PROCESSOR-SDK-AM437X: How to configure CAN using "ip" command

Hi,

Could you please tell me more about the board and TI SDK that you are using?

Best Regards,

Schuyler

Hi,

Thank you for your response. I am using ti-processor-sdk-linux-am437x-evm-06.00.00.07. This is running on custom hardware similar to the AM437x IDK. 

Some more information:

1. On the custom hardware 'ifconfig -a' shows the can interface.
2. "lsmod" shows:

   1. c_can_platform 16384 0
      c_can          20480 1 c_can_platform
      can_dev        24576 1 c_can

3. When executing the following code, I can create and bind to a socket using "can0" successfully. The write fails. I am guessing this is because I haven't configured the CAN interface?

	//Create an empty socket API with
	//PF_CAN as the protocol family
	int s;

	cout << "Creating the socket: " << endl;
	if ((s = socket(PF_CAN, SOCK_RAW, CAN_RAW)) < 0)
	{
		result = SOCKET_ERROR;
		return result;
	}
	cout << "Done.     Socket fd: " << s << endl << endl;

	//----------------------------------------
	//----------------------------------------
	//Bind the socket to one of the interfaces
	struct sockaddr_can addr;
	struct ifreq ifr;
	strcpy(ifr.ifr_name, (const char*)"can0");

	ioctl(s, SIOCGIFINDEX, &ifr);

	//memset(&addr, 0, sizeof(addr));
	addr.can_family = AF_CAN;
	addr.can_ifindex = ifr.ifr_ifindex;

	cout << "Binding to addr: " << endl;
	if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
	{
		return SOCKET_ERROR;
	}
	cout << "Done" << endl << endl;

	//----------------------------------------
	//----------------------------------------
	//Writing CAN frames: To send a frame with the
	//ID 0x101 and a two byte payload of 0x41, 0x42

	struct can_frame frame;
	frame.can_id  = 0x555;
	frame.can_dlc = 2;
	frame.data[0] = 0x41;
	frame.data[1] = 0x42;

	cout << "Writing 2 bytes to the socket: " << endl;
	int nBytes = write(s, &frame, sizeof(struct can_frame));

	cout << "wrote " << nBytes << " bytes." << endl;
	if (nBytes != sizeof(struct can_frame))
	{
		cout << "Failed" << endl;
		return DATA_TRANSFER_ERROR;
	}

Regards,

Peiman

Hi,

Have you seen this chapter in the SDK documentation? It has the steps necessary to initialize the driver.  In the TI filesystem there are some basic send/receive utilities (cansend/candump) that can be used to test the interface. 

Best Regards,

Schuyler