target.h

MC68HC908GR60A LIN-BUS源码（编译环境：CodeWarriorV3.1）

/* ************************************************************************ *
 *                                                                          *
 *                  Volcano Communications technologies AB                  *
 *                            All rights reserved                           *
 *                                                                          *
 * ************************************************************************ */

/* ************************************************************************ *
 *         File: target.h                                                   *
 *  Description: Target specific definitions/structures for the Hiware      *
 *               HC08ESCI                                                    *
 *               LTP example application                                    *
 *                                                                          *
 * ************************************************************************ */

#ifndef __TARGET_H__
#define __TARGET_H__

#include <lin.h>
#include <MC68HC908GZ60.h>

typedef volatile unsigned char creg_u8;
typedef volatile unsigned short creg_u16;

/* Volcano processing period is 5 ms in this application. Value given in 
 * number of microseconds. The busy_wait routine fails if PERIOD is
 * greater than 32767, i.e. don't use processing periods longer than 32 ms. */

// #define PERIOD              (6144u) /* # wait 5 ms Mon08 Cyclone clock used. Timer Prescaler also changed */
/* # used when Mon08Cyclone clock is used */

#define PERIOD              (5000u)		/* # Wait 5 ms internal clock used */
/* # used when 8MHz clock source is used */

#define HW_DELAY            PERIOD

#define HC908GZ60


#ifdef HC08AZ60
  /* Modulo timer (TIM) module */
  #define TIMERSC   (*(creg_u8 *)0x4bu)  /* TIM Status and control register */
  #define INITTIMER ((l_u8)0x12u)
  #define TIMERCNT  (*(creg_u16 *)0x4cu) /* Counter */

  #define COP (*(volatile l_u8*)0xffff)  /* Watch-dog */
#endif

#ifdef HC908GZ60
  /* Port, Enable LIN tranciever */

/* Modulo timer (TIM) module */
  #define TIMERSC    T1SC                   /* TIM Status and control register */

//  #define INITTIMER  ((l_u8)0x12u)	  /* # used when Mon08Cyclone clock is used */
  #define INITTIMER  ((l_u8)0x11u) 		  /* # used when 8MHz clock source is used */
/* # prescaler value of 4 when Mon08Cyclone clock is used */
/* # prescaler value of 2 when 8Mhz clock source is used */  

  #define TIMERCNTH  T1CNTH /* Counter */
  #define TIMERCNTL  T1CNTL /* Counter */
  #define TIMERMOD   T1MOD

  #define COP COPCTL      /* Watch-dog */

#endif

#define LSB(x)      ((l_u8)x)
#define MSB(x)      ((l_u8)(x>>8))

/* This is a target dependent macro that should enable interrupts. Using
 * v_sys_irq_restore() is just one way of doing it, which works for this 
 * target.                              */
#define ENABLE_INTS()   l_sys_irq_restore((l_irqmask)0)
#define DISABLE_INTS()  l_sys_irq_disable()

/* Reset Watch-dog counter */
#define PET_WATCHDOG()  (COP = (l_u8)0)

/* Interrupt handling, vectab.asm contains the vector table */
#define UART_0_RX_INTERRUPT_HANDLER interrupt 13 void uart_0_rx_handler(void)

/* Function prototypes */
extern void init_environment (void);


/* ************************************************************************
 * Perform initialisation of target. Initialise a free running counter at
 * 1Mhz.
 */
void init_target (void);


/* ************************************************************************
 * Read timer channel A (free running counter at 1Mhz) and return current
 * value.
 */
l_u16 l_get_us_counter (void);


/* ************************************************************************
 * Restores interrupt level to the previous level, as indicated by the in-
 * put previous. On the CPU12 family the interrupt level can only be either
 * "interrupts enabled" or "interrupts disabled".
 */
void l_sys_irq_restore (l_irqmask previous);
                        

/* ************************************************************************
 * Disable interrupts, and return the previous value of the interrupt
 * level.
 */
l_irqmask l_sys_irq_disable(void);

#endif /* __TARGET_H__ */