IO change correction. Better sweep algorithm

Codec example contd.

Codec example added.

Better address choice. Keep register addresses close..

Preliminary dds example

Register read / write over UART based command protocol added.i

Fifo example is corrected with the modified uart driver.

Modified uart example with slightly better drivers

Fifo based loopback example added

Data integrity fix

Much more robust uart driver

Uart engine optimisation

Transmit only uart example added.

Add reset generation from pll lock signal

modified: README.md