delay.c

TDK 6521 SOC 芯片 DEMO程序

/***************************************************************************
 * This code and information is provided "as is" without warranty of any   *
 * kind, either expressed or implied, including but not limited to the     *
 * implied warranties of merchantability and/or fitness for a particular   *
 * purpose.                                                                *
 *                                                                         *
 * Copyright (C) 2006 Teridian Semiconductor Corp. All Rights Reserved.    *
 ***************************************************************************/
//**************************************************************************
//    
//  DESCRIPTION: 71M65xx - Delay Routines. 
// 
//  AUTHOR:  RGV
//
//  HISTORY: See end of file
//
//**************************************************************************
//               
// File: DELAY.C
// This implements a looped delay. It adapts to clock rate changes.
//               
//**************************************************************************
// delay loop API.
//
#include "options.h"
#if 1 // DELAY
#include "batmodes.h"
#include "delay.h"

// delay at least r1/32768 seconds, even when running 4.9MHz clock
#pragma save
#pragma NOAREGS
#if TRACE10 || M6520
uint8r_t mclkitr[] = // map clocks to iterations
{ 10, 5, 3, 2, 1, 0, 0, 0 }; // assumes 15 clock cycles per inner loop
// the compiler doesn't even get close to compiling a DJNZ...
#else
#error unknown device
#endif
void delay_clks (uint8_t cclk) small reentrant
{
    register uint8_t r, rperclk;
    #if BROWNOUT_BATMODE
    if (batmode_is_brownout())
    {
        rperclk = 0;
    }
    else
    {
        rperclk = mclkitr[CONFIG0 & MPU_DIV];
    }
    #else
    rperclk = mclkitr[CONFIG0 & MPU_DIV];
    #endif
    if (rperclk == 0)
    {
        do {
        } while ((--cclk) != 0);
    }
    else
    {
        do {
            r = rperclk;
            do {
            } while ((--r) != 0);
        } while ((--cclk) != 0);
    }
}
#pragma restore

#if EXTRAS
#pragma save
#pragma NOAREGS
void delay (uint32_t cclk) small reentrant
{
    do {
        if(cclk > 255)
        {
            delay_clks (255);
            cclk -= 255;
        }
        else
        {
            delay_clks ((uint8_t)cclk);
            cclk = 0;
        }
    } while (cclk != 0);
}
#pragma restore
#endif

#endif // delay
/***************************************************************************
 * $Log: delay.c,v $
 * Revision 1.4  2006/10/13 00:47:27  tvander
 * Removed compile options for 6530, 6515;
 * renamed 6511 and 6513 to trace11 and trace13;
 * Binary verified unchanged from previous version.
 *
 * Revision 1.3  2006/09/09 01:09:09  gmikef
 * *** empty log message ***
 *
 * Revision 1.2  2006/09/06 21:40:03  tvander
 * Parameterized delay table for CPU
 *
 * Revision 1.1  2006/09/06 02:10:26  tvander
 * Separated delay loop into its own file.  Copes with different speeds, as best it can.
 *
 * 2006 september 5    First Version
 *
 * Copyright (C) 2006 Teridian Semiconductor Corp. All Rights Reserved.    *
 * this program is fully protected by the United States copyright          *
 * laws and is the property of Teridian Semiconductor Corporation.         *
 ***************************************************************************/