blkwrite.asm

TMS320F2407A的例程

********************************************************************************
* Function: PFUNC_blkWrite()                                                   *
* File: blkWrite.asm                                                           *
* Author: David M. Alter, Texas Instruments Inc.                               *
* DSP: TMS320C24x                                                              *
* Language: TMS320C24x assembly (C-callable)                                   *
* Description: Copies a block of words from data space to program space.       *
* Function Prototype:                                                          *
*   extern void PFUNC_blkWrite(int *, int *, unsigned int);                    *
* Useage: PFUNC_blkWrite(addrProg, ptrData, length);                           *
* Passed Parameters:                                                           *
*   int *addrProg = address of program space block                             *
*   int *ptrData = pointer to data space block                                 *
*   unsigned int length = length of block                                      *
* Return Value: none                                                           *
* Notes: none                                                                  *
* History:                                                                     *
*   04/04/02 - original (D. Alter)                                             *
********************************************************************************

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**************************************************************

        .def _PFUNC_blkWrite

        .asg	AR1, SP

        .text
_PFUNC_blkWrite:
        POPD    *+                          ;pop return address off HW stack and push onto SW stack
        SAR     SP, *                       ;save SP to stack
        LAR     AR2, *, AR2                 ;make a copy of the stack pointer in AR2
        SBRK    #2                          ;AR2 now points to 1st passed parameter
        LACC    *-                          ;load 1st passed parameter into ACC
        LAR     AR3, *-                     ;load 2nd passed parameter into AR3
        LAR     AR4, *, AR4                 ;load 3rd passed parameter into AR4
        SBRK    #1                          ;AR4 = (length - 1)
        MAR     *, AR2                      ;ARP=AR2
        SAR     AR4, *                      ;put length-1 back onto the stack

        RPT     *, AR3                      ;repeat length-1 times 
        TBLW    *+                          ;write character to program space

        MAR     *, SP                       ;ARP=SP
        MAR     *-                          ;decrement SP
        PSHD    *                           ;push return address back onto the HW stack
        RET                                 ;return

        .end