?? bsp_a.asm
字號:
;;************************************************************************************************; uC/OS-II; The Real-Time Kernel; ; (c) Copyright 2006, Micrium, Inc., Weston, FL; All Rights Reserved; ; File : bsp_a.asm; By : Jean J. Labrosse;*************************************************************************************************;;;*************************************************************************************************; PUBLIC DECLARATIONS;*************************************************************************************************; .global _OSTickISR;;**************************************************************************************************; EXTERNAL DECLARATIONS;**************************************************************************************************; .extern _OSIntNesting .extern _OSIntExit .extern _OSTCBCur .extern _OSTickISR_Handler .text ;;*******************************************************************************************; uC/OS-II's TICK ISR;; Description : This function services uC/OS-II's tick interrupts;; Arguments : none;*******************************************************************************************;_OSTickISR: MOVE.W #0x2700,SR ; Disable interrupts LEA -60(A7),A7 ; Save processor registers onto stack MOVEM.L D0-D7/A0-A6,(A7) MOVEQ.L #0,D0 ; OSIntNesting++ MOVE.B (_OSIntNesting),D0 ADDQ.L #1,D0 MOVE.B D0,(_OSIntNesting) CMPI.L #1, D0 ; if (OSIntNesting == 1) BNE _OSTickISR1 MOVE.L (_OSTCBCur), A1 ; OSTCBCur-<OSTCBStkPtr = SP MOVE.L A7,(A1)_OSTickISR1: JSR _OSTickISR_Handler ; OSTickISR_Handler() JSR _OSIntExit ; Exit the ISR MOVEM.L (A7),D0-D7/A0-A6 ; Restore processor registers from stack LEA 60(A7),A7 RTE ; Return to task or nested ISR ?? 快捷鍵說明
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