stm32f103xx spi + w5500 - Write successful but read returns 0

Question

Hi There, I am trying to get W5500 work as a TCP Server. As initial steps, I first provided a static IP address so that I could test the spi connectivity between stm32f103xx microcontroller and w5500. I have successfully programmed an IP address, Subnet mask, MAC Address and gateway address by using the VDM mode and writing to Common Register 0x0001-0x0012. I pinged the w5500 and got a response and also did an arp -a to check the programmed MAC address. both ping and arp were successful. So far all is good. I have the following issues: Issue 1: Next I tried to read the programmed MAC address that I was able to see using the arp command. I did the following Sent address High = 0x00, address Low = 0x09 and control = 0x00. The SPI mode is 0 and the host configured as the Master. I have activated SPI interrupt. So in the ISR I am checking" if((SPI1->SR & SPI_SR_RXNE) == SPI_SR_RXNE)" for any received data packets. I was expecting to receive the MAC Address but received 0x00 zeros. Next I tried reading the Version so wrote address High = 0x00, address Low = 0x39 and control = 0x00, but again received Zeros. Note: All my write are successful and I receive a 0x01,0x02,0x03. Issue 2: Each time I open socket 0 by writing to Sn_Cr register, I cannot even ping the W5500. I am using 3.3V, Port A PA4,5,6,7 for SPI1 on stm32f103xx. I have connected the interrupt pin of W5500 to PB15. Both port A and port B of stm32f103xx are activated in RCC, AFIO for SPI1 is activated. Any help would be appreciated. Thanks in advance.

Eugeny · Answer

sr2018: but received 0x00 zeros … and I receive a 0x01,0x02,0x03 You must receive 0x01,0x02,0x03 also during read. If you do not, then it means W5500 does not recognize the command. sr2018: Each time I open socket 0 by writing to Sn_Cr register, I cannot even ping the W5500. Sounds like you write to wrong register page (e.g. to common register block).

Eugeny · Answer

Please share scope shot of the communication between MCU and W5500 (in the best case having all 4 waveforms altogeter) for reads and writes.