CAN_DEVCTL_SET

Set the message ID

Synopsis:

#include <sys/can_dcmd.h>

#define CAN_DEVCTL_SET_MID   __DIOT(_DCMD_MISC, CAN_CMD_CODE + 1, uint32_t)

Arguments to devctl():

Argument	Value
`filedes`	A file descriptor that you obtained by opening the device. This must be for a transmit or receive mailbox (e.g., /dev/can1/rx2).
`dcmd`	CAN_DEVCTL_SET_MID
`dev_data_ptr`	A pointer to a uint32_t
`n_bytes`	`sizeof(uint32_t)`
`dev_info_ptr`	NULL

Description:

This command sets the message ID for the mailbox associated with the file descriptor.

Input:

The message ID. The form depends on whether or not the driver is using extended MIDs:

In standard 11-bit MIDs, bits 18–28 define the MID.
In extended 29-bit MIDs, bits 0–28 define the MID.

Output:

None.

Example:

int      ret;
uint32_t val;

if( (fd = open( "/dev/can1/rx2", O_RDWR)) == -1 )
{
    printf("open of %s failed \n", devname);
    exit(EXIT_FAILURE);
}

/* Set the new message ID. */
val = strtoul(optarg, NULL, 16);

if(EOK != (ret = devctl(fd, CAN_DEVCTL_SET_MID, &val, sizeof(val), NULL)))
{
    fprintf(stderr, "devctl CAN_DEVCTL_SET_MID: %s\n", strerror(ret));
}

CAN_DEVCTL_SET_MID

Synopsis:

Arguments to devctl():

Description:

Input:

Output:

Example:

See also: