hungrymind
Newbie level 5
Hi,
I'm using ENC28J60 with SPI Ethernet Library. And trying to simulate it with proteus.
When I simulating it after few seconds proteus giving a warning like packet dropped due to buffer overflow.
I got this code from SPI Ethernet Library samples.
I don't know the actual reason for it. But I'm assuming it might be happened bz of clock frequency of PIC?
But I don't know how to solve it. Can any one help me pls?
I'm using ENC28J60 with SPI Ethernet Library. And trying to simulate it with proteus.
When I simulating it after few seconds proteus giving a warning like packet dropped due to buffer overflow.
I got this code from SPI Ethernet Library samples.
I don't know the actual reason for it. But I'm assuming it might be happened bz of clock frequency of PIC?
But I don't know how to solve it. Can any one help me pls?
Code:
#include "__EthEnc28j60.h"
/*
* Project Name:
enc28j60Demo (Ethernet Library demo for ENC28J60 mcu)
* Target Platform:
PIC
* Copyright:
(c) mikroElektronika, 2006.
* Revision History:
20060810:
- Initial release. Author: Bruno Gavand.
*
* V1.0 : first release
* V1.1 : bad MIME type for / path request, changed to HTML instead of SCRIPT (thanks Srdjan !)
*
* description :
* this code shows how to use the Spi_Ethernet mini library :
* the board will reply to ARP & ICMP echo requests
* the board will reply to UDP requests on any port :
* returns the request in upper char with a header made of remote host IP & port number
* the board will reply to HTTP requests on port 80, GET method with pathnames :
* / will return the HTML main page
* /s will return board status as text string
* /t0 ... /t7 will toggle RD0 to RD7 bit and return HTML main page
* all other requests return also HTML main page
*
* target devices :
* any PIC with integrated SPI and more than 4 Kb ROM memory
* 32 to 40 MHz clock is recommended to get from 8 to 10 Mhz SPI clock,
* otherwise PIC should be clocked by ENC clock output due to ENC silicon bug in SPI hardware
* if you try lower PIC clock speed, don't be surprised if the board hang or miss some requests !
*
* EP settings :
* RA2 & RA3 pots jumper : closed
* PORTA : pull-down (place jumper J1 to lower position) (board specific)
* PORTB : pull-down (place jumper J2 to lower position) (board specific)
* PORTC : pull-down (place jumper J3 to lower position) (board specific)
* BUTTONS : pull-up (place jumper J17 to upper position) (board specific)
*
* RC0 : !RESET to ENC reset input pin
* RC1 : !CS to ENC chip select input pin
* the ENC28J60 SPI bus CLK, SO, SI must be connected to the corresponding SPI pins of the PIC
* the INT and WOL signals from the ENC are not used
*
* Test configuration:
MCU: PIC16F887
Dev.Board: EasyPIC5
Oscillator: HS, 08.000MHz
Ext. Modules: mE Serial Ethernet board
SW: mikroC v8.0
* NOTES:
- Make sure that you use right compiler version with this project (v6.2 and older).
Spi ethernet library routines are renamed from (v6.0)ENC28j60... to (v6.2)Spi_Ethernet...
- Since the ENC28J60 doesn't support auto-negotiation, full-duplex mode is
not compatible with most switches/routers. If a dedicated network is used
where the duplex of the remote node can be manually configured, you may
change this configuration. Otherwise, half duplex should always be used.
- External power supply should be used due to Serial Ethernet Board power consumption.
*/
// duplex config flags
#define Spi_Ethernet_HALFDUPLEX 0x00 // half duplex
#define Spi_Ethernet_FULLDUPLEX 0x01 // full duplex
// mE ehternet NIC pinout
sfr sbit SPI_Ethernet_Rst at RC0_bit;
sfr sbit SPI_Ethernet_CS at RC1_bit;
sfr sbit SPI_Ethernet_Rst_Direction at TRISC0_bit;
sfr sbit SPI_Ethernet_CS_Direction at TRISC1_bit;
// end ethernet NIC definitions
/************************************************************
* ROM constant strings
*/
const unsigned char httpHeader[] = "HTTP/1.1 200 OK\nContent-type: " ; // HTTP header
const unsigned char httpMimeTypeHTML[] = "text/html\n\n" ; // HTML MIME type
const unsigned char httpMimeTypeScript[] = "text/plain\n\n" ; // TEXT MIME type
unsigned char httpMethod[] = "GET /";
/*
* web page, splited into 2 parts :
* when coming short of ROM, fragmented data is handled more efficiently by linker
*
* this HTML page calls the boards to get its status, and builds itself with javascript
*/
const char *indexPage = // Change the IP address of the page to be refreshed
"<meta http-equiv=\"refresh\" content=\"3;url=http://192.168.20.60\">\
<HTML><HEAD></HEAD><BODY>\
<h1>PIC + ENC28J60 Mini Web Server</h1>\
<a href=/>Reload</a>\
<script src=/s></script>\
<table><tr><td valign=top><table border=1 style=\"font-size:20px ;font-family: terminal ;\">\
<tr><th colspan=2>ADC</th></tr>\
<tr><td>AN2</td><td><script>document.write(AN2)</script></td></tr>\
<tr><td>AN3</td><td><script>document.write(AN3)</script></td></tr>\
</table></td><td><table border=1 style=\"font-size:20px ;font-family: terminal ;\">\
<tr><th colspan=2>PORTB</th></tr>\
<script>\
var str,i;\
str=\"\";\
for(i=0;i<8;i++)\
{str+=\"<tr><td bgcolor=pink>BUTTON #\"+i+\"</td>\";\
if(PORTB&(1<<i)){str+=\"<td bgcolor=red>ON\";}\
else {str+=\"<td bgcolor=#cccccc>OFF\";}\
str+=\"</td></tr>\";}\
document.write(str) ;\
</script>\
" ;
const char *indexPage2 = "</table></td><td>\
<table border=1 style=\"font-size:20px ;font-family: terminal ;\">\
<tr><th colspan=3>PORTD</th></tr>\
<script>\
var str,i;\
str=\"\";\
for(i=0;i<8;i++)\
{str+=\"<tr><td bgcolor=yellow>LED #\"+i+\"</td>\";\
if(PORTD&(1<<i)){str+=\"<td bgcolor=red>ON\";}\
else {str+=\"<td bgcolor=#cccccc>OFF\";}\
str+=\"</td><td><a href=/t\"+i+\">Toggle</a></td></tr>\";}\
document.write(str) ;\
</script>\
</table></td></tr></table>\
This is HTTP request #<script>document.write(REQ)</script></BODY></HTML>\
" ;
/***********************************
* RAM variables
*/
unsigned char myMacAddr[6] = {0x00, 0x14, 0xA5, 0x76, 0x19, 0x3f} ; // my MAC address
unsigned char myIpAddr[4] = {10, 40, 18, 136} ; // my IP address
unsigned char getRequest[15] ; // HTTP request buffer
unsigned char dyna[30] ; // buffer for dynamic response
unsigned long httpCounter = 0 ; // counter of HTTP requests
unsigned char sendIpAddr[4] = {10, 40, 18, 133} ;
/*******************************************
* functions
*/
/*
* put the constant string pointed to by s to the ENC transmit buffer.
*/
/*unsigned int putConstString(const char *s)
{
unsigned int ctr = 0 ;
while(*s)
{
Spi_Ethernet_putByte(*s++) ;
ctr++ ;
}
return(ctr) ;
}*/
/*
* it will be much faster to use library Spi_Ethernet_putConstString routine
* instead of putConstString routine above. However, the code will be a little
* bit bigger. User should choose between size and speed and pick the implementation that
* suites him best. If you choose to go with the putConstString definition above
* the #define line below should be commented out.
*
*/
#define putConstString SPI_Ethernet_putConstString
/*
* put the string pointed to by s to the ENC transmit buffer
*/
/*unsigned int putString(char *s)
{
unsigned int ctr = 0 ;
while(*s)
{
Spi_Ethernet_putByte(*s++) ;
ctr++ ;
}
return(ctr) ;
}*/
/*
* it will be much faster to use library Spi_Ethernet_putString routine
* instead of putString routine above. However, the code will be a little
* bit bigger. User should choose between size and speed and pick the implementation that
* suites him best. If you choose to go with the putString definition above
* the #define line below should be commented out.
*
*/
#define putString SPI_Ethernet_putString
/*
* this function is called by the library
* the user accesses to the HTTP request by successive calls to Spi_Ethernet_getByte()
* the user puts data in the transmit buffer by successive calls to Spi_Ethernet_putByte()
* the function must return the length in bytes of the HTTP reply, or 0 if nothing to transmit
*
* if you don't need to reply to HTTP requests,
* just define this function with a return(0) as single statement
*
*/
unsigned int SPI_Ethernet_UserTCP(unsigned char *remoteHost, unsigned int remotePort, unsigned int localPort, unsigned int reqLength)
{
/*
unsigned int len = 0 ; // my reply length
unsigned int i ; // general purpose integer
if(localPort != 80) // I listen only to web request on port 80
{
return(0) ;
}
// get 10 first bytes only of the request, the rest does not matter here
for(i = 0 ; i < 10 ; i++)
{
getRequest[i] = SPI_Ethernet_getByte() ;
}
getRequest[i] = 0 ;
if(memcmp(getRequest, httpMethod, 5)) // only GET method is supported here
{
return(0) ;
}
httpCounter++ ; // one more request done
if(getRequest[5] == 's') // if request path name starts with s, store dynamic data in transmit buffer
{
// the text string replied by this request can be interpreted as javascript statements
// by browsers
len = putConstString(httpHeader) ; // HTTP header
len += putConstString(httpMimeTypeScript) ; // with text MIME type
// add AN2 value to reply
IntToStr(ADC_Read(2), dyna) ;
len += putConstString("var AN2=") ;
len += putString(dyna) ;
len += putConstString(";") ;
// add AN3 value to reply
IntToStr(ADC_Read(3), dyna) ;
len += putConstString("var AN3=") ;
len += putString(dyna) ;
len += putConstString(";") ;
// add PORTB value (buttons) to reply
len += putConstString("var PORTB=") ;
IntToStr(PORTB, dyna) ;
len += putString(dyna) ;
len += putConstString(";") ;
// add PORTD value (LEDs) to reply
len += putConstString("var PORTD=") ;
IntToStr(PORTD, dyna) ;
len += putString(dyna) ;
len += putConstString(";") ;
// add HTTP requests counter to reply
IntToStr(httpCounter, dyna) ;
len += putConstString("var REQ=") ;
len += putString(dyna) ;
len += putConstString(";") ;
}
else if(getRequest[5] == 't') // if request path name starts with t, toggle PORTD (LED) bit number that comes after
{
unsigned char bitMask = 0 ; // for bit mask
if(isdigit(getRequest[6])) // if 0 <= bit number <= 9, bits 8 & 9 does not exist but does not matter
{
bitMask = getRequest[6] - '0' ; // convert ASCII to integer
bitMask = 1 << bitMask ; // create bit mask
PORTD ^= bitMask ; // toggle PORTD with xor operator
}
}
if(len == 0) // what do to by default
{
len = putConstString(httpHeader) ; // HTTP header
len += putConstString(httpMimeTypeHTML) ; // with HTML MIME type
len += putConstString(indexPage) ; // HTML page first part
len += putConstString(indexPage2) ; // HTML page second part
}
return(len) ; // return to the library with the number of bytes to transmit
*/
return 0;
}
/*
* this function is called by the library
* the user accesses to the UDP request by successive calls to Spi_Ethernet_getByte()
* the user puts data in the transmit buffer by successive calls to Spi_Ethernet_putByte()
* the function must return the length in bytes of the UDP reply, or 0 if nothing to transmit
*
* if you don't need to reply to UDP requests,
* just define this function with a return(0) as single statement
*
*/
unsigned int SPI_Ethernet_UserUDP(unsigned char *remoteHost, unsigned int remotePort, unsigned int destPort, unsigned int reqLength)
{
return 0;
}
unsigned int sendPcaket(unsigned char *remoteHost, unsigned int remotePort, unsigned int destPort, unsigned int reqLength)
{
return 0;
}
/*
* main entry
*/
void main()
{
ANSEL = 0x0C ; // AN2 and AN3 convertors will be used
C1ON_bit = 0; // Disable comparators
C2ON_bit = 0;
PORTA = 0 ;
TRISA = 0xff ; // set PORTA as input for ADC
ANSELH = 0; // Configure other AN pins as digital I/O
PORTB = 0 ;
TRISB = 0xff ; // set PORTB as input for buttons
TRISD = 0 ; // set PORTD as output
PORTD = 0xFF ;
/*
* starts ENC28J60 with :
* reset bit on RC0
* CS bit on RC1
* my MAC & IP address
* full duplex
*/
SPI1_Init();
SPI_Ethernet_Init(myMacAddr, myIpAddr, Spi_Ethernet_FULLDUPLEX) ;
while(1) // do forever
{
/*
* if necessary, test the return value to get error code
*/
SPI_Ethernet_doPacket() ; // process incoming Ethernet packets
/*
* add your stuff here if needed
* Spi_Ethernet_doPacket() must be called as often as possible
* otherwise packets could be lost
*/
}
}