ESP32/sdkconfig.defaults.esp32s2

# =============================================================================
# ESP32-S2 TARGET AND FLASH LAYOUT
# =============================================================================
# Default to ESP32-S2 Generic board profile.
CONFIG_BOARD_ESP32S2_GENERIC=y
CONFIG_ESPTOOLPY_FLASHSIZE_4MB=y
CONFIG_ESPTOOLPY_FLASHSIZE="4MB"

# Use smaller partition table for 4MB flash
CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="components/boards/partitions-4m.csv"

# =============================================================================
# ESP32-S2 MEMORY OPTIMIZATIONS
# =============================================================================
# ESP32-S2 has ~320KB DRAM (vs 520KB on ESP32) - memory optimization is critical
# Binary Size: ~1.3 MB, Free: ~32% of app partition (plenty of room for updates)

# Cache Configuration: Balance between memory and performance
# Default: 8KB I-cache + 8KB D-cache leaves ~304KB for app/heap
# For maximum memory: change D-cache to 0KB (if using SPIRAM) or reduce I-cache
# For maximum performance: change both to 16KB (costs ~16KB more DRAM)
CONFIG_ESP32S2_INSTRUCTION_CACHE_8KB=y
CONFIG_ESP32S2_DATA_CACHE_8KB=y

# =============================================================================
# WIFI/LWIP TUNING FOR ESP32-S2
# =============================================================================
# WiFi buffer optimization
# RX BA window must be ≤ 2 × STATIC_RX_BUFFER_NUM
CONFIG_ESP_WIFI_RX_BA_WIN=12
CONFIG_LWIP_TCP_WND_DEFAULT=34816
CONFIG_LWIP_TCP_SND_BUF_DEFAULT=18432
CONFIG_ESP_WIFI_IRAM_OPT=y
CONFIG_ESP_WIFI_RX_IRAM_OPT=y

# lwIP stack size optimization
CONFIG_LWIP_TCPIP_RECVMBOX_SIZE=64
CONFIG_LWIP_UDP_RECVMBOX_SIZE=32
CONFIG_LWIP_TCP_RECVMBOX_SIZE=32

# =============================================================================
# FREERTOS AND SYSTEM HEAP TUNING
# =============================================================================
# FreeRTOS single-core optimizations
CONFIG_FREERTOS_UNICORE=y
CONFIG_FREERTOS_OPTIMIZED_SCHEDULER=y

# Reduce idle task stack from default 1536 to save DRAM
# Default is 1536 bytes (too much for single-core), 1024 is sufficient
# Can reduce further to 768 if needed, but watch for stack overflow warnings
CONFIG_FREERTOS_IDLE_TASK_STACKSIZE=1024

# Use RTC Fast Memory as heap (adds ~8KB to available heap)
CONFIG_ESP_SYSTEM_ALLOW_RTC_FAST_MEM_AS_HEAP=y

# Increase main task stack if needed (audio/network operations)
CONFIG_ESP_MAIN_TASK_STACK_SIZE=3072

# =============================================================================
# CONSOLE/USB
# =============================================================================
# USB settings
CONFIG_ESP_CONSOLE_USB_CDC=y

# ESP32-S2 is single-core and has less DRAM than ESP32/S3
# Use SPIRAM if available on the board
# CONFIG_SPIRAM=y

# =============================================================================
# USB Audio Class defaults for the current usb_device_uac integration.
# Keep both streams stereo at 48 kHz so the UAC descriptors, feedback,
# and AirPlay USB backend all use the same resampled output rate.
CONFIG_UAC_SPEAKER_CHANNEL_NUM=2
CONFIG_UAC_MIC_CHANNEL_NUM=2
CONFIG_UAC_SAMPLE_RATE=48000

# =============================================================================
# LED Behavior Configuration
CONFIG_LED_STATUS_PLAYING_VU=y
CONFIG_LED_STATUS_PAUSED_BLINK_SLOW=y
CONFIG_LED_STATUS_STANDBY_OFF=y

# LED inversion (active-low logic)
CONFIG_LED_STATUS_INVERT=n
CONFIG_LED_ERROR_INVERT=n

# =============================================================================
# GPIO defaults (adjust for your board - ESP32-S2 has 47 GPIO pins)
CONFIG_LED_STATUS_GPIO=15
CONFIG_I2S_SCK_IO=35
CONFIG_I2S_BCK_IO=33
CONFIG_I2S_WS_IO=16
CONFIG_I2S_DO_IO=18

# ST7789 TFT display support is not enabled by default.
# The display is optional hardware — enabling it configures specific SPI
# GPIO pins which may conflict with other peripherals on your board.
# To enable, add the following to your own sdkconfig.defaults.esp32s2
# or run: idf.py menuconfig -> Display Configuration