======================= 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). .. figure:: xiao-ra4m1.jpg :align: center 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 3V3 Power output to peripherals 12 Ground 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: .. code-block:: console $ 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: .. code-block:: bash rfp-cli -device ra -port /dev/ttyACM0 -p ./build/nuttx.hex 3. 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: .. code-block:: console $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 ======== ====== ========== .. code-block:: console $nsh> gpio /dev/gpio0 Driver: /dev/gpio0 Input pin: Value=0 $nsh> gpio /dev/gpio0 Driver: /dev/gpio0 Input pin: Value=1