OS_CPU.H File Reference

This graph shows which files directly or indirectly include this file:

Go to the source code of this file.

Macros
#define	OS_STK_GROWTH   0
#define	BYTE   INT8S
#define	UBYTE   INT8U
#define	WORD   INT16S
#define	UWORD   INT16U
#define	LONG   INT32S
#define	ULONG   INT32U
#define	LOWORD(l)   ((INT16U)(l))
#define	HIWORD(l)   (INT16U) *( ( (INT16U*) &((INT32U)(w)) ) + 1 )
#define	LOBYTE(w)   ((INT8U)(w))
#define	HIBYTE(w)   (INT8U) *( ( (INT8U*) &((INT16U)(w)) ) + 1 )
#define	OS_CRITICAL_METHOD   3
#define	OS_ENTER_CRITICAL()
#define	OS_EXIT_CRITICAL()   if(cpu_sr) INTCONbits.GIEH = 1
#define	OS_TASK_SW()   OSCtxSw()

Typedefs
typedef unsigned char	BOOLEAN
typedef unsigned char	INT8U
typedef signed char	INT8S
typedef unsigned int	INT16U
typedef signed int	INT16S
typedef unsigned long	INT32U
typedef signed long	INT32S
typedef float	FP32
typedef double	FP64
typedef signed short long	INT24S
typedef unsigned short long	INT24U
typedef INT8U	OS_STK
typedef INT8U	OS_CPU_SR

Functions
void	CPUInterruptHook (void)
	INTERRUPT SERVICE ROUTINE HOOK.
void	OSCtxSw (void)
	Switch the context by calling the function directly, since there are no software interrupts in a PIC18 processor. More...

Detailed Description

Author

Nathan Brown

Macro Definition Documentation

BYTE

#define BYTE   INT8S

Define data types for backward compatibility ...

HIBYTE

#define HIBYTE

(

w

)

(INT8U) *( ( (INT8U*) &((INT16U)(w)) ) + 1 )

HIBYTE

HIWORD

#define HIWORD

(

l

)

(INT16U) *( ( (INT16U*) &((INT32U)(w)) ) + 1 )

HIWORD

LOBYTE

#define LOBYTE

(

w

)

((INT8U)(w))

LOBYTE

LONG

#define LONG   INT32S

Signed 32 bit quantity

LOWORD

#define LOWORD

(

l

)

((INT16U)(l))

LOWORD

OS_CRITICAL_METHOD

#define OS_CRITICAL_METHOD   3

HIWORD

OS_ENTER_CRITICAL

#define OS_ENTER_CRITICAL

(

)

Value:

cpu_sr = 0;                    \
         if(INTCONbits.GIEH){cpu_sr = 1;}\
         INTCONbits.GIEH = 0

OS_STK_GROWTH

#define OS_STK_GROWTH   0

Define stack growth: 1 = Down, 0 = Up

OS_TASK_SW

#define OS_TASK_SW

(

)

OSCtxSw()

OsCtxSw()

UBYTE

#define UBYTE   INT8U

... to uC/OS V1.xx. Not actually needed for ...

ULONG

#define ULONG   INT32U

Unsigned 32 bit quantity

UWORD

#define UWORD   INT16U

Unsigned 16 bit quantity

WORD

#define WORD   INT16S

... uC/OS-II.

Typedef Documentation

BOOLEAN

typedef unsigned char BOOLEAN

Boolean

FP32

typedef float FP32

Single precision floating point

FP64

typedef double FP64

Double precision floating point

INT16S

typedef signed int INT16S

Signed 16 bit quantity

INT16U

typedef unsigned int INT16U

Unsigned 16 bit quantity

INT24S

typedef signed short long INT24S

Signed 24 bit quantity

INT24U

typedef unsigned short long INT24U

Unsigned 24 bit quantity

INT32S

typedef signed long INT32S

Signed 32 bit quantity

INT32U

typedef unsigned long INT32U

Unsigned 32 bit quantity

INT8S

typedef signed char INT8S

Signed 8 bit quantity

INT8U

typedef unsigned char INT8U

Unsigned 8 bit quantity

OS_CPU_SR

typedef INT8U OS_CPU_SR

Size of Processor Status Word (PSW)

OS_STK

typedef INT8U OS_STK

Each stack entry is 8-bit wide

Function Documentation

OSCtxSw()

void OSCtxSw

(

void

)

Switch the context by calling the function directly, since there are no software interrupts in a PIC18 processor.

TASK LEVEL CONTEXT SWITCH
This function is called when a task makes a higher priority task ready-to-run. /*.

TASK CONTEXT SWITCH

Switch the context by calling the function directly, since there are no software interrupts in a PIC18 processor.

TASK LEVEL CONTEXT SWITCH

Description : This function is called when a task makes a higher priority task ready-to-run.

Arguments : none

Note(s) : 1) Upon entry, OSTCBCur points to the OS_TCB of the task to suspend OSTCBHighRdy points to the OS_TCB of the task to resume

2) The stack frame of the task to resume looks as follows:

                                                                       LOW MEMORY
                        -   19      pdata (lower 8 bits)
                        -   18      pdata (upper 8 bits)
                        -   17      XX (pointed to by FSR1, frame pointer)
                        -   16      STATUS  register
                        -   15      BSR     register
                        -   14      W       register
                        -   13      FSR0L   register
                        -   12      FSR0H   register
                        -   11      FSR2L   register (frame pointer, low)
                        -   10      FSR2H   register (frame pointer, high)
                        -   9       TBLPTRL register
                        -   8       TBLPTRH register
                        -   7       TBLPTRU register
                        -   6       PRODL   register
                        -   5       PRODH   register

                    (end repeating, based on number of items)
                        -   4       TOSL    (top of return stack, low)
                        -   3       TOSH    (top of return stack, high)
                        -   2       TOSU    (top of return stack, upper)
                    (start repeating, based on number of items)

                        -   1       (number of return stack items)

OSTCBHighRdy->OSTCBStkPtr - 0 -—> (free item) HIGH MEMORY