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Tài trợ cho PIC Vietnam |
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Ðiều Chỉnh | Xếp Bài |
11-04-2009, 11:18 AM
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Nhập môn đệ tử
Tham gia ngày: Dec 2007
Bài gửi: 5
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Giao tiếp giữa Ethernet và Pic
Mình đang làm giao tiếp về Ethernet và Pic, mình dùng MikroC để program cho Pic 16F877A, thông qua con ENC28J60. Nhưng mình chưa hiểu rõ việc kết nối giữa Pic và WebServer diễn ra như thế nào. Giả sử trong chương trình gửi một Byte lên từ PortD, vậy làm sao để Web biết được để hiển thị ra ngoài. Đây là Code của nó.
Em dùng Code này download xuống Pic nhưng khi truy cập vào địa chỉ đã assign cho Pic thì không thấy kết quả gì xảy ra.Mong các bạn giúp đỡ!!!! Cảm ơn các bạn nhiều. Code:
/*
* Project Name:
Spi_EthernetDemo (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 RC0 to RC7 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 !
* tested with PIC16F877A@10Mhz, PIC18F452@40Mhz on EasyPIC3 board
*
*
* EP settings :
* RA2 & RA3 pots jumper : closed
* PORTB : pull-down
* PORTC : pull-down
* BUTTONS : pull-up
*
* 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: PIC18F452/PIC16F877A
Dev.Board: EasyPIC4
Oscillator: HS/PLL4, 10.000MHz
Ext. Modules: mE Serial Ethernet board
SW: mikroC v7.0
* NOTES:
Make sure that you use right compiler version with this project
Renamed functions of Spi ethernet library from (v6.0)ENC28j60... to (v6.2)Spi_Ethernet...
*/
#define Spi_Ethernet_HALFDUPLEX 0
#define Spi_Ethernet_FULLDUPLEX 1
/************************************************************
* 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] = {192, 168, 20, 60} ; // my IP address
unsigned char getRequest[15] ; // HTTP request buffer
unsigned char dyna[31] ; // buffer for dynamic response
unsigned long httpCounter = 0 ; // counter of HTTP requests
/*******************************************
* 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) ;
}
/*
* 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) ;
}
/*
* 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
}
/*
* 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)
{
unsigned int len ; // my reply length
unsigned char *ptr ; // pointer to the dynamic buffer
// reply is made of the remote host IP address in human readable format
byteToStr(remoteHost[0], dyna) ; // first IP address byte
dyna[3] = '.' ;
byteToStr(remoteHost[1], dyna + 4) ; // second
dyna[7] = '.' ;
byteToStr(remoteHost[2], dyna + 8) ; // third
dyna[11] = '.' ;
byteToStr(remoteHost[3], dyna + 12) ; // fourth
dyna[15] = ':' ; // add separator
// then remote host port number
intToStr(remotePort, dyna + 16) ;
dyna[22] = '[' ;
intToStr(destPort, dyna + 23) ;
dyna[29] = ']' ;
dyna[30] = 0 ;
// the total length of the request is the length of the dynamic string plus the text of the request
len = 30 + reqLength ;
// puts the dynamic string into the transmit buffer
ptr = dyna ;
while(*ptr)
{
Spi_Ethernet_putByte(*ptr++) ;
}
// then puts the request string converted into upper char into the transmit buffer
while(reqLength--)
{
Spi_Ethernet_putByte(toupper(Spi_Ethernet_getByte())) ;
}
return(len) ; // back to the library with the length of the UDP reply
}
/*
* main entry
*/
void main()
{
ADCON1 = 0x00 ; // ADC convertors will be used
PORTA = 0 ;
TRISA = 0xff ; // set PORTA as input for ADC
PORTB = 0 ;
TRISB = 0xff ; // set PORTB as input for buttons
PORTD = 0 ;
TRISD = 0 ; // set PORTD as output
/*
* starts ENC28J60 with :
* reset bit on RC0
* CS bit on RC1
* my MAC & IP address
* full duplex
*/
Spi_Init();
Spi_Ethernet_Init(&PORTD, 1, &PORTD, 0, myMacAddr, myIpAddr, Spi_Ethernet_FULLDUPLEX) ;
while(1) // do forever
{
Spi_Ethernet_doPacket() ; // process incoming Ethernet packets
portd.f5=1;
/*
* add your stuff here if needed
* Spi_Ethernet_doPacket() must be called as often as possible
* otherwise packets could be lost
*/
}
}
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