UART Design¶

Philipp Wagner

State Machines¶

_images/state-machine.png

Image courtesy Wikipedia

UART¶

Two wire serial connection protocol

Tx wire to transmit
Rx wire to receive

_images/ehw5-uart.jpg

The EHW5 UART: Set to 3.3V!¶

_images/ehw5-uart-top.jpg

UART protocol¶

The UART protocol sends a start bit, 8 data bits and a stop bit

_images/uart-timing-diagram.png

The idle state is high, so start bit is low. The stop bit is high.

_images/uart-example.png

Exercise 4: Hardware¶

_images/uart-wiring.png

The EHW5 UART: Set to 3.3V!¶

_images/ehw5-uart-top.jpg

Exercise 5¶

Two exercises

Build a UART Transmitter (uart directory)
Build a UART Receiver (uart_receiver directory)

The UART to USB will need a suitable terminal program on the PC (Teraterm on PC, screen or miniterm on Mac/Linux).