc/micropython-wrap/detail/micropython.h:24:17: fatal error: cmath: No such file or directory
 #include <cmath>
                 ^
compilation terminated.
make: *** [../../py/mkrules.mk:63: build-GENERIC/foo/foo.o] Error 1

I see cmath files. They notated with: // -- C++ -- C forwarding header.

Where can I add the include path? Thanks.

[stinos]

The micropython-wrap is switched to ESP32-C++ branch. The micropython is switched to git hash (v3.3): 9e70825d1e1cbf7988cf36981774300066580ea7.

That last one is not going to work, should also be my ESP-32-C++ branch, per the instructions I left in at https://github.com/stinos/micropython-wrap/issues/5#issuecomment-680870982

rom ../../../modules/foo/foo.c:1: /home/pc/micropython-wrap/detail/micropython.h:7:8: error: expected identifier or '(' before string constant extern "C"

micropython-wrap is C++ code and must be compiled with a C++ compiler, you are compiling it as C code, which is also why it does not find cmath.h. Pleas try with the instructions mentioned above (my commits add support to MicroPython to allow C++ code in user modules), and use C++ code in a file like foo.cpp, not foo.c.

[stinos]

Closing this since another user could use the instructions in aforementioned issue to build and run the C++ module.