CAN interfacing with Arduino MP2515 BMS

[ajmmj]

Hi all,
I am very new to posting messages on forums. I have a battery pack - B024N059HD02 which can communicated via CANBus. I can successfully read data using a PCAN tool. According to the datasheet if you send 0x201 with no data written should return Frame 1 - consisting of Byte 0-1 with Pack Voltage, Byte 2-3 with Charge current etc. I am getting these data on PCAN as it can be seen in image below (ignore the rows which arent highlighted).

I have tried various examples and different techniques to read data. The examples I have seen are CAN communication between two Arduinos. Here I am trying to read/write to a device in CAN bus.

1. I tried continously calling 0x201 every 10ms - using PCAN (see image) and tried Arduino's "read" examples from different libraries.

2. I have tried writing 0x201 using "Write" example from different libraries.

3. Tried "Read" and "Write" example combined.

4. Tried a different node id which requires to write 0x02 byte on 0x00E (see image).

5. All the above - One of the errors from various examples

*CAN Read - Testing receival of CAN Bus message

• Can't init CAN
  This indicates it does not get inside the void loop(). I have not enabled any filters either.

bitrate -250kbit/s, 8Mhz clock

Connection between Arduino Uno and MCP2515 as follows;

MCP2515 - Arduino

• SCK - Pin 13
• SI - 12
• SO - 11
• CS - 10
• GND - GND
• VCC - 5V

Any help will be much appreciated

One of the read and write examples I tried on 0x201. Some other example had the ability to alter clock speed to 8Mhz. I have tried all that but nothing has worked.

/****************************************************************************
CAN Write Demo for the SparkFun CAN Bus Shield. 

Written by Stephen McCoy. 
Original tutorial available here: http://www.instructables.com/id/CAN-Bus-Sniffing-and-Broadcasting-with-Arduino
Used with permission 2016. License CC By SA. 

Distributed as-is; no warranty is given.
*************************************************************************/

#include <Canbus.h>
#include <defaults.h>
#include <global.h>
#include <mcp2515.h>
#include <mcp2515_defs.h>

//********************************Setup Loop*********************************//

void setup() {
  Serial.begin(115200);
  Serial.println("CAN Write - Testing transmission of CAN Bus messages");
  delay(1000);
  
  if(Canbus.init(CANSPEED_250))  //Initialise MCP2515 CAN controller at the specified speed
    Serial.println("CAN Init ok");
  else
    Serial.println("Can't init CAN");


  delay(2000);
  
  tCAN message;
  
        message.id = 0x201; //formatted in HEX
        message.header.rtr = 0;
        message.header.length = 8; //formatted in DEC
        message.data[0] = 0x00;
  message.data[1] = 0x00;
  message.data[2] = 0x00;
  message.data[3] = 0x00; //formatted in HEX
  message.data[4] = 0x00;
  message.data[5] = 0x00;
  message.data[6] = 0x00;
  message.data[7] = 0x00;

mcp2515_bit_modify(CANCTRL, (1<<REQOP2)|(1<<REQOP1)|(1<<REQOP0), 0);
mcp2515_send_message(&message);
    
  delay(1000);

 
}

//********************************Main Loop*********************************//

void loop(){

 
if (mcp2515_check_message()) 
  {
    Serial.println("In the loop - if ");
    if (mcp2515_get_message(&message)) 
  {
        Serial.println("In the loop - Second if ");
        if(message.id == 0x00D and message.data[2] == 0xFF)  //uncomment when you want to filter
             {
               
               Serial.print("ID: ");
               Serial.print(message.id,HEX);
               Serial.print(", ");
               Serial.print("Data: ");
               Serial.print(message.header.length,DEC);
               for(int i=0;i<message.header.length;i++) 
                { 
                  Serial.print(message.data[i],HEX);
                  Serial.print(" ");
                }
               delay(2000); 
               Serial.println("");
             }
           }}

}