June 25, 2022, 07:31:35 am

STM32-E407 Ethernet Speed

Started by emanuelcsm, November 17, 2014, 06:26:22 pm

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emanuelcsm

Hello,

I purchased a STM32-E407 that did not arrivied yet, but I'm already writing some codes.
I now that Ethernet speed is 100Mbps, but I'd like to know how fast can I send data to a telnet terminal? In another words, what is the real data rate of ethernet port?

Thanks in advance.

JohnS

telnet is by design quite slow.  Try it and see.

John

MBR

Yes, the telnel is slow, because is designed for interactivity (low latency), so it sends lots of small packets with a big overhead. If you want to try with some kind of standard protocols, try FTP or HTTP download of big files (e.g. ISO images). Or use netcat, with /dev/zero as the input on the source side and /dev/null as the output on the destination side.

emanuelcsm

Thanks JohnS and MBR.

I have never transfered data through Ethernet. Only UART using USB/Serial Converters.

What I need to do is read an ADC data and show a graph in a computer (windows unfortunatly), just like an ociloscope.

Can I do it using HTTP on ChibOS? Does any one know where do I find an examples for noob.

PS.: I'm good programmer, not a 100% noob, just don't know anything about Ethernet protocol in embedded aplications.

Thanks in advance

JohnS

November 20, 2014, 10:28:22 am #4 Last Edit: November 20, 2014, 10:32:57 am by JohnS
I don't know about the small details of that OS but Ethernet is faster than UARTs etc.  telnet is pretty slow because that's how it is meant to be (yes the small packets etc, it's for a human watching chars echo on screen).

For fast use UDP else use TCP packets.  Easy to do, tons of source on the net.

HTTP if you want, but it's another layer and adds what?  Probably nothing you want.

Er... did you know there's a logic analyser using STM32F4 (with SUMP)?  It's here http://jjmz.free.fr/?p=148
Might give some ideas.

John

emanuelcsm

Thanks JohnS

It helped a lot, now I have a solid point to start.

Thanks