Hello,
I'm writing to you cause i tried to create an account in order to write
a form on the help forum, but i get error and i cannot create a user
account.
If you can directly help me concerning the LWIP this is my problem :
I try to use the LWip on a PPC440 on a xilinx virtex5. I took an "echo
server" code that i modified a bit in order to match my needs.
Actually my code is working sometime and sometime not, and i cannot
figure out the reason.
My environment is :
- I have an evaluation board with a xilinx FPGA and the PPC on it
- I have a software
- I try to connect my software on the board
- When it's work, the sw send frame and ack to the board and the board
send back frame and ack until a connection is established.
Problem is :
- Frames that are coming back from the board should be this type:
46c3c3c3
c318code
52000000
........
- but when it doesn't work the header and only this one have strange
value for example :
aaaaaaaa
c318code
52000000
........
- Cause of that the connection is not established between the board and
the software.
the code i'm using to send the frame back is :
err_t hello_poll(void *arg, struct tcp_pcb *pcb)
{
u8_t *state = (u8_t *)arg;
if (*state == 3) /* close received and hello world
send */
if (tcp_close(pcb) == ERR_OK)
hello_end(pcb, state);
Xuint32 Fifo_datain;
Xuint32 Fifo_Empty;
Fifo_Empty =
CUSTOM_IP_TCP_FIFO_mReadFIFOEmpty(XPAR_CUSTOM_IP_TCP_FIFO_0_BASEADDR);
//xil_printf("\tFifo_Empty register : 0x%X\r\n",Fifo_Empty);
if (Fifo_Empty==0x00000000)
//xil_printf("\tFifo is not empty\r\n");
Fifo_datain =
CUSTOM_IP_TCP_FIFO_mReadFromFIFO(XPAR_CUSTOM_IP_TCP_FIFO_0_BASEADDR, 0);
//xil_printf("\tFifo_datain register : 0x%X\r\n",Fifo_datain);
Xuint32* data1;
*data1=Fifo_datain;
tcp_write(pcb, data1, sizeof(Fifo_datain), 1);
//tcp_output(pcb);
Fifo_Empty =
CUSTOM_IP_TCP_FIFO_mReadFIFOEmpty(XPAR_CUSTOM_IP_TCP_FIFO_0_BASEADDR);
}
return ERR_OK;
}
before the line "tcp_write" the value of "data1" is the good one
(c3c3c346). I can check it by send "data1" on the output uart.
I really don't understand the problem cause it sometime work... Please
can you help me cause i'm really confused.
Thank you
David
