main.c

TCP/IP源码

//---------------------------------------------------------------------------
// Net MAIN.C
//
// 8051 Web Server project
// See Makefile for build notes 
// Written for Keil C51 V5.1 compiler, notes:
//   It uses big endian order, which is the same as the
//   network byte order, unlike x86 systems.
//   Use OPTIMIZE(2)or higher so that automatic variables get shared
//   between functions, to stay within the 256 bytes idata space
//---------------------------------------------------------------------------

#include <string.h>
#include <stdlib.h>
#include "C8051f.h"
#include "net.h"
#include "eth.h"
#include "serial.h"
#include "timer.h"
#include "analog.h"
#include "arp.h"
#include "tcp.h"
#include "http.h"
#include "ip.h"


// Global variables
UINT volatile event_word;
char xdata text[20];  
UCHAR idata debug;
UCHAR idata rcve_buf_allocated;


// This sets my hardware address to 00:01:02:03:04:05
UCHAR code my_hwaddr[6] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05}; 

// Hardware addr to send a broadcast
UCHAR code broadcast_hwaddr[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

// This sets my IP address to 192.168.0.10
ULONG code  my_ipaddr = 0xC0A8000AL;

// This sets my subnet mask to 255.255.255.0
ULONG code my_subnet = 0xFFFFFF00L;

// Set to 0 if no gateway is present on network
ULONG code gateway_ipaddr = 0;

//--------------------------------------------------------------------------
// Initialize the memory management routines
// Initialize variables declared in main
//--------------------------------------------------------------------------

unsigned int Count1msInc;
unsigned char Count1ms,Count10ms,Count1s;
unsigned char TimeSecond,TimeMinute;

void init_main(void)
{
	// Start the memory pool for incoming and outgoing Ethernet
	// frames at 1000, with length = 1500 bytes. Memory below 500
	// is used for program variables
	init_mempool((void xdata *)1000, 1500);
	memset(text, 0, sizeof(text));
	event_word = 0;
	rcve_buf_allocated = FALSE;
	debug = FALSE;
}

void PORT_Init (void)
{
   XBR0    = 0x07;                     // Enable SMBus, SPI0, and UART0
   XBR1    = 0x00;
   XBR2    = 0x44;                     // Enable crossbar and weak pull-ups
   EMI0TC  = 0x21;
   P74OUT  = 0xFF;
   P0MDOUT = 0x15;
}

void SPI0_Init (void)
{
   SPI0CFG = 0x07;                     // data sampled on 1st SCK rising edge
                                       // 8-bit data words
   SPI0CFG|=0xC0;	//CKPOL =1;

   SPI0CN = 0x03;                      // Master mode; SPI enabled; flags
                                       // cleared
   SPI0CKR = SYSCLK/2/8000000-1;       // SPI clock <= 8MHz (limited by 
                                       // EEPROM spec.)
}

void Timer0_Init (void)
{
   	CKCON|=0x8;
   	TMOD|=0x1;    	//16Bit
	Count10ms=10;
	Count1s=0;
   	TR0 = 0;                         	// STOP Timer0
   	TH0 = (-SYSCLK/1000) >> 8;    		// set Timer0 to overflow in 1ms
   	TL0 = -SYSCLK/1000;
   	TR0 = 1;   	// START Timer0
   	IE|= 0x2; 
}
void SYSCLK_Init (void)
{
   int i;                              // delay counter
   OSCXCN = 0x67;                      // start external oscillator with
                                       // 18.432MHz crystal
   for (i=0; i < 256; i++) ;           // Wait for osc. to start up
   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle
   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
                                       // detector
//	OSCICN = 0x07;   //interal 16MHZ
}
void Timer0_ISR (void) interrupt 1  //1ms
{
	TH0 = (-SYSCLK/1000) >> 8;  
   	TL0 = -SYSCLK/1000;
	if (Count1ms) Count1ms--;
	Count1msInc++;
	if (Count10ms) Count10ms--;
	else
	{
		Count10ms=10;    			//10ms
		if (Count1s) Count1s--;
		else
		{
			Count1s=100;			//1s
			TimeSecond++;
			if (TimeSecond>=60)
			{
				TimeSecond=0;		//1min
				TimeMinute++;
				if	(TimeMinute==60)	TimeMinute=0;
			}
		}
	}
}


void Delay1ms(unsigned char T)
{
	Count1ms=T;
	while (Count1ms);
}

/*通过SPI发送一字节*/
#define CHIP595_SELECT 		P5 &= ~(0x10); 			// P54 
#define CHIP_NOSELECT 		P5 |= 0xf8; 			// P53-57 

void SendSPIByte(unsigned char ch)
{
		SPIF = 0;
		SPI0DAT = ch;
		while (SPIF == 0);	 // wait for data transfer to be completed   				       	
} 

void LightONOFF(bit b)
{
	CHIP_NOSELECT;	
	CHIP595_SELECT;
	SendSPIByte(0x0);
	if (b)
	{
		SendSPIByte(0x01);
	}
	else
	{
		SendSPIByte(0x00);
	}
	CHIP_NOSELECT;	
}


void main (void)
{
	UINT j, event_word_copy;
	UCHAR xdata * inbuf;
                    	
  	WDTCN = 0xDE;              // Disable watchdog timer
	WDTCN = 0xAD;

	EMI0CF =0x24;						// share low 4K XRAM
	SYSCLK_Init ();                     // initialize oscillator
	Timer0_Init();
	PORT_Init ();                       // initialize crossbar and GPIO
	SPI0_Init ();                       // initialize SPI0

	init_main();
	init_tcp();
	init_http();

	EA=1;
	init_serial();
	SendCommString("Init OK\r\n");

	init_adc();
	init_timer2();
	init_arp();
	init_8019();
   
	

	j = 0;
	ET2 = 1;		            // Enable timer 2 interrupt
	   	
   // The code below is a priority based RTOS.  The event
   // handlers are in priority order - highest priority first.
	while (1)
   {
      // Query CS8900A to see if Ethernet frame has arrived
      // If so, set EVENT_ETH_ARRIVED bit in event_word
      query_8019();
      
      // Use a copy of event word to avoid interference
      // with interrupts
		EA = 0;
		event_word_copy = event_word;
		EA = 1;
      
      // See if an Ethernet frame has arrived      
      if (event_word_copy & EVENT_ETH_ARRIVED)
      {
         EA = 0;
         event_word &= (~EVENT_ETH_ARRIVED);
         EA = 1;
         
         // Allocate a buffer and read frame from CS8900A
         inbuf = rcve_frame();
         if (inbuf != NULL)
         {
            // Process the received Ethernet frame 
            eth_rcve(inbuf); 
         
            // If the memory allocated for the rcve message has
            // not already been freed then free it now
            if (rcve_buf_allocated)
            {
               free(inbuf);
               rcve_buf_allocated = FALSE;
            }
         }
      }
      
      // See if TCP retransmit timer has expired            	       
      else if (event_word_copy & EVENT_TCP_RETRANSMIT)
      {
         EA = 0;
         event_word &= (~EVENT_TCP_RETRANSMIT);
         EA = 1;
         tcp_retransmit();
 		}

      // See if TCP inactivity timer has expired
      else if (event_word_copy & EVENT_TCP_INACTIVITY)
      {
         EA = 0;
         event_word &= (~EVENT_TCP_INACTIVITY);
         EA = 1;
         tcp_inactivity();
 		}

      // See if ARP retransmit timer has expired
 		else if (event_word_copy & EVENT_ARP_RETRANSMIT)
      {
         EA = 0;
         event_word &= (~EVENT_ARP_RETRANSMIT);
         EA = 1;
         arp_retransmit();
		}

      // See if it is time to age the ARP cache
      else if (event_word_copy & EVENT_AGE_ARP_CACHE)
      {
         EA = 0;
         event_word &= (~EVENT_AGE_ARP_CACHE);
			EA = 1;
         age_arp_cache();
		}

		// See if it is time to read the analog inputs
		else if (event_word_copy & EVENT_READ_ANALOG)
      {
         EA = 0;
         event_word &= (~EVENT_READ_ANALOG);
         EA = 1;
			// Read one of the 3 analog inputs each time
			read_analog_inputs();
      }

		// See if an RS232 message has arrived.  It is
      // not handled - RS232 is used for sending only
		else if (event_word_copy & EVENT_RS232_ARRIVED)
      {
         EA = 0;
         event_word &= (~EVENT_RS232_ARRIVED);
         EA = 1;
      }
   }
}