W5500 Fixed Data Mode

TCP/IP Chip W5500
1

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]);
   }

}
…

2

image
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

3

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.