W5200 RJ45 cable detection

oodes

Is there any way to detect if a Ethernet cable is plugged into the RJ45 connector in software on the W5200? I want to find out if after i have already established a connection if the cable has been removed so as to flag up an error. After I established the socket and connect and send data, if I remove the cable and I call the method 

sock.connected

or

sock.getStatus

it returns the same value as when the cable is connected

Peter Jakacki

PHYSTATUS register at $0035 bit 5 indicates link up but there isn't any interrupt that I know of for it so you will just have to poll this I guess.

oodes

PHYSTATUS register at $0035 bit 5 


Where can I find this? 

Peter Jakacki

What do you mean? You have read the manual I take it and all I did was search for "link status". But I'm not a very good mind reader so unless you communicate effectively I won't be able to help you much.

oodes

Sorry I didn't mean where in the manual can I find this. I'm using Mike Gebhard's W5200 driver and I wanted to know how to access Bit 5 of the PHYSTATUS register so I can poll the link status. 
I should use :
PRI ReadByte(PSTATUS)   spi.Read(register, 1, @workSpace)  return workSpace[0] & $FF
???

oodes

PUB GetPSTATUS                            'Method in W500 object   return ReadByte(PSTATUS) 
PUB GetPSTATUS                           'Method in Socket object    return wiz.GetPSTATUS
pst.bin(Sock.GetPSTATUS,8)           'Method call in Top Object

With the Ethernet cable connected  or disconnected , all I ever get is '00000000' outputted on the PST
From the Image attached I should be getting a '1' at bit 5 when cable connected right?

Peter Jakacki

I use my own software so I can't really help you with that object but the cable detect relies upon sensing a signal, not the cable itself, which means it needs to be plugged into a hub or something on the other end.

oodes

It is connected to a network switch at the other end , so there is a signal (when connected ) . I can close the socket , and try to open it again which will tell me if the cable is connected or not but that would be more cumbersome approach

Peter Jakacki

Well all I can tell you is that this register works correctly, I report it as "link up".

oodes

Ok, sure thanks anyway.

MJHanagan

I happened across this thread since I am having some internet connectivity issues with my own W5200. In case you haven't figured out how to get access to the PHY status byte I shared my SPIN code below. I also needed to change the ReadByte procedure in the W5200 object (wiz. in my code below) from PRI to PUB so my code could get access.

I just tried it and sure enough bit 5 is set when the cable is connected to my router and not set if there is no connection. There must be connectivity (of some kind) with the router because just having a unconnected cable inserted in the connector results in a 0 bit.

I hope this helps.

' Read and display the physical status byte on the W5200
  iTemp := wiz.ReadByte( $35 )
  pst.str(string( 13, "W5200 PHY status register: %"))
  pst.bin( iTemp, 8 )

  IF iTemp & %00100000 > 0
    pst.str(string( " Link is UP."))
  ELSE
    pst.str(string( " Link is DOWN.")) 

oodes

Thanks for the code snippet , I'll give it a try . I could never manage to get a 1 at bit 5 with a disconnected cable.
I ended up closing the connection and re-opening as a cable check which is a bit cumbersome. I'm away on holidays but ill give it a go when I get back and let you know if it works.

Appreciate the help MJ

Des

oodes

Tried this today and it worked.
Cheers MJ ,