bsp_a.s

uCOS在PIC芯片中的移植：以PIC24HJ64GP210为例进行uCOS在Microchip芯片中的移植

;
;********************************************************************************************************
;                                               uC/OS-II
;                                         The Real-Time Kernel
;
;                         (c) Copyright 2002, Jean J. Labrosse, Weston, FL
;                                          All Rights Reserved
;
;
;                                  PIC24FJ Board Support Package
;                                                 
;
; File         : bsp_a.s
; By           : Eric Shufro
;********************************************************************************************************
;

;
;********************************************************************************************************
;                                                CONSTANTS
;********************************************************************************************************
;
    .equ     __24HJ64GP210, 1                                          ;//tbh080510 Inform the p24FJ128GA010 header file that we are using a p24FJ128GA010
    
;
;********************************************************************************************************
;                                                INCLUDES
;********************************************************************************************************
;

    .include "p24HJ64GP210.inc"                                        ;//tbh080510 Include assembly equates for various CPU registers and bit masks
    .include "os_cpu_util_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 __T2Interrupt    ;//tbh080602
    .global __T4Interrupt
    
;//tbh080521b
;********************************************************************************************************
;                                            OS Time Tick ISR Handler
;
; Description : This function services the OS Time Tick Interrupt when configured using Timer #2
;
; Notes       : All user interrupts should be defined as follows.
;********************************************************************************************************
;

;__T2Interrupt:
;    OS_REGS_SAVE                                                        ; 1) Save processor registers
    
;    inc.b _OSIntNesting                                                 ; 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:  
;    BCLR  IFS0, #T2IF                                                   ; 4) Clear the interrupt source

;    call _OS_Tick_ISR_Handler                                           ; 5) Call YOUR ISR Handler (May be a C function). In this case, the OS Tick ISR Handler
;    call _OSIntExit                                                     ; 6) Call OSIntExit() or decrement 1 from OSIntNesting
    
;    OS_REGS_RESTORE                                                     ; 7) Restore registers

;    retfie                                                              ; 8) Return from interrupt


;//tbh080521e

;
;********************************************************************************************************
;                                            OS Time Tick ISR Handler
;
; Description : This function services the OS Time Tick Interrupt when configured using Timer #4
;
; Notes       : All user interrupts should be defined as follows.
;********************************************************************************************************
;

__T4Interrupt:
    OS_REGS_SAVE                                                        ; 1) Save processor registers
    
    inc.b _OSIntNesting                                                 ; 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, T4_Cont    
    mov _OSTCBCur, w0
    mov w15, [w0]    

T4_Cont:  
    BCLR  IFS1, #T4IF                                                   ; 4) Clear the interrupt source
    
    call _OS_Tick_ISR_Handler                                           ; 5) Call YOUR ISR Handler (May be a C function). In this case, the OS Tick ISR Handler
    call _OSIntExit                                                     ; 6) Call OSIntExit() or decrement 1 from OSIntNesting
    
    OS_REGS_RESTORE                                                     ; 7) Restore registers

    retfie                                                              ; 8) Return from interrupt