Longan Nano

Overview

The Sipeed Longan Nano and Longan Nano Lite is an simple and tiny development board with an GigaDevice GD32VF103 SoC that based on N200 RISC-V IP core by Nuclei system technology. More information can be found on:

Hardware

  • 4 x universal 16-bit timer

  • 2 x basic 16-bit timer

  • 1 x advanced 16-bit timer

  • Watchdog timer

  • RTC

  • Systick

  • 3 x USART

  • 2 x I2C

  • 3 x SPI

  • 2 x I2S

  • 2 x CAN

  • 1 x USBFS(OTG)

  • 2 x ADC(10 channel)

  • 2 x DAC

Supported Features

The longan_nano 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.

The microSD card reader in Longan Nano board is connected to SPI1.

Serial Port

USART0 is on the opposite end of the USB. Connect to TX0 (PA9) and RX0 (PA10).

Programming and debugging

The longan_nano board supports the runners and associated west commands listed below.

flash debug

Building & Flashing

Here is an example for building the Blinky application.

# From the root of the zephyr repository
west build -b longan_nano samples/basic/blinky
west flash

When using a custom toolchain it should be enough to have the downloaded version of the binary in your PATH.

The default runner tries to flash the board via an external programmer using openocd. To flash via the USB port, select the DFU runner when flashing:

west flash --runner dfu-util

Debugging

You can debug an application in the usual way. Here is an example for the Blinky application.

# From the root of the zephyr repository
west build -b longan_nano samples/basic/blinky
west debug