main.c

//DEFINE STATEMENTS TO INCREASE SPEED
#undef LWIP_TCP
#undef LWIP_DHCP
//#undef CHECKSUM_CHECK_UDP
//#undef LWIP_CHECKSUM_ON_COPY
//#undef CHECKSUM_GEN_UDP

#include <stdio.h>

#include "xparameters.h"

#include "netif/xadapter.h"

#include "platform.h"
#include "platform_config.h"
#if defined (__arm__) || defined(__aarch64__)
#include "xil_printf.h"
#endif

#include "lwip/udp.h"
#include "xil_cache.h"

// Include our own definitions
#include "includes.h"

/* defined by each RAW mode application */
void print_app_header();
int start_application();
//int transfer_data();
void tcp_fasttmr(void);
void tcp_slowtmr(void);

/* missing declaration in lwIP */
void lwip_init();

extern volatile int TcpFastTmrFlag;
extern volatile int TcpSlowTmrFlag;
/* set up netif stuctures */
static struct netif server_netif;
struct netif *echo_netif;

// Global Variables to store results and handle data flow
int			Centroid;

// Global variables for data flow
volatile u8		IndArrDone;
volatile u32		EthBytesReceived;
volatile u8		SendResults;
volatile u8   		DMA_TX_Busy;
volatile u8		Error;

// Global Variables for Ethernet handling
u16_t    		RemotePort = 8;
struct ip_addr  	RemoteAddr;
struct udp_pcb 		send_pcb;

void
print_ip(char *msg, struct ip_addr *ip) 
{
	print(msg);
	xil_printf("%d.%d.%d.%d\n\r", ip4_addr1(ip), ip4_addr2(ip), 
			ip4_addr3(ip), ip4_addr4(ip));
}

void
print_ip_settings(struct ip_addr *ip, struct ip_addr *mask, struct ip_addr *gw)
{

	print_ip("Board IP: ", ip);
	print_ip("Netmask : ", mask);
	print_ip("Gateway : ", gw);
}

/* print_app_header: function to print a header at start time */
void print_app_header()
{
	xil_printf("\n\r\n\r------lwIP UDP GetCentroid Application------\n\r");
	xil_printf("UDP packets sent to port 7 will be processed\n\r");
}

int main()
{
	struct ip_addr ipaddr, netmask, gw /*, Remotenetmask, Remotegw*/;
	struct pbuf * psnd;
	err_t udpsenderr;
	int status = 0;

	/* the mac address of the board. this should be unique per board */
	unsigned char mac_ethernet_address[] =
	{ 0x00, 0x0a, 0x35, 0x00, 0x01, 0x10 };

	/* Use the same structure for the server and the echo server */
	echo_netif = &server_netif;
	init_platform();

	/* initialize IP addresses to be used */
	IP4_ADDR(&ipaddr,  10, 0,   0, 10);
	IP4_ADDR(&netmask, 255, 255, 255,  0);
	IP4_ADDR(&gw,      10, 0,   0,  1);

	IP4_ADDR(&RemoteAddr,  10, 0,   0, 77);
	//IP4_ADDR(&Remotenetmask, 255, 255, 255,  0);
	//IP4_ADDR(&Remotegw,      10, 0,   0,  1);

	print_app_header();

	/* Initialize the lwip for UDP */
	lwip_init();

  	/* Add network interface to the netif_list, and set it as default */
	if (!xemac_add(echo_netif, &ipaddr, &netmask,
						&gw, mac_ethernet_address,
						PLATFORM_EMAC_BASEADDR)) {
		xil_printf("Error adding N/W interface\n\r");
		return -1;
	}
	netif_set_default(echo_netif);

	/* now enable interrupts */
	platform_enable_interrupts();

	/* specify that the network if is up */
	netif_set_up(echo_netif);

	xil_printf("Zedboard IP settings: \r\n");
	print_ip_settings(&ipaddr, &netmask, &gw);
	xil_printf("Remote IP settings: \r\n");
	//print_ip_settings(&RemoteAddr, &Remotenetmask, &Remotegw);
	print_ip("Board IP: ", &RemoteAddr);

	/* start the application (web server, rxtest, txtest, etc..) */
	status = start_application();
	if (status != 0){
		xil_printf("Error in start_application() with code: %d\n\r", status);
		goto ErrorOrDone;
	}

	/* receive and process packets */
	while (Error==0) {

		if (TcpFastTmrFlag) {
			tcp_fasttmr();
			TcpFastTmrFlag = 0;
			//SendResults = 1;
			//xil_printf("*");
		}
		if (TcpSlowTmrFlag) {
			tcp_slowtmr();
			TcpSlowTmrFlag = 0;
			SendResults = 1;
		}
		//xemacif_input(echo_netif);
		//transfer_data();

		/* Receive packets */
		xemacif_input(echo_netif);

		/* Send results back from time to time */
		if (SendResults == 1){

			SendResults = 0;
			// Read the results from the FPGA
			Centroid = 0xA5;

			// Send out the centroid result over UDP
			psnd = pbuf_alloc(PBUF_TRANSPORT, sizeof(int), PBUF_REF);
			psnd->payload = &Centroid;
			udpsenderr = udp_sendto(&send_pcb, psnd, &RemoteAddr, RemotePort);
			xil_printf(".");
			if (udpsenderr != ERR_OK){
				xil_printf("UDP Send failed with Error %d\n\r", udpsenderr);
				goto ErrorOrDone;
			}
			pbuf_free(psnd);
		}
	}
  
	// Jump point for failure
ErrorOrDone:
	xil_printf("Catastrophic Error! Shutting down and exiting...\n\r");

	// Disable the GetCentroid interrupts and disconnect from the GIC
	//DisableIntrSystem(&Intc, GETCENTROID_INTR_ID, &GetCentroid, TX_INTR_ID);

	cleanup_platform();
	return 0;
}