isrvectors.asm

在Ti的c55平台下实现定时器的程序

        .mmregs
        .sect   "DspIntVectors"
        .def    _RSTInt
        .ref    start
        .ref    _A
        .ref    _B
        .ref    _C
        .ref    Num
        .ref    _y

_RSTInt     .ivec   start, USE_RETA     ;reset vector and stack mode
Nonmaskable .ivec   NoIsr       ;sint1
INT0        .ivec   NoIsr       ;sint2
INT2        .ivec   NoIsr       ;sint3
TINT0       .ivec   NoIsr       ;sint4
RINT0       .ivec   NoIsr       ;sint5
RINT1       .ivec   NoIsr       ;sint6
XINT1       .ivec   NoIsr       ;sint7
Soft8Int    .ivec   NoIsr       ;sint8
DAM1        .ivec   NoIsr       ;sint9
DSPINT      .ivec   NoIsr       ;sint10
INT3        .ivec   NoIsr       ;sint11
RINT2       .ivec   NoIsr       ;sint12
XINT2       .ivec   NoIsr       ;sint13
DMA4        .ivec   NoIsr       ;sint14
DMA5        .ivec   NoIsr       ;sint15
INT1        .ivec   NoIsr       ;sint16
XINT0       .ivec   NoIsr       ;sint17
DMA0        .ivec   NoIsr       ;sint18
INT4        .ivec   NoIsr       ;sint19
DMA2        .ivec   NoIsr       ;sint20
DMA3        .ivec   NoIsr       ;sint21
TINT1       .ivec   TINT1_Isr   ;Timer1 Interrupt Service
INT5        .ivec   NoIsr       ;sint23
Bus_Error   .ivec   NoIsr       ;sint24
Emu_26      .ivec   NoIsr       ;sint25
Emu_27      .ivec   NoIsr       ;sint26
Soft28Int   .ivec   NoIsr       ;sint27
Soft29Int   .ivec   NoIsr       ;sint28
Soft30Int   .ivec   NoIsr       ;sint29
Soft31Int   .ivec   NoIsr       ;sint30
Soft32Int   .ivec   NoIsr       ;sint31


        .text

NoIsr:
            NOP
            NOP
            RETI

TINT1_Isr:
        NOP

    ;Jump to the end of ISR, while the suffix is full,
    ;in order to avoid dirty the datas out of result array
        MOV *(#Num),T0
        BCC TINT1_Isr_end,T0>=#101

        MOV *(#_A),T1
        MOV #_y,AR0
        ADD T0,AR0
        MOV *AR0(#-1)<<#16,AC0
        MPY T1,AC0              ;AC0 = A * y(n-1)
        MOV *(#_B),T1
        MOV *AR0(#-2)<<#16,AC1
        MAC AC1,T1,AC0          ;AC0 = AC0 + B * y(n-2)
        MOV HI(AC0),T1
        MOV T1,AC1
        MOV #1,T1
        MOV AC1<<T1,*AR0        ;y(n) = HI(AC0) * 2

        ADD #1,T0
        MOV T0,*(#Num)          ;Suffix increasing

TINT1_Isr_end:

        NOP
        RETI


        .end