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J1708_T4.cpp
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J1708_T4.cpp
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/*
J1708_T4.cpp
Written by David Nnaji @ Colorado State University, April 21st, 2022
Github:
https://github.com/davidnnaji
Do you find this library useful? Let me know online!
Description:
A J1708 gateway utility library.
Compatible with Teensy 4.0 only.
Liscense:
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/
// Dependencies
#include <J1708_T4.h>
// #include <EEPROM.h>
// Utility Functions
String getValue(String data, char separator, int index){
int found = 0;
int strIndex[] = { 0, -1 };
int maxIndex = data.length() - 1;
for (int i = 0; i <= maxIndex && found <= index; i++) {
if (data.charAt(i) == separator || i == maxIndex) {
found++;
strIndex[0] = strIndex[1] + 1;
strIndex[1] = (i == maxIndex) ? i+1 : i;
}
}
return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}
uint32_t hex2int(char *hex) {
uint32_t val = 0;
while (*hex) {
// get current character then increment
uint8_t byte = *hex++;
// transform hex character to the 4bit equivalent number, using the ascii table indexes
if (byte >= '0' && byte <= '9') byte = byte - '0';
else if (byte >= 'a' && byte <='f') byte = byte - 'a' + 10;
else if (byte >= 'A' && byte <='F') byte = byte - 'A' + 10;
// shift 4 to make space for new digit, and add the 4 bits of the new digit
val = (val << 4) | (byte & 0xF);
}
return val;
}
int string2Hex(String data){
if (data.length()==2){
char temp[4];
for (int i=0;i<2;i++){
if (!isHexadecimalDigit(data[i])){
return -1;
}
}
data.toCharArray(temp,4);
return hex2int(temp);
}
else {
return -1;
}
}
// Setup Functions
bool J1708::begin(int port_number, int baud, int rx_led, int tx_led){
/*
Setup UART Connection
1 - Reserved Print console
2 - Reserved Future use
3 - Default J1708
4 - Secondary J1708
5 - Free
6 - -
7 - -
*/
if (port_number==3){
_streamRef = &Serial3;
_streamRef->begin(baud);
selfPN = port_number;
}
else if (port_number==4){
_streamRef = &Serial4;
_streamRef->begin(baud);
Serial4.begin(baud);
selfPN = port_number;
tx_led=6;
rx_led=5;
}
else if (port_number==5){
_streamRef = &Serial5;
_streamRef->begin(baud);
Serial5.begin(baud);
selfPN = port_number;
tx_led=4;
rx_led=3;
}
else{
return false;
}
//Rx Pin Configuration
RxLED = rx_led;
pinMode(RxLED,OUTPUT);
digitalWrite(RxLED,RxLEDState);
//Tx Pin Configuration
TxLED = tx_led;
pinMode(TxLED,OUTPUT);
digitalWrite(TxLED,TxLEDState);
pinMode(SEC_ERR_LED,OUTPUT);
digitalWrite(SEC_ERR_LED,SEC_ERR_LEDState);
selfACL[selfMID]=true;
return true;
}
void J1708::link(J1708 *_j1708Object){
_j1708Ref = _j1708Object;
J1708Object_Linked = true;
Rx_Forwarding = true;
}
void J1708::unlink(){
J1708Object_Linked = false;
Rx_Forwarding = false;
delete _j1708Ref;
}
// Primary Functions
uint8_t J1708::J1708Rx(uint8_t (&J1708RxFrame)[RxBufferSize]){
if (_streamRef->available()){
J1708Timer = 0; //Reset the RX message timer for J1708 message framing
J1708TxTimer = 0;
J1708ByteCount++; // Increment the recieved byte counts
TotalByteCount++; // Include self transmitted or forwarded messages in calculation
rx_busy = true;
if (J1708ByteCount < sizeof(J1708RxBuffer)){ //Ensure the RX buffer can handle the new messages
J1708RxBuffer[J1708ByteCount] = _streamRef->read();
J1708Checksum += J1708RxBuffer[J1708ByteCount];
}
else{
//This is what we do if we don't have room in the RX buffer., "J1708 Buffer Overflow"
ERR2_RxOverflow = true;
ERR_Counter++;
ERR2_Counter++;
J1708ByteCount = 0;
rx_busy = false;
J1708TxTimer = 0;
if (ERR2_MID_Hold<0){
ERR2_MID_Hold = J1708RxBuffer[1];
}
if (ShowErrors){
Serial.print("ERR2:"); //debug
Serial.print("[");Serial.print(ERR_Counter);Serial.println("] "); //debug
}
}
}
//Check to see if a message has been framed?
if (J1708Timer > twelvebit && J1708ByteCount > 0){
J1708FrameLength = J1708ByteCount;
J1708ByteCount = 0; //reset the counter
J1708Checksum -= J1708RxBuffer[J1708FrameLength]; //remove the received Checksum byte (last one)
J1708Checksum = (~J1708Checksum + 1) & 0xFF; // finish calculating the checksum
bool J1708ChecksumOK = J1708Checksum == J1708RxBuffer[J1708FrameLength];
if (ERR2_RxOverflow){
//Spilled over data from ERR2
J1708Checksum = 0;
rx_busy = false;
ERR2_RxOverflow = false;
MIDByteCount[ERR2_MID_Hold] += J1708FrameLength;
ERR2_MID_Hold = -1;
return 0;
}
if (J1708ChecksumOK) {
ERR1_Checksum = false;
ERR2_RxOverflow = false;
rx_busy = false;
RX_Counter++;
MIDByteCount[J1708RxBuffer[1]] += J1708FrameLength;
ERR2_MID_Hold = -1;
return J1708FrameLength;
}
else {
ERR1_Checksum = true;
ERR1_Counter++;
ERR_Counter++;
RX_Counter++;
J1708Checksum = 0;
rx_busy = false;
if (ShowErrors){
Serial.print("ERR1 "); //debug
Serial.print("[");Serial.print(ERR_Counter);Serial.println("] ");
}
MIDByteCount[J1708RxBuffer[1]] += J1708FrameLength;
ERR2_MID_Hold = -1;
return 0; //data would not be valid, so pretend it didn't come
}
}
else {
return 0; //A message isn't ready yet.
}
}
void J1708::J1708AppendChecksum(uint8_t J1708TxData[],const uint8_t &TxFrameLength){
uint8_t chk = 0;
for (int i=0; i<(TxFrameLength-1);i++){
chk+=J1708TxData[i];
}
chk=((~chk<<24)>>24)+1;
J1708TxData[TxFrameLength-1] = chk;
}
bool J1708::J1708Tx(uint8_t J1708TxData[], const uint8_t &TxFrameLength, const uint8_t &TxFramePriority, bool AutoChecksum){
//Max bytes in a J1708 frame is 21.
tx_busy = true;
//Append checksum
if (AutoChecksum){
J1708AppendChecksum(J1708TxData,TxFrameLength);
}
uint8_t mid = J1708TxData[0];
J1708Timer=0;
J1708TxTimer = 0;
//Send the MID
_streamRef->write(mid);
while (!_streamRef->available() && J1708TxTimer < twelvebit){
}
//Check for collision
if (_streamRef->available()){
if (_streamRef->peek()==mid){
// Great, no collision. send the rest of the data
for (int i=1; i<TxFrameLength;i++){
_streamRef->write(J1708TxData[i]);
}
J1708Timer=0;
J1708TxTimer = 0;
if (TxLEDOn){
if (TxLEDState){
TxLEDState = false;
digitalWrite(TxLED,TxLEDState);
}
else{
TxLEDState = true;
digitalWrite(TxLED,TxLEDState);
}
}
tx_busy = false;
ERR4_Collision = false;
TX_Counter++;
tx_transmitting=true;
return 1;
}
else{
//There was a collision.
//Collision handling routine
ERR4_Collision = true;
ERR4_Counter++;
ERR_Counter++;
if (ShowErrors){
Serial.print("ERR4:"); //debug
Serial.print("[");Serial.print(ERR_Counter);Serial.println("] "); //debug
}
}
}
else{
//Did not send MID or it was not captured
ERR5_DataNotSent = true;
ERR_Counter++;
ERR5_Counter++;
if (ShowErrors){
Serial.print("ERR5:");
Serial.print("[");Serial.print(ERR_Counter);Serial.println("] ");
}
}
J1708Timer=0;
J1708TxTimer = 0;
TX_Counter++;
tx_busy = false;
return 0;
}
bool J1708::J1708Send(uint8_t J1708TxData[], const int &TxFrameLength, const int &TxFramePriority){
if (N_TxQ_Total < TxQmax){
if (TxQueuePenalty > 0){
TxQueuePenalty--;
}
if (N_TxS==TxQmax-1){
memcpy(J1708TxQ[N_TxS], J1708TxData, TxFrameLength);
J1708TxQLengths[N_TxS] = TxFrameLength;
J1708TxQPriorities[N_TxS] = TxFramePriority;
N_TxQ_Total++;
N_TxS=0;
ERR3_Tx_Overflow = false;
return 1;
}
else {
memcpy(J1708TxQ[N_TxS], J1708TxData, TxFrameLength);
J1708TxQLengths[N_TxS] = TxFrameLength;
J1708TxQPriorities[N_TxS] = TxFramePriority;
N_TxQ_Total++;
N_TxS++;
ERR3_Tx_Overflow = false;
return 1;
}
}
else {
ERR3_Tx_Overflow = true;
ERR_Counter++;
ERR3_Counter++;
if (TxQueuePenalty < TxQmaxMaxPenalty){
TxQueuePenalty ++;
}
if (ShowErrors){
Serial.print("ERR3:");
Serial.print("[");Serial.print(ERR_Counter);Serial.println("] ");
}
return 0;
}
}
bool J1708::RTS_Handler(uint8_t TP_Data[]){
//Serial.print("RTS Handler Started [");Serial.print(selfMID);Serial.println("]");
uint8_t D_MID=TP_Data[1];
if (!TP_Rx_Flag && !TP_Tx_Flag){
TP_Rx_NSegments=TP_Data[6];
uint16_t TP_Rx_NBytes = ( (uint16_t)TP_Data[8]<<8 ) | ( (uint16_t)TP_Data[7] );
//Sanity check
if (TP_Rx_NSegments>0 && TP_Rx_NBytes>0){
if (TP_Rx_NBytes<=256){
//Good to go...
uint8_t CTS_message[8] = {selfMID,197,4,D_MID,2,TP_Rx_NSegments,1,0};
J1708Send(CTS_message,8,8);
TP_Rx_Flag = true;
TP_Session_MID = D_MID;
TP_Session_Timer = 0;
return 1;
//Serial.print("RTS Handler Complete [");Serial.print(selfMID);Serial.println("]");
}
else{
//Restricting to 256 for now to save memory; Protocol max is 3825-bytes. Abort the request.
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
TP_Rx_Flag = false;
return 0;
}
}
else{
//Malformed request. Abort.
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
TP_Rx_Flag = false;
return 0;
}
}
else{
//Serial.print("RTS is busy but received request. [");Serial.print(selfMID);Serial.println("]");
//Busy with another connection. Abort the request for now.
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
return 0;
}
}
bool J1708::CTS_Handler(uint8_t TP_Data[]){
//Serial.print("CTS Handler Started [");Serial.print(selfMID);Serial.println("]");
uint8_t D_MID=TP_Data[1];
if (TP_Tx_Flag && D_MID==TP_Session_MID){
uint8_t TP_NSegments=TP_Data[6];
uint8_t TP_StartSegment=TP_Data[7];
uint8_t TP_NBytes=TP_Tx_NBytes;
int N=0;
//Sanity Check - Is request actually logical relative to RTS
if (TP_NSegments <= TP_Tx_NSegments && TP_StartSegment<=TP_Tx_NSegments){
//Good to go
for (int i=TP_StartSegment; i<TP_NSegments+TP_StartSegment; i++){
//Do we have enough data to fill up TP_Default_Segment_Size?
if (TP_NBytes>=TP_Default_Segment_Size){
//Yes...
N = TP_Default_Segment_Size;
Q_Lengths[i-1] = N+5+1;
Q_Matrix[i-1][0]=selfMID;
Q_Matrix[i-1][1]=198;
Q_Matrix[i-1][2]=N+2;
Q_Matrix[i-1][3]=D_MID;
Q_Matrix[i-1][4]=i;
for(int j=0; j<N;j++){
Q_Matrix[i-1][j+5] = TP_Tx_Buffer[j+(N*(i-1))];
TP_NBytes--;
}
}
else{
//No, this is the last segment. It has less than the max TP_Default_Segment_Size amount of data.
N = TP_NBytes;
Q_Lengths[i-1] = N+5+1;
Q_Matrix[i-1][0]=selfMID;
Q_Matrix[i-1][1]=198;
Q_Matrix[i-1][2]=N+2;
Q_Matrix[i-1][3]=D_MID;
Q_Matrix[i-1][4]=i;
for (int k=0; k<N; k++){
Q_Matrix[i-1][k+5] = TP_Tx_Buffer[k+(TP_Default_Segment_Size*(i-1))];
TP_NBytes--;
}
}
}
//Serial.print("CTS Handler Complete [");Serial.print(selfMID);Serial.println("]");
Q_flag = true;
return 1;
}
//Bad CTS request. Abort the request and session.
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
TP_Tx_Flag = false;
TP_Tx_NBytes=0;
TP_Tx_NSegments=0;
Q_Counter=0;
Q_flag=false;
return 0;
}
else{
//Serial.print("CTS handler received request but is busy or did not expext CTS. [");Serial.print(selfMID);Serial.println("]");
//Not in an active connection or busy with another connection. Abort the request for now.
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
return 0;
}
}
bool J1708::CDP_Handler(uint8_t TP_Data[]){
// Serial.print("CDP Handler Started [");Serial.print(selfMID);Serial.println("]");
uint8_t D_MID=TP_Data[1];
if (TP_Rx_Flag && TP_Session_MID==D_MID){
uint8_t TP_NBytes=TP_Data[3];
uint8_t TP_SegmentNumber=TP_Data[5];
uint8_t TP_Start=(TP_SegmentNumber-1)*TP_Default_Segment_Size;
//Here is where aditional CTS messages could be sent if malformed
//data is received.
for (int i=0; i<(TP_NBytes-2); i++){
TP_Rx_Buffer[TP_Start+i] = TP_Data[i+6];
}
if (TP_SegmentNumber==TP_Rx_NSegments){
uint8_t EOM_message[6] = {selfMID,197,2,D_MID,3};
J1708Send(EOM_message,6,8);
//Reset all Variables and Flags
TP_Rx_Flag = false;
TP_Rx_NBytes=0;
TP_Rx_NSegments=0;
// Serial.print("CDP Handler Complete [");Serial.print(selfMID);Serial.println("]");
return 1;
}
//Serial.print("CDP Handler is expecting more data Segments. [");Serial.print(selfMID);Serial.println("]");
//Request the next batch of data segments or wait.
return 0;
}
else{
//CDP Received but not in an active session/busy with another one. Abort.
TP_Rx_Flag = false;
TP_Rx_NBytes=0;
TP_Rx_NSegments=0;
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
return 0;
}
}
void J1708::EOM_Handler(uint8_t TP_Data[]){
//Serial.print("EOM Handler Started [");Serial.print(selfMID);Serial.println("]");
uint8_t D_MID=TP_Data[1];
if (TP_Tx_Flag && D_MID==TP_Session_MID){
//Reset all TP_Tx variables and Flags. End Session.
TP_Tx_Flag = false;
TP_Tx_NBytes=0;
TP_Tx_NSegments=0;
Q_Counter=0;
Q_flag=false;
}
else{
//We received an EOM that is not related to our ongoing session.
//Tell them to Abort. (not really necessary)
uint8_t Abort_msg[6] = {selfMID,197,2,D_MID,255,0};
J1708Send(Abort_msg,6,8);
}
//Serial.print("EOM Handler Complete [");Serial.print(selfMID);Serial.println("]");
}
void J1708::Abort_Handler(uint8_t TP_Data[]){
//Serial.print("Abort Handler Started [");Serial.print(selfMID);Serial.println("]");
uint8_t D_MID=TP_Data[1];
if ((TP_Tx_Flag && D_MID==TP_Session_MID) || (TP_Rx_Flag && D_MID==TP_Session_MID)){
//Reset all TP_Tx and TP_Rx variables and flags
TP_Rx_Flag = false;
TP_Rx_NBytes=0;
TP_Rx_NSegments=0;
TP_Tx_Flag = false;
TP_Tx_NBytes=0;
TP_Tx_NSegments=0;
Q_Counter=0;
Q_flag=false;
}
else{
//We received an Abort that is not related to our ongoing session.
//Ignore it.
}
//Serial.print("Abort Handler Complete [");Serial.print(selfMID);Serial.println("]");
}
bool J1708::J1708CheckChecksum(uint8_t J1708Message[],const uint8_t &FrameLength){
uint8_t chk = 0;
for (int i=0; i<(FrameLength-1);i++){
chk+=J1708Message[i];
}
chk=((~chk<<24)>>24)+1;
if (J1708Message[FrameLength]==chk){
return 1;
}
else{
return 0;
}
}
bool J1708::J1708CheckACL(const uint8_t &mid){
if (tx_transmitting){
return false;
}
if (selfACL[mid]){
if (mid==selfMID){
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
ERR_Counter++;
ERR7_Counter++;
ERR7_IDCounter[mid]++;
if (ERR7_IDCounter[selfMID]<=ERR7_Limit){
uint8_t msg[10] = {selfMID,255,255,250,4,1,selfMID,(uint8_t)((ERR7_IDCounter[selfMID]<<8)>>8),(uint8_t)(ERR7_IDCounter[selfMID]>>8),0};
J1708Send(msg,10,8);
}
else if (ERR7_IDCounter[selfMID]==ERR7_Limit+1){
ERR8_Tracker[selfMID] = true;
ERR8_Counter++;
ERR_Counter++;
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
}
if (ERR8_Timer > ERR8_Interval && ERR8_Tracker[selfMID] == true){
uint8_t msg[9] = {selfMID,255,255,250,3,2,selfMID,(uint8_t)ERR8_Counter,0};
J1708Send(msg,9,3);
ERR8_Timer = 0;
}
}
return false;
}
return true;
}
void J1708::UpdateNetworkStatistics(){
if (BusloadTimer>1000){
// Two calculation methods see Thesis Chapter 5:
// 1.) Absolute Max: Assuming buad of 9600 -> max 10bit characters in one second = 960.0
// 2.) Protocol Max: Assuming buad of 9600, J1708 message overhead, 21-byte messages -> max 10bit characters in one second = 903.0
busload = (float)TotalByteCount/903.0;
for (int i=0;i<=255;i++){
MIDShareTracker[i] = (float)MIDByteCount[i]/(float)TotalByteCount;
MIDByteCount[i] = 0;
}
BusloadTimer = 0;
TotalByteCount = 0;
}
}
void J1708::J1708CheckNetwork(){
if (ERR6_Timer > 500){
if (busload>maxBusload){
ERR6_Counter++;
ERR_Counter++;
ERR6_HighBusload = true;
ERR6_ConsecutiveCounter++;
if (ERR6_ConsecutiveCounter>ERR6_ConsecutiveMax){
for (int i=0;i<=255;i++){
if (MIDShareTracker[i]>maxMIDShare){
// Flooding Caught
if (selfHostPort==false){
// ...on the shared network (ERR9)
if (!ERR9_Tracker[i]){
ERR9_Tracker[i]=true;
ERR9_Counter++;
ERR_Counter++;
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
J1708UpdateACL(i,true);
uint8_t msg[8] = {selfMID,255,255,250,2,3,(uint8_t)i,0};
J1708Send(msg,8,1);
// Dual-side alert - Not necessary
// if (J1708Object_Linked && Rx_Forwarding){
// _j1708Ref->J1708Send(msg,8,1);
// }
}
}
else{
// ...on the host network (ERR10)
if (!ERR10_Tracker[i]){
ERR10_Tracker[i]=true;
ERR10_Counter++;
ERR_Counter++;
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
J1708UpdateACL(i,true);
uint8_t msg[8] = {selfMID,255,255,250,2,4,(uint8_t)i,0};
if (J1708Object_Linked && Rx_Forwarding){
_j1708Ref->J1708Send(msg,8,1);
}
// Dual-side alert - Not necessary
// J1708Send(msg,8,1);
}
}
}
}
}
}
else{
ERR6_HighBusload = false;
ERR6_ConsecutiveCounter = 0;
}
ERR6_Timer = 0;
}
if (TP_Rx_Flag || TP_Tx_Flag){
if (TP_Session_Timer > 10000){
//Abort the current session
TP_Rx_Flag = false;
TP_Rx_NBytes=0;
TP_Rx_NSegments=0;
TP_Tx_Flag = false;
TP_Tx_NBytes=0;
TP_Tx_NSegments=0;
Q_Counter=0;
Q_flag=false;
uint8_t Abort_msg[6] = {selfMID,197,2,TP_Session_MID,255,0};
J1708Send(Abort_msg,6,8);
}
}
if (SECLEDOn){
if (ERR8_Counter>0||ERR9_Counter>0||ERR10_Counter>0){
if (SEC_ERR_Timer>1000){
if (SEC_ERR_LEDState){
digitalWrite(SEC_ERR_LED,HIGH);
SEC_ERR_LEDState = false;
}
else{
digitalWrite(SEC_ERR_LED,LOW);
SEC_ERR_LEDState = true;
}
SEC_ERR_Timer = 0;
}
}
else if (SEC_ERR_Counter>0){
if (SEC_ERR_Timer>500){
if (SEC_ERR_LEDState){
digitalWrite(SEC_ERR_LED,LOW);
SEC_ERR_LEDState = false;
}
}
}
}
}
void J1708::J1708ResetACL(bool mode){
//Reset ACL
for (int i=0; i<256;i++){
selfACL[i]=mode;
}
}
void J1708::J1708UpdateACL(const uint8_t &mid, bool set){
selfACL[mid] = set;
}
int J1708::J1708Parse(){
if (!Loop_flag){
//Save the current message in the RxBuffer to a more stable 32 byte location.
//This also frees the J1708RxBuffer to be used in loop() after J1708Parse() is called.
//uint8_t Loopbuffer[32]={};
memcpy(Loopbuffer, J1708RxBuffer, 21);
//Security Message Handling
//Performed as early as possible compared to normal handling
if (Loopbuffer[2]==255 && Loopbuffer[3]==255 && Loopbuffer[4]==250){
uint8_t security_check = Loopbuffer[6];
//Spoof Alert
if (security_check==1){
ERR7_IDCounter[Loopbuffer[7]]++;
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
ERR_Counter++;
ERR7_Counter++;
return 0;
}
else if (security_check==2){
if (!ERR8_Tracker[Loopbuffer[7]]){
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
ERR_Counter++;
ERR8_Counter++;
ERR8_Tracker[Loopbuffer[7]] = true;
}
J1708UpdateACL(Loopbuffer[7],true);
return 0;
}
else if (security_check==3){
if (!ERR9_Tracker[Loopbuffer[7]]){
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
ERR_Counter++;
ERR9_Counter++;
}
J1708UpdateACL(Loopbuffer[7],true);
return 0;
}
else if (security_check==4){
if (!ERR10_Tracker[Loopbuffer[7]]){
SEC_ERR_Counter++;
digitalWrite(SEC_ERR_LED,!SEC_ERR_LEDState);
ERR_Counter++;
ERR10_Counter++;
}
J1708UpdateACL(Loopbuffer[7],true);
return 0;
}
else {
//Received a malformed Security message
//Do nothing...
return 0;
}
}
//Normal Message Pre-Processing
if (GatewaySpecificProcessing){
switch(Loopbuffer[2]){ //PID
case 128:
//Serial.println("PID 128 Received!"); //debug
if (selfMID==Loopbuffer[4]){
//Component-Specific Request Parameter handler
}
return 0;
break;
case 197:
//Serial.println("PID 197 Received!"); //debug
if (Loopbuffer[4]==selfMID){
switch(Loopbuffer[5]){
case 1:
//Serial.println("RTS Received!");//debug
//Run RTS Handler
return 1;
break;
case 2:
//Serial.println("CTS Received!");//debug
//Run CTS Handler
return 2;
break;
case 3:
//Serial.println("EOM Received!");//debug
//Run EOM Handler
return 3;
break;
case 255:
//Serial.println("Abort Received!");//debug
//Run Abort Handler
return 4;
break;
}
}
return 0;
break;
case 198:
//Serial.println("PID 198 Received!"); //debug
if (Loopbuffer[4]==selfMID){
//Serial.println("CDP Received!"); //debug
//CDPHandler
return 5;
break;
}
default:
break;
}
return 0;
}
else{
return 0;
}
return 0;
}
return 0;
}
void J1708::J1708Listen(){
if (J1708Rx(J1708RxBuffer)>0){
if (J1708CheckACL(J1708RxBuffer[1])){
if (J1708Object_Linked){
if (Rx_Forwarding){
_j1708Ref->J1708Send(J1708RxBuffer+1,J1708FrameLength,0);
FWD_Counter++;
}
}
}
if (RxLEDOn){
if (RxLEDState){
RxLEDState = false;
digitalWrite(RxLED,RxLEDState);
}
else{
RxLEDState = true;
digitalWrite(RxLED,RxLEDState);
}
}
if (ShowTime){
Serial.print("(");
Serial.print(SerialTimer);
Serial.print(")");
Serial.print(" ");
}
if (ShowPort){
Serial.print("SP");
Serial.print(selfPN);
Serial.print(" ");
}
if (ShowLength){
Serial.print("[");
Serial.print(J1708FrameLength);
Serial.print("]");
Serial.print(" ");
}
for (int i = 1; i < J1708FrameLength; i++){ //start at 1 to exclude 0x00 start value
J1708Checksum += J1708RxBuffer[i];
if (ShowRxData){
sprintf(hexDisp,"%02X ",J1708RxBuffer[i]);
Serial.print(hexDisp);
}
}
if (ShowChecksum){
uint8_t chk = 0;
for (int i=1; i<(J1708FrameLength);i++){
chk+=J1708RxBuffer[i];
}
chk=((~chk<<24)>>24)+1;
Serial.print("C:");
Serial.print(chk);
Serial.print(" ");
}
if (ShowBusload){
Serial.print("[");Serial.print(busload);Serial.print("] ");
}
if (ShowMIDShare){
Serial.print("[");Serial.print(MIDShareTracker[J1708RxBuffer[1]]);Serial.print("] ");
}
if (!ShowTime && !ShowPort && !ShowLength && !ShowRxData && !ShowChecksum && !ShowBusload && !ShowMIDShare){
//Nothing will be printed because all flags set false
}
else{
Serial.println();
}
if(!tx_transmitting){
if (J1708LoopTimer>P){
if (fx!=0){
switch(fx){
case 1:
RTS_Handler(Loopbuffer);
break;
case 2:
CTS_Handler(Loopbuffer);
break;
case 3:
EOM_Handler(Loopbuffer);
break;
case 4:
Abort_Handler(Loopbuffer);
break;
case 5:
CDP_Handler(Loopbuffer);
break;
default:
break;
}
fx=0;
P =C_Rate;
Loop_flag = false;
}
else{
P = N_Rate;
fx = J1708Parse();
if (fx>0){
Loop_flag = true;
}
else{
Loop_flag=false;
}
}
J1708LoopTimer = 0;
}
else {
if (fx>0){
//Wait Until next scheduled send.
}
else{
fx = J1708Parse();
if (fx>0){
Loop_flag = true;
}
else{
Loop_flag=false;
}
}
}
}
else{
tx_transmitting=false;
}
}
else{
//Check if a message is in the middle of being received (ie is the line idle?)
if (!rx_busy){
uint8_t priority = J1708TxQPriorities[N_TxQ];
if (J1708TxTimer > (twelvebit+(onebit*priority*2)) + TxQueuePenalty*PenaltyTime){
// Transport CTS Messages (queue #1)
if (Q_flag){
uint8_t Q_Message[Q_Lengths[Q_Counter]] = {};
for (int i=0;i<Q_Lengths[Q_Counter];i++){
Q_Message[i] = Q_Matrix[Q_Counter][i];
}
J1708Tx(Q_Message,Q_Lengths[Q_Counter],8);
if (Q_Counter+1==TP_Tx_NSegments){
Q_flag=false;
Q_Counter = 0;
}
else{
Q_Counter++;
}
}
// Tx Queue Logic (queue #2)
else if (N_TxQ_Total > 0){
if (N_TxQ==TxQmax-1){
// uint8_t J1708TxBuffer[J1708TxQLengths[N_TxQ]];
// for (int i=0;i<J1708TxQLengths[N_TxQ];i++){
// J1708TxBuffer[i] = J1708TxQ[N_TxQ][i];
// }
//Serial.print("Before: N_TxQ:");Serial.print(N_TxQ);Serial.print(",N_TxQ_Total:");Serial.println(N_TxQ_Total);
J1708Tx(J1708TxQ[N_TxQ],J1708TxQLengths[N_TxQ],J1708TxQPriorities[N_TxQ]);
N_TxQ=0;
N_TxQ_Total--;
//Serial.print("After: N_TxQ:");Serial.print(N_TxQ);Serial.print(",N_TxQ_Total:");Serial.println(N_TxQ_Total);
}
else if (N_TxQ>=0){
// uint8_t J1708TxBuffer[J1708TxQLengths[N_TxQ]];
// for (int i=0;i<J1708TxQLengths[N_TxQ];i++){
// J1708TxBuffer[i] = J1708TxQ[N_TxQ][i];
// }
//Serial.print("Before: N_TxQ:");Serial.print(N_TxQ);Serial.print(",N_TxQ_Total:");Serial.println(N_TxQ_Total);
J1708Tx(J1708TxQ[N_TxQ],J1708TxQLengths[N_TxQ],J1708TxQPriorities[N_TxQ]);
N_TxQ++;
N_TxQ_Total--;
//Serial.print("After: N_TxQ:");Serial.print(N_TxQ);Serial.print(",N_TxQ_Total:");Serial.println(N_TxQ_Total);
}
}
}
}
//Is there a relevant message in the loopbuffer that needs to be handled?
if (fx!=0){
switch(fx){
case 1:
RTS_Handler(Loopbuffer);
break;
case 2:
CTS_Handler(Loopbuffer);
break;
case 3:
EOM_Handler(Loopbuffer);
break;
case 4:
Abort_Handler(Loopbuffer);
break;
case 5:
CDP_Handler(Loopbuffer);
break;
default:
break;
}
fx=0;
P =C_Rate;
Loop_flag = false;
}
}
//Periodic Tasks
UpdateNetworkStatistics();
J1708CheckNetwork();