tcp长时间传输数据出错

出现的问题是：在whie循环中多次执行send_data()之后，sdk Terminal窗口中报错：
#define ERR_MEM -1 /* Out of memory error. */
#define ERR_CONN -13 /* Not connected. */
程序在ch27上修改，在主函数的while循环中执行以下语句：

while (1)
{
/* call tcp timer every 250ms */
if(TcpTmrFlag)
{
if(request_pcb->state == CLOSED || (request_pcb->state == SYN_SENT && request_pcb->nrtx == TCP_SYNMAXRTX))
{
request_pcb = tcp_new();
if (!request_pcb) {
xil_printf("txperf: Error creating PCB. Out of Memory\r\n");
return -1;
}

//ip_set_option(request_pcb, SOF_REUSEADDR);

err = tcp_connect(request_pcb, &ipaddress, port, tcp_connected_callback);
if (err != ERR_OK) {
xil_printf("txperf: tcp_connect returned error: %d\r\n", err);
return err;
}
}
tcp_tmr();
TcpTmrFlag = 0;
}
/*receive input packet from emac*/
xemacif_input(netif);
/* if connected to the server, start receive data from PL through axidma, then transmit the data to the PC software by TCP*/
if(tcp_client_connected)
{
send_data();
sleep(1);
}

}

以下是send_data()函数：send_data()函数主要就是tcp_write()和tcp_output()函数。

void send_data()
{
#if __arm__
int copy = 3;
#else
int copy = 0;
#endif
err_t err;
struct tcp_pcb *tpcb = connected_pcb;
err = tcp_write(tpcb, yuan, 15, copy);
if (err != ERR_OK) {
xil_printf("txperf: Error on tcp_write: %d\r\n", err);
connected_pcb = NULL;
return;
}

err = tcp_output(tpcb);
if (err != ERR_OK) {
xil_printf("txperf: Error on tcp_output: %d\r\n",err);
return;
}

}

uisrc · 发表于 2019-7-17 14:01:21

操作系统不是实时系统，TCP本身也无法确保延迟的问题，所以这个有点难解决的

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