Problem on receiving continuous buffer data from w5500

Question

Hi, I am using w5500 chip with 2kB transmit buffer to send data to PC using TCP protocol. I am able to send some data from PC to w5500 and hence establish a connection, then I receive the buffer data once from wizchip. My expectation was that I should receive the buffer data continuosly but this does not happen and I have to again send some bytes from PC to receive the next buffer content… seems like a new connection, but I do not see any disconnection messages in the wireshark. I do not understand why the buffer data is not being sent continuously… can someone tell me where do I look for the problem!?? I have attached the wireshark data trace… 1110×594 75 KB

randomizer · Answer

could you please share your code for sending and receiving data to/from the PC?

Eugeny · Answer

JoergH: can someone tell me where do I look for the problem!?? Look into the W5500 driving code. Most probably driver is looping looking for incoming data, and incoming data (RX size !=0) triggering driver executing sending code.

JoergH · Answer

[quote=“randomizer”]could you please share your code for sending and receiving data to/from the PC?[/quote] void W5500_Write_TXBuf(unsigned char SocketNr, unsigned char *z, unsigned int len) { unsigned char /z[] =“Hallo ich bin da, wer noch?”,/ i, AdrHi, AdrLo; unsigned int Adr; // z[0]=169; z[1]=254;z[2]=101;z[3]=2;z[4]=0x13;z[5]=0x88;z[6]=0;z[7]=10; TIMER_START(74); #ifdef SEND_BLOCK // (<- BSB ->|<- nR/W ->|<- OP ->, ADRHI, ADRLO) //SPI_Block(CNTRL_Sn(Nr) | CNTRL_TXBUF | CNTRL_WRITE | CNTRL_VDM, AdrHi, AdrLo); // ControlByte // 13 + Rec BYTES SPI_Block(SocketNr); //SPI_BLOCK_MAC(AdrHi, AdrLo, CNTRL_Sn(Nr) | CNTRL_TXBUF | CNTRL_WRITE | CNTRL_VDM); #else // Page 56/65 (WizChip Datasheet 1.0): // Sn_TX_WR // 1. READ THE STARTING...(aka Sn_TX_RD): // Lies Pointer (wohin Daten im Buffer?) // 5 BYTES GPO_ptr[3] = 0x00 | FREQ_BIT | CS_BIT ; // Freq & nCS SPI_Byte(0x00); // 1. AdrByte SPI_Byte(0x22); // 2. AdrByte // (<- BSB ->|<- nR/W ->|<- OP ->) SPI_Byte(CNTRL_Sn(SocketNr) | CNTRL_REG | CNTRL_READ | CNTRL_VDM); // ControlByte AdrHi = SPI_Byte(0xFF); // DummyByte for Read AdrLo = SPI_Byte(0xFF); // DummyByte for Read GPO_ptr[3] = 0x00 | FREQ_BIT ; // Freq ///////////////////////////////////////////////////////// // 2. SAVE THE TRANSMITTING.. (write to Buffer starting @Adr // Schreiben von Sn_TX_RD // 3 BYTES + Rec GPO_ptr[3] = 0x00 | FREQ_BIT | CS_BIT ; // Freq & nCS SPI_Byte(AdrHi); // 1. AdrByte SPI_Byte(AdrLo); // 2. AdrByte // (<- BSB ->|<- nR/W ->|<- OP ->) SPI_Byte(CNTRL_Sn(SocketNr) | CNTRL_TXBUF | CNTRL_WRITE | CNTRL_VDM); // ControlByte Adr = (AdrHi<<8) | AdrLo; #ifdef DEBUG xil_printf(“Sn_TX_WR: Adr = 0x%x %x %x ”, Adr, AdrHi, AdrLo); #endif i=0; while(i>8; AdrLo = (Adr & 0x00FF) ; // 3. AFTER SAVING…