W5500 SPI not working

Question

Hi, We have made our own W5500 custom board and the SPI is not working, we checked MOSI and MISO on the oscilloscope, but we see only MOSI pulses, the W5500 chip is not responding. And on power ON I am reading chip version. #define W5500_SPI_READ (0x00 << 2) //< SPI interface Read operation in Control Phase unsigned char ucWizRead(unsigned long AddrSel) { unsigned char ret ; CE_HIGH() ; // Chip Deselect _nop(); _nop(); _nop(); CE_LOW() ; // Chip Select _nop(); _nop(); _nop(); // 0x00003900 Chip Version of Address AddrSel |= (W5500_SPI_READ | 0x00) ; // Address Phase + Control Phase vfnSPI_SendByte((AddrSel & 0x00FF0000) >> 16) ; vfnSPI_SendByte((AddrSel & 0x0000FF00) >> 8) ; vfnSPI_SendByte((AddrSel & 0x000000FF) >> 0) ; ret = ucfnSPI_ReceiveByte() ; // Read the response from W5500 chip _nop(); _nop(); _nop(); CE_HIGH() ; // Chip Deselect return ret ; } // Function for Send byte to W5500 void vfnSPI_SendByte ( unsigned char ucData ) { unsigned char ucBitIndex = 0x80 ; unsigned char ucLocal = 0 ; for ( ucLocal = 0 ; ucLocal < 8 ; ucLocal++ ) { if ( ucData & ucBitIndex ) SI_HIGH() ; // starts from MSB and if high will give high pulse else SI_LOW() ; SCK_HIGH() ; // Generate Clock Pulse _NOP(); _NOP() ; _NOP() ; _NOP() ; SCK_LOW() ; ucBitIndex >>= 1 ; } } // Receive function unsigned char ucfnSPI_ReceiveByte () { unsigned char ucData = 0x00, ucLocal, ucBitIndex = 0x80 ; for ( ucLocal = 0 ; ucLocal < 8 ; ucLocal++ ) { if ( IS_SO_HIGH() ) ucData |= ucBitIndex ; // If there is data from W5500 it will make that bit high. SCK_HIGH() ; // Generate Serial Clock Pulse _NOP() ; _NOP() ; _NOP() ; _NOP() ; SCK_LOW() ; ucBitIndex >>= 1 ; } return ucData ; } Please help me! Reference Circuit: ETHERNET PDF.pdf (22.8 KB)

Eugeny · Answer

Please put comments into your source code so that we would not have to guess what you are doing in there. What is the value of " W5500_SPI_READ"? Draw the diagram of what goes to SPI and what you expect to get. Century: but we see only MOSI pulses, the W5500 chip is not responding What do you mean - not responsing?

Eugeny · Answer

Century: We are not getting any signal on MISO line. Any signal?

Century · Answer

Hi sir, As I am requesting Chip version, always getting 0x00, what could be the fault and how to check whether the chip is functioning or not?

Eugeny · Answer

You are not answering the questions asked, and asking more questions instead. How it is possible to help you?

Century · Answer

Sir, I have edited the post by commenting the code. And yes I am not getting any signal on the MISO line.

Century · Answer

Sir, Please help me!

irina · Answer

Eugeny: he questions asked, and asking more questions instead. H Hi~ The MISO of W5500 signal shows Dummy data… If you read the chip version of W5500, you can show Dummy data as below. ---ADDRH-----ADDRL-----OP------DATA MOSI 0x00 0x39 0x00 DUMMY MISO 0x01 0x02 0x03 0x04 Could you please try the test? thanks best regards irina

Century · Answer

Thanks, There was crystal oscillator problem. SPI worked fine. But when I plugged in the Ethernet cable no LED’s are blinking.