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Thread: IFCT - Improved Flexcan Teensy Library

  1. #126
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    wow.
    Thank you very much for your rapid response.

  2. #127
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    No problem. If you have any issues or features you would like to be added, let me know.

    For others, as a side note for CANquitto, it's updated and transferring payloads over CAN of 1500 bytes successfully

    Here are some tests with CANquitto,

    10 byte actual payload transfer with led toggling on ACK response (write returning 1) : https://www.youtube.com/watch?v=XGUBXl2psck

    1500 byte actual payload transfer with led toggling on ACK response (write returning 1): https://www.youtube.com/watch?v=UP4KQlDcsoc
    Last edited by tonton81; 09-13-2018 at 03:05 PM.

  3. #128
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    The CANquitto library is similar to CAN-FD.

    I hope use CANquitto library.

  4. #129
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    Looks like we're getting better results! Will need to tweak a few more events but CANquitto is now able to transfer 8100 bytes over CANbus Teensy 3.2 <--> Teensy 3.6

    Code:
    PAYLOAD!!: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 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  5. #130
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    Here is a new video update of a Teensy 3.2 talking to a Teensy 3.6 and vice versa. They are sending their own data to each other.

    The 3.2 is sending an array of 1234 bytes, while the 3.6 is sending a char array to the 3.2

    https://www.youtube.com/watch?v=YpxmuLBO8to

  6. #131
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    IFCT Update: now has a separated TX buffer for Can1, so written queued frames would be consumed by the ISR at their respective buffers, especially when sequential writes are used.

  7. #132
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    awesome thing. 1.5 lines of code and weekly torment with flexcan ended. this is my punishment for not immediately downloading IFCT.

  8. #133
    Hi guys,
    I'm working on a CAN datalogger that periodically will ask via OBD II the RPM, TPS, and ECT (pids: 0x0C, 0x11 and 0x05) of my motorbike...
    The make the story short I've connected a CAN trasceiver to the Teensy 3.6 Can1 pins and I've tested the IFTC library with that simple code (started from the cimple IFTC example code):
    #include <IFCT.h>

    void setup() {
    // pinMode(2, OUTPUT); // for the transceiver enable pin
    Can1.setBaudRate(500000);
    Can1.enableFIFO();
    }

    void loop() {
    CAN_message_t msg;
    if ( Can1.read(msg) ) canSniff(msg);
    msg.flags.extended = 0; //random(0,2);
    msg.flags.remote = 0;
    msg.len = 8;
    msg.id = 0x76; //random(0x69, 0x178);
    msg.buf[0] = 0x1; //random(0, 255);
    msg.buf[1] = 0x2; //random(0, 255);
    msg.buf[2] = 0x3; random(0, 255);
    msg.buf[3] = 0x4; //random(0, 255);
    msg.buf[4] = 0x5; //random(0, 255);
    msg.buf[5] = random(0, 255);
    msg.buf[6] = random(0, 255);
    msg.buf[7] = random(0, 255);
    Can1.write(msg);
    }

    void canSniff(const CAN_message_t &msg) {
    Serial.print("MB "); Serial.print(msg.mb);
    Serial.print(" LEN: "); Serial.print(msg.len);
    Serial.print(" EXT: "); Serial.print(msg.flags.extended);
    Serial.print(" REMOTE: "); Serial.print(msg.rtr);
    Serial.print(" TS: "); Serial.print(msg.timestamp);
    Serial.print(" ID: "); Serial.print(msg.id, HEX);
    Serial.print(" Buffer: ");
    for ( uint8_t i = 0; i < msg.len; i++ ) {
    Serial.print(msg.buf[i], HEX); Serial.print(" ");
    } Serial.println();
    }


    I can read and write messages from my Teensy and an Arduino Nano board with MCP2518..


    Now my question is: what would be the best approch/setup to implement my Datalogger? I saw FIFO, MB interrupt options but I'm not so experto to make a decision.
    To summurize what my Datalogger have to do, it has to acquire as much speed as it can the RPM, ECT and TPS from the bike DLC connector (sending ODB request and getting response) and also read an analog voltage 0-5V comming from a wideband O2 sensor.

    Is the FIFO and write() and read() method ok?
    Can I send 3 ODB request without delay or is it better to add a delay between?
    How much have I to wait after sending the ODB request to call the read()?
    Is there a way to filtering only the message I need?
    Any other suggestion will be appreciate


    Thanks!

  9. #134
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    hi

    I use method with IFCT..
    so I recommand simple code....
    I hope it helps.

    #include <IFCT.h>

    elapsedMillis CAN0_Send_timer;
    void setup()
    {
    pinMode( 2, OUTPUT ); // for the transceiver enable pin
    Can0.setBaudRate( 500000 );
    Can0.enableFIFO( 1 );
    Can0.enableFIFOInterrupt( 1 );

    Can0.setFIFOFilter( REJECT_ALL );
    Can0.setFIFOFilter( MB0, 0x111, STD );//
    Can0.setFIFOFilter( MB1, 0x222, STD );//
    Can0.setFIFOFilter( MB2, 0x333, STD );//
    Can0.setFIFOFilter( MB3, 0x444, STD );//
    Can0.setFIFOFilter( MB4, 0x555, STD );//
    Can0.setFIFOFilter( MB5, 0x666, STD );//
    Can0.enhanceFilter( FIFO );

    Can0.onReceive( canSniff );
    Can0.intervalTimer( 1000U ); //
    }

    void loop()
    {
    // put your main code here, to run repeatedly:
    if( CAN0_Send_timer > 1000 )
    {
    CAN0_Send_timer = 0;
    msg.flags.extended = 0; //random(0,2);
    msg.flags.remote = 0;
    msg.len = 8;
    msg.id = 0x76; //random(0x69, 0x178);
    msg.buf[ 0 ] = 0x1; //random(0, 255);
    msg.buf[ 1 ] = 0x2; //random(0, 255);
    msg.buf[ 2 ] = 0x3; random( 0, 255 );
    msg.buf[ 3 ] = 0x4; //random(0, 255);
    msg.buf[ 4 ] = 0x5; //random(0, 255);
    msg.buf[ 5 ] = random( 0, 255 );
    msg.buf[ 6 ] = random( 0, 255 );
    msg.buf[ 7 ] = random( 0, 255 );
    Can1.write( msg );
    }
    }

    void canSniff( const CAN_message_t &msg )
    { // global callback
    Serial.print( "MB " ); Serial.print( msg.mb );
    Serial.print( " LEN: " ); Serial.print( msg.len );
    Serial.print( " EXT: " ); Serial.print( msg.flags.extended );
    Serial.print( " REMOTE: " ); Serial.print( msg.flags.remote );
    Serial.print( " TS: " ); Serial.print( msg.timestamp );
    Serial.print( " ID: " ); Serial.print( msg.id, HEX );
    Serial.print( " Buffer: " );
    for( uint8_t i = 0; i < msg.len; i++ )
    {
    Serial.print( msg.buf[ i ], HEX ); Serial.print( " " );
    } Serial.println();

    switch( msg.id )
    {
    default:
    break;
    case 111:
    break;
    case 222:
    break;
    case 333:
    break;
    case 444:
    break;
    case 555:
    break;
    case 666:
    break;
    }
    }

  10. #135
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    ecu requests are typically responded with the latency of the ecu processing. Since you are reading CAN, even without ECU requests you still have data in the stream which contain the values youíll most lilely be requesting from the ECU, itís just a matter of looking at the stream and judging which frames contain the values you seek. Usually realtime data can be seen in the stream especially from a body controller CAN network without even talking to the ecu...

  11. #136
    Hey guys, I have just tested on my bike and there is a good and a bad news!
    The good news is that I'm able to read the CAN messages from the diagnostic connector
    The bad news is that if I send periodically an OBD request to get RPM it doesn't work and on my dashboard pops up an error (don't have the diagnostic tool now)!!!
    Here there is the code that send the OBD request:

    CAN_message_t reqMsg;
    reqMsg.flags.extended = 0;
    reqMsg.flags.remote = 0;
    reqMsg.len = 8;
    reqMsg.id = OBD_DIAG_ID;
    reqMsg.buf[0] = 0x02;
    reqMsg.buf[1] = 0x01;
    reqMsg.buf[2] = 0x0C; // RPM
    reqMsg.buf[3] = 0x00;
    reqMsg.buf[4] = 0x00;
    reqMsg.buf[5] = 0x00;
    reqMsg.buf[6] = 0x00;
    reqMsg.buf[7] = 0x00;
    Can1.write(reqMsg);



    Can you help me undestand why?

  12. #137
    With Arduino Nano and MCP2515 CAN module this snippet works fine:

    #define OBD_DIAG_ID 0x7DF

    ...
    uint8_t txDataReq[] = {0x02,0x01,0x0C,0x00,0x00,0x00,0x00,0x00};

    if(CAN0.sendMsgBuf(OBD_DIAG_ID, 8, txDataReq) != CAN_OK) {
    Serial.print(F("Error Sending OBD request: "));
    Serial.println(id);
    CAN0.abortTX();
    }
    ...

  13. #138
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    do you have common ground? and how fast are your requests? sometimes ecus need a period between requests, the dash light will go away on it’s own after awhile, you need to check your connections and baudrate

    code cannot produce this problem with your bike because it’s done in hardware of teensy CAN controller, so valid crc frames are sent, however if you are missing common ground or bad bitrate that can lead to disrupting the canbus lines,

  14. #139
    Thanks for response!
    Yes I have common ground and the speed is 500kbps.
    I'm sending the request every 5 seconds...

    What is not clear to me is that I can read messages so the HW seems ok, isn't it?

  15. #140
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    yes, transceiver enable pin is on?

  16. #141
    I'm using this transceiver :
    https://www.ebay.it/itm/2pcs-SN65HVD...72.m2749.l2649

    Have I to enable some pin?
    I just do this on my setup:

    Can1.setBaudRate(500000);
    Can1.enableFIFO();

  17. #142
    I've just make a test:
    I've connected the Teensy to the bike and I just load the code that dump all received CAN messages... then I've added the OBD request for RPM every 5 sec.
    In attach the code and the dump files, hope someone could help me...
    Attached Files Attached Files

  18. #143
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    what error you getting? same as previous post?

  19. #144
    Yes, the dashboard report an error and it seems that no OBD response is received related to the requests

  20. #145
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    and you have 3.3V and GND attached to transceiver?

    It should work, the hardware wouldn’t send if there was a problem. Can you try Can0?

  21. #146
    Yes 3.3V and GND is connected to transceiver.
    I have to re-cable the board to try with Can0....

  22. #147
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    ok so you can read but not send?

    the only thing i dont understand is the controller wont send it without a valid crc, provided the bitrate was correct, which you can read which sounds fine. It’s possible the transceiver is bad? Another user was able to talk to Can0 and Can1 at same time, do you have another transceiver to test?

    Also if your transceiver has a 60/120 ohm resistor, remove it, if its SMT resister, just break it off, lose that termination..

    look at the SMT resistor labeled “121” above the CANH/CANL, break it with pliers/cuttters.. you dont terminate an already terminated network (bike/vehicle)

  23. #148
    Before trying to the bike Iíve tested the board connected to an Arduino + MCP2515 and I was able to both send and receive messages.... really canít understd

  24. #149
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    did u break the resistor ď121Ē on that chinese board transceiver? you shouldnt use that on the car or bike, take it off the board

  25. #150
    Not yet! Iíll give it a try soon and Iíll let you know, thanks!
    I leave it because Iím the MCP2515 is still there with no issue...

    PS can you point me to a good transceiver not Chinese/clone?

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