WIZ850io TCP Server data sending mistake

TCP/IP Chip W5500
1

Hello everyone,

I hope you will can help in solving of my problem.
I handle a Wiz850io module in TCP Server mode. I thought that I handle the transmisson well, but revealed that I just thougth that.
My problem is, that I can receive the incomind data from clients well (in ONE packet) but if I send any length data, in the ethernet it will send 1byte mode. Byte to byte, not in one packet.

I handle the sockets inVDM mode so I do not understand, what could be the reason of this operation…

Can anybody help me?
Please, just ask from me any more information for the soonest solving of this situation :slight_smile:

2

Do you use the iolibrary- driver we provide?

VDM mean that data Length is controlled by SCSn.
Do you control the SCSn for data length?

3

Hello Irina,

Yes, the SCSn pin is controlled by me, because on the bus I handle some port extender chips too.
The language what I use is the LunaAVR, so I had to write the routines for myself.
Here is the write routuine, as I handle the sending:

Procedure WriteStr(SendData as string, sid as byte)
// The ‘sid’ is the Socket ID
dim length, i as word
dim TX_RDptr, TX_WRptr as word
dim status as byte

length = len(SendData) // The length of the send data string

status = readSnSR(sid)
TX_RDptr = readSnTX_RD( sid )
TX_WRptr = getTXWR_VirtualAddress( sid )

CSACTIVE // Go to SCSn pin to LOW state

Spi.Master.WriteByte TX_WRptr.highbyte
Spi.Master.WriteByte TX_WRptr.lowbyte

ControlByte = (sid << 5) or 0x14
Spi.Master.WriteByte ControlByte

for i = 1 to length
Spi.Master.WriteByte ( SendData.bytevalue(i) )
next

CSPASSIVE // Go SCSn pin to HIGH state

TX_WRptr = TX_RDptr + length
writeSnTX_WR(TX_WRptr, sid)

writeSnCR(SnCR_SEND, sid)

endproc

In my opinion, this routine should works well, so the mistake can be in an other routine or I set a register wrong. Can it be possible?

All characters of the SendData will be send, just in a one-character length packet…