Sipeed Longan Nano

From Stm32World
Jump to navigation Jump to search
Sipeed Longan Nano - top view aligned.jpg

The Sipeed Longan Nano is a development board built around a GD32VF103xx MCU. The GD32VF103xx is a GigaDevice MCU with a RISC-V core and an architecture which generally assembles a STM32 MCU.

This page contains noted on how to get a full featured development environment - including (important dammit!) single step debugging - up and running.

Pinout

Longan nano pinout v1.1.0 w5676 h4000 large.png

DFU

The GD32VF103 on the Longan Nano board, like STM32 MCUs has got a built-in system bootloader, which can be activated by holding down the Boot0 button during reset. Contrary to the STM32F103 on Blue Pill boards, this bootloader appears to support DFU.

Adding a UDEV rule to make it readable:

# make this usb device accessible for users, used in WebUSB
# change the mode so unprivileged users can access it, insecure rule, though
SUBSYSTEMS=="usb", ATTR{idVendor}=="28e9", ATTR{idProduct}=="0189", MODE:="0666"

the device is recognized by dfu-util:

lth@ncpws04:~/tmp/mylifeline$ dfu-util -l
dfu-util 0.9

Copyright 2005-2009 Weston Schmidt, Harald Welte and OpenMoko Inc.
Copyright 2010-2016 Tormod Volden and Stefan Schmidt
This program is Free Software and has ABSOLUTELY NO WARRANTY
Please report bugs to http://sourceforge.net/p/dfu-util/tickets/

Found DFU: [28e9:0189] ver=0100, devnum=23, cfg=1, intf=0, path="2-4.5.3", alt=0, name="@Internal Flash  /0x08000000/128*001Kg", serial="??"

It is working although it is a bit weird they decided to treat the entire flash as one block of 128 kB. According to the User Manual the flash _can_ be erased per 1 kB page.


DIY JTAG

Green Pill as JTAG adapter.jpg

In this case we will be using a home developed development board, the Green Pill as a JTAG programmer. Our Green Pill board is largely compatible with a traditional Blue Pill.


Name Green Pill Longan Nano
TDI PB15 jTDI
TDO PB14 jTDO
TCK PB13 jTCK
TMS PB4 jTMS

Gallery

Miscellaneous Links