3.2 to 4.0 teensy nextion display code

matthunter1448 · Apr 15, 2024

hello I used code just like this in the past on the 3.2 now moving to a 4.0 and changing some things for new screen but wont upload and gives me errors, could anyone help fix this? I'm not much a coding person. i think it has something to do with flexcan.h but not sure.

Code:

/*
   Project that displays Megasquirt engine control data over CAN utilizing a Teensy 3.2 and Nextion 3.2 touch screen display.
   Thanks again to defragster on PJRC forums for the different tips and tricks!

   Hardware used is Teensy 3.2 http://www.pjrc.com/store/teensy32.html
   Nextion 3.2" resistive touch display https://www.itead.cc/nextion-nx4024t032.html
   WaveShare SN65HVD230 CAN Board http://www.amazon.com/gp/product/B00KM6XMXO?psc=1&redirect=true&ref_=od_aui_detailpages00
   Megasquirt/Microsquirt hardware from http://www.diyautotune.com/

   Thank you to xrattiracer for the inspiration here https://github.com/merkur2k/MSCan_Gauge/tree/teensy

*/


#include <FlexCAN.h>
#include <kinetis_flexcan.h>

FlexCAN CANbus(500000);
static CAN_message_t rxmsg;

//Megasquirt data vars
byte indicator[7]; // where to store indicator data
float  BATTV, IAC, dwell, idle_tar, AFRtgt, AFR, newBATTV, oldBATTV; //numbers with a decimal po
unsigned int MAP, SPKADV, RPM, TPS, MAT, CLT, injduty, Baro, PW1, nexAFR, nexCLT;

void setup() {


  //Initialize CAN and start Serial and Serial2, Serial2 is for Nextion display
  CANbus.begin();

  //  Serial.begin(115200); //***Uncomment this section to output CAN message IDs to Serial Monitor***
  //    while (!Serial) ;
  //    Serial.println("Hello Megasquirt");
  Serial2.begin(115200);
}


void loop(void) {

  // Gauge display function
  gauge_display();

  //Look for CAN broadcasts
  if ( CANbus.read(rxmsg) ) {
    switch (rxmsg.id) { // ID's 1520+ are Megasquirt CAN broadcast frames. EAch frame represents a data group http://www.msextra.com/doc/pdf/Megasquirt_CAN_Broadcast.pdf
      case 1520: // Group 0
        RPM = (float)(word(rxmsg.buf[6], rxmsg.buf[7]));
        PW1 = (float)(word(rxmsg.buf[2], rxmsg.buf[3]));
        injduty = ((PW1 / 1000 * RPM / 120) / 10);
        break;
      case 1521: // Group 1
        SPKADV = (float)(word(rxmsg.buf[0], rxmsg.buf[1]));
        indicator[0] = rxmsg.buf[3]; // engine
        AFRtgt = (float)(word(0x00, rxmsg.buf[4]));
        break;
      case 1522: // Group 2
        Baro = (float)(word(rxmsg.buf[0], rxmsg.buf[1]));
        MAP = (float)(word(rxmsg.buf[2], rxmsg.buf[3]));
        MAT = (float)(word(rxmsg.buf[4], rxmsg.buf[5]));
        CLT = (float)(word(rxmsg.buf[6], rxmsg.buf[7]));
        nexCLT = (float)(word(rxmsg.buf[6], rxmsg.buf[7]));

        break;
      case 1523: // Group 3
        TPS = (float)(word(rxmsg.buf[0], rxmsg.buf[1]));
        BATTV = (float)(word(rxmsg.buf[2], rxmsg.buf[3]));
        AFR = (float)(word(rxmsg.buf[4], rxmsg.buf[5]));
        nexAFR = (float)(word(rxmsg.buf[4], rxmsg.buf[5]));
        break;
      case 1524: // Group 4
        break;
      case 1526: // Group 6
        IAC = (float)(word(rxmsg.buf[6], rxmsg.buf[7])); //IAC = (IAC * 49) / 125;
      case 1529: // 9
        dwell = (float)(word(rxmsg.buf[4], rxmsg.buf[5]));
        break;
      case 1530: // Group 10
        indicator[1] = rxmsg.buf[0]; // status 1
        indicator[2] = rxmsg.buf[1]; // status 2
        indicator[3] = rxmsg.buf[2]; // status 3
        indicator[6] = rxmsg.buf[6]; // status 6
        indicator[7] = rxmsg.buf[7]; // status 7
        break;
      case 1537: // Group 17

        break;
      case 1548: // Group 28
        idle_tar = (float)(word(rxmsg.buf[0], rxmsg.buf[1]));
        break;
      case 1551: // Group 31
        break;
      case 1574: // Group 54
        indicator[4] = rxmsg.buf[2]; // cel
        break;

    }


  }
}

elapsedMillis DisplayTime; //Establish a timer to prevent unnecessary screen rewrites

void gauge_display() {  //Prints captured data from above to display

  if ( DisplayTime < 150 ) return;
  DisplayTime = 0;

  //Serial.println(rxmsg.id); Any type of data you want to go to Serial Monitor place here


  // Display Spark Advance

  Serial2.print("t3.txt=");
  Serial2.write(0x22);
  Serial2.print(SPKADV / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  // Display Engine MAP

  Serial2.print("t4.txt=");
  Serial2.write(0x22);
  Serial2.print(MAP / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  // Display Engine Air Fuel Ratio

  Serial2.print("j6.val=");
  Serial2.print(nexAFR / 2); //Nextion is weird and will not display floating point data for a progress bar, so I had to massage the output for the progress bar *only*
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("t14.txt=");
  Serial2.write(0x22);
  Serial2.print(AFR / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  // Define WOT AFR Thresholds

  if ((AFR / 10 < 10.5) && (AFR / 10 > 10) && (TPS / 10 > 80))
    gauge_display_AFR_YELLOW();

  if ((AFR / 10 < 10.0) && (TPS / 10 > 80))
    gauge_display_AFR_RED();

  if ((AFR / 10 < 12.5) && (AFR / 10 > 10.5) && (TPS / 10 > 80))
    gauge_display_AFR_BLACK();

  if ((AFR / 10 > 12.5) && (TPS / 10 > 80))
    gauge_display_AFR_RED();




  // Display Injector Duty Cycle

  Serial2.print("j2.val=");
  Serial2.print(injduty);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("t15.txt=");
  Serial2.write(0x22);
  Serial2.print(injduty);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  //  Several functions to alert if duty cycle is above certain thresholds

  if (injduty < 60)
    gauge_display_injduty_black();

  if ((injduty >= 60) && (injduty < 79))

    gauge_display_injduty_yellow();

  if (injduty > 79)

    gauge_display_injduty_RED();


  // Display Throttle Position

  Serial2.print("j3.val=");
  Serial2.print(TPS / 10);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("t16.txt=");
  Serial2.write(0x22);
  Serial2.print(TPS / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  // Battery voltage generally does not change that fast, so this is trying to reduce a bit of overhead by not updating if the data has not changed
  newBATTV = BATTV / 10;
  if ( newBATTV != oldBATTV )
    gauge_display_BATTV();

  Serial2.print("t8.txt=");
  Serial2.write(0x22);
  Serial2.print(MAT / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  // Display Engine RPM

  Serial2.print("t0.txt=");
  Serial2.write(0x22);
  Serial2.print(RPM);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("j5.val=");
  Serial2.print(RPM / 100);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  // Thresholds for warning colors for Engine RPM

  if (RPM < 5000)
    gauge_display_RPM_BLACK();

  if ((RPM > 5000) && (RPM < 6000))
    gauge_display_RPM_YELLOW();

  if ((RPM > 6000))
    gauge_display_RPM_RED();

  // Display Engine Coolant Temperature

  Serial2.print("t17.txt=");
  Serial2.write(0x22);
  Serial2.print(CLT / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("j4.val=");
  Serial2.print(nexCLT / 20);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);
}

// Gauge functions for thresholds

void gauge_display_injduty_black() {

  Serial2.print("j2.pco=BLACK");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("t15.pco=BLACK");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);
}

void gauge_display_injduty_yellow() {

  Serial2.print("j2.pco=YELLOW");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_injduty_RED() {

  Serial2.print("j2.pco=RED");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_BATTV() {

  oldBATTV =
    Serial2.print("t6.txt=");
  Serial2.write(0x22);
  Serial2.print(BATTV / 10);
  Serial2.write(0x22);
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_RPM_BLACK() {


  Serial2.print("t0.pco=BLACK");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("j5.pco=BLACK");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_RPM_YELLOW() {

  Serial2.print("t0.pco=YELLOW");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

  Serial2.print("j5.pco=YELLOW");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_RPM_RED() {

  Serial2.print("t0.pco=RED");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);


  Serial2.print("j5.pco=RED");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_AFR_RED() {


  Serial2.print("j6.pco=RED");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_AFR_YELLOW() {


  Serial2.print("j6.pco=YELLOW");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

void gauge_display_AFR_BLACK() {

  Serial2.print("j6.pco=BLACK");
  Serial2.write(0xff);
  Serial2.write(0xff);
  Serial2.write(0xff);

}

kd5rxt-mark · Apr 15, 2024

I have no way to test these suggestions, but at least the suggested changes below allows compilation without error . . . maybe this will help you to get started:

Change the following in your sketch above:

Code:

#include <FlexCAN.h>
#include <kinetis_flexcan.h>

FlexCAN CANbus(500000);

To the following (updated for Teensy4.x):

Code:

#include <FlexCAN_T4.h>

FlexCAN_T4<CAN1, RX_SIZE_256, TX_SIZE_16> CANbus;

See if that gets you nearer to your intended destination . . .

Mark J Culross
KD5RXT

MichaelMeissner · Apr 15, 2024

Do note that the pins used for the serial ports are different between the Teensy 3.2 and Teensy 4.x. On the Teensy 3.2, Serial2 was on pins 9 (RX2) and 10 (TX2). On the Teensy 4.x, Serial2 is on pins 7 (RX2) and 8 (TX2).

On both Teensies, only Serial1 has the same pins (0,1). On the Teensy 3.2, Serial3 uses the same pins as Serial2 on the Teensy 4.x. The other serial UARTs on the Teensy 4.x (Serial3..Serial7 on the Teensy 4.0 and Serial3..Serial8 on the Teensy 4.1) do not overlap with Serial3 on the Teensy 3.2.

matthunter1448 · Apr 16, 2024

MichaelMeissner said:
Do note that the pins used for the serial ports are different between the Teensy 3.2 and Teensy 4.x. On the Teensy 3.2, Serial2 was on pins 9 (RX2) and 10 (TX2). On the Teensy 4.x, Serial2 is on pins 7 (RX2) and 8 (TX2).

On both Teensies, only Serial1 has the same pins (0,1). On the Teensy 3.2, Serial3 uses the same pins as Serial2 on the Teensy 4.x. The other serial UARTs on the Teensy 4.x (Serial3..Serial7 on the Teensy 4.0 and Serial3..Serial8 on the Teensy 4.1) do not overlap with Serial3 on the Teensy 3.2.

yes i am aware of this Thank you

matthunter1448 · Apr 16, 2024

kd5rxt-mark said:
I have no way to test these suggestions, but at least the suggested changes below allows compilation without error . . . maybe this will help you to get started:

Change the following in your sketch above:

Code:

#include <FlexCAN.h> #include <kinetis_flexcan.h> FlexCAN CANbus(500000);

To the following (updated for Teensy4.x):

Code:

#include <FlexCAN_T4.h> FlexCAN_T4<CAN1, RX_SIZE_256, TX_SIZE_16> CANbus;

See if that gets you nearer to your intended destination . . .

Mark J Culross
KD5RXT

i think this works it now loads for the upload i will check it soon thanks

3.2 to 4.0 teensy nextion display code

matthunter1448

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kd5rxt-mark

Well-known member

MichaelMeissner

Senior Member+

matthunter1448

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matthunter1448

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