mbed-os/targets/TARGET_Maxim/TARGET_MAX32625/mxc/tmr_utils.c

/*******************************************************************************
 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
 *
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 * The above copyright notice and this permission notice shall be included
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the name of Maxim Integrated
 * Products, Inc. shall not be used except as stated in the Maxim Integrated
 * Products, Inc. Branding Policy.
 *
 * The mere transfer of this software does not imply any licenses
 * of trade secrets, proprietary technology, copyrights, patents,
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 *
 * $Date: 2016-03-11 11:46:37 -0600 (Fri, 11 Mar 2016) $
 * $Revision: 21839 $
 *
 ******************************************************************************/

/**
 * @file    tmr_utils.c
 * @brief   Timer utility functions.
 */

/***** Includes *****/
#include <stddef.h>
#include "mxc_assert.h"
#include "tmr.h"
#include "tmr_utils.h"

/***** Definitions *****/

/***** Globals *****/

/***** Functions *****/

/******************************************************************************/
void TMR_Delay(mxc_tmr_regs_t* tmr, unsigned long us)
{
    TMR_TO_Start(tmr, us);

    while(TMR_TO_Check(tmr) != E_TIME_OUT) {}
}

/******************************************************************************/
void TMR_TO_Start(mxc_tmr_regs_t* tmr, unsigned long us)
{
    unsigned clk_shift = 0;
    uint64_t max_us;
    uint32_t ticks;

    // Adjust the clk shift amout by how long the timeout is
    // Start with the fastest clock to give the greatest accuracy
    do {
        max_us = (uint64_t)((0xFFFFFFFFUL / ((uint64_t)SystemCoreClock >> clk_shift++)) * 1000000UL);
    } while(us > max_us);

    // Calculate the number of timer ticks we need to wait
    TMR_Init(tmr, (tmr_prescale_t)clk_shift, NULL);
    TMR32_TimeToTicks(tmr, us, TMR_UNIT_MICROSEC, &ticks);

    // Initialize the timer in one-shot mode
    tmr32_cfg_t cfg;
    cfg.mode = TMR32_MODE_ONE_SHOT;
    cfg.compareCount = ticks;
    TMR32_Stop(tmr);
    TMR32_Config(tmr, &cfg);

    TMR32_ClearFlag(tmr);
    TMR32_Start(tmr);
}

/******************************************************************************/
int TMR_TO_Check(mxc_tmr_regs_t* tmr)
{
    if(TMR32_GetFlag(tmr)) {
        return E_TIME_OUT;
    }
    return E_NO_ERROR;
}

/******************************************************************************/
void TMR_TO_Stop(mxc_tmr_regs_t* tmr)
{
    TMR32_Stop(tmr);
    TMR32_SetCount(tmr, 0x0);
}

/******************************************************************************/
void TMR_TO_Clear(mxc_tmr_regs_t* tmr)
{
    TMR32_ClearFlag(tmr);
    TMR32_SetCount(tmr, 0x0);
}

/******************************************************************************/
unsigned TMR_TO_Elapsed(mxc_tmr_regs_t* tmr)
{
    uint32_t elapsed;
    tmr_unit_t units;

    TMR_TicksToTime(tmr, TMR32_GetCount(tmr), &elapsed, &units);

    switch(units) {
        case TMR_UNIT_NANOSEC:
        default:
            return (elapsed / 1000);
        case TMR_UNIT_MICROSEC:
            return (elapsed);
        case TMR_UNIT_MILLISEC:
            return (elapsed * 1000);
        case TMR_UNIT_SEC:
            return (elapsed * 1000000);
    }
}

/******************************************************************************/
unsigned TMR_TO_Remaining(mxc_tmr_regs_t* tmr)
{
    uint32_t remaining_ticks, remaining_time;
    tmr_unit_t units;

    remaining_ticks = TMR32_GetCompare(tmr) - TMR32_GetCount(tmr);
    TMR_TicksToTime(tmr, remaining_ticks, &remaining_time, &units);

    switch(units) {
        case TMR_UNIT_NANOSEC:
        default:
            return (remaining_time / 1000);
        case TMR_UNIT_MICROSEC:
            return (remaining_time);
        case TMR_UNIT_MILLISEC:
            return (remaining_time * 1000);
        case TMR_UNIT_SEC:
            return (remaining_time * 1000000);
    }
}

/******************************************************************************/
void TMR_SW_Start(mxc_tmr_regs_t* tmr)
{
    TMR_TO_Start(tmr, 0xFFFFFFFF);
}

/******************************************************************************/
unsigned TMR_SW_Stop(mxc_tmr_regs_t* tmr)
{
    unsigned elapsed = TMR_TO_Elapsed(tmr);
    TMR_TO_Stop(tmr);
    return elapsed;
}