wordwrite.asm

TMS320F2407A的例程

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

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

        .def _PFUNC_wordWrite

        .asg	AR1, SP

        .text
_PFUNC_wordWrite:
        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
        TBLW    *, SP                       ;write character to program space

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

        .end