Adafruit provides nice open-source libraries for their products. However, they are for Arduino and thus cannot be directly reused for the PIC32. I went through the library and ported it over for the PIC32, in C. I have attached my project file as a .zip file and you can download it to go through the library header and source files, as well as the demo code. I've tried heavily commenting the code so that it is self-explanatory.
As far as hardware goes, with the demo code, the pin connections for the display are:
BL (backlight): I left it unconnected, but you can connect it to 3.3V for backlight.
SCK: connected to RB14 on the PIC
MISO: left unconnected, since I'm not reading anything from the screen
MOSI: connected to RB11 on the PIC
CS: connected to RB1 on the PIC
SDCS: left unconnected as I'm not using the microSD card for this
RST: connected to RB2 on the PIC
D/C: connected to RB0 on the PIC
VIN: connected to 3.3V supply
GND: connected to gnd
The pins I used are defined in the code and you can easily change them as required.
I used my custom proto-board for testing on a breadboard. You can find details here: http://tahmidmc.blogspot.com/2014/02/pic32-proto-board-details-schematic-pcb.html
Here's a video showing the PIC32 running the demo code and doing some simple graphics on the screen. You can see that it runs fairly quickly and quite smoothly.
Project files with all source and header files:
If you have any comments, questions or suggestions, do let me know!