/*
*********************************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*
*                          (c) Copyright 1992-2003, Jean J. Labrosse, Weston, FL
*                                           All Rights Reserved
*                                      MC9S12DP256 Specific code
*                                       (MetroWerks C/C++ V4.2)
*
* File         : OS_CPU.H
* By   : Jean J. Labrosse
* Ported to MC9S12DP256 by Abderrahmane Assal
*********************************************************************************************************
*/
#ifndef  OS_CPU_H
#define  OS_CPU_H
/*
*********************************************************************************************************
                                         CONFIGURATION CONSTANTS
*********************************************************************************************************
*/
#define  OS_TICK_METHOD                 1
#define OS_TICK_OC      7         /* We will use Output Compare #7 to generate tick interrupts */
#define  CPU_FRT_FREQ         500000L       /* Free Running Timer rate (Hz)                            */
                                         /* Number of FRT counts to produce an interrupt @tick rate */
#define  OS_TICK_OC_CNTS  (CPU_FRT_FREQ / OS_TICKS_PER_SEC)  /* OS_TICK_OC_CNTS = CPU_FRT_FREQ / OS_TICKS_PER_SEC*/

/*********************************************************************************************************
;                                           I/O PORT ADDRESSES
********************************************************************************************************/

/*
*********************************************************************************************************
*                                              DATA TYPES
*********************************************************************************************************
*/

typedef unsigned char  BOOLEAN;
typedef unsigned char  INT8U;                    /* Unsigned  8 bit quantity                           */
typedef signed   char  INT8S;                    /* Signed    8 bit quantity                           */
typedef unsigned int   INT16U;                   /* Unsigned 16 bit quantity                           */
typedef signed   int   INT16S;                   /* Signed   16 bit quantity                           */
typedef unsigned long  INT32U;                   /* Unsigned 32 bit quantity                           */
typedef signed   long  INT32S;                   /* Signed   32 bit quantity                           */
typedef float          FP32;                     /* Single precision floating point                    */
typedef double         FP64;                     /* Double precision floating point                    */


#define BYTE           INT8S                     /* Define data types for backward compatibility ...   */
typedef char			SBYTE;
#define UBYTE          INT8U                     /* ... to uC/OS V1.xx                                 */
#define WORD           INT16S
#define UWORD          INT16U
#define LONG           INT32S
#define ULONG          INT32U

typedef unsigned char  OS_STK;                   /* Each stack entry is 8-bit wide                     */
typedef unsigned char  OS_CPU_SR;                /* Define size of CPU status register (PSW = 16 bits) */
/*
*********************************************************************************************************
*                                              CONSTANTS
*********************************************************************************************************
*/

#ifndef  FALSE
#define  FALSE    0
#endif

#ifndef  TRUE
#define  TRUE     1
#endif

/* 
*********************************************************************************************************
*                                           Motorola 68HC12
*
* Method #1:  Disable/Enable interrupts using simple instructions.  After critical section, interrupts
*             will be enabled even if they were disabled before entering the critical section.
*
* Method #2:  Disable/Enable interrupts by preserving the state of interrupts.  In other words, if 
*             interrupts were disabled before entering the critical section, they will be disabled when
*             leaving the critical section.
*
* Method #3:  Disable/Enable interrupts by preserving the state of interrupts.  Generally speaking you
*             would store the state of the interrupt disable flag in the local variable 'cpu_sr' and then
*             disable interrupts.  'cpu_sr' is allocated in all of uC/OS-II's functions that need to 
*             disable interrupts.  You would restore the interrupt disable state by copying back 'cpu_sr'
*             into the CPU's status register.
*
* NOTE(s)  :  1) The current version of the compiler does NOT allow method #2 to be used without changing
*                the processor independent portion of uC/OS-II.
*             2) The current version of the compiler does NOT allow method #3 either.  However, this can
*                be implemented in OS_CPU_A.S by defining the functions: OSCPUSaveSR() and 
*                OSCPURestoreSR().
*********************************************************************************************************
*/
#define  OS_CRITICAL_METHOD    3

#if      OS_CRITICAL_METHOD == 1
#define  OS_ENTER_CRITICAL() __asm sei   ;
#define  OS_EXIT_CRITICAL()  __asm cli   ; 
#endif

#if      OS_CRITICAL_METHOD == 2 
#define  OS_ENTER_CRITICAL() __asm  pshc;  sei;
#define  OS_EXIT_CRITICAL()   __asm  pulc;
#endif

#if      OS_CRITICAL_METHOD == 3 
#define  OS_ENTER_CRITICAL()  (OSCPUSaveSR(cpu_sr))    /* Disable interrupts                        */
#define  OS_EXIT_CRITICAL()   (OSCPURestoreSR(cpu_sr))    /* Enable  interrupts                        */
#endif

#define  OS_TASK_SW() __asm swi;

#define  OS_STK_GROWTH        1                  /* Define stack growth: 1 = Down, 0 = Up  */
#define  CPU_INT_DIS()        __asm sei  ;   /* Disable interrupts    */
#define  CPU_INT_EN()         __asm cli  ;   /* Enable  interrupts            */

/* 
*********************************************************************************************************
*                                             PROTOTYPES
*********************************************************************************************************
*/
#if      OS_CRITICAL_METHOD == 3

void OSCPUSaveSR(OS_CPU_SR os_cpu_sr);                    /* Set 'os_cpu_sr' register to CCR */
                                                 /* ... disable interrupts via SEI instruction.        */
void OSCPURestoreSR(OS_CPU_SR os_cpu_sr);  /* Set CCR register to 'os_cpu_sr'                    */
#endif

#endif