See the top level README for information on where to find documentation
for the raspberry pi and the ARM processor inside.  Also find information
on how to load and run these programs.

This is a simple uart example for the pi zero.

Okay this was incredibly painful.  I might have saved a few hours if
was at the office with an oscilloscope, I eventually had to fashion
something to look at the output using an mbed.

The documentation for the chip has some glaring errors.  The IER and
IIR register descriptions are screwy.  The one that killed me was
the word length.  The document says that the single bit controls 7
bits per word vs 8 bits per word.  And that bit 1 and some above
do not do anything, they might on real 16550's but not here.  Well
that is wrong.  If bits 1:0 are 00 you get 7 bits if bits 1:0 are 01
you get 7 bits.  You need bit 1 set to get 8 bits.

See the top level README for information about connecting your host
computer to the uart on the raspi.  This is a tx only example.

This example sets up the uart for 115200 baud, and blasts the characters
0123456701234567...forever as fast as it can.