Espressif ESP32-S3
The ESP32-S3 is a series of single and dual-core SoCs from Espressif based on Harvard architecture Xtensa LX7 CPUs and with on-chip support for Bluetooth and Wi-Fi.
All embedded memory, external memory and peripherals are located on the data bus and/or the instruction bus of these CPUs. With some minor exceptions, the address mapping of two CPUs is symmetric, meaning they use the same addresses to access the same memory. Multiple peripherals in the system can access embedded memory via DMA.
On dual-core SoCs, the two CPUs are typically named “PRO_CPU” and “APP_CPU” (for “protocol” and “application”), however for most purposes the two CPUs are interchangeable.
Toolchain
You can use the prebuilt toolchain for Xtensa architecture and OpenOCD for ESP32-S3 by Espressif.
For flashing firmware, you will need to install esptool.py by running:
$ pip install esptool
Building from source
You can also build the toolchain yourself. The steps to build the toolchain with crosstool-NG on Linux are as follows
$ git clone https://github.com/espressif/crosstool-NG.git
$ cd crosstool-NG
$ git submodule update --init
$ ./bootstrap && ./configure --enable-local && make
$ ./ct-ng xtensa-esp32s3-elf
$ ./ct-ng build
$ chmod -R u+w builds/xtensa-esp32s3-elf
$ export PATH="crosstool-NG/builds/xtensa-esp32-elf/bin:$PATH"
These steps are given in the setup guide in ESP-IDF documentation.
Flashing
Firmware for ESP32-S3 is flashed via the USB/UART or internal USB DEVICE JTAG interface using the
esptool.py tool.
It’s a two step process where the first converts the ELF file into a ESP32-S3 compatible binary
and the second flashes it to the board. These steps are included into the build system and you can
flash your NuttX firmware simply by running:
$ make flash ESPTOOL_PORT=<port>
where <port> is typically /dev/ttyUSB0 or similar. You can change the baudrate by passing ESPTOOL_BAUD.
Bootloader and partitions
ESP32-S3 requires a bootloader to be flashed as well as a set of FLASH partitions. This is only needed the first time
(or any time you which to modify either of these). An easy way is to use prebuilt binaries for NuttX from here. In there you will find instructions to rebuild these if necessary.
Once you downloaded both binaries, you can flash them by adding an ESPTOOL_BINDIR parameter, pointing to the directory where these binaries were downloaded:
$ make flash ESPTOOL_PORT=<port> ESPTOOL_BINDIR=<dir>
Note
It is recommended that if this is the first time you are using the board with NuttX that you perform a complete SPI FLASH erase.
$ esptool.py erase_flash
Peripheral Support
The following list indicates the state of peripherals’ support in NuttX:
Peripheral |
Support |
NOTES |
|---|---|---|
GPIO |
Yes |
|
UART |
Yes |
|
SPI |
Yes |
|
I2C |
No |
|
CAN/TWAI |
No |
|
DMA |
Yes |
|
Wifi |
No |
|
SPIFLASH |
Yes |
|
SPIRAM |
Yes |
|
Timers |
Yes |
|
Watchdog |
Yes |
|
RTC |
No |
|
RNG |
No |
|
AES |
No |
|
eFuse |
No |
|
ADC |
No |
|
Bluetooth |
No |
|
SDIO |
No |
|
SD/MMC |
No |
|
I2S |
No |
|
LCD |
No |
|
CAMERA |
No |
|
LED_PWM |
No |
|
RMT |
No |
|
MCPWM |
No |
|
Pulse_CNT |
No |
|
SHA |
No |
|
RSA |
No |
|
USB SERIAL |
Yes |
|
USB OTG |
No |
Memory Map
Address Mapping
BUS TYPE |
START |
LAST |
DESCRIPTION |
NOTES |
|---|---|---|---|---|
To be added |
Embedded Memory
BUS TYPE |
START |
LAST |
DESCRIPTION |
NOTES |
|---|---|---|---|---|
To be added |
Boundary Address (Embedded)
BUS TYPE |
START |
LAST |
DESCRIPTION |
NOTES |
|---|---|---|---|---|
To be added |
External Memory
BUS TYPE |
START |
LAST |
DESCRIPTION |
NOTES |
|---|---|---|---|---|
To be added |
Boundary Address (External)
To be added
Linker Segments
DESCRIPTION |
START |
END |
ATTR |
LINKER SEGMENT NAME |
|---|---|---|---|---|
To be added |