2 unstable releases
0.2.0 | Jan 11, 2024 |
---|---|
0.0.0 | Aug 18, 2023 |
#2135 in Embedded development
240KB
4.5K
SLoC
SPE ADIN1110 embassy-net
integration
embassy-net
integration for the Analog ADIN1110
SPI SPE ethernet chips.
What is SPE or Single Pair Ethernet / 10 BASE-T1L
SPE stands for Single Pair Ethernet. As the names implies, SPE uses differential signalling with 2 wires (a twisted-pair) in a cable as the physical medium. SPE is full-duplex - it can transmit and receive ethernet packets at the same time. SPE is still ethernet, only the physical layer is different.
SPE also supports PoDL (Power over Data Line)
, power delivery from 0.5 up to 50 Watts, similar to PoE
, but an additional hardware and handshake protocol are needed.
SPE has many link speeds but only 10 BASE-T1L
is able to reach cable lengths up to 1000 meters in 2.4 Vpp
transmit amplitude.
Currently in 2023, none of the standards are compatible with each other.
Thus 10 BASE-T1L
won't work with a 10 BASE-T1S
, 100 BASE-T1
or any standard x BASE-T
.
In the industry SPE is also called APL (Advanced Physical Layer)
, and is based on the 10 BASE-T1L
standard.
APL can be used in intrinsic safety applications/explosion hazardous areas
which has its own name and standard called 2-WISE (2-wire intrinsically safe ethernet) IEC TS 60079-47:2021
.
10 BASE-T1L
and ADIN1110
are designed to support intrinsic safety applications. The power supply energy is fixed and PDoL is not supported.
Supported SPI modes
ADIN1110
supports two SPI modes. Generic
and OPEN Alliance 10BASE-T1x MAC-PHY serial interface
Both modes support with and without additional CRC.
Currently only Generic
SPI with or without CRC is supported.
NOTE: SPI Mode is selected by the hardware pins SPI_CFG0
and SPI_CFG1
. Software can't detect nor change the mode.
Hardware
- Tested on
Analog Devices EVAL-ADIN1110EBZ
with anSTM32L4S5QII3P
, seespe_adin1110_http_server
for an example. SparkFun MicroMod Single Pair Ethernet Function Board
orSparkFun MicroMod Single Pair Ethernet Kit (End Of Life)
, supporting multiple microcontrollers. Make sure to check if it's a microcontroller that is supported by Embassy!
Other SPE chips
Analog ADIN2111
2 Port SPI version. Can work with this driver.Analog ADIN1100
RGMII version.
Testing
ADIN1110 library can tested on the host with a mock SPI driver.
$ cargo test --target x86_64-unknown-linux-gnu
Benchmark
- Benchmarked on
Analog Devices EVAL-ADIN1110EBZ
, withspe_adin1110_http_server
example.
Basic ping
benchmark
# ping <IP> -c 60
60 packets transmitted, 60 received, 0% packet loss, time 59066ms
rtt min/avg/max/mdev = 1.089/1.161/1.237/0.018 ms
# ping <IP> -s 1472 -M do -c 60
60 packets transmitted, 60 received, 0% packet loss, time 59066ms
rtt min/avg/max/mdev = 5.122/5.162/6.177/0.133 ms
HTTP load generator benchmark with oha
# oha -c 1 http://<IP> -z 60s
Summary:
Success rate: 50.00%
Total: 60.0005 secs
Slowest: 0.0055 secs
Fastest: 0.0033 secs
Average: 0.0034 secs
Requests/sec: 362.1971
Total data: 2.99 MiB
Size/request: 289 B
Size/sec: 51.11 KiB
Dependencies
~2MB
~41K SLoC