如何在ESP-IDF项目中添加外部库
我一直在尝试修复几天，因此任何洞察力都将不胜感激。我正在使用ESP32板和VSCODE的ESP-IDF框架来构建一个项目。我很难访问外部库的功能。例如，我已经在C中实现了一个FFT-Noise滤波器程序，现在我想将其带入ESP-IDF框架中。我认为这与我对Cmake的不熟悉有关，我尝试了各种不同的“ cmakelists.txt”，但不确定它应该是什么样的。我经历了CMAKE教程，但我无法弄清楚。这是我当前的“ cmakelists”内部文件夹中的“ cmakelists”，
idf_component_register(SRCS "hello_world_main.c"
INCLUDE_DIRS ".")
我从ESP-IDF的示例中取了一个示例项目“ hello_world”，然后在“ hello_world_main.c”中写下了我自己的代码。这很奇怪，因为在我的“ hello_world_main.c”中，Crumplier似乎知道一些数据类型，例如'fftw_complex'，这些数据仅在我要使用的库中找到。但是，当我从同一库中调用诸如fftw的“ malloc”之类的任何函数时，我会
从hello__world_main.c的'app_main（）中摘录
//complex: double[2] = {real_part,imag_part}
fftw_complex *in, *out; //no errors here for some reason
fftw_plan p;
//initialize the arrays-> "in" is an array of fftw_complex type (basically a pair of doubles)
//in is f (set of points we know) -> out is fhat (complex fourier coefficents) with magnitude and phase
in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N); //'undefined reference to fftw_malloc'
Error message:
到fftw_malloc（）的fftw_malloc（）''norde trece to reffftw_malloc（）：[5/7] 失败：hello_world_2.elf cmd.exe /c“ cd。 -elf-g ++ -mlongcalls -wno -frame -address @cmakefiles \ hello_world_2.feld_2.fel.rsp -o hello_world_2.elf＆amp;＆amp;＆amp;＆amp;光盘 。” c：/users/bgreenwood/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-eptensa-esp32-elbin/../ lib/gcc/ lib/gcc/ xtensa-estensa-esp32-fell/8.4 .0 /../../../../../ XTENSA-EST32-ELF/BIN/LD.EXE：ESP-IDF/MAIN/LIBMAIN.A（HELLO_WORLD_MAIN.C.OBJ） 0x1c）：未定义的引用 ``fftw_malloc''
所以我的问题是，我如何才能获得我的主机来识别我正在拨打的功能？
I've been trying to fix this for a couple days so any insight would be greatly appreciated. I am building a project with an ESP32 board and VSCode's esp-idf framework. I am having trouble getting access to an outside library's functions. For example, I have implemented an FFT-noise-filter program in c, and now i want to bring it into the esp-idf framework. I think it has something to do with my unfamiliarity with CMake, and I have tried all sorts of different "CMakeLists.txt", but not sure what it should look like. I've been through cmake tutorials, but I just can't figure it out. Here's my current 'CMakeLists' inside main folder
idf_component_register(SRCS "hello_world_main.c"
INCLUDE_DIRS ".")
I took an example project 'hello_world' from esp-idf's examples, and wrote my own code inside of the 'hello_world_main.c'. It is weird because in my "hello_world_main.c" the complier seems to know some data types such as 'FFTW_Complex', which are only found in the library I'm trying to use. However, when I call any functions like FFTW's 'malloc' from that same library, I get an error "undefined reference to fftw_malloc()"
excerpt from hello_world_main.c's 'app_main():
//complex: double[2] = {real_part,imag_part}
fftw_complex *in, *out; //no errors here for some reason
fftw_plan p;
//initialize the arrays-> "in" is an array of fftw_complex type (basically a pair of doubles)
//in is f (set of points we know) -> out is fhat (complex fourier coefficents) with magnitude and phase
in = (fftw_complex*) fftw_malloc(sizeof(fftw_complex) * N); //'undefined reference to fftw_malloc'
Error message:
[5/7] Linking CXX executable hello_world_2.elf
FAILED: hello_world_2.elf
cmd.exe /C "cd . && C:\Users\bgreenwood.espressif\tools\xtensa-esp32-elf\esp-2021r2-patch3-8.4.0\xtensa-esp32-elf\bin\xtensa-esp32-elf-g++.exe
-mlongcalls -Wno-frame-address @CMakeFiles\hello_world_2.elf.rsp -o hello_world_2.elf && cd ."
c:/users/bgreenwood/.espressif/tools/xtensa-esp32-elf/esp-2021r2-patch3-8.4.0/xtensa-esp32-elf/bin/../lib/gcc/xtensa-esp32-elf/8.4.0/../../../../xtensa-esp32-elf/bin/ld.exe: esp-idf/main/libmain.a(hello_world_main.c.obj):(.literal.app_main+0x1c): undefined reference to
`fftw_malloc'
so my question is, how can I get my main to recognize the function calls I am making?
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将您的libcode.c添加到：
并将引用添加到libcode.h：
libcode是一个人造名称，通过正确的名称更改它，您也可以在需要时添加一个目录，例如“ libcode/libcode.h”，
希望这可以回答您的问题;使用更多代码，更容易理解您的问题。
Add your libcode.c to:
And add a reference to libcode.h:
Libcode is an artificial name, change it by the correct one and you could also add a directory if needed like “libcode/libcode.h”
Hope this answers your question; with more code it’s easier to understand your problem.
要检查最小组件的外观，您可以使用
idf.py create-component name创建一个。将制作名称名称的组件，您可以检查外部库中缺少的内容。To check what the minimal component would look like, you can create one using
idf.py create-component NAME. The component named NAME will be made, and you can check what is missing in your external library.