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tcp_send function acting weird

Hello,

I use TCPNet for my ethernet connection. I have a buffer wich I pass through via the function tcp_send, when I change the values of this buffer right after I called the function, then I receive the new values instead of the original ones.
I change the values to show what I have sent on my display, so I add 48 with my original byte.

It's not always that this new value is being sent but around 1/10 to 1/100 times that the new value is sent.

Could it be that this function activates some sort of new thread wich operates next to mine???

Here's some of my code:

Eth_TapTeller_Frame = (ETH_TAPTELLER_FRAME *) tcp_get_buf(sizeof(ETH_TAPTELLER_FRAME));
                                Eth_TapTeller_Frame->Header.Versie = 1;
   ...
tcp_send (tcp_soc, (U8 *)Eth_TapTeller_Frame, 19);

P_Tekst = (U8 *)Eth_TapTeller_Frame;
for (y=0;y<19;y++){
   *(U8*)P_Tekst++ +=48;
}
*P_Tekst=0;             //end of string toevoegen
LCD_gotoxy(1,4);
LCD_puts((U8 *)Eth_TapTeller_Frame);

Anyone got an idea???

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