0
\$\begingroup\$

I have an issue regarding ethernet with an ESP32. I have designed a hardware with an ESP32 and DP83848 phy for ethernet connection.

The problem is I don't get link up from phy.

I am running the ESP32 example code PHY reset pin is 32. This is the log output from the board. It just stops at Ethernet started:

​> V (2958) tcpip_adapter: check: local, if=2 fn=0x400e24d8

[0m

V (2958) tcpip_adapter: call api in lwip: ret=0x0, give sem[0m

V (2958) tcpip_adapter: check: remote, if=2 fn=0x400e24d8

[0m

D (2968) event: running post ETH_EVENT:0 with handler 0x400d3a84 on loop 0x3ffb4f7c[0m

[0;32mI (2978) eth_example: Ethernet Started[0m

I checked the communication between phy and ESP32, this looks good. I tried to read the phy register and below was output. I had used cyclone TCP example code for this. The conclusion is that the phy and the ESP32 are communicating:

Initializing DP83848...

PHY reg: 00: 0x3100

PHY reg: 01: 0x7849

PHY reg: 02: 0x2000

PHY reg: 03: 0x5C90 (this is phy address)

PHY reg: 04: 0x01E1

PHY reg: 05: 0x0000

PHY reg: 06: 0x0004

PHY reg: 07: 0x2001

PHY reg: 08: 0x0000

PHY reg: 09: 0x0000

PHY reg: 10: 0x0000

PHY reg: 11: 0x0000

PHY reg: 12: 0x0000

PHY reg: 13: 0x0000

PHY reg: 14: 0x0000

PHY reg: 15: 0x0000

PHY reg: 16: 0x0000

PHY reg: 17: 0x0000

PHY reg: 18: 0x0000

PHY reg: 19: 0x0000

PHY reg: 20: 0x0000

PHY reg: 21: 0x0000

PHY reg: 22: 0x0100

PHY reg: 23: 0x0021

PHY reg: 24: 0x0000

PHY reg: 25: 0x8021

PHY reg: 26: 0x0904

PHY reg: 27: 0x0000

PHY reg: 28: 0x0000

PHY reg: 29: 0x6011

PHY reg: 30: 0x003F

PHY reg: 31: 0x0000

Now I have to check between RJ45 jack and PHY. I actually don't understand what the issue is, but I am sure it is between the phy and the RJ45 jack.

I have tried the connection with router and PC directly. I also tried using a different LAN cable, but it didn't work

This is the datasheet of the RJ45 jack.

Here's the schematic diagram:

enter image description here

enter image description here

\$\endgroup\$

1 Answer 1

0
\$\begingroup\$

So finally I found the bug, it was oscillator the current lot of oscillator is not good. I just replaced the oscillator from older PCB and this worked.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.