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How to use the Tiva API drivers

Other Parts Discussed in Thread: TM4C123GH6PM, SW-TM4C

Hi there. I think most of you will probably think this is a really stupid question but I here's what I am trying to do. I want to use the SSI API functions to make an SPI communication interface.

Just some information: I am using Keil UVision 5 and I am using the Tiva C Series board with the TM4C123GH6PM microcontroller. 

I downloaded the 'SW-TM4C: TivaWare for C Series Software (Complete)' from the Tiva website which "Includes royalty-free libraries (Peripheral, USB, Graphics, Sensor) and kit-/peripheral-specific code examples for all TM4C devices." I added the ssi.h and ssi.c files to my project directory, but when I put the ' #include "ssi.h" ' at the top, it returns an error saying " fatal error in include chain (ssi.h): Unknown type name "unint_t32" ".

I know it's something silly and basic that I haven't done but I've searched for ages on how to utilise these libraries and I just can't find anything that tells me