Cannot find esp_camera.c

[thiird]

Hello,
I'm using the esp library (https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_index.json) to test the esp cam on the FreeNove Esp32 cam board.

For that I'm using the CameraWebServer example, which fails on esp_camera_init().

To see what's wrong I want to see the source code, but I can't find esp_camera.c on my computer, which is where that function is implemented.

I tried looking in various folders like .../Documents/Arduino/libraries/ and also in C/Program Files/Arduino/... but no luck.

Can you help me locate the file?

Thanks

[UKHeliBob]

esp_camera_init() is in esp_camera.h

For instance
C:\Users\Bob2\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.16\tools\sdk\esp32\include\esp32-camera\driver\include\esp_camera.h

[kenb4]

If you're using the IDE, after a successful compile, you should be able to hover over the esp_camera_init, and perhaps after waiting a moment or two, you should see a tooltip describing that call. You can right-click and choose Go to Definition, which should open esp_camera.h. Then hover over the file's tab, and a tooltip should show the full file path.

Alternately, hover over the #include statement, and a tooltip should appear and show the full file path.

So this shows the location of the Board's libraries, under Arduino15 (or ~/.arduino15 on Linux and Mac); which is separate from the optional Library files, usually in your sketchbook directory (.../Documents/Arduino/libraries or ~/Arduino/libraries).

The bad news in this case is that the file is under /driver/include. In that directory, there's just esp_camera.h and sensor.h. There is no corresponding implementation, which would likely be a .cpp file, not plain .c. So the implementation is part of the binary blob that can be linked in, but there is no source to examine.

[thiird]

I see, so there is no way ot debugging that code? I just have to try from the outside?
I was hoping to read the source code because the board + cam is literally new, but it doesn't work. I may have possibly set the wrong pin definitions, we will see.

[srnet]

@thiird

FreeNove Esp32 cam

There are reviews and pinouts of the board here;

https://randomnerdtutorials.com/getting-started-freenove-esp32-wrover-cam/

Would have been difficult to carry out a review if there had been a 'bug' in esp_camera.c stopping the board from working.

[sterretje]

@thiird

I see, so there is no way ot debugging that code?

Please read the replies by @UKHeliBob and @kenb4 again; both indicate where the files are (or should be). You will have to dig a little.

Note that on Windows system files might be hidden; you need to configure Windows Explorer to show hidden stuff (somewhere under the options; I'm not a Windows user at the moment).

[kenb4]

Here's the entirety of the esp-camera directory for my M5Stack board, using tree

~/.arduino15/packages/m5stack/hardware/esp32/2.1.1/tools/sdk/esp32/include/esp32-camera
├── conversions
│   └── include
│       ├── esp_jpg_decode.h
│       └── img_converters.h
└── driver
    └── include
        ├── esp_camera.h
        └── sensor.h

4 directories, 4 files

However, if you search the web for esp_camera.h, the first hit I get is the Github repo, espressif/esp32-camera -- and the implementation is there, in the driver directory. It turns out to be esp_camera.c, as you said. They apparently exclude a bunch of stuff as part of their SDK release.

[thiird]

Indeed that is why I'm asking here, I see the .h files and .c implementation online but not locally. With your confirmation I can close the thread.

@srnet My goal was not to find a bug in the esp code, it was simply to see what it does and where it returns the error code, to hopefully get a hint of what I'm doing wrong.

I will go back to the tutorial again and triple check the pin definitions etc.

Thank you all.

[ptillisch]

Hi @thiird. You must configure the "CameraWebServer" for your hardware.

By default the sketch is configured for use with the "ESP-Eye" hardware:

espressif/arduino-esp32/blob/2.0.16/libraries/ESP32/examples/Camera/CameraWebServer/CameraWebServer.ino#L13-L32

That configuration won't work with your hardware.

Change line line 17 in the sketch from this:

#define CAMERA_MODEL_ESP_EYE // Has PSRAM

to this:

//#define CAMERA_MODEL_ESP_EYE // Has PSRAM

Change line 24 in the sketch from this:

//#define CAMERA_MODEL_AI_THINKER // Has PSRAM

To this:

#define CAMERA_MODEL_AI_THINKER // Has PSRAM

After that, upload the sketch to your "Freenove ESP32 CAM" board. Hopefully this time it will work as expected.

[thiird]

Thanks for your detailed post.
I already did all of that, that's why I was trying something else.

I get the error:

rst:0x1 (POWERON_RESET),boot:0x1b (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1344
load:0x40078000,len:13964
load:0x40080400,len:3600
entry 0x400805f0

E (498) camera: Camera probe failed with error 0x105(ESP_ERR_NOT_FOUND)
Camera init failed with error 0x105

Which is very generic...

[ptillisch]

OK, that is unfortunate. I encountered this "Camera probe failed with error 0x105(ESP_ERR_NOT_FOUND)" error when using the example sketch with my own "ESP32-CAM" board and changing the sketch configuration as I described in my previous reply did solve the problem for me.

There is discussion about the the error message here:

Camera probe failed with error 0x105

I discovered the solution that worked for me in one of the comments on that thread. I guess that specific comment won't be useful to you, but maybe you will find something useful in one of the other comments there.