constants.h

PCM9880是一块PC/104界面的双端口隔离CAN总线通讯卡

/* constants.h
 * Header file for the Linux CAN-bus driver.
 * Written by Arnaud Westenberg email:[e-mail]
 * This software is released under the GPL-License.
 * Version 0.7  6 Aug 2001
 */

#ifdef __CONSTANTS_H__
#else
#define __CONSTANTS_H__

/* Device name as it will appear in /proc/devices */
#define DEVICE_NAME "can"

/* Default driver major number, see /usr/src/linux/Documentation/devices.txt */
#define CAN_MAJOR 91

/* Timeout in jiffies before the system calls return with an error */
#define CANTIMEOUT (4*HZ)

/* Definition of the maximum number of concurrent supported hardware boards,
 * chips per board, total number of chips, interrupts and message objects.
 * Obviously there are no 32 different interrupts, but each chip can have its
 * own interrupt so we have to check for it MAX_IRQ == MAX_TOT_CHIPS times.
 */
#define MAX_HW_CARDS 8
#define MAX_HW_CHIPS 4
#define MAX_TOT_CHIPS (MAX_HW_CHIPS*MAX_HW_CARDS)
#define MAX_IRQ 32
#define MAX_MSGOBJS 15
#define MAX_TOT_MSGOBJS (MAX_TOT_CHIPS*MAX_MSGOBJS)
#define MAX_BUF_LENGTH 64

#define IE (1<<1)
#define SIE (1<<2)
#define EIE (1<<3)

#define SPACING 0x3c0

/* These flags can be used for the msgobj_t structure flags data entry */
#define OPENED (1<<0)

/* These flags can be used for the chip_t structure flags data entry */
#define CONFIGURED (1<<0)
#define SEGMENTED (1<<1)

/* These flags can be used for the candevices_t structure flags data entry */
#define PROGRAMMABLE_IRQ (1<<0)

enum timing_BTR1 {
	MAX_TSEG1 = 15,
	MAX_TSEG2 = 7
};

/* Flags for baud_rate function */
#define BTR1_SAM (1<<1)

#endif