PV198 - Ethernet
One-chip Controllers
Daniel Dlhopolček, Marek Vrbka, Jan Koniarik, Oldřich Pecák,
Tomáš Rohlínek, Ján Labuda, Jan Horáček, Matúš Škvarla, Ondřej Bleha,
Martin Klimeš, Adam Valt
Faculty of Informatics, Masaryk University
12/2024
Introduction
Intro
Switch the branch to Week_12!
Discussion of HW11
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Ethernet principles
ISO/OSI model
ISO/OSI layers with some protocol examples:
Layer Protocols
7. Application HTTP, SMTP, DNS
6. Presentation FTP, SSH
5. Session
4. Transport TCP, UDP
3. Network IP, ICMP
2. Data MAC
1. Physical Physical structure
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Ethernet principles
IPv4 header
Source: K66 Sub-Family Reference Manual
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Ethernet principles
UDP header
Source: K66 Sub-Family Reference Manual
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FRDM-K66F Ethernet
FRDM-K66F Ethernet
10/100 Mbps Ethernet MAC (ENET)
Compliant with the IEEE802.3-2002 standard
Hardware acceleration block to optimize the performance of
network controllers providing TCP/IP, UDP, and ICMP protocol
services
CRC-32 checking / CRC-32 generation
Programmable MAC address
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FRDM-K66F Ethernet
FRDM-K66F Ethernet
We will use lightweight IP stack lwIP in our embedded application.
Application Lightweight IP stack
Presentation Lightweight IP stack
Session Lightweight IP stack
Transport Lightweight IP stack
Network Lightweight IP stack
Data 10/100 Mbps Ethernet MAC, ENET driver
Physical Micrel 32-pin Ethernet PHY
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FRDM-K66F Ethernet
lwIP
Lightweight IP stack
Specification
Small independent implementation of the TCP/IP protocol suite
– used in embedded
Features: IP, ICMP, UDP, TCP, DNS, DHCP, and more
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Seminar task
Seminar task – Overwiew
The application sends a message to a database
Download it from study materials
It uses UDP packets to send data to InfluxDB
Data are shown with Grafana
http://lavinia.fi.muni.cz:3000/
Login: onechip:onechip
Goto: Student Dashboard
InfluxDB: udp://lavinia.fi.muni.cz:8089/
When you successfully send a message, it will be visible on the
dashboard.
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Seminar task
Seminar task – Template
Initialization of pins, clocks, peripherals and lwIP already
implemented.
Based on UDP echo
When the board receives an UDP packet, it sends the packet back
to the sender.
Uses predefined static IP address.
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Seminar task
Seminar task – Source Code
main:
Initialize pins, clocks, peripherals, lwIP
Send udp packet – your task to implement
Loop: Receive packets
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Seminar task
Seminar task – Task
1. Define your unique IP address (192.168.50.x).
2. Implement function udp_send_data in udpecho_raw.c.
Extra task
Handle received packet – send the packet back to the sender.
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Homework
Voluntary homework
Send meaningful data to the database.
E.g.:
Data from sensor (temperature, pressure, accelerometer, ... )
Logging information (button pressed, ...)
You have to use address.h
This homework is voluntary, you won’t get points for it. You can ask
your teacher for feedback for it.
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