XIAO RA4M1
Overview
The XIAO RA4M1 integrates Renesas’ RA4M1 chip (32-bit ARM® Cortex®-M4 MCU up to 48 MHz) into the classic XIAO form factor. This development board offers 256KB Flash, 32KB SRAM, 8KB EEPROM, a USB 2.0 connector, reset and boot buttons, 3 LEDs, a 14-bit A/D converter, a 12-bit D/A converter, and a CAN BUS interface. With onboard charging circuitry and low-power modes (as low as 45μA), it’s ideal for battery-powered applications. Sharing the same 32-bit RA4M1 microcontroller as the Arduino Uno R4, it’s natively compatible with Arduino IDE and the extensive XIAO accessories, making it the perfect starting point for electronics projects.
Renesas RA4M1 Microcontroller Group
R7FA4M1AB3CNE
48-pin LQFP package
48 MHz Arm® Cortex®-M4 core with Floating Point Unit (FPU)
32 KB SRAM
256 KB code flash memory
8 KB data flash memory
Connectivity
A Device USB connector for the Main MCU
Pin headers for access to power and signals
Bottom pads for access to signals, SWD, and battery hookup
Operating voltage
External 5 V input through the Debug USB connector supplies the on-board power regulator to power logic and interfaces on the board. External 5 V or 3.3 V may be also supplied through alternate locations on the board.
An external 3.7 V LiPo battery can be connected and the board includes the ability to charge the battery when 5 V power is supplied.
A yellow User LED, controlled by the Main MCU firmware
MCU reset push-button switch
MCU boot push-button switch
Hardware
Detailed hardware features can be found at:
RA4M1 MCU: RA4M1 Group User’s Manual Hardware
XIOA RA4M1 board: XIAO RA4M1 Website
Supported Features
The xiao_ra4m1 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.
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4 CPU1 |
|
ADC |
on-chip |
Renesas RA ADC node1 |
|
Clock control |
on-chip |
Renesas RA Clock Generation Circuit external clock configuration1 |
|
on-chip |
Generic fixed-rate clock provider3 |
||
on-chip |
Renesas RA Sub-Clock1 |
||
on-chip |
Renesas RA Clock Generation Circuit PLL Clock1 |
||
on-chip |
Renesas RA Clock Control node pclk block1 |
||
on-chip |
|||
Counter |
on-chip |
Renesas RA AGT as Counter2 |
|
DAC |
on-chip |
Renesas RA DAC Controller Global1 |
|
on-chip |
Renesas RA DAC Controller1 |
||
GPIO & Headers |
on-chip |
||
on-board |
GPIO pins exposed on Seeeduino Xiao (and compatible devices) headers1 |
||
I2C |
on-chip |
Renesas RA I2C Master controller2 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
Miscellaneous |
on-chip |
||
on-chip |
Renesas RA AGT2 |
||
on-chip |
Renesas RA External Interrupt15 |
||
MMU / MPU |
on-chip |
ARMv7-M Memory Protection Unit (MPU)1 |
|
MTD |
on-chip |
Flash node1 |
|
PHY |
on-chip |
This binding is to be used by all the usb transceivers which are built-in with USB IP1 |
|
Pin control |
on-chip |
The Renesas RA pin controller is a node responsible for controlling pin function selection and pin properties, such as routing a SCI0 RXD to P6101 |
|
PWM |
on-chip |
Renesas RA Pulse Width Modulation8 |
|
RNG |
on-chip |
Renesas RA SCE5 TRNG1 |
|
Serial controller |
on-chip |
||
SPI |
on-chip |
||
SRAM |
on-chip |
Generic on-chip SRAM1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
USB |
on-chip |
Renesas RA USB full-speed controller1 |
|
on-chip |
Renesas RA USB device controller1 |
||
Watchdog |
on-chip |
Renesas RA Watchdog (wdt)1 |
Programming and Debugging
The xiao_ra4m1 board supports the runners and associated west commands listed below.
Applications for the xiao_ra4m1 board can be built, flashed, and debugged
in the usual way. See Building an Application and Run an Application
for more details on building and running.
Flashing
Program can be flashed to XIAO RA4M1 via the built in RA4 USB bootloader.
To flash the program to board
Connect the XIAO RA4M1 USB port to the host.
Enter bootloader mode by holding the right Boot button, and tapping the left Reset button. The Boot button needs to be held for a second or two after the Reset has been released.
Execute west command
# From the root of the zephyr repository
west build -b xiao_ra4m1 samples/hello_world
west flash
Debugging
To debug on the XIAO RA4M1, connect an external debugger to the SWD pads on the bottom of the controller. Once completed, debugging can be performed using Zephyr’s standard method (see Run an Application). The following sample demonstrates how to debug using JLink:
# From the root of the zephyr repository
west build -b xiao_ra4m1 samples/basic/blinky
west debug