os_cpu_isr.s

uc_os II__PIC24fj128ga010

;
;********************************************************************************************************
;                                               uC/OS-II
;                                         The Real-Time Kernel
;
;                         (c) Copyright 2002, Jean J. Labrosse, Weston, FL
;                                          All Rights Reserved
;
;
;                              dsPIC24FJ128GA010 Board Support Package
;
;
; File         : OS_CPU_ISR.s
; By           : 不负责任的天使(^_^)
;********************************************************************************************************
;

;
;********************************************************************************************************
;                                                CONSTANTS
;********************************************************************************************************
;
    .equ     __24FJ128GA010, 1                                          ; Inform the p24FJ128GA010 header file that we are using a p24FJ128GA010

;
;********************************************************************************************************
;                                                INCLUDES
;********************************************************************************************************
;

    .include "p24FJ128GA010.inc"                                        ; Include assembly equates for various CPU registers and bit masks
    .include "\UCOS-II V2.52\OS_CPU_REG_A.S"                                         ; Include an assembly utility files with macros for saving and restoring the CPU registers


;
;********************************************************************************************************
;                                             LINKER SPECIFICS
;********************************************************************************************************
;

    .text                                                               ; Locate this file in the text region of the build

;
;********************************************************************************************************
;                                                 GLOBALS
;********************************************************************************************************
;

    .global __T1Interrupt
;   
;
;********************************************************************************************************
;                                            OS Time Tick ISR
;
; Description : This function services the OS Time Tick Interrupt when configured using Timer #2
;
; Notes       : All user interrupts should be defined as follows.
;********************************************************************************************************
;

__T1Interrupt:
    OS_REGS_SAVE                                                        ; 1) Save processor registers

    mov   #_OSIntNesting, w1
    inc.b [w1], [w1]                                                    ; 2) Call OSIntEnter() or increment OSIntNesting

    dec.b _OSIntNesting, wreg                                           ; 3) Check OSIntNesting. if OSIntNesting == 1, then save the stack pointer, otherwise jump to T2_Cont
    bra nz, T2_Cont
    mov _OSTCBCur, w0
    mov w15, [w0]

T2_Cont:
    call _OSTimeTick                                           ; 4) Call YOUR ISR Handler (May be a C function). In this case, the OS Tick ISR Handler
    bclr IFS0, #3       ;将T1IF标志位清零
	call _OSIntExit                                                     ; 5) Call OSIntExit() or decrement 1 from OSIntNesting

    OS_REGS_RESTORE                                                     ; 6) Restore registers

    retfie                                                              ; 7) Return from interrupt