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Like all software libraries, we need to import our LCD library in Keil for us to use its functions. Thus, we will download the necessary files from Sayid Hosseini on GitHub by clicking Code.
Download as a zip file and extract the folder into the STMCubeExpansion folder. Next, we will add the LCD files into Keil. First, we will Add Group at the Project window. Next, scroll down, right click on the New Group created and click on Manage Project Items.
Under Groups, change the New Group name to LCD and click OK.
Right click on the LCD Group and click Add Existing Files to Group 'LCD'. Add in the files LiquidCrystal.c & LiquidCrystal.h inside STM32LiquidCrystal-master folder → src The files should be added into the LCD group as seen below.