shift48.s43

msp430F437三相电表DEMO(编译器 IAR 3.42A）

//--------------------------------------------------------------------------
//
//  Software for MSP430 based e-meters.
//
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//	File: shift48.s43
//
//  Steve Underwood <[e-mail]>
//  Texas Instruments Hong Kong Ltd.
//
//  $Id$
//
//--------------------------------------------------------------------------
#include "io.h"

;void shift48(register int16_t x[3], int how_far)
    public shift48

    RSEG CODE
shift48
    cmp.w   #0,r14
    jl	    shift48_14
    add.w   #-1,r14
    cmp.w   #-1,r14
    jeq     shift48_1
shift48_11:
    rla.w   0(r15) 
    rlc.w   2(r15) 
    rlc.w   4(r15) 
    add.w   #-1,r14
    cmp.w   #-1,r14
    jne     shift48_11
shift48_1
#if defined(__MSP430_HAS_MSP430X_CPU__)
    reta
#else
    ret
#endif
shift48_14:
    add.w   #1,r14
    cmp.w   #1,r14
    jeq     shift48_7
shift48_6:
    rra.w   4(r15) 
    rrc.w   2(r15) 
    rrc.w   0(r15) 
    add.w   #1,r14
    cmp.w   #1,r14
    jne     shift48_6
shift48_7:
#if defined(__MSP430_HAS_MSP430X_CPU__)
    reta
#else
    ret
#endif
    end