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It's purely domestic.
gd32mcu is a chip from Zhaoyi Innovation.
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GD32 microcontroller refers to a series of microcontroller developed and designed by domestic chip company GigaDevice.
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Founded in 2005 and headquartered in Beijing, China, and successfully listed on the Shanghai Stock Exchange in August 2016, with more than 1,100 employees, Zhaoyi Innovation is a leading fabless semiconductor company dedicated to the development of advanced memory technology, MCU and sensor solutions. With branches and offices in Beijing, Shanghai, Shenzhen, Hefei, Xi 'an, Chengdu, Suzhou, Hong Kong and Taiwan, the United States, South Korea, Japan, the United Kingdom, Germany, Singapore and other countries and regions, the marketing network is spread all over the world to provide customers with high-quality and convenient local support services.