PCAN_USB_CMD_ARGS
memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS,
memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS,
#define PCAN_USB_CMD_LEN (PCAN_USB_CMD_ARGS + \
buf[PCAN_USB_CMD_ARGS] = 1;
mc->ptr += PCAN_USB_CMD_ARGS;