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KISSModule.c
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462 lines (332 loc) · 9 KB
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//
// KISS Code for ARDOPC.
//
// Allows Packet modes and ARDOP to coexist in same program
// Mainly for Teensy Version.
//
// Teensy will probably only support KISS over i2c,
// but for testing Windows version uses a real com port
// New idea is to support via SCS Host Channel 250, but will
// probably leave serial/i2c support in
// Now supports KISS over SCS Channel 250 or a KISS over TCP Connection
#ifdef WIN32
#define _CRT_SECURE_NO_DEPRECATE
#define _USE_32BIT_TIME_T
#include <windows.h>
#include <winioctl.h>
#else
#define HANDLE int
#define SOCKET int
#include <sys/types.h>
#ifndef TEENSY
#include <sys/socket.h>
#endif
#endif
#include "ARDOPC.h"
#define FEND 0xC0
#define FESC 0xDB
#define TFEND 0xDC
#define TFESC 0xDD
HANDLE OpenCOMPort(VOID * pPort, int speed, BOOL SetDTR, BOOL SetRTS, BOOL Quiet, int Stopbits);
int ReadCOMBlock(HANDLE fd, char * Block, int MaxLength);
VOID ProcessKISSBlock(UCHAR * KISSBUFFER, int Len);
VOID EncodePacket(UCHAR * Data, int Len);
VOID ProcessKISSBytes(UCHAR * RXBUFFER, int Read);
void PacketStartTX();
VOID EmCRCStuffAndSend(UCHAR * Msg, int Len);
VOID ProcessKISSControlFrame();
VOID ptkSessionBG();
HANDLE hDevice;
char KISSPORTNAME[80] = ""; // for now just support over Host Interface;
HANDLE hControl;
typedef struct _SERIAL_STATUS {
unsigned long Errors;
unsigned long HoldReasons;
unsigned long AmountInInQueue;
unsigned long AmountInOutQueue;
BOOL EofReceived;
BOOL WaitForImmediate;
} SERIAL_STATUS,*PSERIAL_STATUS;
// Buffers for KISS frames to and from the host. Uses cyclic buffers
// Size must be modulo 2 so we can AND with mask to make cyclic
#define KISSBUFFERSIZE 4096
#define KISSBUFFERMASK 4095
// KISS bytes from a serial, i2c or Host Mode link are placed in
// the cyclic TX buffer as received. As we can only transmit complete
// packets, we need some indicator of how many packets there are
// in the buffer. Or maybe just how many FENDS, especially if
// we remove any extra ones (just leave one at end of frame)
UCHAR KISSRXBUFF[KISSBUFFERSIZE]; // Host to RF
int KRXPutPtr = 0;
int KRXGetPtr = 0;
int FENDCount = 0;
UCHAR KISSTXBUFF[KISSBUFFERSIZE]; // RF to Host
int KTXPutPtr = 0;
int KTXGetPtr = 0;
UCHAR KISSBUFFER[500]; // Long enough for stuffed KISS frame
UCHAR * RXMPTR = &KISSBUFFER[0];
int KISSLength = 0;
BOOL ESCFlag = FALSE;
HANDLE KISSHandle = 0;
extern BOOL PacketHost;
int TXDelay = 500;
extern SOCKET PktSock;
extern BOOL PKTCONNECTED;
BOOL KISSInit()
{
// char * Baud = strlop(KISSPORTNAME, ',');
#ifdef WIN32
if (KISSPORTNAME[0])
KISSHandle = OpenCOMPort(KISSPORTNAME, 19200, FALSE, FALSE, FALSE, 0);
if (KISSHandle)
WriteDebugLog(LOGALERT, "KISS interface Using port %s", KISSPORTNAME);
#endif
return TRUE;
}
VOID KISSPoll()
{
#ifdef WIN32
unsigned long Read;
unsigned char RXBuffer[512];
if (KISSHandle == NULL)
return;
Read = ReadCOMBlock(KISSHandle, RXBuffer, 512);
if (Read == 0)
return;
ProcessKISSBytes(RXBuffer, Read);
#endif
}
VOID ProcessPacketBytes(UCHAR * Buffer, int Read)
{
// Called when frame received on TCP Packet Connection. Could be for
// KISS or ARDOP Packet Session mode
// Assumes that Complete KISS or Host packet will be received (pretty safe
// with TCP (I hope!)
// But could be more than one in buffer
if (Buffer[0] == 192)
ProcessKISSBytes(Buffer, Read);
else
{
while (Read > 0)
{
int Used = Buffer[2] + 4;
ProcessPacketHostBytes(Buffer, Read);
Read -= Used;
if (Read > 0)
{
memmove(Buffer, &Buffer[Used], Read);
}
}
}
}
VOID ProcessKISSBytes(UCHAR * RXBuffer, int Read)
{
// Store in cyclic buffer, counting FENDS so we know if we
// have a full frame in the buffer
UCHAR c;
WriteDebugLog(LOGALERT, "Queuing %d Packet Bytes", Read);
while (Read--)
{
c = *(RXBuffer++);
if (c == FEND)
FENDCount++;
KISSRXBUFF[KRXPutPtr++] = c;
KRXPutPtr &= KISSBUFFERMASK;
if (KRXPutPtr == KRXGetPtr) // should never happen, but nasty if it does
FENDCount = 0; // Buffer is now empty
}
}
VOID ProcessKISSByte(UCHAR c)
{
// Store in cyclic buffer, counting FENDS so we know if we
// have a full frame in the buffer
if (c == FEND)
FENDCount++;
KISSRXBUFF[KRXPutPtr++] = c;
KRXPutPtr &= KISSBUFFERMASK;
if (KRXPutPtr == KRXGetPtr) // should never happen, but nasty if it does
FENDCount = 0; // Buffer is now empty
}
BOOL GetNextKISSFrame()
{
// Called to get a frame to send, either before starting or
// when current frame has been sent (for back to back sends)
unsigned char c;
UCHAR * RXMPTR;
ptkSessionBG(); // See if any session events to process
if (KRXPutPtr == KRXGetPtr) // Nothing to send
{
ptkSessionBG(); // See if any session events to process
if (KRXPutPtr == KRXGetPtr) // Still nothing to send
return FALSE; // Buffer empty
}
if (FENDCount < 2)
return FALSE; // Not a complete KISS frame
if (KISSRXBUFF[KRXGetPtr++] != FEND)
{
// First char should always be FEND. If not Buffer has
// wrapped. Remove the partial frame and discard
while (KRXPutPtr != KRXGetPtr)
{
if (KISSRXBUFF[KRXGetPtr++] == FEND)
{
// Found a FEND.
KRXGetPtr &= KISSBUFFERMASK;
FENDCount --;
// Next should also be a FEND, but can check next time round
// As this shouldn't happen often, just exit and get frame next time
return FALSE;
}
}
// no FENDS in buffer!!!
FENDCount = 0; // Buffer is now empty
return FALSE;
}
// First char is a FEND, and get pointer points to next char
RXMPTR = &KISSBUFFER[0]; // Initialise buffer pointer
KRXGetPtr &= KISSBUFFERMASK;
FENDCount --;
while (KRXPutPtr != KRXGetPtr)
{
c = KISSRXBUFF[KRXGetPtr++];
KRXGetPtr &= KISSBUFFERMASK;
if (ESCFlag)
{
//
// FESC received - next should be TFESC or TFEND
ESCFlag = FALSE;
if (c == TFESC)
c = FESC;
if (c == TFEND)
c = FEND;
}
else
{
switch (c)
{
case FEND:
//
// Either start of message or message complete
//
if (RXMPTR == &KISSBUFFER[0])
{
// Start of Message. Shouldn't Happen
FENDCount--;
continue;
}
FENDCount--;
KISSLength = RXMPTR - &KISSBUFFER[0];
// Process Control Frames here
if (KISSBUFFER[0] != 0 && KISSBUFFER[0] != 6 && KISSBUFFER[0] != 12)
{
ProcessKISSControlFrame();
return FALSE;
}
return TRUE; // Got complete frame in KISSBUFFER
case FESC:
ESCFlag = TRUE;
continue;
}
}
//
// Ok, a normal char
//
*(RXMPTR++) = c;
if (RXMPTR == &KISSBUFFER[499])
RXMPTR--; // Protect Buffer
}
// We shouldnt get here, as it means FENDCOUNT is wrong. Reset it
FENDCount = 0;
return FALSE;
}
// Called by SCS Host Interface
BOOL CheckKISS(UCHAR * SCSReply)
{
int Length = KTXPutPtr - KTXGetPtr;
int n;
int get = KTXGetPtr;
if (Length == 0)
return FALSE;
if (Length < 0)
Length += KISSBUFFERSIZE;
// Return up to 256 chars
if (Length > 256)
Length = 256;
n = 0;
while (n < Length)
{
SCSReply[n++ + 5] = KISSTXBUFF[get++];
get &= KISSBUFFERMASK;
}
KTXGetPtr = get;
SCSReply[2] = 250;
SCSReply[3] = 7;
SCSReply[4] = Length - 1;
EmCRCStuffAndSend(SCSReply, Length + 5);
return TRUE;
}
VOID ProcessKISSControlFrame()
{
}
VOID SendAckModeAck()
{
KISSTXBUFF[KTXPutPtr++] = FEND;
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = 12; // AckMode opcode
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = KISSBUFFER[1];
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = KISSBUFFER[2];
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = FEND;
// If using KISS over TCP, send it
#ifndef TEENSY
// If Using TCP, send it
if (pktport)
{
if (PKTCONNECTED)
send(PktSock, KISSTXBUFF, KTXPutPtr, 0);
KTXPutPtr = 0;
}
#endif
}
void SendFrametoHost(unsigned char *data, unsigned dlen)
{
KISSTXBUFF[KTXPutPtr++] = FEND;
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = 0; // Data
KTXPutPtr &= KISSBUFFERMASK;
for (; dlen > 0; dlen--, data++)
{
if (*data == FEND)
{
KISSTXBUFF[KTXPutPtr++] = FESC;
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = TFEND;
KTXPutPtr &= KISSBUFFERMASK;
}
else if (*data == FESC)
{
KISSTXBUFF[KTXPutPtr++] = FESC;
KTXPutPtr &= KISSBUFFERMASK;
KISSTXBUFF[KTXPutPtr++] = TFESC;
KTXPutPtr &= KISSBUFFERMASK;
}
else
{
KISSTXBUFF[KTXPutPtr++] = *data;
KTXPutPtr &= KISSBUFFERMASK;
}
}
KISSTXBUFF[KTXPutPtr++] = FEND;
KTXPutPtr &= KISSBUFFERMASK;
#ifndef TEENSY
// If Using TCP, send it
if (pktport)
{
if (PKTCONNECTED)
send(PktSock, KISSTXBUFF, KTXPutPtr, 0);
KTXPutPtr = 0;
}
#endif
}