https://github.com/soypat/ether-swtch

Low level Ethernet stack marshaller/unmarshaller for use in tiny places.
https://github.com/soypat/ether-swtch

Last synced: about 2 months ago
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Low level Ethernet stack marshaller/unmarshaller for use in tiny places.

• Host: GitHub
• URL: https://github.com/soypat/ether-swtch
• Owner: soypat
• License: bsd-2-clause
• Archived: true
• Created: 2021-06-26T22:45:33.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2023-12-27T23:11:50.000Z (about 1 year ago)
• Last Synced: 2024-05-01T16:22:11.771Z (9 months ago)
• Language: Go
• Size: 227 KB
• Stars: 8
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

• awesome-tinygo - ether-swtch - Low level Ethernet/IP/TCP/HTTP stack marshaller/unmarshaller for use in tiny places. (Embedded Systems / Protocol implementations)

README

        
# Archived

No longer maintained.

See seqs for a proper TCP/IP stack implementation: https://github.com/soypat/seqs

# ether-swtch

Low level Ethernet/IP/TCP/HTTP stack marshaller/unmarshaller for use in tiny places.

Below is an example of an HTTP server for the ENC28J60 integrated circuit using TinyGo. Works on the Arduino Mega 2560. Use build tag `-tags=noheap` to reduce heap allocations.

```go

package main

import (

    "net"

    swtch "github.com/soypat/ether-swtch"

    "github.com/soypat/ether-swtch/hex"

)

func main() {

	var (

		// SPI Chip select pin. Can be any Digital pin.

		spiCS = machine.D53

		MAC   = net.HardwareAddr{0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xFF}

		MyIP  = net.IP{192, 168, 1, 5} //static setup is the only one available

	)

	// Configure writer/reader integrated circuit.

	dev := enc28j60.New(spiCS, machine.SPI0)

	err := dev.Init(MAC)

	if err != nil {

		println(err.Error())

	}

	const okHeader = "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\nPragma: no-cache\r\n\r\n"

	timeout := time.Second * 1

	// Spin up HTTP server which responds with "Hello world!"

	swtch.HTTPListenAndServe(dev, MAC, MyIP, timeout, func(URL []byte) (response []byte) {

		return []byte(okHeader + "Hello world!")

	}, printNonNilErr)

}

func printNonNilErr(err error) {

	if err != nil {

		println(err.Error())

	}

}

```

With `noheap` build tag enabled the above program consumes the following memory

```

   code    data     bss |   flash     ram

  22278     765     856 |   23043    1621

```

The program should be small enough to run on the Arduino UNO as well (2k sram, 32k flash).