dmt_asm.s

;/*******************************************************************************
;
;DMT Generated Driver Header File
; 
; @file      dmt_asm.s
; 
; @defgroup  dmtdriver DMT Driver
; 
; @brief     Assembly language optimized helper routines required for calibration
;
; @skipline @version   Firmware Driver Version 1.2.1
;
; @skipline @version   PLIB Version 1.1.0
;
; @skipline  Device : dsPIC33CH512MP506S1
;
;*******************************************************************************/
;
;// DOM-IGNORE-BEGIN
;/*******************************************************************************
;  Copyright (C) 2016 Microchip Technology Inc.
;
;  MICROCHIP SOFTWARE NOTICE AND DISCLAIMER:  You may use this software, and any
;  derivatives created by any person or entity by or on your behalf, exclusively
;  with Microchip's products.  Microchip and its licensors retain all ownership
;  and intellectual property rights in the accompanying software and in all
;  derivatives here to.
;
;  This software and any accompanying information is for suggestion only.  It
;  does not modify Microchip's standard warranty for its products.  You agree
;  that you are solely responsible for testing the software and determining its
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;
;  THIS SOFTWARE IS SUPPLIED BY MICROCHIP "AS IS".  NO WARRANTIES, WHETHER
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;*******************************************************************************/
 
 
/**
 * ;uint32_t  DMT_CalibratedCounterGet(void);
 * Gets the count of DMT counter just before calling CalibratedCounterGet function
 *
 * @param    none
 * @return   32-bit (unsigned long) caliberated count
 *                      
 *   Registers used:  w0 w1 w2
 *
 */
 
    .global         _DMT_CounterGet
    .global         _DMT_CalibratedCounterGet
    .global         _calibOffset
    .type           _DMT_CalibratedCounterGet, @function
    reset
    
 _DMT_CalibratedCounterGet:
        rcall _DMT_CounterGet
        push w2
        mov _calibOffset, w2
        SUBR w2, w0, w0
        mov #0x0, w2
        SUBBR w2, w1, w1
        pop w2
        return
    
/**
 * ;void  DMT_Calibrate(void);
 * Calculates and stores offset value during DMT_CounterGet function call
 *                      
 *   Registers used:  w0 w1 w2
 *
 */    
    
    .global         _DMT_CounterGet
    .global         _DMT_Calibrate
    .global         _calibOffset
    .type           _DMT_Calibrate, @function
    .extern         DMTCNTL
    reset
    
 _DMT_Calibrate:
        push w0
        push w1
        push w2
        mov DMTCNTL, w0
        push w0
        rcall _DMT_CounterGet
        pop w2
        sub w0, w2, w2
        dec w2, w2
        mov w2, _calibOffset
        pop w2
        pop w1
        pop w0
        return;