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 board configuration supports the following hardware features:

Peripheral	Kconfig option	Devicetree compatible
GPIO	`CONFIG_GPIO`	`gd,gd32-gpio`
Machine timer	`CONFIG_RISCV_MACHINE_TIMER`	`riscv,machine-timer`
Nuclei ECLIC Interrupt Controller	`CONFIG_NUCLEI_ECLIC`	`nuclei,eclic`
PWM	`CONFIG_PWM`	`gd,gd32-pwm`
USART	`CONFIG_SERIAL`	`gd,gd32-usart`
I2C	`CONFIG_I2C`	`gd,gd32-i2c`
DAC	`CONFIG_DAC`	`gd,gd32-dac`
ADC	`CONFIG_ADC`	`gd,gd32-adc`
SPI	`CONFIG_SPI`	`gd,gd32-spi`

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

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