W5500 - can't open socket

TCP/IP Chip W5500
1

Hi everyone, me need help. I trying write DHCP client for gathering IP address but i can’t open socket in UDP mode (as in any other mode). My steps (between steps has delay ~300ms):

  • Connect Ethernet cable and power up;
  • Hardware reset using RST pin – OK;
  • Read Chip ID register and check value (0x04) – OK;
  • Software reset by write value 0x80 to Mode Register – OK;
  • Wait until RST bit is reset – OK;
  • Check PHYCFGR register value - get 0xBF, link UP – OK (may be);
  • Write 0x0044 value to S0_PORT register – OK;
  • Read value from S0_PORT register and compare with written value (0x0044) – OK;
  • Write 0x02 value to S0_MR for UDP mode – OK;
  • Read value from S0_MR register and compare with written value (0x02) – OK;
  • Write 0x01 value to S0_CR for open socket – OK;
  • Read value from S0_CR register and compare with 0x00 (command accepted) – OK;
  • Read value from S0_SR – always read 0x00. Why?

I tried this steps for all sockets – can’t open no one. I write to registers using 1MHz SPI speed in SPI_MODE0 (MSB first) and Variable Length Data Mode. I tried using Fixed Lingth Data Mode – without changes. I don’t use some library – only direct write to registers using simple SPI driver.

Also i tried setup static IP address (gateway, mask, source IP) and using ping tool for check W5500 working. W5500 answer on ping requests.

Also i noticed strange behavior with RST bit in PHYCFGR register. After write RST bit to 0 it is not never set to 1, LEDs on Ethernet connector is disabled. After write RST bit to 1 using SPI – LEDs on Ethernet connector is blinks. It is nornaly?

Please, help me. I don’t have no idia :(. I have two W5500 and both don’t work.

2

Would it be better to perform software reset and only then try reading the chip ID? I do not think it is much difference, but I would prefer this way.

Good question. Did you set up source MAC address, proper source IP address and mask? Anything in gateway address?

Datasheet does not say it will return back to 1 automatically. It says this bit must be set to 1 after setting it to 0 (for proper PHY operation).

3

Thanks for your reply!

Good question. Did you set up source MAC address, proper source IP address and mask? Anything in gateway address?

Yes, i tried open socket after setup in src IP, mask, gateway and mac address correct values. Ping tool is working and W5500 asnwer on ping requests but socket doesn’t open. I try again and return with results.

I want to get IP & mask using DHCP. W5500 does not working with default src IP, mask, gateway (0x0000)?

4

Sounds like workflow problem. And you are right, MAC address must be sufficient.
Can you please set port number after setting Sn_MR to 2?

5

Sorry, problem was in broken wires for demo board power supply. After resplace wires W5500 work correctly and i can open socket! I should have checked power using oscilloscope before search problem in code. I did school mistake again :slight_smile:

Thanks for help, Eugeny. Have a nice day.