led_driver.h

一个简单的小型操作系统

/*****************************************************************************
 * 
 * Module      : led_driver.h
 * Description : low level LED device driver
 * OS          : SLOS 0.09
 * Platform    : e7t
 * History     : 
 *
 * 19th November 2001 Andrew N. Sloss
 * - Example simple Device driver by Chris Wright's 
 *   specification
 *
 *****************************************************************************/

#ifndef _DEVICE_E7T_LED

#define _DEVICE_E7T_LED  1

#define DEVICE_LED_E7T   55075


#define GREEN1      0
#define RED         2
#define ORANGE      1
#define GREEN2      3

#define ON          1
#define OFF         0

/* -- led_init ----------------------------------------------------------------
 *
 * Description : initalize the LED device driver internal 
 *               data structures and hardware. Set all the
 *               LED's to be zero.
 * 
 * Parameters  : none...
 * Return      : none...
 * Notes       : none...
 *
 */

void led_init(void);

/* -- led_open ----------------------------------------------------------------
 *
 * Description : example open on the LED 
 * 
 * Parameters  : unsigned device = 55075 
 *             : unsigned minor = (0=GREEN1,1=RED,2=ORANGE,3=GREEN2)
 * Return      : UID -
 * Notes       : 
 *
 */

UID led_open(unsigned device,unsigned led);

/* -- led_close ---------------------------------------------------------------
 *
 * Description : example open on the LED 
 * 
 * Parameters  : UID id = 55075 
 * Return      : 
 *   DEVICE_SUCCESS - successfully close the device
 *   DEVICE_UNKNOWN - couldn't identify the UID
 * Notes       : 
 *
 */

int led_close(UID id);

/* -- led_write_bit -----------------------------------------------------------
 *
 * Description : write a particular bit to an LED 
 * 
 * Parameters  : UID id = 55075 + unit (0..3)
 *             : BYTE led_set - least significant bit is used
 * Return      : none...
 *
 * Notes       : an example of a led write bit
 *
 */

void led_write_bit(UID id,BYTE led_set);

/* -- led_read_bit ------------------------------------------------------------
 *
 * Description : read a particular bit value 
 * 
 * Parameters  : UID id = 55075 + unit (0..3)
 * Return      : value return error if 255
 *
 * Notes       : an example of a led read bit
 */

BYTE led_read_bit(UID id);

#endif