کد:
'-----------------------------------------------------------
' Atmega168 and ENC28J60
'-----------------------------------------------------------
' Version 1.0 - june 2007 by Ben Zijlstra
' august 2007 addins by Viktor Varga
'fusebits:
'Atmega168 - External clock (from 6.25 Mhz to 12.5 Mhz) No div by 8
$regfile = "m8def.dat"
$crystal = 12500000
$baud = 19200 'put terminal on 19200 baud
$hwstack = 64
$swstack = 64
$framesize = 64
$include "enc28j60.inc"
$lib "tcpip.lbx"
Enc28j60_cs Alias Portb.2
Led Alias Portb.1
'/* Maximum frame length - The Atmega168 has only 1024 byte internal RAM! */
Const Max_framelen = 200 '200 byte will be enough for common tasks
Config Enc28j60_cs = Output
Config Led = Output
Set Led 'Turn off the tuxgraphics board LED
Dim X As Byte
Dim A(5) As Byte
Dim Bank As Byte
Dim Enc28j60_data As Byte
Dim Nextpacketptr As Word
Dim Value As Byte
Dim Wdata As Word
Dim Buffer(max_framelen) As Byte
Dim Length As Word
Dim Rxstat As Word
Dim Ip_id As Word
Dim I_header_length As Word
'Ethernet packet destination
Dim T_enetpacketdest0 As Byte At Buffer Overlay
Dim T_enetpacketdest1 As Byte At Buffer + &H01 Overlay
Dim T_enetpacketdest2 As Byte At Buffer + &H02 Overlay
Dim T_enetpacketdest3 As Byte At Buffer + &H03 Overlay
Dim T_enetpacketdest4 As Byte At Buffer + &H04 Overlay
Dim T_enetpacketdest5 As Byte At Buffer + &H05 Overlay
'Ethernet packet source
Dim T_enetpacketsrc0 As Byte At Buffer + &H06 Overlay
Dim T_enetpacketsrc1 As Byte At Buffer + &H07 Overlay
Dim T_enetpacketsrc2 As Byte At Buffer + &H08 Overlay
Dim T_enetpacketsrc3 As Byte At Buffer + &H09 Overlay
Dim T_enetpacketsrc4 As Byte At Buffer + &H0A Overlay
Dim T_enetpacketsrc5 As Byte At Buffer + &H0B Overlay
'Ethernet packet type
Dim T_enetpackettype As Word At Buffer + &H0C Overlay
Dim T_arp_hwtype1 As Byte At Buffer + &H0F Overlay
'Arp
Dim T_arp_prttype1 As Byte At Buffer + &H11 Overlay
Dim T_arp_hwlen As Byte At Buffer + &H12 Overlay
Dim T_arp_prlen As Byte At Buffer + &H13 Overlay
Dim T_arp_op1 As Byte At Buffer + &H15 Overlay
'arp source ip address
Dim T_arp_sipaddr0 As Byte At Buffer + &H1C Overlay
Dim T_arp_sipaddr1 As Byte At Buffer + &H1D Overlay
Dim T_arp_sipaddr2 As Byte At Buffer + &H1E Overlay
Dim T_arp_sipaddr3 As Byte At Buffer + &H1F Overlay
'arp target IP address
Dim T_arp_tipaddr As Long At Buffer + &H26 Overlay
'IP header layout IP version and header length
Dim T_ip_vers_len As Byte At Buffer + &H0E Overlay
Dim T_arp_hwtype0 As Byte At Buffer + &H0E Overlay
'Arp
Dim T_arp_prttype0 As Byte At Buffer + &H10 Overlay
Dim T_arp_op0 As Byte At Buffer + &H14 Overlay
'arp source mac address
Dim T_arp_src_enetpacket0 As Byte At Buffer + &H16 Overlay
Dim T_arp_src_enetpacket1 As Byte At Buffer + &H17 Overlay
Dim T_arp_src_enetpacket2 As Byte At Buffer + &H18 Overlay
Dim T_arp_src_enetpacket3 As Byte At Buffer + &H19 Overlay
Dim T_arp_src_enetpacket4 As Byte At Buffer + &H1A Overlay
Dim T_arp_src_enetpacket5 As Byte At Buffer + &H1B Overlay
'arp source mac address
Dim T_arp_dest_enetpacket0 As Byte At Buffer + &H20 Overlay
Dim T_arp_dest_enetpacket1 As Byte At Buffer + &H21 Overlay
Dim T_arp_dest_enetpacket2 As Byte At Buffer + &H22 Overlay
Dim T_arp_dest_enetpacket3 As Byte At Buffer + &H23 Overlay
Dim T_arp_dest_enetpacket4 As Byte At Buffer + &H24 Overlay
Dim T_arp_dest_enetpacket5 As Byte At Buffer + &H25 Overlay
Dim T_tos As Byte At Buffer + &H0F Overlay
'Buffer length
Dim T_ip_pktlen0 As Byte At Buffer + &H10 Overlay
Dim T_ip_pktlen1 As Byte At Buffer + &H11 Overlay
Dim T_id0 As Byte At Buffer + &H12 Overlay
Dim T_id1 As Byte At Buffer + &H13 Overlay
Dim T_flags As Byte At Buffer + &H14 Overlay
Dim T_offset As Byte At Buffer + &H15 Overlay
Dim T_ttl As Byte At Buffer + &H16 Overlay
'protocol (ICMP=1, TCP=6, UDP=11)
Dim T_ip_proto As Byte At Buffer + &H17 Overlay
'header checksum
Dim T_ip_hdr_cksum0 As Byte At Buffer + &H18 Overlay
Dim T_ip_hdr_cksum1 As Byte At Buffer + &H19 Overlay
Dim T_ip_hdr_cksum As Word At Buffer + &H18 Overlay
'IP address of source
Dim T_ip_srcaddr0 As Byte At Buffer + &H1A Overlay
Dim T_ip_srcaddr1 As Byte At Buffer + &H1B Overlay
Dim T_ip_srcaddr2 As Byte At Buffer + &H1C Overlay
Dim T_ip_srcaddr3 As Byte At Buffer + &H1D Overlay
Dim T_ip_srcaddr As Long At Buffer + &H1A Overlay
'IP address of destination
Dim T_ip_destaddr0 As Byte At Buffer + &H1E Overlay
Dim T_ip_destaddr1 As Byte At Buffer + &H1F Overlay
Dim T_ip_destaddr2 As Byte At Buffer + &H20 Overlay
Dim T_ip_destaddr3 As Byte At Buffer + &H21 Overlay
Dim T_ip_destaddr As Long At Buffer + &H1E Overlay
Dim T_icmp_type As Byte At Buffer + &H22 Overlay
Dim T_icmp_code As Byte At Buffer + &H23 Overlay
Dim T_icmp_cksum0 As Byte At Buffer + &H24 Overlay
Dim T_icmp_cksum1 As Byte At Buffer + &H25 Overlay
Dim T_icmp_cksum As Word At Buffer + &H24 Overlay
Dim Tcp_srcporth As Byte At Buffer + &H22 Overlay
Dim Tcp_srcportl As Byte At Buffer + &H23 Overlay
Dim Tcp_destporth As Byte At Buffer + &H24 Overlay
Dim Tcp_destportl As Byte At Buffer + &H25 Overlay
Dim Tcp_seqnum3 As Byte At Buffer + &H26 Overlay
Dim Tcp_seqnum2 As Byte At Buffer + &H27 Overlay
Dim Tcp_seqnum1 As Byte At Buffer + &H28 Overlay
Dim Tcp_seqnum0 As Byte At Buffer + &H29 Overlay
Dim Tcp_acknum3 As Byte At Buffer + &H2A Overlay
Dim Tcp_acknum2 As Byte At Buffer + &H2B Overlay
Dim Tcp_acknum1 As Byte At Buffer + &H2C Overlay
Dim Tcp_acknum0 As Byte At Buffer + &H2D Overlay
Dim Tcp_hdr As Byte At Buffer + &H2E Overlay
Dim Tcp_flags As Byte At Buffer + &H2F Overlay
Dim Tcp_cksumh As Byte At Buffer + &H32 Overlay
Dim Tcp_cksuml As Byte At Buffer + &H33 Overlay
Dim Tcp_cksum As Word At Buffer + &H32 Overlay
'UDP header
Dim T_udp_srcport0 As Byte At Buffer + &H22 Overlay
Dim T_udp_srcport1 As Byte At Buffer + &H23 Overlay
Dim T_udp_srcport As Word At Buffer + &H22 Overlay
Dim T_udp_destport0 As Byte At Buffer + &H24 Overlay
Dim T_udp_destport1 As Byte At Buffer + &H25 Overlay
Dim T_udp_destport As Word At Buffer + &H24 Overlay
Dim T_udp_len0 As Byte At Buffer + &H26 Overlay
Dim T_udp_len1 As Byte At Buffer + &H27 Overlay
Dim T_udp_chksum0 As Byte At Buffer + &H28 Overlay
Dim T_udp_chksum1 As Byte At Buffer + &H29 Overlay
Dim T_udp_chksum As Word At Buffer + &H28 Overlay
Dim T_udp_data As Byte At Buffer + &H2A Overlay
Dim T_udp_data1 As Byte At Buffer + &H2B Overlay
Dim T_udp_data2 As Byte At Buffer + &H2C Overlay
Dim T_udp_data3 As Byte At Buffer + &H2D Overlay
Dim T_udp_data4 As Byte At Buffer + &H2E Overlay
Dim T_udp_data5 As Byte At Buffer + &H2F Overlay
Dim T_udp_data6 As Byte At Buffer + &H30 Overlay
Dim T_udp_data7 As Byte At Buffer + &H31 Overlay
Dim T_udp_data8 As Byte At Buffer + &H32 Overlay
Dim T_udp_data9 As Byte At Buffer + &H33 Overlay
Dim T_udp_data10 As Byte At Buffer + &H34 Overlay
Dim T_udp_data11 As Byte At Buffer + &H35 Overlay
Dim T_udp_data12 As Byte At Buffer + &H36 Overlay
Dim T_udp_data13 As Byte At Buffer + &H37 Overlay
Dim T_udp_data14 As Byte At Buffer + &H38 Overlay
Dim T_udp_data15 As Byte At Buffer + &H39 Overlay
Dim T_udp_data16 As Byte At Buffer + &H3A Overlay
Dim T_udp_data17 As Byte At Buffer + &H3B Overlay
Dim T_udp_data18 As Byte At Buffer + &H3C Overlay
Dim T_udp_data19 As Byte At Buffer + &H3D Overlay
Dim T_udp_data20 As Byte At Buffer + &H3E Overlay
Dim T_udp_data21 As Byte At Buffer + &H3F Overlay
Dim T_udp_data22 As Byte At Buffer + &H40 Overlay
Dim T_udp_data23 As Byte At Buffer + &H41 Overlay
Dim T_udp_data24 As Byte At Buffer + &H42 Overlay
Dim T_udp_data25 As Byte At Buffer + &H43 Overlay
Dim T_udp_data26 As Byte At Buffer + &H44 Overlay
Dim T_udp_data27 As Byte At Buffer + &H45 Overlay
Dim T_udp_data28 As Byte At Buffer + &H46 Overlay
Dim T_udp_data29 As Byte At Buffer + &H47 Overlay
Dim T_udp_data30 As Byte At Buffer + &H48 Overlay
Dim T_udp_data31 As Byte At Buffer + &H49 Overlay
Dim T_udp_data32 As Byte At Buffer + &H4A Overlay
Dim I_chksum32 As Long
Dim I_x As Word
Dim I_odd As Byte
Dim I_checksum16 As Word
Dim Result16 As Word
Dim Result16h As Byte At Result16 + 1 Overlay
Dim Result16l As Byte At Result16 Overlay
Dim I_value16 As Word
Dim I_value16h As Byte At I_value16 + 1 Overlay
Dim I_value16l As Byte At I_value16 Overlay
Dim Hulp1 As Byte
Dim Hulp2 As Word
Dim Hulp3 As Word
'Dim Hulp4 As Word
'variables with overlays
Dim Myip(4) As Byte
Dim My_ip As Long At Myip Overlay
Dim Mymac(6) As Byte
Declare Sub Enc28j60init
Declare Sub Enc28j60readcontrolregbyte(byval Register As Byte)
Declare Sub Enc28j60writecontrolregbyte(byval Register As Byte , Byval Value As Byte)
Declare Sub Enc28j60selectbank(byval Bank As Byte)
Declare Sub Enc28j60bitfield_set(byval Register As Byte , Byval Value As Byte)
Declare Sub Enc28j60bitfield_clear(byval Register As Byte , Byval Value As Byte)
Declare Sub Enc28j60readphyword(byval Phyregister As Byte)
Declare Sub Enc28j60writephyword(byval Phyregister As Byte , Byval Wdata As Word)
Declare Sub Enc28j60packetsend(byval Pcktlen As Word)
Declare Sub Enc28j60packetreceive
Declare Sub Enc28j60poll
Declare Sub Arpreply
Declare Sub Pingreply
Declare Sub Setip_id
Declare Sub Setst_mac
Declare Sub Udp_receive
Declare Sub Udp_checksum
Declare Sub Setipaddrs
Declare Sub Tcp
Declare Sub Echopacket
Declare Sub Ip_header_checksum
Declare Sub Icmp_checksum
'MAC address
Mymac(1) = &H43
Mymac(2) = &HC6
Mymac(3) = &HB3
Mymac(4) = &HF3
Mymac(5) = &HAB
Mymac(6) = &H9E
'IP address
Myip(1) = 192
Myip(2) = 168
Myip(3) = 0
Myip(4) = 61
'Configuration of the SPI-bus
Config Spi = Hard , Interrupt = Off , Data Order = Msb , Master = Yes , Polarity = Low , Phase = 0 , Clockrate = 4 , Noss = 0
'init the spi pins
Spiinit
Enc28j60_cs = 0
'reset ENC28J60
X = Enc28j60_soft_reset
Spiout X , 1
Enc28j60_cs = 1
Do
Call Enc28j60readcontrolregbyte(estat)
X = Enc28j60_data.estat_clkrdy
Loop Until X = 1
'clock from default divide/4 (6.25 Mhz) to divide/2 (12.5 Mhz)
Call Enc28j60writecontrolregbyte(ecocon , &B00000010)
Waitms 250
Print
Print "Starting Tux"
Call Enc28j60selectbank(3)
'EREVID
A(1) = &B000_10010
Enc28j60_cs = 0
Spiout A(1) , 1
Spiin A(1) , 2
Print "Enc28j60-version = " ; A(2)
Enc28j60_cs = 1
Call Enc28j60init
Do
Call Enc28j60poll
Loop
End
Sub Enc28j60init
'do bank 0 stuff
'initialize receive buffer
'16-bit transfers, must write low byte first
'set receive buffer start address
Nextpacketptr = Rxstart_init
Value = Low(rxstart_init)
Call Enc28j60writecontrolregbyte(erxstl , Value)
Value = High(rxstart_init)
Call Enc28j60writecontrolregbyte(erxsth , Value)
'set receive pointer address
Value = Low(rxstart_init)
Call Enc28j60writecontrolregbyte(erxrdptl , Value)
Value = High(rxstart_init)
Call Enc28j60writecontrolregbyte(erxrdpth , Value)
'set receive buffer end
Value = Low(rxstop_init)
Call Enc28j60writecontrolregbyte(erxndl , Value)
Value = High(rxstop_init)
Call Enc28j60writecontrolregbyte(erxndh , Value)
'set transmit buffer start
Value = Low(txstart_init)
Call Enc28j60writecontrolregbyte(etxstl , Value)
Value = High(txstart_init)
Call Enc28j60writecontrolregbyte(etxsth , Value)
'do bank 2 stuff
'enable MAC receive
Value = 0
Value.macon1_marxen = 1
Value.macon1_txpaus = 1
Value.macon1_rxpaus = 1
Call Enc28j60writecontrolregbyte(macon1 , Value)
'bring MAC out of reset
'enable automatic padding and CRC operations
Value = 0
Value.macon3_padcfg0 = 1
Value.macon3_txcrcen = 1
Value.macon3_frmlnen = 1
Call Enc28j60writecontrolregbyte(macon3 , Value)
'set inter-frame gap (non-back-to-back)
Call Enc28j60writecontrolregbyte(maipgl , &H12)
Call Enc28j60writecontrolregbyte(maipgh , &H0C)
'set inter-frame gap (back-to-back)
Call Enc28j60writecontrolregbyte(mabbipg , &H12)
'set the maximum packet size which the controller will accept
Value = Low(max_framelen)
Call Enc28j60writecontrolregbyte(mamxfll , Value)
Value = High(max_framelen)
Call Enc28j60writecontrolregbyte(mamxflh , Value)
'bank 3 stuff
Call Enc28j60writecontrolregbyte(maadr5 , Mymac(1))
Call Enc28j60writecontrolregbyte(maadr4 , Mymac(2))
Call Enc28j60writecontrolregbyte(maadr3 , Mymac(3))
Call Enc28j60writecontrolregbyte(maadr2 , Mymac(4))
Call Enc28j60writecontrolregbyte(maadr1 , Mymac(5))
Call Enc28j60writecontrolregbyte(maadr0 , Mymac(6))
'no loopback of transmitted frames
Call Enc28j60writephyword(phcon2 , Phcon2_hdldis)
'switch to bank 0
Call Enc28j60selectbank(0)
'enable interrupts
Value = 0
Value.eie_intie = 1
Value.eie_pktie = 1
Call Enc28j60bitfield_set(eie , Value)
'filters according to Guido
Call Enc28j60writecontrolregbyte(epmm0 , &H3F)
Call Enc28j60writecontrolregbyte(epmm1 , &H30)
Call Enc28j60writecontrolregbyte(epmcsl , &HF9)
Call Enc28j60writecontrolregbyte(epmcsh , &HF7)
Value = 0
Value.erxfcon_pmen = 1 'Pattern Match enable (ARP only)
Value.erxfcon_ucen = 1 'Unicast enable
Call Enc28j60bitfield_set(erxfcon , Value)
Value = 0
Value.erxfcon_bcen = 1 'Broadcast disable
Call Enc28j60bitfield_clear(erxfcon , Value)
'CRC check is enabled by default
'Something is wrong with the Broadcast fliter (or the whole theory), it seems
'like every packet is coming in
'enable packet reception
Value = 0
Value.econ1_rxen = 1
Call Enc28j60bitfield_set(econ1 , Value)
'Reset transmit logic
Value = 0
Value.econ1_txrst = 1
Call Enc28j60bitfield_set(econ1 , Value)
Call Enc28j60bitfield_clear(econ1 , Value)
End Sub
Sub Enc28j60selectbank(bank As Byte)
'get ECON1 (BSEL1 en BSEL0)
A(1) = &B000_11111
Enc28j60_cs = 0
Spiout A(1) , 1
Spiin A(1) , 2
Enc28j60_cs = 1
A(2) = A(2) And &B1111_1100 'strip bank part
A(2) = A(2) Or Bank
A(1) = &B010_11111
Enc28j60_cs = 0
Spiout A(1) , 2
Enc28j60_cs = 1
End Sub
Sub Enc28j60writecontrolregbyte(register As Byte , Value As Byte)
Bank = 0
If Register.7 = 1 Then Bank = 2
If Register.6 = 1 Then Bank = Bank + 1
Register = Register And &B00011111
Call Enc28j60selectbank(bank)
Register.6 = 1 'to get a 010_register
A(1) = Register
A(2) = Value
Enc28j60_cs = 0
Spiout A(1) , 2
Enc28j60_cs = 1
End Sub
Sub Enc28j60readcontrolregbyte(register As Byte)
Local Mcphy As Byte
Bank = 0
Mcphy = 0
If Register.7 = 1 Then Bank = 2
If Register.6 = 1 Then Bank = Bank + 1
If Register.5 = 1 Then Mcphy = 1
Register = Register And &B00011111
Call Enc28j60selectbank(bank)
A(1) = Register
Enc28j60_cs = 0
Spiout A(1) , 1
Spiin A(1) , 3
Enc28j60_cs = 1
'Depending of register (E, MAC, MII) yes or no dummybyte
If Mcphy = 1 Then
Enc28j60_data = A(2)
Else
Enc28j60_data = A(3)
End If
End Sub
Sub Enc28j60bitfield_set(register As Byte , Value As Byte)
Bank = 0
If Register.7 = 1 Then Bank = 2
If Register.6 = 1 Then Bank = Bank + 1
Register = Register And &B00011111
Call Enc28j60selectbank(bank)
Register = Register Or &B100_00000
A(1) = Register
A(2) = Value
Enc28j60_cs = 0
Spiout A(1) , 2
Enc28j60_cs = 1
End Sub
Sub Enc28j60bitfield_clear(register As Byte , Value As Byte)
Bank = 0
If Register.7 = 1 Then Bank = 2
If Register.6 = 1 Then Bank = Bank + 1
Register = Register And &B00011111
Call Enc28j60selectbank(bank)
Register = Register Or &B101_00000
A(1) = Register
A(2) = Value
Enc28j60_cs = 0
Spiout A(1) , 2
Enc28j60_cs = 1
End Sub
Sub Enc28j60readphyword(phyregister As Byte)
'set the right address and start the register read operation
Call Enc28j60writecontrolregbyte(miregadr , Phyregister)
Call Enc28j60writecontrolregbyte(micmd , Micmd_miird)
'wait until the PHY read complets
Do
Call Enc28j60readcontrolregbyte(mistat)
Loop Until Enc28j60_data.mistat_busy = 0
'quit reading
Call Enc28j60writecontrolregbyte(micmd , 0)
'get data value
Call Enc28j60readcontrolregbyte(mirdl)
Wdata = Enc28j60_data
Shift Wdata , Left , 8
Call Enc28j60readcontrolregbyte(mirdh)
Wdata = Wdata + Enc28j60_data
End Sub
Sub Enc28j60writephyword(phyregister As Byte , Wdata As Word)
Call Enc28j60readphyword(phyregister)
Local Temp As Byte
'set the PHY register address
Call Enc28j60writecontrolregbyte(miregadr , Phyregister)
Call Enc28j60readcontrolregbyte(miregadr)
Temp = Miregadr
Value = Low(wdata)
Call Enc28j60writecontrolregbyte(miwrl , Value)
Value = High(wdata)
Call Enc28j60writecontrolregbyte(miwrh , Value)
Do
Call Enc28j60readcontrolregbyte(mistat)
Loop Until Enc28j60_data.mistat_busy = 0
End Sub
Sub Enc28j60poll
Call Enc28j60readcontrolregbyte(epktcnt)
If Enc28j60_data > 0 Then
Call Enc28j60packetreceive
End If
End Sub
Sub Enc28j60packetreceive
Reset Led
Local Wtemp As Word
'set the read pointer to the start of the received packet
Value = Low(nextpacketptr)
Call Enc28j60writecontrolregbyte(erdptl , Value)
Value = High(nextpacketptr)
Call Enc28j60writecontrolregbyte(erdpth , Value)
Enc28j60_cs = 0
'Send Read Buffer Memory command
Spdr = &H3A
Do
Loop Until Spsr.spif = 1
'Get the first 6 byte (3 word: Nextpacketptr, Packetlength, Rxstat)
For X = 1 To 6
Spdr = &HFF 'SPI read
Do
Loop Until Spsr.spif = 1 'SPI ready
Buffer(x) = Spdr
Next X
Nextpacketptr = Buffer(2) * 256
Nextpacketptr = Nextpacketptr + Buffer(1)
Length = Buffer(4) * 256
Length = Length + Buffer(3)
Rxstat = Buffer(6) * 256
Rxstat = Rxstat + Buffer(5)
'Get the payload
Length = Length - 4 'Discard CRC
For X = 1 To Length
Spdr = &HFF 'SPI read
Do
Loop Until Spsr.spif = 1 'SPI ready
Buffer(x) = Spdr
Next X
Enc28j60_cs = 1
'move the rx read pointer to the start of the next received packet
'this frees the memory we just read out
Value = Low(nextpacketptr)
Call Enc28j60writecontrolregbyte(erxrdptl , Value)
Value = High(nextpacketptr)
Call Enc28j60writecontrolregbyte(erxrdpth , Value)
'decrement the packet counter indicate we are done with this packet
Value = 0
Value.econ2_pktdec = 1
Call Enc28j60bitfield_set(econ2 , Value)
Set Led
'Handle the packet
If Buffer(13) = &H08 Then
If Buffer(14) = &H06 Then 'Type:ARP
If Buffer(21) = &H00 Then 'ARP request
If Buffer(22) = &H01 Then 'ARP request
If Buffer(39) = Myip(1) Then 'ARP for us
If Buffer(40) = Myip(2) Then
If Buffer(41) = Myip(3) Then
If Buffer(42) = Myip(4) Then
Call Arpreply
End If
End If
End If
End If
End If
End If
End If
If Buffer(14) = &H00 Then 'Type:IP
If Buffer(15) = &H45 Then 'We handle only simple IP packets
If Buffer(21) = 0 Then 'We handle only non fragmented packets
'If Buffer(31) = Ipaddr0 Then 'Ip packet for us
'If Buffer(32) = Ipaddr1 Then
'If Buffer(33) = Ipaddr2 Then
'If Buffer(34) = Ipaddr3 Then
If Buffer(24) = 1 Then 'Protocol:ICMP
If Buffer(35) = &H08 Then 'ICMP echo request
Call Pingreply
End If
End If
If Buffer(24) = 17 Then 'Protocol:UDP
Call Udp_receive 'werkt wel
End If
If Buffer(24) = 6 Then 'Protocol:TCP
Call Tcp 'werkt niet
End If
'End If
'End If
'End If
'End If
End If
End If
End If
End If
End Sub
Sub Enc28j60packetsend(pcktlen As Word)
'Load packet into the ENC
Enc28j60_cs = 0
Spdr = Enc28j60_write_buf_mem
Do
Loop Until Spsr.spif = 1
Spdr = &B000_1110 'per packet byte
Do
Loop Until Spsr.spif = 1
For X = 1 To Pcktlen
Spdr = Buffer(x)
Do
Loop Until Spsr.spif = 1
Next X
Enc28j60_cs = 1
'Minimum packet length is 60
If Pcktlen < 60 Then Pcktlen = 60
'Reset transmit logic
Value = 0
Value.econ1_txrst = 1
Call Enc28j60bitfield_set(econ1 , Value)
Call Enc28j60bitfield_clear(econ1 , Value)
'set the write pointer to start of transmit buffer area
Value = Low(txstart_init)
Call Enc28j60writecontrolregbyte(ewrptl , Value)
Value = High(txstart_init)
Call Enc28j60writecontrolregbyte(ewrpth , Value)
'set the TXND pointer to correspond to the packet size given
Value = Low(txstart_init)
Value = Value + Low(pcktlen)
Call Enc28j60writecontrolregbyte(etxndl , Value)
Value = High(txstart_init)
Value = Value + High(pcktlen)
Call Enc28j60writecontrolregbyte(etxndh , Value)
'write per-packet control byte has been put in the writeroutine
'send the contents of the transmit buffer onto the network
Value = 0
Value.econ1_txrts = 1
Call Enc28j60bitfield_set(econ1 , Value)
End Sub
Sub Arpreply
'The original request packet is in the buffer, we just change some things
Local I As Byte
'Swap MAC addresses
Call Setst_mac
'Copy target MAC in ARP packet - starting at pos 33, copy from pos 1
For I = 1 To 6
Buffer(32 + I) = Buffer(i)
Next I
'Set target IP in ARP packet - starting at pos 39, original starting at pos 29
For I = 1 To 4
Buffer(38 + I) = Buffer(28 + I)
Next I
'Copy source MAC to ARP packet pos 23 from pos 7
For I = 1 To 6
Buffer(22 + I) = Buffer(6 + I)
Next I
'Set source IP to ARP packet pos 29
Buffer(29) = Myip(1)
Buffer(30) = Myip(2)
Buffer(31) = Myip(3)
Buffer(32) = Myip(4)
'Set ARP type from Request to Reply
Buffer(22) = 2
'Send the reply packet
Call Enc28j60packetsend(42)
End Sub
Sub Pingreply
Local Packetlength As Word
Packetlength = Buffer(17) * 256
Packetlength = Packetlength + Buffer(18)
Packetlength = Packetlength + 13 'We are going to calculate the checksum till the end of packet (IP length + 14 byte of the ethernet stuff), -1 to get word start
'set echo reply
T_icmp_type = &H00
T_icmp_code = &H00
'setup the IP-header
Call Setipaddrs
Call Icmp_checksum
Packetlength = Packetlength + 1
'Send the reply packet
Call Enc28j60packetsend(packetlength)
End Sub
Sub Setip_id
Buffer(19) = High(ip_id)
Buffer(20) = Low(ip_id)
Ip_id = Ip_id + 1
End Sub
Sub Setst_mac
Local I As Byte
'Set target MAC in ethernet frame - starting at pos 1, original starting at pos 7
For I = 1 To 6
Buffer(i) = Buffer(6 + I)
Next I
'Set source MAC in ethernet frame, pos 7
Buffer(7) = Mymac(1)
Buffer(8) = Mymac(2)
Buffer(9) = Mymac(3)
Buffer(10) = Mymac(4)
Buffer(11) = Mymac(5)
Buffer(12) = Mymac(6)
End Sub
' Routine to handle UDP-traffic
'
Sub Udp_receive
Print "UDP_Receive"
Local Udp_port As Word
Local Udp_porth As Byte
Local Udp_portl As Byte
Udp_porth = &H88
Udp_portl = &H13
Udp_port = Udp_porth
Shift Udp_port , Left , 8
Udp_port = Udp_port + Udp_portl
'From within a VB-program
'non-echo on PORT 5000
If T_udp_destport = Udp_port Then
Select Case T_udp_data
Case &H00 : Print "Action A"
Case &H01 : Print "Action B"
Case &H02 : Print "Action C"
Case &H03 : Print "Action D"
Case &H04 : Print "Action E"
Case Else : Print "Action F"
End Select
Exit Sub
End If
'echo on PORT 7
If T_udp_destport = &H0700 Then
'Build The Ip Header
Call Setipaddrs
'swap the UDP source and destinations port
Swap T_udp_srcport0 , T_udp_destport0
Swap T_udp_srcport1 , T_udp_destport1
Call Udp_checksum
Call Echopacket
End If
End Sub
' Routine to calculate the IP-checkum
'
Sub Udp_checksum
'Local Hulp5 As Word
'Local Hulp6 As Word
T_udp_chksum = &H00
'checksum TCP header
I_chksum32 = 0
I_value16h = T_ip_srcaddr0
I_value16l = T_ip_srcaddr1
I_chksum32 = I_chksum32 + I_value16
I_value16h = T_ip_srcaddr2
I_value16l = T_ip_srcaddr3
I_chksum32 = I_chksum32 + I_value16
I_value16h = T_ip_destaddr0
I_value16l = T_ip_destaddr1
I_chksum32 = I_chksum32 + I_value16
I_value16h = T_ip_destaddr2
I_value16l = T_ip_destaddr3
I_chksum32 = I_chksum32 + I_value16
'proto
I_chksum32 = I_chksum32 + T_ip_proto
'packet length
I_value16h = T_udp_len0
I_value16l = T_udp_len1
I_chksum32 = I_chksum32 + I_value16
'misschien vanaf hier TCPCHECKSUM + extra waarden meegeven
I_odd = T_udp_len1 Mod 2
Result16h = T_udp_len0
Result16l = T_udp_len1
'udp_srcport0 = packet(&h23)
'Hulp5 = Highw(i_chksum32)
'Hulp6 = I_chksum32
'I_checksum16 = Tcpchecksum(buffer(&H23) , Result16 , Hulp5 , Hulp6)
Hulp1 = &H23
Hulp2 = &H23 + Result16
Hulp2 = Hulp2 - 2
For I_x = Hulp1 To Hulp2 Step 2
I_value16h = Buffer(i_x)
Hulp3 = I_x + 1
I_value16l = Buffer(hulp3)
I_chksum32 = I_chksum32 + I_value16
Next I_x
If I_odd = 1 Then
Incr Hulp2
I_value16h = Buffer(hulp2)
I_value16l = 0
I_chksum32 = I_chksum32 + I_value16
End If
I_checksum16 = Highw(i_chksum32)
I_checksum16 = I_checksum16 + I_chksum32 ' only 16 lower bits of i_chksum32 is taken...
I_checksum16 = Not I_checksum16
T_udp_chksum0 = High(i_checksum16)
T_udp_chksum1 = Low(i_checksum16)
End Sub
'
' Routine to calculate a IP-header checksum
'
Sub Ip_header_checksum
Local Ip_checksum16 As Word
Local Ip_header_length As Byte
'Calculate the IP header checksum
T_ip_hdr_cksum = &H00 'Calc starts with chksum=0
'Calculate IP header length
Ip_header_length = T_ip_vers_len And &H0F 'Number of 32 bit words
Ip_header_length = 4 * Ip_header_length 'Calc number of bytes
Ip_checksum16 = Tcpchecksum(buffer(15) , Ip_header_length )
'Store the checksum value in the packet buffer
T_ip_hdr_cksum1 = High(ip_checksum16)
T_ip_hdr_cksum0 = Low(ip_checksum16)
End Sub
' Routine to calculate a ICMP-checksum
'
Sub Icmp_checksum
'Clear the ICMP checksum before starting calculation
T_icmp_cksum = &H00
'Calculate the ICMP checksum
I_header_length = T_ip_pktlen1 - 20 'See if odd number of bytes
I_checksum16 = Tcpchecksum(buffer(35) , I_header_length ) 'built-in way
T_icmp_cksum1 = High(i_checksum16)
T_icmp_cksum0 = Low(i_checksum16)
End Sub
' Routine to echo packet
'
Sub Echopacket
'Print "Echopacket"
'packetlengte
Hulp2 = T_udp_len0 * 256
Hulp2 = Hulp2 + T_udp_len1
Hulp2 = Hulp2 + 34
Call Enc28j60packetsend(hulp2)
End Sub
' Routine to handle the source/destination address
'
Sub Setipaddrs
T_ip_destaddr = T_ip_srcaddr
'make ethernet module IP address source address
T_ip_srcaddr = My_ip
Call Setst_mac
Call Ip_header_checksum
End Sub
Sub Tcp
Print "TCP*************************************"
End Sub
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