CAN_DEVCTL_WRITE_CANMSG_EXT

Arguments to devctl():

Description:

This command writes an extended CAN message with an arbitrary message ID.

Input:

A filled-in can_msg structure, which is defined in <sys/can_dcmd.h> as follows:

#define CAN_MSG_DATA_MAX  0x8 /* Max number of data bytes in a CAN message
                                 as defined by CAN spec */

/* Extended CAN Message */
typedef struct can_msg_ext {
    uint32_t        timestamp;         /* CAN message timestamp */
    uint32_t        is_extended_mid;   /* 1=29-bit MID, 0=11-bit MID */
    uint32_t        is_remote_frame;   /* 1=remote frame request, 0=data frame */
} CAN_MSG_EXT;

/* CAN Message */
typedef struct can_msg {
        /* Pre-allocate CAN messages to the max data size */
        uint8_t        dat[CAN_MSG_DATA_MAX];  /* CAN message data */
        uint8_t        len;                    /* Actual CAN message data length */
        uint32_t       mid;                    /* CAN message identifier */
        CAN_MSG_EXT    ext;                    /* Extended CAN message info */
} CAN_MSG;

Output:

None.

Errors:

The devctl() function can return the following, in addition to the error codes listed in its entry in the C Library Reference:

EAGAIN

The transmit queue is currently full.

EINVAL

The file descriptor doesn't correspond to a transmit mailbox.

See also:

CAN_DEVCTL_READ_CANMSG_EXT, CAN_DEVCTL_RX_FRAME_RAW_BLOCK, CAN_DEVCTL_RX_FRAME_RAW_NOBLOCK, CAN_DEVCTL_TX_FRAME_RAW

devctl() in the QNX OS C Library Reference

canctl in the Utilities Reference