Serial-Ethernet-FW

This project targets the Serial-Ethernet-HW project.

The firmware is built around my STM32X HAL.

Function

This firmware is a simple remote serial port. It is intended to convert some TTL serial SCPI devices into network attached devices.

It provides the following key functionality:

• DHCP support for automatic IP assignment
• A UDP detection port to enable programmatic discovery of the device
• A TCP socket to enable reading and writing to the Serial port

Detection

This is intended to allow a program to discover the address and port of the scpi socket.

This is done by sending a UDP broadcast message from the master:

• Port: 18191
• Data: find_it6300

The device will reply to the sender with the IP address, MAC address and SCPI port.

Example:

192.168.0.100
01-02-03-04-05-06
5025

See Board.h for configuring the detection port and contents.

TCP/Serial

Open a TCP connection to port 5025. Raw TCP messages can be used to read and write to the serial port. The serial port is configured at 38400 8N1 (see Board.h).

Data recieved via TCP will be emitted to the serial port as soon as recieved.

To minimise the number of discrete TCP read/writes, data read on the serial port is chunked before sending TCP messages - using the following rules:

1. Immedately send any buffered data on reception of a \n character.
2. Send all data if 64 or more bytes are buffered.

TODO: No timeout is used, but would be advisable for non SCPI applications.