os_cpu.h

ucos在DSP40上的移植,可以用,在ucos网站上下的!

/*
*********************************************************************************************************
*                                               uC/OS-II
*                                        The Real-Time Kernel
*
*                        (c) Copyright 1992-1998, Jean J. Labrosse, Plantation, FL
*                                          All Rights Reserved
*
*                                  Texas Instruments TMS320C40 Specific Code
*                                          SMALL MEMORY MODEL
*
* File : OS_CPU.H
* By   : Jean J. Labrosse
* Modified by: Ran Cabell
*********************************************************************************************************
*/

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

/*
*********************************************************************************************************
*                                              DATA TYPES
*                                         (Compiler Specific)
* NOTE: On TMS320C40 sizeof(char) == sizeof(int) == sizeof(long) == 32 bits,
*       so C40 bytes and words are equivalent (32 bits).
*       As a result, the following type distinctions have little significance on the C40.
*********************************************************************************************************
*/

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                    */

typedef unsigned int   OS_STK;                   /* Each stack entry is 32-bits wide                   */

#define BYTE           INT8S                     /* Define data types for backward compatibility ...   */
#define UBYTE          INT8U                     /* ... to uC/OS V1.xx.  Not actually needed for ...   */
#define WORD           INT16S                    /* ... uC/OS-II.                                      */
#define UWORD          INT16U
#define LONG           INT32S
#define ULONG          INT32U

/* 
*********************************************************************************************************
*                        Texas Instruments TMS320C40 Small Memory Model
*
* 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.
*             If this method is used, the first line in OSIntCtxSw must read "SUBI 3, SP"
*
* 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. 
*             If this method is used, the first line in OSIntCtxSw must read "SUBI 4, SP"
*********************************************************************************************************
*/
#define  OS_CRITICAL_METHOD    2

#if      OS_CRITICAL_METHOD == 1
#define  OS_ENTER_CRITICAL()  asm("  ANDN  2000H, ST ; Disable GIE") /* Disable interrupts             */
#define  OS_EXIT_CRITICAL()   asm("  OR    2000H, ST ; Enable GIE")  /* Enable  interrupts             */
#endif

#if      OS_CRITICAL_METHOD == 2
#define  OS_ENTER_CRITICAL()  asm("  PUSH  ST"); \
                              asm("  ANDN  2000H, ST");
#define  OS_EXIT_CRITICAL()   asm("  POP   ST") 

#endif

/*
*********************************************************************************************************
*                           C40 Miscellaneous
*********************************************************************************************************
*/

#define  OS_STK_GROWTH        0                       /* Stack grows from LOW to HIGH memory on TIC40  */

#define  uCOS                 0x07                    /* Interrupt vector # used for context switch    */

#define  OS_TASK_SW()         asm("  TRAP 7H         ; Context switch")

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