Add support of ESP32-A1S-Audio-kit (AUD-3619)

[zhangtemplar]

It is based on information from

• https://docs.ai-thinker.com/en/esp32-audio-kit
• https://github.com/Ai-Thinker-Open/ESP32-A1S-AudioKit

Tested with examples/player/pipeline_sdcard_mp3_control

Note only two keys (key 1 and key 2) are working.

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[pierluigizagaria]

Thanks for sharing!
Is there anything that can be done to make the other buttons work?

[HengYongChao]

@zhangtemplar

Thanks for your works!

Since the ESP32-A1S-Audio-kit is not an espressif official development board, this PR may need to be discussed.

[pierluigizagaria]

I've tried to checkout at 2.4 version and do a merge with zhangtemplar/master but it's giving me some compilation error after the merge resolve.

../main/voip_app.c: In function 'app_main':
../main/voip_app.c:460:49: error: implicit declaration of function 'INPUT_KEY_DEFAULT_INFO'; did you mean 'ETH_PHY_DEFAULT_CONFIG'? [-Werror=implicit-function-declaration]
     input_key_service_info_t input_key_info[] = INPUT_KEY_DEFAULT_INFO();
                                                 ^~~~~~~~~~~~~~~~~~~~~~
                                                 ETH_PHY_DEFAULT_CONFIG
../main/voip_app.c:460:49: error: invalid initializer
../main/voip_app.c:476:58: error: 'INPUT_KEY_NUM' undeclared (first use in this function)
     input_key_service_add_key(input_ser, input_key_info, INPUT_KEY_NUM);
                                                          ^~~~~~~~~~~~~
../main/voip_app.c:476:58: note: each undeclared identifier is reported only once for each function it appears in
../main/voip_app.c:476:58: warning: passing argument 3 of 'input_key_service_add_key' makes integer from pointer without a cast [-Wint-conversion]
In file included from ../main/voip_app.c:24:
D:/Espressif/.espressif/esp-adf/components/input_key_service/include/input_key_service.h:109:125: note: expected 'int' but argument is of type 'input_key_service_info_t *' {aka 'struct <anonymous> *'} esp_err_t input_key_service_add_key(periph_service_handle_t input_key_handle, input_key_service_info_t *input_key_info, int add_key_num);
                                                                                                                         ~~~~^~~~~~~~~~~
cc1.exe: some warnings being treated as errors
ninja: build stopped: subcommand failed.
The terminal process "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -Command ninja " terminated with exit code: 1.

[pierluigizagaria]

Got the voip example working thanks to this PR. The sound quality is horrible. is it normal? is the sound quality acceptable for supported boards?

[zhangtemplar]

@zhangtemplar

Thanks for your works!

Since the ESP32-A1S-Audio-kit is not an espressif official development board, this PR may need to be discussed.

Happy to discuss.

[zhangtemplar]

Got the voip example working thanks to this PR. The sound quality is horrible. is it normal? is the sound quality acceptable for supported boards?

I didn't test the VoIP example. If you have the code, I may test it (it could be very slow as I am doing this for a hobby).

[zhangtemplar]

Thanks for sharing! Is there anything that can be done to make the other buttons work?

I realized it is a malfunction of my board. When I compared my board to other's board of the model, my board lacked some resistor/capacitor for those buttons.

[nicola-lunghi]

Hi this will be really nice to have I have the same board

[nicola-lunghi]

@zhangtemplar I think you should sign the contributor agrement license.
Happy to take this on if it makes this board works I have 3 of them :-)