Core2
Overview
M5Stack Core2 is an ESP32-based development board from M5Stack. It is the successor for the Core module.
M5Stack Core2 features the following integrated components:
ESP32-D0WDQ6-V3 chip (240MHz dual core, 600 DMIPS, 520KB SRAM, Wi-Fi)
PSRAM 8MB
Flash 16MB
LCD IPS TFT 2”, 320x240 px screen (ILI9342C)
Touch screen (FT6336U)
PMU AXP192
Audio NS4168 amplifier (1W-092 speaker)
Vibration motor
RTC BM8563
USB CP2104
SD-Card slot
Grove connector
IMO 6-axis IMU MPU6886
MIC SPM1423
Battery 390mAh 3,7V
Functional Description
The following table below describes the key components, interfaces, and controls of the M5Stack Core2 board.
Key Component |
Description |
Status |
|---|---|---|
ESP32-D0WDQ6-V2 module |
This MPU-ESP32 module provides complete Wi-Fi and Bluetooth functionalities and integrates a 16-MB SPI flash. |
supported |
32.768 kHz RTC |
External precision 32.768 kHz crystal oscillator serves as a clock with low-power consumption while the chip is in Deep-sleep mode. |
supported |
Status LED |
One user LED connected to the GPIO pin. |
supported |
USB Port |
USB interface. Power supply for the board as well as the communication interface between a computer and the board. Contains: TypeC x 1, GROVE(I2C+I/O+UART) x 1 |
supported |
Reset button |
Reset button |
supported |
Power Switch |
Power on/off button. |
supported |
LCD screen |
Built-in LCD TFT display (LCD-ILI9342C, 2”, 320x240 px) controlled via SPI interface |
supported |
SD-Card slot |
SD-Card connection via SPI-mode. |
supported |
6-axis IMU MPU6886 |
The MPU-6886 is a 6-axis motion tracker (6DOF IMU) device that combines a 3-axis gyroscope and a 3-axis accelerometer. For details please refer to M5Stack-Core2 base shield |
supported |
Grove port |
Note: Grove port requires 5V to be enabled via |
supported |
Built-in microphone |
The SPM-1423 I2S driven microphone. |
todo |
Built-in speaker |
1W speaker for audio output via I2S interface. |
todo |
Battery-support |
Power supply via battery is supported automatically. But there is no possibility to query current battery status. |
todo |
Power supply
M5Stack Core2 module is equipped with the feature-rich power management IC
(x-powers,axp192-regulator).
Following regulators are utilized on this module:
vdd_mcu: Main power supply for the MCU.
lcd_bg: Display backlight voltage.
v_peri: Periphal supply. This regulator controls supply for the display, SD-Card.
vib_motor: Vibration motor regulator.
bus_5v BUS_5V supply for Grove port. Note: This fixed regulator supply is disabled by default.
These voltages can be controlled via regulator api.
Supported Features
The Zephyr m5stack_core2 board configuration supports the following hardware features:
Interface |
Controller |
Driver/Component |
|---|---|---|
NVIC |
on-chip |
nested vector interrupt controller |
UART |
on-chip |
serial port-polling; serial port-interrupt |
PINMUX |
on-chip |
pinmux |
GPIO |
on-chip |
gpio |
I2C |
on-chip |
i2c |
SPI |
on-chip |
spi |
CLOCK |
on-chip |
reset and clock control |
COUNTER |
on-chip |
rtc |
WATCHDOG |
on-chip |
independent watchdog |
PWM |
on-chip |
pwm |
ADC |
on-chip |
adc |
DAC |
on-chip |
dac |
die-temp |
on-chip |
die temperature sensor |
Start Application Development
Before powering up your M5Stack Core2, please make sure that the board is in good condition with no obvious signs of damage.
System requirements
Prerequisites
Espressif HAL requires WiFi and Bluetooth 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.
Building & Flashing
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 m5stack_core2/esp32/procpu samples/hello_world
The usual flash target will work with the m5stack_core2 board
configuration. Here is an example for the Hello World
application.
# From the root of the zephyr repository
west build -b m5stack_core2/esp32/procpu samples/hello_world
west flash
The baud rate of 921600bps is set by default. If experiencing issues when flashing,
try using different values by using --esp-baud-rate <BAUD> option during
west flash (e.g. west flash --esp-baud-rate 115200).
You can also 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! m5stack_core2
Debugging
M5Stack Core2 debugging is not supported due to pinout limitations.