os_cpu.h

uCOS-II在TMS320F2812上的移植

/*
*********************************************************************************************************
*                                                uC/OS-II
*                                          The Real-Time Kernel
*
*                              (c) Copyright 2002, Micrium, Inc., Weston, FL
*                                           All Rights Reserved
*
*                                               TI TMS320F2812 
*
*
* File         : OS_CPU.H
* By           : Lin Shi Chun([e-mail])
*                Jean J. Labrosse
*********************************************************************************************************
*/

#ifdef  OS_CPU_GLOBALS
#define OS_CPU_EXT
#else
#define OS_CPU_EXT  extern
#endif

/*
*********************************************************************************************************
*                                              DATA TYPES
*                                         (Compiler Specific)
*********************************************************************************************************
*/

typedef unsigned char      BOOLEAN;              /* (16bit)                                            */
typedef unsigned char      INT8U;                /* Unsigned  8 bit quantity(16bit)                    */
typedef signed   char      INT8S;                /* Signed    8 bit quantity(16bit)                    */
typedef unsigned int       INT16U;               /* Unsigned 16 bit quantity(16bit)                    */
typedef signed   int       INT16S;               /* Signed   16 bit quantity(16bit)                    */
typedef unsigned long      INT32U;               /* Unsigned 32 bit quantity(32bit)                    */
typedef signed   long      INT32S;               /* Signed   32 bit quantity(32bit)                    */
typedef unsigned long long INT64U;               /* Unsigned 64 bit quantity(64bit)                    */
typedef signed   long long INT64S;               /* signed   64 bit quantity(64bit)                    */
typedef float              FP32;                 /* Single precision floating point(32bit)             */
typedef long double        FP64;                 /* Double precision floating point(64bit)             */
typedef unsigned int       OS_STK;               /* Each stack entry is 16-bit wide(16BIT)             */
typedef unsigned int       OS_CPU_SR;            /* Define size of CPU status register (SR = 16 bits)  */

/* 
*********************************************************************************************************
*                                             TI TMS320F2812
*
* 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.
*             NOT IMPLEMENTED!
*
* 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.
*********************************************************************************************************
*/
#define  OS_CRITICAL_METHOD    1


#if      OS_CRITICAL_METHOD == 1
#define  OS_ENTER_CRITICAL()  asm("  DINT")               /* Disable interrupts                        */
#define  OS_EXIT_CRITICAL()   asm("  EINT")               /* Enable  interrupts                        */
#endif

#if      OS_CRITICAL_METHOD == 2
#define  OS_ENTER_CRITICAL()                              /* Disable interrupts                        */
#define  OS_EXIT_CRITICAL()                               /* Enable  interrupts                        */
#endif

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

/*
*********************************************************************************************************
*                                             TMS320F2812
*********************************************************************************************************
*/

#define  OS_STK_GROWTH        0                           /* Stack grows from LOW to HIGH memory on TMS320F2812*/

#define  OS_TASK_SW()         asm("  TRAP #20")           /* OSCtxSw(),Task level context switch routine       */

/*
*********************************************************************************************************
*                                         GLOBAL VARIABLES
*********************************************************************************************************
*/

OS_CPU_EXT  OS_STK  *OSISRStkPtr;                         /* Pointer to top-of ISR stack                    */

/*
*********************************************************************************************************
*                                           PROTOTYPES
*********************************************************************************************************
*/

#if      OS_CRITICAL_METHOD == 3
OS_CPU_SR  OSCPUSaveSR(void);
void       OSCPURestoreSR(OS_CPU_SR cpu_sr);
#endif