Arduino Nano v3 with MCP 2515 CAN Interface & OBD2 not working!

Projects Programming
1

Hi every body,

i have a test with Arduino Nano v3 with MCP 2515 CAN Interface & OBD2.
i have to connect Arduino Nano v3 with MCP 2515 CAN and connect MCP 2515 CAN Interface with OBD2 (on my car is Chevrolet Captiva 2008) by H-CAN to Pin 1, L-CAN to Pin4.

MCP2515 module :

1000×1000 150 KB

Wiring Diagram:

and i use library MCP-can-lib-master : https://github.com/coryjfowler/MCP_CAN_lib

My code:

#include <mcp_can.h>
#include <SPI.h>

long unsigned int rxId;
unsigned char len = 0;
unsigned char rxBuf[8];
char msgString[128];                        // Array to store serial string

#define CAN0_INT 2                              // Set INT to pin 2
MCP_CAN CAN0(10);                               // Set CS to pin 10


void setup()
{
 Serial.begin(115200);

 if (CAN0.begin(MCP_ANY, CAN_33K3BPS, MCP_16MHZ) == CAN_OK)
   Serial.println("MCP2515 Initialized Successfully!");
 else {
   while (true) {
     Serial.println("Error Initializing MCP2515...");
     delay(1000);
   }
 }
 CAN0.setMode(MCP_NORMAL);
 pinMode(CAN0_INT, INPUT);
 Serial.println("MCP2515 Library Receive Example...");
}

void loop()
{
 if (!digitalRead(CAN0_INT))                    
 {
   CAN0.readMsgBuf(&rxId, &len, rxBuf);      // Read data: len = data length, buf = data byte(s)

   if ((rxId & 0x80000000) == 0x80000000)
     sprintf(msgString, "Extended ID: 0x%.8lX  DLC: %1d  Data:", (rxId & 0x1FFFFFFF), len);
   else
     sprintf(msgString, "Standard ID: 0x%.3lX       DLC: %1d  Data:", rxId, len);

   Serial.print(msgString);

   if ((rxId & 0x40000000) == 0x40000000) {
     sprintf(msgString, " REMOTE REQUEST FRAME");
     Serial.print(msgString);
   } else {
     for (byte i = 0; i < len; i++) {
       sprintf(msgString, " 0x%.2X", rxBuf[i]);
       Serial.print(msgString);
     }
   }

   Serial.println();
 }


 if(CAN0.checkError() == CAN_CTRLERROR){
   Serial.print("Error register value: ");
   byte tempErr = CAN0.getError() & MCP_EFLG_ERRORMASK; // We are only interested in errors, not warnings.
   Serial.println(tempErr, BIN);
   
   Serial.print("Transmit error counter register value: ");
   tempErr = CAN0.errorCountTX();
   Serial.println(tempErr, DEC);
   
   Serial.print("Receive error counter register value: ");
   tempErr = CAN0.errorCountRX();
   Serial.println(tempErr, DEC);
 }
}

=============
And i have a problem when run, MCP2515 Initialized Successfully, but allways return length = 0 with ID = 0x000.
and with error check, serial return :

Error register value: 1000
Transmit error counter register value:
Receive error counter register value: 128.

=> please help me what's wrong?

2

Push to top!!!:slight_smile:

3

Hello & welcome, well, I'm not too up on CAN or OBD2 so can't advise, try posting your code correctly as in this link, you might get more "hits". :slight_smile:
HowToPostCode

4

edgemoron:
Hello & welcome, well, I'm not too up on CAN or OBD2 so can't advise, try posting your code correctly as in this link, you might get more "hits". :slight_smile:
HowToPostCode

Very thanks, edgemoron! I had changed content. I hope it can get any data from CAN, but nothing. :slight_smile:

5

push to top!!! Please help me!