156 lines
4.3 KiB
ReStructuredText
156 lines
4.3 KiB
ReStructuredText
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===============
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ESP32-AUDIO-KIT
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===============
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The `Ai-Thinker ESP32 Audio Kit <https://docs.ai-thinker.com/en/esp32-audio-kit>`_ is a development board for the ESP32 SoC from Espressif, based on Ai-Thinker ESP32-A1S audio module.
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.. list-table::
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:align: center
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* - .. figure:: esp32-audio-kit.png
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:align: center
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Ai-Thinker ESP32 Audio Kit board
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Features
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========
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- ESP32-A1S module
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- Audio Earphones Output
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- Audio LINEIN Input
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- 2 Microphones in the board (stereo audio input)
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- 8 Buttons in the boards (1 RST Button and 7 user buttons)
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- MicroSD card slot
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Some of the ESP32 I/O pins are broken out to the board's pin header.
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Serial Console
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==============
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UART0 is, by default, the serial console. It connects to the on-board
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Silabs CP2102 converter and is available on the USB connector (UART label).
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It will show up as /dev/ttyUSB[n] where [n] normally is 0 if you don't have
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another USB/Serial adapter connected in your computer.
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Buttons and LEDs
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================
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Board Buttons
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-------------
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There are eight buttons labeled as RST, BOOT, KEY1..KEY6.
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The RST button is not available to software.
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The BOOT button is connected to IO0. On reset it is used as a strapping
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pin to determine whether the chip boots normally or into the serial
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bootloader. After reset, however, the BOOT button can be used for software
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input.
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Board LEDs
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----------
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There are several on-board LEDs for that indicate the presence of power
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and USB activity.
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I/O Mapping
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===========
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===== ========================= ==========
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I/O Signal Notes
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===== ========================= ==========
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0 BOOT Button
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2 DATA0 SDCard
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4 DATA1 SDCard
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5 KEY6 Button
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12 DATA2 SDCard
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13 KEY2 Button/DATA3 SDCard (DIP Switch)
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14 CLK SDCard
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15 CMD SDCard/JTAG MTDO (DIP Switch)
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18 KEY5 Button
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19 KEY3 Button/LED5
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21 CTRL Audio AMP
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22 LED4
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23 KEY4 Button
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34 SDCard Detect
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36 KEY1 Button
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===== ========================= ==========
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Configurations
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==============
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All of the configurations presented below can be tested by running the following commands::
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$ ./tools/configure.sh esp32-audio-kit:<config_name>
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$ make flash ESPTOOL_PORT=/dev/ttyUSB0 -j
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Where <config_name> is the name of board configuration you want to use, i.e.: nsh, buttons, wifi...
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Then use a serial console terminal like ``minicom`` or ``picocom`` configured to 115200 8N1.
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audio
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-----
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This configuration uses the I2S0 peripheral and the ES8388 audio codec
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present on the ESP32-Audio-Kit board to play an audio file streamed over
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HTTP while connected to a Wi-Fi network.
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**Simple HTTP server**
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Prepare a PCM-encoded (`.wav`) audio file with 16 bits/sample (sampled at
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44.1kHz). This file must be placed into a folder in a computer that could
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be accessed on the same Wi-Fi network the ESP32 will be connecting to.
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Python provides a simple HTTP server. `cd` to the audio file folder on the
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PC and run::
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$ python3 -m http.server
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Serving HTTP on 0.0.0.0 port 8000 (http://0.0.0.0:8000/)
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Look for your PC IP address and test playing the prepared audio on your
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browser:
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.. figure:: esp32-audio-config-file.png
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:align: center
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After successfully built and flashed, connect the board to the Wi-Fi network::
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$ nsh> wapi psk wlan0 mypasswd 1
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$ nsh> wapi essid wlan0 myssid 1
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$ nsh> renew wlan0
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Once connected, open NuttX's player and play the file according to its file
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name and the IP address of the HTTP server (For example `tone.wav` and
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`192.168.1.239:8000`, respectively)::
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$ nsh> nxplayer
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$ nxplayer> play http://192.168.1.239:8000/tone.wav
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.. note::
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The codec implementation on the LyraT board was validated using 16-bit,
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44.1kHz WAV files. Other configurations might not work as expected.
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nsh
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---
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Basic NuttShell configuration (console enabled in UART0, exposed via
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USB connection by means of FT2232HL converter, at 115200 bps).
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wifi
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----
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Enables Wi-Fi support. You can define your credentials this way::
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$ make menuconfig
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-> Application Configuration
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-> Network Utilities
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-> Network initialization (NETUTILS_NETINIT [=y])
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-> WAPI Configuration
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Or if you don't want to keep it saved in the firmware you can do it
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at runtime::
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nsh> wapi psk wlan0 mypasswd 3
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nsh> wapi essid wlan0 myssid 1
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nsh> renew wlan0
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