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李現路：在DSP6000中怎樣編寫您的第一個程序(二)
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李現路：在DSP6000中怎樣編寫您的第一個程序(二) Post By：2009-11-23 23:46:16
三、完整的中斷向量表程序如下：
.global _vectors ;定義一個能被外部（C語言程序）引用的變量
.global _c_int00
.global _vector1
.global _vector2
.global _vector3
.global _vector1
.global _vector5
.global _vector6
.global _vector7
.global _vector8
.global _vector9
.global _vector10
.global _vector11 ; Hookup the c_int08 ISR(連接這個中斷設置寄存器） in main()
.global _vector12 ; Hookup the c_int08 ISR in main()
.global _vector13
.global _vector14
.global _vector15
*------------------------------------------------------------------------------
* Global symbols referenced in this file but defined somewhere else.
* Remember that your interrupt service routines need to be referenced here.
*------------------------------------------------------------------------------
.ref _c_int00 ;reset ISR（復位中斷設置寄存）， .ref表明一個或多個在另一個模塊中定義而在前模塊中要用到的符號
*------------------------------------------------------------------------------
* This is a macro that instantiates one entry in the interrupt service table.
*------------------------------------------------------------------------------
VEC_ENTRY .macro addr ;中斷返回函數
STW B0,*--B15
MVKL addr,B0
MVKH addr,B0
B B0
LDW *B15++,B0
NOP 2
NOP
NOP
.endm
*------------------------------------------------------------------------------
* This is a dummy interrupt service routine used to initialize the IST.
*------------------------------------------------------------------------------
_vec_dummy: ;初始化IST寄存器（中斷向量表起始地址寄存器，用于設置中斷服務程序存放的地址）
B B3
NOP 5
*------------------------------------------------------------------------------
* This is the actual interrupt service table (IST). It is properly aligned and
* is located in the subsection .text:vecs. This means if you don't explicitly
* specify this section in your linker command file, it will default and link
* into the .text section. Remember to set the ISTP（中斷向量表起始地址寄存器） register to point to this
* table.
*------------------------------------------------------------------------------
.sect ".vecs" ;定義初始化帶名稱的段
.align 1024 ;分配程序頁
_vectors:
_vector0: VEC_ENTRY _c_int00 ;RESET（應用程序的入口）
_vector1: VEC_ENTRY _vec_dummy ;NMI（非屏蔽中斷，用于處理極為關鍵的任務）
_vector2: VEC_ENTRY _vec_dummy ;RSVD
_vector3: VEC_ENTRY _vec_dummy
_vector4: VEC_ENTRY _vec_dummy
_vector5: VEC_ENTRY _vec_dummy
_vector6: VEC_ENTRY _vec_dummy
_vector7: VEC_ENTRY _vec_dummy
_vector8: VEC_ENTRY _vec_dummy
_vector9: VEC_ENTRY _vec_dummy
_vector10: VEC_ENTRY _vec_dummy
_vector11: VEC_ENTRY _vec_dummy ; Hookup the c_int08 ISR in main()
_vector12: VEC_ENTRY _vec_dummy ; Hookup the c_int08 ISR in main()
_vector13: VEC_ENTRY _vec_dummy
_vector14: VEC_ENTRY _vec_dummy
_vector15: VEC_ENTRY _vec_dummy
