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sdkconfig.defaults

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+# Elecrow CrowPanel 7.0" HMI -- ESP32-S3-WROOM-1-N4R8
+# 4MB flash, 8MB octal PSRAM, 800x480 RGB panel.
+
+CONFIG_IDF_TARGET="esp32s3"
+
+# --- Flash / partitions ---
+CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y
+CONFIG_ESPTOOLPY_FLASHMODE_QIO=y
+CONFIG_ESPTOOLPY_FLASHFREQ_80M=y
+CONFIG_PARTITION_TABLE_CUSTOM=y
+CONFIG_PARTITION_TABLE_CUSTOM_FILENAME="partitions.csv"
+
+# --- CPU ---
+CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ_240=y
+CONFIG_FREERTOS_HZ=1000
+
+# --- PSRAM ---
+# The R8 suffix is 8MB OCTAL PSRAM. QSPI mode will not sustain an 800x480
+# RGB framebuffer; octal at 80MHz is required for a stable panel.
+CONFIG_SPIRAM=y
+CONFIG_SPIRAM_MODE_OCT=y
+# 80MHz. The vendor's Arduino build uses 120MHz, which would give the RGB
+# panel 50% more bandwidth -- but on ESP-IDF 5.3 selecting 120MHz PSRAM raises
+# the shared MSPI core clock and forces flash to 120MHz too. That needs flash
+# High Performance Mode plus a DC-aware bootloader, and getting it wrong
+# leaves the board unbootable. Not worth it; the bounce buffer covers the gap.
+CONFIG_SPIRAM_SPEED_80M=y
+CONFIG_SPIRAM_USE_MALLOC=y
+# Do NOT enable SPIRAM_FETCH_INSTRUCTIONS / SPIRAM_RODATA here. Espressif
+# documents them as incompatible with an RGB panel framebuffer in PSRAM: the
+# LCD DMA and the instruction fetch path contend for the same bus, which
+# blanks the panel and stalls TLS handshakes.
+
+# --- Cache: reduces RGB panel tearing/drift ---
+CONFIG_ESP32S3_DATA_CACHE_64KB=y
+CONFIG_ESP32S3_DATA_CACHE_LINE_32B=y
+
+# --- LCD ---
+CONFIG_LCD_RGB_ISR_IRAM_SAFE=y
+# Re-align the scanout to vsync if it ever does slip.
+CONFIG_LCD_RGB_RESTART_IN_VSYNC=y
+
+# The bounce-buffer ISR faults if the cache is disabled by a flash write while
+# the panel is running. app_main finishes WiFi bring-up before starting the
+# panel; this stops the WiFi stack writing to flash afterwards too.
+CONFIG_ESP_WIFI_NVS_ENABLED=n
+
+# --- WiFi buffer trim ---
+# Frees ~25KB of internal RAM so the LVGL draw buffers fit there rather than
+# in PSRAM. Keeping them out of PSRAM removes a third round trip over the same
+# bus the LCD is streaming from, which is what causes the refill artefacts.
+# This board only polls a small JSON endpoint, so the smaller pools are ample.
+CONFIG_ESP_WIFI_STATIC_RX_BUFFER_NUM=4
+CONFIG_ESP_WIFI_DYNAMIC_RX_BUFFER_NUM=16
+CONFIG_ESP_WIFI_TX_BUFFER_TYPE=1
+CONFIG_ESP_WIFI_DYNAMIC_TX_BUFFER_NUM=16
+CONFIG_ESP_WIFI_AMPDU_TX_ENABLED=n
+CONFIG_ESP_WIFI_AMPDU_RX_ENABLED=n
+
+# --- Console ---
+# Console reaches us over the CH340 UART bridge. The USB-Serial-JTAG
+# peripheral is left off: it is hardwired to GPIO19/20 on the ESP32-S3, which
+# the Basic CrowPanel uses for touch I2C. The Advance uses 15/16 so this is
+# not strictly required here, but nothing needs it and it keeps those pins free.
+CONFIG_ESP_CONSOLE_SECONDARY_NONE=y
+
+# --- TLS ---
+# The LVGL draw buffers take ~62KB of internal RAM, which leaves too little
+# for an mbedTLS session (it fails with MBEDTLS_ERR_SSL_ALLOC_FAILED, -0x7F00).
+# Push TLS allocations to PSRAM and shrink the outgoing content buffer -- the
+# only request this makes is a short GET.
+CONFIG_MBEDTLS_EXTERNAL_MEM_ALLOC=y
+CONFIG_MBEDTLS_SSL_OUT_CONTENT_LEN=4096
+
+# --- LVGL 9 ---
+CONFIG_LV_COLOR_DEPTH_16=y
+CONFIG_LV_USE_LOG=y
+CONFIG_LV_LOG_LEVEL_WARN=y
+CONFIG_LV_FONT_MONTSERRAT_14=y
+CONFIG_LV_FONT_MONTSERRAT_28=y
+CONFIG_LV_FONT_MONTSERRAT_48=y
+
+# --- Main task needs headroom for driver init ---
+CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192