一个简单的51 SPI Ethernet 测试程序

ID:406093 · 发表于 2018-11-17 09:23

本帖最后由 oldspring 于 2018-11-17 09:27 编辑

51芯片内部没有Ethernet模块，无法直接与网络连接，但是我们可以利用外部网络专用芯片ENC28J60，使得我们的51芯片可以进行网络通信。这里介绍一个简单的51 SPI Ethernet 测试程序，希望大家能够喜欢。
注意：这个51编译器的Ethernet库函数支持：

IPv4 protocol.
ARP requests.
ICMP echo requests.
UDP requests.
TCP requests (no stack, no packet reconstruction).
packet fragmentation is NOT supported.

// 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 P1_0_bit;
sfr sbit Spi_Ethernet_CS at P1_1_bit;
// end ethernet NIC definitions
/************************************************************
* ROM constant strings
*/
const code unsigned char httpHeader[] = "HTTP/1.1 200 OKnContent-type: " ; // HTTP header
const code unsigned char httpMimeTypeHTML[] = "text/htmlnn" ; // HTML MIME type
const code unsigned char httpMimeTypeScript[] = "text/plainnn" ; // TEXT MIME type
idata 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 code 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>8051 + ENC28J60 Mini Web Server</h1>
<a href=/>Reload</a>
<script src=/s></script>
<table><tr><td><table border=1 style="font-size:20px ;font-family: terminal ;">
<tr><th colspan=2>P0</th></tr>
<script>
var str,i;
str="";
for(i=0;i<8;i++)
{str+="<tr><td bgcolor=pink>BUTTON #"+i+"</td>";
if(P0&(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>P3</th></tr>
<script>
var str,i;
str="";
for(i=0;i<8;i++)
{str+="<tr><td bgcolor=yellow>LED #"+i+"</td>";
if(P3&(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
*/
idata unsigned char myMacAddr[6] = {0x00, 0x14, 0xA5, 0x76, 0x19, 0x3f} ; // my MAC address
idata unsigned char myIpAddr[4] = {192, 168, 20, 60} ; // my IP address
idata unsigned char getRequest[15] ; // HTTP request buffer
idata unsigned char dyna[29] ; // buffer for dynamic response
idata 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 code 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)
{
idata unsigned int len; // my reply length
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(len = 0 ; len < 10 ; len++)
{
getRequest[len] = Spi_Ethernet_getByte() ;
}
getRequest[len] = 0 ;
len = 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 P3 value (buttons) to reply
len += putConstString("var P3=") ;
WordToStr(P3, dyna) ;
len += putString(dyna) ;
len += putConstString(";") ;
// add P0 value (LEDs) to reply
len += putConstString("var P0=") ;
WordToStr(P0, dyna) ;
len += putString(dyna) ;
len += putConstString(";") ;
// add HTTP requests counter to reply
WordToStr(httpCounter, dyna) ;
len += putConstString("var REQ=") ;
len += putString(dyna) ;
len += putConstString(";") ;
}
else if(getRequest[5] == 't') // if request path name starts with t, toggle P3 (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
P3 ^= bitMask ; // toggle P3 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)
{
idata unsigned int len ; // my reply length
idata 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
WordToStr(remotePort, dyna + 16) ;
dyna[21] = '[' ;
WordToStr(destPort, dyna + 22) ;
dyna[27] = ']' ;
dyna[28] = 0 ;
// the total length of the request is the length of the dynamic string plus the text of the request
len = 28 + reqLength;
// puts the dynamic string into the transmit buffer
Spi_Ethernet_putBytes(dyna, 28) ;
// 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()
{
/*
* starts ENC28J60 with :
* reset bit on P1_0
* CS bit on P1_1
* my MAC & IP address
* full duplex
*/
SPI1_Init();
Spi_Ethernet_Init(myMacAddr, myIpAddr, Spi_Ethernet_FULLDUPLEX) ; // full duplex, CRC + MAC Unicast + MAC Broadcast filtering
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
*/
}
}

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一个简单的51 SPI Ethernet 测试程序

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