www.pudn.com > ucosii_for_m128_template.rar > os_cpu.h, change:2004-02-05,size:5375b


/* 
********************************************************************************************************* 
*                                               uC/OS-II 
*                                         The Real-Time Kernel 
* 
*                                       ATmega128 Specific code 
* 
* File     : OS_CPU.H 
* By       : Ole Saether 
*            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; 
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 unsigned char  OS_STK;                   /* Each stack entry is 8-bit wide                      */ 
typedef unsigned char  OS_CPU_SR;                /* Define size of CPU status register (PSW = 8 bits)   */ 
 
/*  
********************************************************************************************************* 
*                                             Atmel AVR 
* 
* 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. The IAR compiler does not support inline assembly so I'm 
*             using the _OPC() intrinsic function. Here are the instructions: 
* 
*             OS_ENTER_CRITICAL: 
*                 ST      -Y,R16 
*                 IN      R16,SREG 
*                 CLI 
*                 PUSH    R16 
*                 LD      R16,Y+ 
* 
*             OS_EXIT_CRITICAL: 
*                 ST      -Y,R16 
*                 POP     R16 
*                 OUT     SREG,R16 
*                 LD      R16,Y+ 
* 
* 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    3 
 
 
#if      OS_CRITICAL_METHOD == 3 
#define  OS_ENTER_CRITICAL()  (cpu_sr = OS_CPU_SR_Save()) /* Disable interrupts                        */ 
#define  OS_EXIT_CRITICAL()   (OS_CPU_SR_Restore(cpu_sr)) /* Enable  interrupts                        */ 
#endif 
 
/* 
********************************************************************************************************** 
*                                          AVR Miscellaneous 
********************************************************************************************************** 
*/ 
 
#define  OS_STK_GROWTH      1                       /* Stack grows from HIGH to LOW memory on AVR       */ 
 
#define  OS_TASK_SW()       OSCtxSw() 
 
/* 
********************************************************************************************************** 
*                                          GLOBAL VARIABLES 
********************************************************************************************************** 
*/ 
 
OS_CPU_EXT  INT16U  OSTaskStkSize;                  /* Used to set the total stack size of a task       */ 
OS_CPU_EXT  INT16U  OSTaskHardStkSize;              /* Used to set the hardware stack size of a task    */ 
 
/* 
********************************************************************************************************** 
*                                         Function Prototypes 
********************************************************************************************************** 
*/ 
 
#if OS_CRITICAL_METHOD == 3 
OS_CPU_SR  OS_CPU_SR_Save(void); 
void       OS_CPU_SR_Restore(OS_CPU_SR cpu_sr); 
#endif 
 
void       OSTickISR_Init(void); 
void       OSTickISR_Handler(void);