========================== Seeed Studio XIAO RP2350 ========================== The `Seeed Studio XIAO RP2350 `_ is a general purpose board supplied by Seeed Studio and it is compatible with the Rapiberry RP2350 ecosystem, sharing the same MCU as Rapiberry Pi Pico 2. .. figure:: xiao-rp2350.jpg :align: center Features ======== * Raspberry Pi RP2350, ARM® Dual Cortex-M33 @ 150MHz, FPU * 520kB SRAM, 2MB Flash * Security: OTP, Secure Boot, Arm TrustZone * USB Type-C interface * 19 Pins:3x Analog,19x Digital, 2x I²C, 2x UART, 2x SPI, All PWM * 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. The board can be configured to use the USB connection as the serial console. User LED ======== The USER LED, the yellow LED on the XIAO RP2350, is connected to GPIO25/D19 according to the schematic diagram. The USER LED will light up when set to a low level and turn off when set to a high level. Buttons ======= The RESET and BOOT buttons can be used to enter bootloader mode by press and hold BOOT buttons and then press and release RESET button. Then, the board will enumerate as a storage device to a computer connected via USB. Saving a .UF2 file to this device will replace the Flash ROM contents on the RP2350. Pin Mapping =========== Pads numbered anticlockwise from USB connector. ===== ========== ========== Pad Signal Notes ===== ========== ========== 0 GPIO26 D0/A0 1 GPIO27 D1/A1 2 GPIO28 D2/A2 3 GPIO5 D3/A3 4 GPIO6 D4/SDA 5 GPIO7 D5/SCL 6 GPIO0 D6/Default TX for UART0 serial console 7 GPIO1 D7/Default RX for UART0 serial console 8 GPIO2 D8/SCK 9 GPIO4 D9/MISO 10 GPIO3 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-rp2350:nsh $ make V=1 2. Connect the Seeed Studio XIAO RP2350, and enter bootloader mode, once the board is detected as a USB Mass Storage Device, copy “nuttx.uf2” into the device. 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). usbnsh ------ Basic NuttShell configuration using CDC/ACM serial (console enabled in USB Port, at 115200 bps). combo ----- This configuration enabled NuttShell via Serial and enabled led, gpio and ws2812 examples: Testing leds: .. code-block:: console $nsh> leds leds_main: Starting the led_daemon leds_main: led_daemon started led_daemon (pid# 3): 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 Testing gpios: ======== ====== ========== PIN/GPIO Mode Device ======== ====== ========== D0/P0.02 Input /dev/gpio0 D2/P0.28 Output /dev/gpio1 D1/P0.03 Input /dev/gpio2 ======== ====== ========== .. code-block:: console nsh> gpio -w 1 /dev/gpio26 Driver: /dev/gpio26 Interrupt pin: Value=0 Verify: Value=0 nsh> gpio /dev/gpio27 Driver: /dev/gpio27 Input pin: Value=0 nsh> gpio /dev/gpio27 Driver: /dev/gpio27 Input pin: Value=1 nsh> gpio -o 1 /dev/gpio28 Driver: /dev/gpio28 Output pin: Value=0 Writing: Value=1 Verify: Value=1 nsh> gpio -o 0 /dev/gpio28 Driver: /dev/gpio28 Output pin: Value=1 Writing: Value=0 Verify: Value=0 Testing ws2812: .. code-block:: console $nsh> ws2812