Fixed various bugs that affected memory writes

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Changed RGB references to GRB

Signed-off-by: Matt Ranostay <mranostay@gmail.com>
Various bugfix for PRU1 code to make it actually work

Signed-off-by: Matt Ranostay <mranostay@gmail.com>