Spi to ethernet communication.

Question

Hello, We are using the W5500 chip for the spi to Ethernet communication in our project. And i have some doubts regarding the programming of the chip. Do the chip (w5500) requires additional programming? or the spi frame send from the master configures the whole process of the chip? For getting the spi data through the ethernet what all configurations are required? can you explain the basic configurations required with a pseudo code or a flow chart? And whats is the default spi baud rate of the W5500 EVB? if to be changed how can i change the baud rate. Please don’t reply with the library file link on github.

irina · Answer

First, please let me know what use our product name you use. For example, just use W5500 Chip or use W5500 EVB If you use the W5500 EVB , you just compile the project that we support project via github and download the firmware. If you configure the board with W5500, you must send the data as SPI frame of W5500 from MCU.

becky · Answer

The W5500’s SPI supports 80 MHz speed What Ethernet communication do you want? First, you should connect SPI with MCU. And set the Source Network information . image210×578 13.7 KB Also set the socket communication. please refer to 4.3.1, 4.3.2 and 4.4.1 of W5100S data sheet. image656×594 53.7 KB

soorajsuresh80 · Answer

correct me if i am wrong, as per what i undrstood from the data sheet to establish the spi communication and get the data over the ethernet we need to send the data as per the spi frame of the W5500. And this frame is what configures the w5500 . so that should be like this right? first send the frame with the control bit and address phase selecting the Common register and set the ip mac and stuff there. secondly, send other frame with address phase and control phase selecting socket register for protocol slection and all?? is that the way???

teddy · Answer

If you have W5500 EVB, did you execute the examples code? and did you succeed for example code? what’s the example code you execute? did you configure SPI? did you initialize w5500? EX) void SPI_Init() { /* SSP initialization */ Init_SSP_PinMux(); Chip_SSP_Init(LPC_SSP0); Chip_SSP_SetFormat(LPC_SSP0, SSP_BITS_8, SSP_FRAMEFORMAT_SPI, SSP_CLOCK_MODE0); Chip_SSP_SetMaster(LPC_SSP0, true); Chip_SSP_SetBitRate(LPC_SSP0, 10000000); // 10MHz Chip_SSP_Enable(LPC_SSP0); } void W5500_Init() { uint8_t tmp; uint8_t memsize[2][8] = { { 2, 2, 2, 2, 2, 2, 2, 2 }, { 2, 2, 2, 2, 2, 2, 2, 2 } }; Chip_GPIO_SetPinState(LPC_GPIO, 0, 2, true); // SSEL(CS) Chip_GPIO_SetPinState(LPC_GPIO, 0, 22, false); // N_RESET tmp = 0xFF; while(tmp--); Chip_GPIO_SetPinState(LPC_GPIO, 0, 22, true); // N_RESET reg_wizchip_cs_cbfunc(wizchip_select, wizchip_deselect); reg_wizchip_spi_cbfunc(wizchip_read, wizchip_write); /* wizchip initialize*/ if (ctlwizchip(CW_INIT_WIZCHIP, (void*) memsize) == -1) { printf("WIZCHIP Initialized fail.
"); while (1); } }

teddy · Answer

If you succeed SPI initialize or W5500 initialize, you will read VERSIONR resister. what is VERSIONR resister value? VERSIONR resister value must be 0x04. image671×753 87.6 KB

irina · Answer

teddy: If you have W5500 EVB, did you execute the examples code? and did you succeed for example code? what’s the example code you execute? did you configure SPI? did you initialize w5500? Could you please answer me about above question? 80Mhz means SPI Clock that it send from SPI master. Therefore, it is different with SPI baud rate and it is just SPI clock speed. For example, For reading the version register in W5500, it need the 32bits. Assuming no delay between bit, the calculation is as follows. `1/80MHz 32bits = 12.5ns32 =400ns Even though theoretical design speed is 80MHz, the signal in the high speed may be distorted because of the circuit crosstalk and the length of the signal line. The minimum guaranteed speed of the SCLK is 33.3 MHz which was tested and measured with the stable waveform. Please refer to the SPI Application Note which shows the WIZnet test environment and results.

soorajsuresh80 · Answer

this is the code i wrote for the spi communication from tms320f28335 to w5500 spi to ethernet module. please check if the code is correct and correct me if i am wrong . if am wrong please help me with a pseudo code for the same //########################################################################### #include “DSP28x_Project.h” // Device Headerfile and Examples Include File // Prototype statements for functions found within this file. // __interrupt void ISRTimer2(void); typedef unsigned char uint8; void delay_loop(void); void spi_xmit(uint8 a); void spi_fifo_init(void); void spi_init(void); void error(void); void netwrkconfig(void); void socketinit(void); void portnum(void); void opencmd(void); void listencmd(void); void txdata(void); void sendcmd(void); uint8 sdata; void main(void) { // send data //Uint16 rdata; // received data // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks InitSysCtrl(); // Step 2. Initialize GPIO: // InitSpiaGpio(); // Step 3. Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts DINT; // Initialize PIE control registers to their default state. // The default state is all PIE interrupts disabled and flags // are cleared. // This function is found in the DSP2833x_PieCtrl.c file. InitPieCtrl(); // Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0000; // Initialize the PIE vector table with pointers to the shell Interrupt // Service Routines (ISR). // The shell ISR routines are found in DSP2833x_DefaultIsr.c. // This function is found in DSP2833x_PieVect.c. InitPieVectTable(); // Step 4. Initialize all the Device Peripherals: // This function is found in DSP2833x_InitPeripherals.c spi_fifo_init(); // Initialize the Spi FIFO spi_init(); // init SPI // Step 5. User specific code: // Interrupts are not used in this example. for(; { // Transmit data GpioDataRegs.GPBCLEAR.bit.GPIO57 =1; // SCS asserted low for data transmission netwrkconfig()…

soorajsuresh80 · Answer

teddy: Why you didn’t use iolibrary for WIZNET? Hello, Am using the Ti’s tms320f28335 as Master . and i think no such library are available for that. If so there must a way to init and configure the w5500 right??

soorajsuresh80 · Answer

irina_kim: If yes,where is the address of SIPR in code? as the address is auto incremented for each data , i gave only the starting address of GAR. (my mistake ). as of now i changed that. and made some more modifications in the code. I’ll post code below please check if any changes is required.

soorajsuresh80 · Answer

irina_kim: If yes,where is the address of SIPR in code? void main(void) { // send data //Uint16 rdata; // received data // Step 1. Initialize System Control: // PLL, WatchDog, enable Peripheral Clocks InitSysCtrl(); // Step 2. Initialize GPIO: // InitSpiaGpio(); // Step 3. Clear all interrupts and initialize PIE vector table: // Disable CPU interrupts DINT; // Initialize PIE control registers to their default state. // The default state is all PIE interrupts disabled and flags // are cleared. // This function is found in the DSP2833x_PieCtrl.c file. InitPieCtrl(); // Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0000; // Initialize the PIE vector table with pointers to the shell Interrupt // Service Routines (ISR). // The shell ISR routines are found in DSP2833x_DefaultIsr.c. // This function is found in DSP2833x_PieVect.c. InitPieVectTable(); // Step 4. Initialize all the Device Peripherals: // This function is found in DSP2833x_InitPeripherals.c spi_fifo_init(); // Initialize the Spi FIFO spi_init(); // init SPI // Step 5. User specific code: // Interrupts are not used in this example. for(; { // Transmit data GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; MR_reg (); GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 =1; // SCS asserted low for data transmission GAR(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; // SCS asserted high to inidcate end of the frame. GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; SUBR(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; SHAR(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; SIPR(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; Sn_MR(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 =1; Sn_PORT(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; opencmd(); GpioDataRegs.GPBSET.bit.GPIO57 = 1; GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; Sn_DIPR()…

soorajsuresh80 · Answer

while reading PHY link am getting the value as link down this is the frame i used to read the phy link status void PHYCFGR() { sdata = 0x00; spi_xmit(sdata); sdata = 0x2E; spi_xmit(sdata); sdata = 0x00; spi_xmit(sdata); }

teddy · Answer

Hello Please tell me about the problem with the program. We can’t check all the codes.

soorajsuresh80 · Answer

Hello Teddy, the spi communication is working fine as i read the version register value i got the correct value. but theTCP connection is not working. Also when i reads the PHYCFGR the link status bit shows as link down.

teddy · Answer

Hello If the SPI communication is fine, check hardware connected. Check Lan cable connected PC or router. Check the LED light of the Ethernet connector. Check your schematic. check your Ethernet connector has a transformer. Thank you

soorajsuresh80 · Answer

basically this is what i did , 1,Set MR reg value to 0x08; //for initializing the internal regs as per the datasgeet 2,wait for the MR reg to clear to 0x00 ; 3,Set IP MAC and GHAR; 4,Set Sn_MR value to 0x01; //TCP protocol 5,Set DPORT DIP ; 6; Issue open command 7,Delay 8Issue connect command. But the problem is that am stuck at step 2. MR reg is not clearing to 0x00

Eugeny · Answer

soorajsuresh80: 1,Set MR reg value to 0x08; //for initializing the internal regs as per the datasgeet Why do you think bit 3 will clear itself? I suspect you must write 0x80 to software reset the chip, and not 0x08. soorajsuresh80: 7,Delay There must not be a delay, there must be a controlled loop instead to wait until CR clears (=command acceptted).

soorajsuresh80 · Answer

Thanks Eugeny for the help, My mistake…, Actually i did write the value as 0x80 in the code. It was a mistake in my post. Even reading the version register is giving me wrong value. I don’t know whats happening. this is the frame i used to read the version register GpioDataRegs.GPBCLEAR.bit.GPIO57 = 1; // clearing the SCSn to initiate transmission of data sdata = 0x00; //address phase1 spi_xmit(sdata); sdata = 0x39; //address phase2 spi_xmit(sdata); sdata = 0x00; //Control phase spi_xmit(sdata); sdata = 0x00; spi_xmit(sdata); GpioDataRegs.GPBSET.bit.GPIO57 =1; // setting high the SCSn to end transmission of data

soorajsuresh80 · Answer

Reading the version register is giving me the values like 0x01FF . I don’t know whats going wrong in here.

soorajsuresh80 · Answer

could someone please reply? I have been trying on this for 2 months

soorajsuresh80 · Answer

Thanks for the help, What could go wrong in here? I mean for reading the version register what all initialization is required? can you tell me that by a pseudo code ?

irina · Answer

The first thing you do is confirm the connection master and slave as below figure. The second thing you do is send the right W5500 SPI frame whether or not. irina_kim: You have to set CSn as ‘0’ before SPI data send and if you sent all data, you have to set CSn as ‘1’.