Ive been working on this for about 2 hours now and ive just got it working. Ive tested it by sending 512 bytes of data at 115200 baud and it all seems to work fine. At first the LEDs were flickering really bad but i just had to change the SPWM_FREQ. Im going to start tidying the code up a little and adding my code back in. Hopefully it wont slow it down at all.

Thanx for pointing that out and a big thanks to Darrel for writing it!