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I have a STM32 uC that has an internal Ethernet controller.

If I want to use LAN I just buy some cheap PHY chip, RJ45 socket and it works.

What If I want Wi-Fi? Is there any chip that can be placed as PHY to work with STM32 MAC Ethernet interface?

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    \$\begingroup\$ No, the protocol is different. \$\endgroup\$ – pjc50 Mar 16 '17 at 13:14
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    \$\begingroup\$ How about esp8266 modules? They come for approx 2 USD and has everything that you need. Besides this, you get a uC clocked at 80/160 MHz, few gpio and some peripherals like UART and i2c. \$\endgroup\$ – Whiskeyjack Mar 16 '17 at 14:15
  • \$\begingroup\$ Or you can use an ESP01 as a AT command controlled WiFi module and connect it to your STM32 via UART. \$\endgroup\$ – Bence Kaulics Mar 16 '17 at 15:34
  • \$\begingroup\$ Can I buy somewhere only esp8266 chip? Not module, but sole chip? I don't want solder module to my PCB, I would rather integrate it as part of my PCB, but all I can see are only modules... Beside I need it to be fast, so UART is out of question. I will have a lot of measurements data to send. \$\endgroup\$ – zupazt3 Mar 16 '17 at 17:12
  • \$\begingroup\$ Ok, nevermind, I have found the chip. Hope I it fast enough. \$\endgroup\$ – zupazt3 Mar 16 '17 at 17:34
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No.

The MII interface used to connect an Ethernet PHY to your STM32 microcontroller is specific to 10/100 Mbit Ethernet. It cannot be used for other types of devices.

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    \$\begingroup\$ Well, but in the end 2nd OSI layer (MAC) is transported by WiFi. I mean I you watch your WiFi in your PC by Wireshark you will see regular Ethernet frames. Maybe there is a chip to convert from MII to WiFi, with SPI (or like) configuration of WiFi (selecting networks, passwords etc). \$\endgroup\$ – zupazt3 Mar 16 '17 at 17:20

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