Issues Compiling esp32_fm_synth

[willemcous]

Hello!
Thank you so much for the resources you have provided on esp32 synth projects.
I am very new to this and working on it for my thesis project. I am trying to compile and upload the esp32_fm_synth to my esp32, "ESP32-WROOM-32U," but I am getting an error message
'SERIAL_BAUDRATE' was not declared in this scope

I don't know what to make of this, I followed the steps in your video but maybe there is something wrong with my connection to the board? Sorry if this is a very naive question, I am new to this.

[marcel-licence]

Hello,

I would recommend to try out https://github.com/marcel-licence/ml_synth_fm_example instead. It is the newer version and supports the ESP32 and other platforms.

Please let me know if that works for you

[willemcous]

Thank you for your reply! I have been trying this out for a few days, but I am still getting some errors, though they are different errors. I am now getting this

/Users/willem/Library/Arduino15/packages/esp32/tools/esp-x32/2302/bin/../lib/gcc/xtensa-esp32-elf/12.2.0/../../../../xtensa-esp32-elf/bin/ld: /var/folders/25/77fpz5rx1jq_mctcj4h1by540000gq/T/arduino_build_362567/sketch/ml_synth_fm_example.ino.cpp.o:(.literal._Z10audio_taskv[_Z10audio_taskv]+0x4c): undefined reference to _Z20ScopeOled_AddSamplesPfS_m' /Users/willem/Library/Arduino15/packages/esp32/tools/esp-x32/2302/bin/../lib/gcc/xtensa-esp32-elf/12.2.0/../../../../xtensa-esp32-elf/bin/ld: /var/folders/25/77fpz5rx1jq_mctcj4h1by540000gq/T/arduino_build_362567/sketch/ml_synth_fm_example.ino.cpp.o: in function _Z10audio_taskv':
/Users/willem/Documents/ml_synth_fm_example/ml_synth_fm_example.ino:444: undefined reference to `_Z20ScopeOled_AddSamplesPfS_m'
collect2: error: ld returned 1 exit status

I am not sure what to do, I have tried defining OLED_OSC_DISP_ENABLED in cofig.h, but it makes no difference.

[marcel-licence]

Hello, thank you for your message.
With the latest update it should work.
The test build was successful: https://github.com/marcel-licence/ml_synth_fm_example/actions/runs/11316906436/job/31469860227

Which target did you select?
Did you chance anything else to config.h?

[willemcous]

Thank you so so much! This worked. I really appreciate your help! In the next few days I’m getting a MIDI shield to hook up my keyboard and hopefully it is all good from here, but I may bother you soon with another question. Sorry in advance. Thanks again

…

On Mon, Oct 14, 2024 at 7:34 AM Marcel ***@***.***> wrote: Hello, thank you for your message. With the latest update it should work. The test build was successful: https://github.com/marcel-licence/ml_synth_fm_example/actions/runs/11316906436/job/31469860227 grafik.png (view on web) <https://github.com/user-attachments/assets/2c3b38e0-634f-4963-9efe-0b8463edfe08> Which target did you select? Did you chance anything else to config.h? — Reply to this email directly, view it on GitHub <#58 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATNZRHYCGCEFO26F4YZQWWDZ3OT3TAVCNFSM6AAAAABPSQYO5WVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTAOJTGU2TEOI> . You are receiving this because you authored the thread.Message ID: ***@***.*** .com>

[marcel-licence]

I am happy to hear that it works now.
Feel free to ask =)
I hope I will find some time to update the documentation too

[willemcous]

Hi Marcel!

Thanks for your help and updates.
While we got everything to compile successfully to the ESP-32, we are not getting MIDI in and Sound out. I am not sure how much configuration we are supposed to add?
I targeted the ESP32_DOIT because it is the closest to my ESP32-WROOM-32U, and when that didn't work I added the following lines into the Config file:

#define MIDI_RX_PIN 13
#define I2S_BCLK_PIN 25
#define I2S_WCLK_PIN 27
#define I2S_DOUT_PIN 26

Then we connected those pins to our MIDI Shield and PCM5102A DAC, but still no luck.
We are lost and unsure how to troubleshoot from this point forward, are we missing an obvious step?

Thanks so much for your help, if it would be easier to talk on the phone, I would be happy to if there's a way to connect.

Willem

P.S. Because of all your crucial help, we have decided to name our synth after you, the MARCEL!

[marcel-licence]

Hi Willem,

did you open up the serial monitor? It display the settings on startup.
For audio testing you can define:
#define OUTPUT_SAW_TEST
This should generate a saw wave on I2S independent from the input.

For MIDI testing you can define:
#define MIDI_DUMP_SERIAL2_TO_SERIAL

I would suggest you use the following settings:

#define MIDI_PORT2_ACTIVE
#define MIDI_RX2_PIN 34 /* can be another number */

You can contact me via discord. I would be happy to update the documentation to give a better way to start with the projects for all users.

Oh that is really nice. Interesting name for a synth XD

[marcel-licence]

Discord: https://discord.gg/3vm6HVC7