CAN communication write() function

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1

Hi all,

I am trying to send data from CAN0 to CAN1 in NVIDIA Jetson TX2. I have followed the following steps:

  1. sudo modprobe can
  2. sudo modprobe can_raw
  3. sudo modprobe can_dev
  4. sudo modprobe mttcan
  5. ifconfig

This shows CAN0 and CAN1 interfaces are up. Data is transferred successfully by terminal using command
cansend can0 123#abcdabcd. Now, I have written a small program .c program for same as follows:

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<string.h>

void main()
{ char buf[20];
size_t nbytes;
ssize_t bytes_written;
int fd;

strcpy(buf, “This is a test\n”);
nbytes = strlen(buf);

bytes_written = write(fd, buf, nbytes);

printf(“%d”,bytes_written);
}

OUTPUT : -1

I don’t want the write function to return -1. what could go wrong?

2

This post really belongs on one of the programming boards, but we’d recommend creating the file descriptor and setting ‘fd’ with this value before attempting to use it in write()