StampS3

Board Overview

StampS3

Name:

m5stack_stamps3

Vendor:

M5Stack

Architecture:

xtensa

SoC:

esp32s3

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Overview

M5Stack StampS3 is an ESP32-based development board from M5Stack.

Hardware

It features the following integrated components:

• ESP32-S3FN8 chip (240MHz dual core)

• 512KB SRAM

• 384KB ROM

• 8MB Flash

• Wi-Fi

• Bluetooth

• User-Button

ESP32-S3 Features

ESP32-S3 is a low-power MCU-based system on a chip (SoC) with integrated 2.4 GHz Wi-Fi and Bluetooth® Low Energy (Bluetooth LE). It consists of high-performance dual-core microprocessor (Xtensa® 32-bit LX7), a low power coprocessor, a Wi-Fi baseband, a Bluetooth LE baseband, RF module, and numerous peripherals.

ESP32-S3 SoC includes the following features:

• Dual core 32-bit Xtensa Microprocessor (Tensilica LX7), running up to 240MHz

• Additional vector instructions support for AI acceleration

• 512KB of SRAM

• 384KB of ROM

• Wi-Fi 802.11b/g/n

• Bluetooth LE 5.0 with long-range support and up to 2Mbps data rate

Digital interfaces:

• 45 programmable GPIOs

• 4x SPI

• 1x LCD interface (8-bit ~16-bit parallel RGB, I8080 and MOTO6800), supporting conversion between RGB565, YUV422, YUV420 and YUV411

• 1x DVP 8-bit ~16-bit camera interface

• 3x UART

• 2x I2C

• 2x I2S

• 1x RMT (TX/RX)

• 1x pulse counter

• LED PWM controller, up to 8 channels

• 1x full-speed USB OTG

• 1x USB Serial/JTAG controller

• 2x MCPWM

• 1x SDIO host controller with 2 slots

• General DMA controller (GDMA), with 5 transmit channels and 5 receive channels

• 1x TWAI® controller, compatible with ISO 11898-1 (CAN Specification 2.0)

• Addressable RGB LED, driven by GPIO38.

Analog interfaces:

• 2x 12-bit SAR ADCs, up to 20 channels

• 1x temperature sensor

• 14x touch sensing IOs

Timers:

• 4x 54-bit general-purpose timers

• 1x 52-bit system timer

• 3x watchdog timers

Low Power:

• Power Management Unit with five power modes

• Ultra-Low-Power (ULP) coprocessors: ULP-RISC-V and ULP-FSM

Security:

• Secure boot

• Flash encryption

• 4-Kbit OTP, up to 1792 bits for users

• Cryptographic hardware acceleration: (AES-128/256, Hash, RSA, RNG, HMAC, Digital signature)

Asymmetric Multiprocessing (AMP)

Boards featuring the ESP32-S3 SoC allows 2 different applications to be executed. Due to its dual-core architecture, each core can be enabled to execute customized tasks in stand-alone mode and/or exchanging data over OpenAMP framework. See Inter-Processor Communication (IPC) folder as code reference.

For more information, check the ESP32-S3 Datasheet [1] or the ESP32-S3 Technical Reference Manual [2].

Supported Features

The m5stack_stamps3 board supports the hardware features listed below.

on-chip / on-board

Feature integrated in the SoC / present on the board.

2 / 2

Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.

vnd,foo

Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

m5stack_stamps3/esp32s3/appcpu target

Type	Location	Description	Compatible
CPU	on-chip	Espressif Xtensa LX7 CPU2	espressif,xtensa-lx7
ADC	on-chip	ESP32 ADC2	espressif,esp32-adc
Bluetooth	on-chip	Bluetooth HCI for Espressif ESP321	espressif,esp32-bt-hci
CAN	on-chip	ESP32 Two-Wire Automotive Interface (TWAI)1	espressif,esp32-twai
Clock control	on-chip	ESP32 Clock (Power & Clock Controller Module) Module1	espressif,esp32-clock
Counter	on-chip	ESP32 Counter Driver based on RTC Main Timer1	espressif,esp32-rtc-timer
	on-chip	ESP32 general-purpose timers1 3	espressif,esp32-timer
	on-chip	ESP32 counters4	espressif,esp32-counter
Cryptographic accelerator	on-chip	Espressif ESP32 SHA Hardware Accelerator1	espressif,esp32-sha
	on-chip	Espressif ESP32 family AES Hardware Accelerator1	espressif,esp32-aes
DMA	on-chip	ESP32 GDMA (General Direct Memory Access)1	espressif,esp32-gdma
Flash controller	on-chip	ESP32 flash controller1	espressif,esp32-flash-controller
GPIO & Headers	on-chip	ESP32 GPIO controller2	espressif,esp32-gpio
I2C	on-chip	ESP32 I2C2	espressif,esp32-i2c
I2S	on-chip	ESP32 I2S2	espressif,esp32-i2s
Input	on-chip	ESP32 touch sensor input1	espressif,esp32-touch
Interrupt controller	on-chip	ESP32 Interrupt controller1	espressif,esp32-intc
IPM	on-chip	ESP32 soft inter processor message1	espressif,esp32-ipm
Mailbox	on-chip	ESP32 soft mailbox1	espressif,mbox-esp32
Memory controller	on-chip	ESP32 pseudo-static RAM controller1	espressif,esp32-psram
MTD	on-chip	Flash node1	soc-nv-flash
	on-chip	Fixed partitions of a flash (or other non-volatile storage) memory1	fixed-partitions
Pin control	on-chip	ESP32 pin controller1	espressif,esp32-pinctrl
PWM	on-chip	ESP32 LED Control (LEDC)1	espressif,esp32-ledc
	on-chip	ESP32 Motor Control Pulse Width Modulator (MCPWM)2	espressif,esp32-mcpwm
RNG	on-chip	ESP32 TRNG (True Random Number Generator)1	espressif,esp32-trng
SDHC	on-chip	ESP32 SDHC controller1	espressif,esp32-sdhc
	on-chip	ESP32 SDHC controller slot2	espressif,esp32-sdhc-slot
Sensors	on-chip	ESP32 temperature sensor1	espressif,esp32-temp
	on-chip	ESP32 Pulse Counter (PCNT)1	espressif,esp32-pcnt
Serial controller	on-chip	ESP32 UART3	espressif,esp32-uart
	on-chip	ESP32 UART1	espressif,esp32-usb-serial
SPI	on-chip	ESP32 SPI2	espressif,esp32-spi
SRAM	on-chip	Generic on-chip SRAM2	mmio-sram
USB	on-chip	ESP32 USB-OTG (DWC2 compatible controller)1	espressif,esp32-usb-otg
Video	on-chip	ESP32 LCD CAM Peripheral interface1	espressif,esp32-lcd-cam
Watchdog	on-chip	ESP32 XT Watchdog Timer1	espressif,esp32-xt-wdt
	on-chip	ESP32 watchdog2	espressif,esp32-watchdog
Wi-Fi	on-chip	ESP32 SoC Wi-Fi1	espressif,esp32-wifi

m5stack_stamps3/esp32s3/procpu target

Type	Location	Description	Compatible
CPU	on-chip	Espressif Xtensa LX7 CPU2	espressif,xtensa-lx7
ADC	on-chip	ESP32 ADC2	espressif,esp32-adc
Bluetooth	on-chip	Bluetooth HCI for Espressif ESP321	espressif,esp32-bt-hci
CAN	on-chip	ESP32 Two-Wire Automotive Interface (TWAI)1	espressif,esp32-twai
Clock control	on-chip	ESP32 Clock (Power & Clock Controller Module) Module1	espressif,esp32-clock
Counter	on-chip	ESP32 Counter Driver based on RTC Main Timer1	espressif,esp32-rtc-timer
	on-chip	ESP32 general-purpose timers3 1	espressif,esp32-timer
	on-chip	ESP32 counters4	espressif,esp32-counter
Cryptographic accelerator	on-chip	Espressif ESP32 SHA Hardware Accelerator1	espressif,esp32-sha
	on-chip	Espressif ESP32 family AES Hardware Accelerator1	espressif,esp32-aes
DMA	on-chip	ESP32 GDMA (General Direct Memory Access)1	espressif,esp32-gdma
Flash controller	on-chip	ESP32 flash controller1	espressif,esp32-flash-controller
GPIO & Headers	on-chip	ESP32 GPIO controller2	espressif,esp32-gpio
	on-board	GPIO pins exposed on M5Stack StampS3 module headers1	m5stack,stamps3-header
I2C	on-chip	ESP32 I2C2	espressif,esp32-i2c
I2S	on-chip	ESP32 I2S2	espressif,esp32-i2s
Input	on-chip	ESP32 touch sensor input1	espressif,esp32-touch
	on-board	Group of GPIO-bound input keys1	gpio-keys
Interrupt controller	on-chip	ESP32 Interrupt controller1	espressif,esp32-intc
IPM	on-chip	ESP32 soft inter processor message1	espressif,esp32-ipm
LED strip	on-board	Worldsemi WS2812 LED strip, SPI binding1	worldsemi,ws2812-spi
Mailbox	on-chip	ESP32 soft mailbox1	espressif,mbox-esp32
Memory controller	on-chip	ESP32 pseudo-static RAM controller1	espressif,esp32-psram
MTD	on-chip	Flash node1	soc-nv-flash
	on-chip	Fixed partitions of a flash (or other non-volatile storage) memory1	fixed-partitions
Pin control	on-chip	ESP32 pin controller1	espressif,esp32-pinctrl
PWM	on-chip	ESP32 LED Control (LEDC)1	espressif,esp32-ledc
	on-chip	ESP32 Motor Control Pulse Width Modulator (MCPWM)1 1	espressif,esp32-mcpwm
RNG	on-chip	ESP32 TRNG (True Random Number Generator)1	espressif,esp32-trng
SDHC	on-chip	ESP32 SDHC controller1	espressif,esp32-sdhc
	on-chip	ESP32 SDHC controller slot2	espressif,esp32-sdhc-slot
Sensors	on-chip	ESP32 temperature sensor1	espressif,esp32-temp
	on-chip	ESP32 Pulse Counter (PCNT)1	espressif,esp32-pcnt
Serial controller	on-chip	ESP32 UART1 2	espressif,esp32-uart
	on-chip	ESP32 UART1	espressif,esp32-usb-serial
SPI	on-chip	ESP32 SPI2	espressif,esp32-spi
SRAM	on-chip	Generic on-chip SRAM2	mmio-sram
USB	on-chip	ESP32 USB-OTG (DWC2 compatible controller)1	espressif,esp32-usb-otg
Video	on-chip	ESP32 LCD CAM Peripheral interface1	espressif,esp32-lcd-cam
Watchdog	on-chip	ESP32 XT Watchdog Timer1	espressif,esp32-xt-wdt
	on-chip	ESP32 watchdog1 1	espressif,esp32-watchdog
Wi-Fi	on-chip	ESP32 SoC Wi-Fi1	espressif,esp32-wifi

Functional Description

The following table below describes the key components, interfaces, and controls of the M5Stack StampS3 module.

Key Component	Description	Status
ESP32-S3FN8 module	This MPU-ESP32S3 module provides complete Wi-Fi and Bluetooth functionalities and integrates a 8MB flash.	supported
Status LED	One user LED connected via worldsemi,ws2812-spi interface (led-strip).	supported
USB Port	USB interface. Power supply for the board as well as the communication interface between a computer and the board.	supported
User button	User button (sw0)	supported

Main connector header

The Zephyr m5stack_stamps3 board can be used on various applications. It therefore publishes a header definition to be used in different shields: m5stack,stamps3-header.

M5Stack StampS3 connector header

Following interfaces are being exported for this header:

• m5stack_stamps3_clkout0: PWM output with 2 channels (0 and 2).

• m5stack_stamps3_spilcd: SPI interface for interfacing LCDs. Consists of a CLK, MOSI and CS signal.

• m5stack_stamps3_i2c0 and m5stack_stamps3_i2c1: I2C interfaces (SDA, SCL).

• m5stack_stamps3_uart0: UART interface (RXD, TXD).

• m5stack_stamps3_header: All GPIOs are of course accessible via main header definition.

Pin	Functions	Pin	Functions
1
2
3	m5stack_stamps3_clkout0 - Channel 0
4
5	m5stack_stamps3_spilcd - MOSI
6	m5stack_stamps3_spilcd - CLK
7	m5stack_stamps3_spilcd - CS	28	3V3
8		27	m5stack_stamps3_uart0 - TXD
9	m5stack_stamps3_clkout0 - Channel 2	26
10		25	m5stack_stamps3_uart0 - RXD
11	GND	24
12	m5stack_stamps3_i2c1 - SDA	23
13	5V	22	EN
14	m5stack_stamps3_i2c1 - SCL	21
15	m5stack_stamps3_i2c0 - SDA	20
16		19
17	m5stack_stamps3_i2c0 - SCL	18	GND

Power supply

M5Stack StampS3 requires a single 5V input power supply. The module internally features a DCDC (MUN3CAD01-SC) to generate the 3.3V needed for the MCU.

The EN signal (Pin 22) is an active low signal to enable the 3V3 power supply. If this pin is pulled low this main 3.3V power supply for the MCU will be deactivated. It is internally equipped with a pull-up and can hence be left open if unused.

System Requirements

Binary Blobs

Espressif HAL requires RF binary blobs in order work. Run the command below to retrieve those files.

west blobs fetch hal_espressif

Note

It is recommended running the command above after west update.

Programming and Debugging

The m5stack_stamps3 board supports the runners and associated west commands listed below.

	flash	debug	attach	debugserver	rtt
esp32	✅ (default)
openocd	✅	✅ (default)	✅	✅	✅

Simple Boot

The board could be loaded using the single binary image, without 2nd stage bootloader. It is the default option when building the application without additional configuration.

Note

Simple boot does not provide any security features nor OTA updates.

MCUboot Bootloader

User may choose to use MCUboot bootloader instead. In that case the bootloader must be built (and flashed) at least once.

There are two options to be used when building an application:

1. Sysbuild

2. Manual build

Note

User can select the MCUboot bootloader by adding the following line to the board default configuration file.

CONFIG_BOOTLOADER_MCUBOOT=y

Sysbuild

The sysbuild makes possible to build and flash all necessary images needed to bootstrap the board with the ESP32 SoC.

To build the sample application using sysbuild use the command:

west build -b <board> --sysbuild samples/hello_world

By default, the ESP32 sysbuild creates bootloader (MCUboot) and application images. But it can be configured to create other kind of images.

Build directory structure created by sysbuild is different from traditional Zephyr build. Output is structured by the domain subdirectories:

build/
├── hello_world
│   └── zephyr
│       ├── zephyr.elf
│       └── zephyr.bin
├── mcuboot
│    └── zephyr
│       ├── zephyr.elf
│       └── zephyr.bin
└── domains.yaml

Note

With --sysbuild option the bootloader will be re-build and re-flash every time the pristine build is used.

For more information about the system build please read the Sysbuild (System build) documentation.

Manual Build

During the development cycle, it is intended to build & flash as quickly possible. For that reason, images can be built one at a time using traditional build.

The instructions following are relevant for both manual build and sysbuild. The only difference is the structure of the build directory.

Note

Remember that bootloader (MCUboot) needs to be flash at least once.

Build and flash applications as usual (see Building an Application and Run an Application for more details).

# From the root of the zephyr repository
west build -b <board> samples/hello_world

The usual flash target will work with the board configuration. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b <board> samples/hello_world
west flash

Open the serial monitor using the following command:

west espressif monitor

After the board has automatically reset and booted, you should see the following message in the monitor:

***** Booting Zephyr OS vx.x.x-xxx-gxxxxxxxxxxxx *****
Hello World! <board>

Board variants using Snippets

ESP32 boards can be assembled with different modules using multiple combinations of SPI flash sizes, PSRAM sizes and PSRAM modes. The snippets under snippets/espressif provide a modular way to apply these variations at build time without duplicating board definitions.

The following snippet-based variants are supported:

Snippet name	Description
Flash memory size
flash-4M	Board with 4MB of flash
flash-8M	Board with 8MB of flash
flash-16M	Board with 16MB of flash
flash-32M	Board with 32MB of flash
PSRAM memory size
psram-2M	Board with 2MB of PSRAM
psram-4M	Board with 4MB of PSRAM
psram-8M	Board with 8MB of PSRAM
PSRAM utilization
psram-reloc	Relocate flash to PSRAM
psram-wifi	Wi-Fi buffers in PSRAM

To apply a board variant, use the -S flag with west build:

west build -b <board> -S flash-32M -S psram-4M samples/hello_world

Note

These snippets are applicable to boards with compatible hardware support for the selected flash/PSRAM configuration.

• If no FLASH snippet is used, the board default flash size will be used.

• If no PSRAM snippet is used, the board default psram size will be used.

Debugging

OpenOCD

As with much custom hardware, the ESP32 modules require patches to OpenOCD that are not upstreamed yet. Espressif maintains their own fork of the project. The custom OpenOCD can be obtained at OpenOCD for ESP32 [3].

The Zephyr SDK uses a bundled version of OpenOCD by default. You can overwrite that behavior by adding the -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts> parameter when building.

Further documentation can be obtained from the SoC vendor in JTAG debugging for ESP32 [4].

Here is an example for building the Hello World application.

# From the root of the zephyr repository
west build -b <board> samples/hello_world -- -DOPENOCD=<path/to/bin/openocd> -DOPENOCD_DEFAULT_PATH=<path/to/openocd/share/openocd/scripts>
west flash

You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b <board> samples/hello_world
west debug

M5Stack StampS3 exports a JTAG-interface via Pins 19 (MTCK), 21 (MTDO), 23 (MTDI), 25 (MTMS).

Note

Please note that additional JTAG equipment is needed to utilize JTAG. Refer to the ESP32S3 datasheet and the M5Stack StampS3 documentation for details.

Related Documents

[1]

https://www.espressif.com/sites/default/files/documentation/esp32-s3-wroom-1_wroom-1u_datasheet_en.pdf

[2]

https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf

[3]

https://github.com/espressif/openocd-esp32/releases

[4]

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/jtag-debugging/index.html