configuration problem of MCP2515 CAN bus module with ISO-TP library

Projects Programming
1

Hai Sir,
I found this library and installed it:GitHub - altelch/iso-tp: ISO 15765-2 TP implementation for Arduino.

i need to use iso tp protocol to send data from one node to another.

im getting failure config as output after uploading code ...the output satement as below

Entering Configuration Mode Failure...
Send...
Receive...Buffer: 800 [0] 
Send...
Receive...Buffer: 800 [0] 
Send...
Receive...Buffer: 800 [0] 
Send...
Receive...Buffer: 800 [0] 
Send...
Receive...Buffer: 800 [0] 
Send...
Receive...Buffer: 800 [0] 
Send...
Receive...Buffer: 800 [0] 
Send...

my connections are

-----------------Node1----------------- ------------Node2-------------------

mega 2560 mcp2515 mcp2515 arduinouno
vcc vcc vcc vcc

gnd gnd gnd gnd
pin 53 ------------- cs cs ---------------- pin10
pin 52 sck sck pin13
pin 51 mosi mosi pin11
pin 50 miso miso pin12
CANH -----------------------CANH
CANL -----------------------CANL

i want to send data from Node1 to Node2...
please help me ,how to solve this problem? CAN iso data configuration failed..why i dnt know... :frowning: :frowning: :frowning:

Any possible solution ??

2

sailaja:
Hai Sir,
I found this library and installed it:GitHub - altelch/iso-tp: ISO 15765-2 TP implementation for Arduino.

i need to use iso tp protocol to send data from one node to another.

im getting failure config as output after uploading code ...the output satement as below

Entering Configuration Mode Failure...

Send...
Receive...Buffer: 800 [0]
Send...
Receive...Buffer: 800 [0]
Send...
Receive...Buffer: 800 [0]
Send...
Receive...Buffer: 800 [0]
Send...
Receive...Buffer: 800 [0]
Send...
Receive...Buffer: 800 [0]
Send...
Receive...Buffer: 800 [0]
Send...





my connections are 


-----------------Node1----------------- ------------Node2-------------------

mega 2560 mcp2515 mcp2515 arduinouno
vcc vcc vcc vcc 

gnd gnd gnd gnd 
pin 53 ------------- cs cs ---------------- pin10 
pin 52 sck sck pin13 
pin 51 mosi mosi pin11 
pin 50 miso miso pin12 
CANH -----------------------CANH
CANL -----------------------CANL



i want to send data from Node1 to Node2...
please help me ,how to solve this problem? CAN iso data configuration failed..why i dnt know... :( :( :( 

**Any possible solution** ??

please share the code you used to send/receive data

3

For Node 1 i used CAN_ID=0x7E0
and for Node 2 CAN_ID=0x7E1..
remaining code same for both nodes sir.

#include <mcp_can.h>
#include <mcp_can_dfs.h>
#include <SPI.h>
#include <iso-tp.h>

#define MCP_INT 2
MCP_CAN CAN0(10);
IsoTp isotp(&CAN0,MCP_INT);

struct Message_t TxMsg, RxMsg;
uint8_t sf_test[] = { 0x00, 0x01 };
uint8_t mf_test[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, \
                      0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F };
uint32_t can_id = 0x7E1;

void setup()
{
  Serial.begin(9600);
  pinMode(MCP_INT, INPUT);
  CAN0.begin(MCP_ANY, CAN_500KBPS, MCP_8MHZ);
  CAN0.setMode(MCP_NORMAL);
}

void loop()
{ 
  TxMsg.len=sizeof(mf_test);
  TxMsg.Buffer=(uint8_t *)calloc(MAX_MSGBUF,sizeof(uint8_t));
  TxMsg.tx_id=can_id;
  TxMsg.rx_id=can_id+0x20;
  memcpy(TxMsg.Buffer,sf_test,sizeof(sf_test));
  Serial.println(F("Send..."));
  isotp.send(&TxMsg);
  
  RxMsg.tx_id=can_id;
  RxMsg.rx_id=can_id+0x20;
  RxMsg.Buffer=(uint8_t *)calloc(MAX_MSGBUF,sizeof(uint8_t));
  Serial.print(F("Receive..."));
  isotp.receive(&RxMsg);
//  Serial.println(RxMsg.Buffer);
  isotp.print_buffer(RxMsg.rx_id, RxMsg.Buffer, RxMsg.len);
}
4

sir,im new to this ISO tp concept......please explain,how to approach

5

Hello sir,CAN begin successful..because CS of mega pin is 53..in coding i changed as MCP_CAN CAN0(53);..but communication not happend between Node1 and Node2...communication problem..[i tested node1 node 2 communication without isp-tp..its working normal CAN communication with same connections)

here CAN_ID should keep same for both nodes? or not?

in both ways i tried(kept different CANIDs and Same CANIDs)..but no progress...

please help me :frowning: :frowning: :frowning:

6

please help me anybody.why communication not establishing..theoritically concept is correct...

:frowning: :frowning: :frowning: :frowning: :frowning:

7

sailaja:
please help me anybody.why communication not establishing..theoritically concept is correct...

Ah... if only we just needed theory...try sending something simpler first

Send 7E0 message from Node1 to Node2 and see if it received it (serial print maybe)
Send 7E1 message from Node2 to Node1 and see if it received it (serial print maybe)

use the MCP2515 example to help you

if you know the theory the ISO-TP is just a protocol to package large about of data to transfer between nodes

8

MCP2515 example to help you

MCP2515 example working fine..i can able to send and receive data using mcp_can...
but while coming to ISO-TP

Send 7E0 message from Node1 to Node2 and see if it received it (serial print maybe)

tried sir.but not connecting..means even Node 2 cant able to get even Node 1 CAN_ID

is there anything wrong in my approach?

nothing sending and receiving...plzz help me?