W5500 TX Write Pointer calculation

Question

Hello, I have a W5500 configured as a server and the PC is the client. I am having some problems with sending data over tcp and I want to make sure that I compute the Write Pointer properly. Since the Datasheet for the W5500 isn’t so explicit, I took the W5200 Datasheet and tried to set the Write Poiner. The code is the following: // Socket 0 is used uint32_t ptr = getSn_TX_WR(socket_number); uint32_t dst_mask = ptr & get_TxMASK(socket_number); // get_TxMASK(0) returns 0x1FFF uint32_t dst_ptr = get_TxBASE(socket_number) + dst_mask;// get_TxBASE(0) returns 0x8000 Is this the right way to compute the destination pointer(dst_ptr) or am I doing something wrong ? Thank you !

lawrence · Answer

hello, flonas W5500 has different memory structure from W5200. please refer the ioLibrary for W5xxx. GitHub GitHub - Wiznet/ioLibrary_Driver: ioLibrary_Driver can be used for the... ioLibrary_Driver can be used for the application design of WIZnet TCP/IP chips as W5500, W5300, W5200, W5100 W5100S. - GitHub - Wiznet/ioLibrary_Driver: ioLibrary_Driver can be used for the applica... You can check the W5500 memory access. // refer W5500 memory map #define WIZCHIP_TXBUF_BLOCK(n) (2+4*n) // calculate physical memory address and 'addrsel' is for spi interface address and control phase uint16_t ptr = (WIZCHIP_READ(Sn_TX_WR(n)) >> 8) + WIZCHIP_READ(Sn_TX_WR(n)+1) ; uint32_t addrsel = ((uint32_t)ptr << 8) + (WIZCHIP_TXBUF_BLOCK(n) << 3); // copy data to tx memory WIZCHIP_WRITE_BUF(addrsel, data, len); // increase sn_tx_wr ptr += len; WIZCHIP_WRITE(Sn_TX_WR(n), ptr); // send command WIZCHIP_WRITE(Sn_CR(n), Sn_CR_SEND); // send command done while(WIZCHIP_READ(Sn_CR(n))); Thank you lawrence