/*/////////////////////////////////////////////////////////////////////////////
File Name : PPP.C
Author : Rene Trenado
Location : Motorola Applications Lab, Baja California
Date Created : September 2000
Current Revision : 0.0
Notes : This file contains the code for the PPP module
/////////////////////////////////////////////////////////////////////////////*/
//#include <iogp20.h>
#include <string.h>
//#include "CommDrv.h"
#include "10_3_ppp_test.h"
//#include "IP.h"
//#include "Udp.h"
//#include "ICMP.h"
const char * User = "MyName"; // Username of ISP account
const char * Password = "MyPassword"; // Password of username
/************************* Private Functions *************************/
static void HandleLCPOptions (void);
static void HandleIPCPOptions (void);
static WORD PPPfcs16 (WORD fcs, BYTE *cp, int len);
static void RejectProtocol (BYTE *InBuffer);
////////////////////// Protected ROM Data /////////////////////////
static const BYTE PPPData [] = {
0xff,0x03,0xc0,0x21,0x02,0x01,0x00,0x04,0x00,0x00
};
static const BYTE LCPTerminate[] = {
0xff,0x03,0xc0,0x21,0x05,0x04,0x00,0x04,0x80,0xfe
};
static const unsigned short fcstab[256] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
///////////////////// Public R A M Data /////////////////////////////
volatile BYTE PPPStatus = 0;
BYTE InBuffer [PPP_BUFFER_SIZE + 1]; /// Input Buffer for PPP data
BYTE OutBuffer[PPP_BUFFER_SIZE + 1]; /// Output Buffer for PPP data
///////////////////// Protected R A M Data /////////////////////////
static BYTE *PPP_Packet = InBuffer;
static volatile BYTE FrameSize = 0;
static EventProc PPPEntryProc;
/***********************************************************************
Function : PPPInit
Parameters : None
Date : September 2000
Desc : Initialize the PPP Module
***********************************************************************/
void PPPInit (void) {
PPPStatus |= ReSync;
}
/***********************************************************************
Function : PPPGetInputBuffer
Parameters : None
Date : September 2000
Desc : Returns a PPP Input Buffer pointer to caller
***********************************************************************/
BYTE *PPPGetInputBuffer (void) {
return &InBuffer[0];
}
/***********************************************************************
Function : PPPGetOutputBuffer
Parameters : None
Date : September 2000
Desc : Returns a pointer to PPP Output Buffer to caller
***********************************************************************/
BYTE *PPPGetOutputBuffer (void) {
return &OutBuffer[0];
}
/***********************************************************************
Function : PPPfcs16
Parameters : fcs: current fcs
cp: pointer to PPP data
len: size of PPP data
Date : September 2000
Desc : Calculate a new fcs given the current fcs and the new data.
***********************************************************************/
static WORD PPPfcs16 (WORD fcs, BYTE *cp, int len) {
while (len--)
fcs = (fcs >> 8) ^ fcstab[(fcs ^ *cp++) & 0xff];
return (fcs);
}
/***********************************************************************
Function : public PPPGetChecksum
Parameters : cp: A pinter to the PPP Packet
len: Size of PPP Packet
Date : September 2000
Desc : Returns the Checksum of the PPP Packet pointed by cp
***********************************************************************/
WORD PPPGetChecksum (register unsigned char *cp, register int len) {
return ~PPPfcs16( PPPINITFCS16, cp, len );
}
/***********************************************************************
Function : ProcPPPReceive
Parameters : A Byte character to stream in a PPP Packet
Date : August 2000
Desc : This function process a BYTE following HDLC - PPP
specifications. The Async event on input driver should
call this function (usually the COMM ISR).
***********************************************************************/
void ProcPPPReceive (register BYTE c) {
PPPStatus |= ByteRx;
if (PPPStatus & IsFrame) return;
if (PPPStatus & ReSync) {
if (c != 0x7E) return;
PPPStatus &= ~ReSync;
FrameSize = 0;
}
if (PPPStatus & IsESC) {
PPP_Packet [FrameSize++] = 0x20 ^ c;
PPPStatus &= ~IsESC;
}
else {
switch (c) {
case ESC: //// Special ESC (0x7D) Character received
PPPStatus |= IsESC;
break;
case END: //// Special END (0x7E) Character received
if (FrameSize > 0) { //// Avoid cero length packets (0x7F - 0x7F conditions);
PPP_Packet [FrameSize] = 0;
PPPStatus |= IsFrame; //// Signal Frame availability
}
break;
default:
PPP_Packet [FrameSize++] = c;
if (FrameSize > (PPP_BUFFER_SIZE - 6)) {
FrameSize = 0;
PPPStatus |= ReSync;
}
break;
}
}
}
/***********************************************************************
Function : PPPSend
Parameters : Buffer: A pointer to a buffer containing the PPP packet to send
len: the size of the PPP packet
Date : September 2000
Desc : Sends a BYTE array of len length following HDLC - PPP specifications
***********************************************************************/
void ProcPPPSend (BYTE *Buffer, BYTE len) {
WORD Checksum = 0;
Checksum = PPPGetChecksum (Buffer, Buffer[7] + 4);
Buffer [Buffer[7]+4] = Checksum & 0xFF;
Buffer [Buffer[7]+5] = (Checksum >> 8) & 0xFF;
WriteComm (0x7E);
while (len--) {
if ((signed char)*Buffer < (signed char)0x20) {
WriteComm (0x7D);
WriteComm (*Buffer ^ 0x20);
} else {
switch (*Buffer) {
case 0x7E:
WriteComm (0x7D);
WriteComm (0x5E);
break;
case 0x7D:
