TCP/IP Library and PHY number

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Mjscott

• April 01, 2014 13:05

The STM32 can communicate with up to 8 PHY chips on a single MII or RMII interface. At power up the PHY sets itself up based on the state of external pins (pulled up or down). After power up they are placed in their normal conditions (either pulled up or down). To keep the design simple we only attach the configuration pull ups or pull downs. As a result we are loading a PHY number of 1. Since we only have one PHY its number is irrelevant as long as we can talk to it. We need to be able to change the PHY number during initialization. Is that a definable variable?

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  Paul Curtis

  • May 28, 2014 22:51

  You configure the PHY number you'd like to talk to by setting the network interface's phy.addr member and set up an appropriate phy.init_func.  It does sort of matter as the PHY has a given ID and will not respond to anything other than its own ID...

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  Paul Curtis

  • May 28, 2014 22:53

  ...sorry, meant select_phy_fn...

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