Chapter 2. API Reference
• No (disabled)
CONFIG_ESP32S2_SPIRAM_SUPPORT
Support for external, SPI-connected RAM
Found in: Component config > ESP32S2-specific
This enables support for an external SPI RAM chip, connected in parallel with the main SPI flash chip.
Default value:
• No (disabled)
SPI RAM config Contains:
• CONFIG_SPIRAM_ALLOW_BSS_SEG_EXTERNAL_MEMORY
• CONFIG_SPIRAM_FETCH_INSTRUCTIONS
• CONFIG_SPIRAM_RODATA
• CONFIG_SPIRAM_BOOT_INIT
• CONFIG_SPIRAM_MALLOC_ALWAYSINTERNAL
• PSRAM clock and cs IO for ESP32S2
• CONFIG_SPIRAM_MALLOC_RESERVE_INTERNAL
• CONFIG_SPIRAM_MEMTEST
• CONFIG_SPIRAM_SPEED
• CONFIG_SPIRAM_USE
• CONFIG_SPIRAM_TRY_ALLOCATE_WIFI_LWIP
• CONFIG_SPIRAM_TYPE
CONFIG_SPIRAM_TYPE
Type of SPI RAM chip in use
Found in: Component config > ESP32S2-specific > CONFIG_ESP32S2_SPIRAM_SUPPORT > SPI RAM
config
Available options:
• Auto-detect (SPIRAM_TYPE_AUTO)
• ESP-PSRAM16 or APS1604 (SPIRAM_TYPE_ESPPSRAM16)
• ESP-PSRAM32 or IS25WP032 (SPIRAM_TYPE_ESPPSRAM32)
• ESP-PSRAM64 or LY68L6400 (SPIRAM_TYPE_ESPPSRAM64)
PSRAM clock and cs IO for ESP32S2 Contains:
• CONFIG_DEFAULT_PSRAM_CLK_IO
• CONFIG_DEFAULT_PSRAM_CS_IO
CONFIG_DEFAULT_PSRAM_CLK_IO
PSRAM CLK IO number
Found in: Component config > ESP32S2-specific > CONFIG_ESP32S2_SPIRAM_SUPPORT > SPI RAM
config > PSRAM clock and cs IO for ESP32S2
The PSRAM CLOCK IO can be any unused GPIO, user can config it based on hardware design.
Range:
• from 0 to 33 if CONFIG_ESP32S2_SPIRAM_SUPPORT && CON-
FIG_ESP32S2_SPIRAM_SUPPORT
Default value:
• 30 if CONFIG_ESP32S2_SPIRAM_SUPPORT && CONFIG_ESP32S2_SPIRAM_SUPPORT
Espressif Systems 1099
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