Nuttx Guide

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English

中文 (Chinese)
한국어 (Korean)
Мови (Ukrainian)

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Seeed Studio XIAO RA4M1 ​

The Seeed Studio XIAO RA4M1 is a general purpose board supplied by Seeed Studio and it is compatible with the Renesas RA4M1 ecosystem, sharing the same MCU as Arduino R4 Minima (R7FA4M1AB3CFM).

Features ​

  • Renesas RA4M1, ARM® Dual Cortex-M4 @ 48MHz
  • 32kB SRAM, 256KkB Flash, 8KB EEPROM
  • Security: AES128/256
  • USB Type-C interface
  • 19 Pins:14x Analog,19x Digital, 2x IIC, 2x UART, 2x SPI
  • 1 user LED, 1 power LED，1 RGB LED (WS2812)
  • 1 RESET button, 1 BOOT button

Serial Console ​

By default, a serial console appears on pins 6 (TX GPIO) and pin 7 (RX GPIO). This console runs a 115200-8N1.

User LED ​

The USER LED, the yellow LED on the XIAO RA4M1, is connected to P011 according to the schematic diagram.

Buttons ​

The RESET and BOOT buttons can be used to enter "Renesas RA USB Boot" mode by reboot the board with BOOT shorted to GND and press the reset button twice (double click). The board will enumerate as "Renesas RA USB Boot".

Pin Mapping ​

Pads numbered anticlockwise from USB connector.

Pad Signal Notes

0 P014 D0/A0 1 P000 D1/A1 2 P001 D2/A2 3 P002 D3/A3 4 P006 D4/SDA 5 P100 D5/SCL 6 P301 D6/Default TX for UART0 serial console 7 P301 D7/Default RX for UART0 serial console 8 P111 D8/SCK 9 P110 D9/MISO 10 P109 D10/MOSI 11 12 3V3 Ground Power output to peripherals 13 VIN +5V Supply to board

Power Supply ​

The working voltage of the MCU is 3.3V. Voltage input connected to general I/O pins may cause chip damage if it's higher than 3.3V.

Installation ​

  1. Configure and build NuttX:
 git clone https://github.com/apache/nuttx.git nuttx
 git clone https://github.com/apache/nuttx-apps.git apps
 cd nuttx
 make distclean
 ./tools/configure.sh xiao-ra4m1:nsh
 make V=1

2. Connect the Seeed Studio XIAO RA4M1, and enter "Renesas RA USB Boot" mode, then, flash the nuttx.hex file using rfp-cli: (https://www.renesas.com/en/software-tool/renesas-flash-programmer-programming-gui)

Example command:

rfp-cli -device ra -port /dev/ttyACM0 -p ./build/nuttx.hex
  1. To access the console, TX and RX pins must be connected to the device such as USB-serial converter.

Configurations ​

nsh ​

Basic NuttShell configuration (console enabled in UART0, at 115200 bps).

combo ​

This configuration enabled NuttShell via Serial and enabled led and gpio examples:

Testing leds:

nsh> leds
leds_main: Starting the led_daemon
leds_main: led_daemon started

led_daemon (pid# 5): Running
led_daemon: Opening /dev/userleds
led_daemon: Supported LEDs 0x01
led_daemon: LED set 0x01
nsh> led_daemon: LED set 0x00
led_daemon: LED set 0x01
led_daemon: LED set 0x00
led_daemon: LED set 0x01
led_daemon: LED set 0x00
led_daemon: LED set 0x01

Testing gpios:

PIN/GPIO Mode Device

D0/P014 Input /dev/gpio0 D1/P000 Output /dev/gpio1

nsh> gpio /dev/gpio0
Driver: /dev/gpio0
  Input pin:     Value=0
nsh> gpio /dev/gpio0
Driver: /dev/gpio0
  Input pin:     Value=1