isr.asm

在dsp芯片TOM320VC5402下的codec编程

    ;; DSP/BIOS includes
    .include c54.h54
    .include gbl.h54
    .include hwi.h54

    .ref _handsetCodecService
    
    .global handsetCodecIsr

handsetCodecIsr:

    HWI_enter C54_CNOTPRESERVED, 0ffffh
    ; cpl = 0
    ; dp = GBL_A_SYSPAGE

    ; We need to set cpl bit when going to C
    ssbx      cpl
    nop                             ; cpl latency

    call      _handsetCodecService  ; call c service function

    rsbx      cpl                   ; HWI_exit precondition
    nop                             ; cpl latency

    ld        #GBL_A_SYSPAGE, dp

    HWI_exit  C54_CNOTPRESERVED, 0ffffh

	.end