W5500 Fixed Data Mode

Question

Hello, I have recently desinged 5 pic pcb boards with STM32F103 and W5500 chip for TCPIP connection. Unfortunately, I didn’t mind that there is no Library for FDM mode and I have tied SCSn pin to the ground via 10kOhm resistor. I am trying to modified the reference code for write/read functions but the chip does’t work properly. For example, when I write mac address and read it back, it seems like the chip register is storing only the last value. Below you will find the mofication code for FDM 1 byte. Have you any idea what I am doing wrong? void WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len) { WIZCHIP_CRITICAL_ENTER(); WIZCHIP.CS._select(); AddrSel |= (W5500_SPI_WRITE | W5500_SPI_FDM_OP_LEN1); if(!WIZCHIP.IF.SPI._write_burst) // byte operation { for(i = 0; i < len; i++) { WIZCHIP.IF.SPI._write_byte((AddrSel & 0x00FF0000) >> 16); WIZCHIP.IF.SPI._write_byte((AddrSel & 0x0000FF00) >> 8); WIZCHIP.IF.SPI._write_byte((AddrSel & 0x000000FF) >> 0); AddrSel += (1 << 8); WIZCHIP.IF.SPI._write_byte(pBuf[i]); } } …

irina · Answer

image673×690 75.5 KB I think I know that FIXED mode works when it is configured as shown in the picture above. AddrSel += (1 << 8); WIZCHIP.IF.SPI._write_byte((AddrSel & 0x00FF0000) >> 16); WIZCHIP.IF.SPI._write_byte((AddrSel & 0x0000FF00) >> 8); WIZCHIP.IF.SPI._write_byte((AddrSel & 0x000000FF) >> 0); for(i = 0; i < len; i++) { WIZCHIP.IF.SPI._write_byte(pBuf[i]); } I think

basjot · Answer

Hello. Thank you for your reply. Eventually, my code works properly. In your case, I think that AddrSel should increase every time you send a data byte to register as in my code.