Chapter 4. Software framework
Does ESP32-S2 support eMMC?
CHIP: ESP32-S2
No.
Does ESP32-S2 support SDIO as a slave?
ESP32-S2 has no SDIO interface and does not support SDIO as a slave.
How does ESP32 enable and disable the interrupt for the SDIO slave to receive data?
The data reception of the SDIO slave is related to the state of the mounted buer. After the data is
received, you need to call sdio_slave_recv_load_buf to release the buer. Otherwise, the SDIO host
will not be able to continue to send data to the SDIO slave.
4.4.12 Serial Peripheral Interface (SPI)
Is ESP-WROOM-02D module able to connect SPI ash?
The ESP-WROOM-02D module is a Wi-Fi module based on the ESP8266 chip, which supports com-
munication with external SPI ash devices using SPI interfaces. Specically, the ESP-WROOM-02D
module provides 4 SPI interface pins, GPIO12, GPIO13, GPIO14, and GPIO15. Among these pins,
GPIO12~GPIO14 can be used as the MISO, MOSI, and SCLK pins for the SPI master interface, and
GPIO15 can be used as the CS pin for the SPI slave interface.
To connect an external SPI ash device to the ESP-WROOM-02D module, the MOSI, MISO, SCK,
and CS pins of the SPI ash device should be connected to the GPIO12~GPIO14 and GPIO15 pins
of the ESP-WROOM-02D module. Additionally, the SPI interface needs to be properly congured
and initialized in the rmware to ensure correct communication of ESP8266 with the external SPI ash
device.
It should be noted that the model and capacity of the external SPI ash device should be selected based
on the specic application requirements. In addition, timing characteristics and reliability of the SPI ash
device should be considered to ensure data can be transmitted correctly and stably. Moreover, factors
such as environment noise and physical distance between the SPI ash device and the ESP-WROOM-
02D module should be considered to improve the reliability and performance of the system as much as
possible.
Taking ESP-WROOM-S2 as the slave device and STM32 as MCU, is it possible to download through SPI
interface?
No, we use UART0 to download by default. You can also design OTA support yourself in rmware.
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