User manual

Demonstration

The transmitter starts sending when there is at least one byte to send. A frame is ter-

minated when there is no more data in the input buffer or when the 64th payload byte

has been transmitted. As long as the application keeps providing data to send, the

transmitter will transmit 64 byte frames. If a frame checksum is invalid, the receiver will

try to resynchronize, but the frame contents will be transferred to the UART interface.

The UART configuration for this demonstration is:

• 19200 bps

•8-N-1

• RTS/CTS flow control (hardware)

3.2.4 Stream Demonstration

This demonstration implements a unidirectional link tester to test the power line

communication link.

There are two applications in this demonstration: a transmitter and a receiver. The

transmitter sends a stream of frames with a constant length and payload. The receiver

checks the received frames and displays statistics on the LCD and via the UART. The

following statistics are available:

• TX: Number of frames transmitted in total

• RX: Number of frames received in total

• OK: Number of frames received correctly

• ERR: Number of frames received with errors

• CRC: Number of frames that had CRC errors

• PAY: Number of frames with at least one payload error

• TRU: Number of truncated frames. A frame is truncated if bit synchronization was

lost before the expected number of octets were received.

Each frame (of 128 byte length) is composed of 16 bytes of preamble, 110 bytes of data

and 2 bytes of CRC. The following push buttons can be used to control the

demonstration application:

• S3: Next LCD view

• S6: Previous LCD view

• S4: Clear all counters

The transmitter application has two LCD views:

• Frame statistics: TX count

• Application configuration (carrier frequency, modulation and baud rate)

On reset, the transmitter sends the application configuration summary over the UART

and prints an asterisk (*) symbol on every transmitted frame. After each 16 frames it

prints the total number of frames transmitted so far.

The receiver application has three LCD views:

• Frame statistics: RX, OK and ERR count

• Error statistics: CRC, PAY and TRU count

• Application configuration (carrier frequency, modulation and baud rate)