Cassette Flow

Initial setup

1. Setup ESP-IDF, use ESP-IDF v4.3.2
2. Setup ESP-ADF, use latest master version
3. Patch ESP-ADF to enable audio capture from AUX_IN input. In file esp-adf/components/audio_board/lyrat_v4_3/board_def.h change line 49 from:

.adc_input  = AUDIO_HAL_ADC_INPUT_LINE1,        \

to

.adc_input  = AUDIO_HAL_ADC_INPUT_LINE2,        \

Note: After updating git repositories(ESP-IDF or ESP-ADF) or change branch you need update submodules:

In cloned repository directory execute command: git submodule update --init --recursive and rebuild project.

Wi-Fi configuration

1. Create wifi_config.txt in the root of the SD card
2. Add one line in the following format: <WiFIAP>\t<password> (WiFi AP and password separated with TAB on one line)

• or

1. Open main/config.h
2. Set CONFIG_WIFI_SSID and CONFIG_WIFI_PASSWORD to your Wi-Fi AP

Develop/Build/Flash project

1. Open terminal in the project's folder and run to set ESP-IDF environment variables: . $HOME/esp/esp-idf/export.sh
2. Build project: idf.py build
3. Enter upload mode: Manually by pressing both Boot and RST keys and then releasing first RST and then Boot key.
4. Flash project: idf.py flash

Develop/Build project in CLion

1. Open project in CLion
2. Open CLion's terminal and run to set ESP-IDF environment variables: . $HOME/esp/esp-idf/export.sh
3. Edit/update
4. Build project: idf.py build

Minimodem test commands

1. Encode: minimodem --tx 1200 -f wavfile.wav
2. Decode: minimodem -r 1200

CPU load measurement

Enable the following configuration options (idf.py menuconfig) to get CPU load reported to the serial console every 1 second:

CONFIG_FREERTOS_USE_TRACE_FACILITY=y
CONFIG_FREERTOS_USE_STATS_FORMATTING_FUNCTIONS=y
CONFIG_FREERTOS_VTASKLIST_INCLUDE_COREID=y
CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS=y
CONFIG_FREERTOS_RUN_TIME_STATS_USING_ESP_TIMER=y

Setup CLion

1. https://www.jetbrains.com/help/clion/esp-idf.html#cmake-setup

ESP32 LyraT 4.3 board

1. AUX_IN audio quality issue - https://esp32.com/viewtopic.php?t=12407

Connect to bluetooth device

• Get list of aviable bluetooth devices HTTP URL: http://lyra.board.ip/output?device=BT

• Switch output to bluetooth and connect to device 'devicename', HTTP URL: http://lyra.board.ip/output?device=BT&btdevice=devicename

• Switch output to line out, HTTP URL: http://lyra.board.ip/output?device=SP