Added support for Ethernet PHY KSZ8081/RNB and basic example (IDFGH-4775)

[linkineo]

I derived the driver written for the KSZ8041 to work for the KSZ8081 PHY. Actually required reading the vendor-specific PHY Control Register 1.
Could test it with the basic esp-idf ethernet example and got an IP over DHCP. Tested for 10/100Mbps, Half and Full duplex.
Could test all functions except ksz8081_negotiate(), for which I now only control the auto-negotiation status over the standard bmsr register as Microchip seems to have removed a second register as it was the case for 8041.

[CLAassistant]

All committers have signed the CLA.

[Alvin1Zhang]

Thanks for your contribution.

[RJPoelstra]

I can also confirm that this works.
Is it just me, or are the PHY control bit definitions for 8041 in the reverse order?

[suda-morris]

Well spotted @RJPoelstra! Yes, after I read the datasheet, confirmed that the bit definitions of pc2r_reg_t is wrong, will fix it ASAP

[linkineo]

Added support for using KSZ8081 in protocol examples. Tested with icmp_echo and mqtt/tcp.

[suda-morris]

Thanks for your contribution, we will close it as we have merged your PR in 98a4c70

[brandonros]

Can this be backported to a branch like release/4.3? Arduino doesn't compile without this.

CXX build/arduino/libraries/WiFi/src//ETH.o
/Users/brandonros/Desktop/esp-idf-v4.3/examples/get-started/sample_project/components/arduino/libraries/WiFi/src/ETH.cpp: In member function 'bool ETHClass::begin(uint8_t, int, int, int, eth_phy_type_t)':
/Users/brandonros/Desktop/esp-idf-v4.3/examples/get-started/sample_project/components/arduino/libraries/WiFi/src/ETH.cpp:174:23: error: 'esp_eth_phy_new_ksz8081' was not declared in this scope
             eth_phy = esp_eth_phy_new_ksz8081(&phy_config);
                       ^~~~~~~~~~~~~~~~~~~~~~~
/Users/brandonros/Desktop/esp-idf-v4.3/examples/get-started/sample_project/components/arduino/libraries/WiFi/src/ETH.cpp:174:23: note: suggested alternative: 'esp_eth_phy_new_ksz8041'
             eth_phy = esp_eth_phy_new_ksz8081(&phy_config);
                       ^~~~~~~~~~~~~~~~~~~~~~~
                       esp_eth_phy_new_ksz8041
make[1]: *** [libraries/WiFi/src//ETH.o] Error 1
make: *** [component-arduino-build] Error 2

[linkineo]

My PR was based on 4.3 and compiling.
I also just compiled successfully the get-started/sample_project project.
I don't exactly get your setup, I see you have a componentssubfolder in the sample_projectfolder, which is not how things are organized in 4.3 or master branches (see here). I guess I would need some more details on how to reproduce your setup.

[AzezurRehman]

i am using ksz8061 i don't get ip address with in buit example code ethernet folder basic and i have add connectin as

GPIO17 - PHY_POWER : clock in
GPIO22 - EMAC_TXD1 : TX1
GPIO19 - EMAC_TXD0 : TX0
GPIO21 - EMAC_TX_EN : TX_EN
GPIO26 - EMAC_RXD1 : RX1
GPIO25 - EMAC_RXD0 : RX0
GPIO27 - EMAC_RX_DV : CRS
GPIO23 - SMI_MDC : MDC
GPIO18 - SMI_MDIO : MDIO
GND : GND
3V3 : VCC