PV198 – One-chip Controllers, Ethernet / Dávid Danaj
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PV198 – One-chip Controllers
Ethernet

PV198 – One-chip Controllers, Ethernet / Dávid Danaj
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Content
1.What is Ethernet used for
2.Overview
1.ISO/OSI Model
2.Headers
3.FRDM-K66F Ethernet
4.lwIP
5.Application

PV198 – One-chip Controllers, Ethernet / Dávid Danaj
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What is Ethernet used for
§Connecting embedded devices to a network
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Overview – ISO/OSI Model
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PV198 – One-chip Controllers, Ethernet / Dávid Danaj
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Overview
By David Mudrák (mudrdmz) - Vlastní produkt, CC BY-SA 3.0,
https://commons.wikimedia.org/w/index.php?curid=5181616

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Overview – IPv4 header
K66 Sub-Family Reference Manual, Figure 50-6.

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Overview – UDP header
K66 Sub-Family Reference Manual, Figure 50-11.

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
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Lightweight IP stack

lwIP
§Lightweight IP stack – link
§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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Application – Overview
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§The application sends a message to a Database
§Uses UDP packets, InfluxDB and data are shown with Grafana
§When you successfully send a message, it will be visible on a dashboard
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Application – Template
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§Contains initialization of pins, clocks, peripherals and lwIP
§Works as 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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Application – Source Code
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§Main:
§Configure (pins, clocks, peripherals, lwIP)
§Send udp packet – your task to implement
§Loop:
* Receive packets
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§UDP Callback:
§handle received packet – send the packet back to the sender

Application – Task
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§Define your unique IP address (192.168.0.x)
§Implement method in udpecho_raw.c:
void udp_send_data(const ip4_addr_t dst_addr, uint16_t dst_port, char *msg);
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Homework
§Send meaningful data to the database.
§E.g.:
§Data from sensor (temperature, pressure, accelerometer, … )
§Logging information (button pressed, …)
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