168 lines
7.0 KiB
C
168 lines
7.0 KiB
C
|
/***************************************************************************//**
|
||
|
* @file TIME.c
|
||
|
* @brief Implementation of TIME Driver for RENESAS RL78G14 Processor.
|
||
|
* @author Dan Nechita
|
||
|
********************************************************************************
|
||
|
* Copyright 2012(c) Analog Devices, Inc.
|
||
|
*
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions are met:
|
||
|
* - Redistributions of source code must retain the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer.
|
||
|
* - Redistributions in binary form must reproduce the above copyright
|
||
|
* notice, this list of conditions and the following disclaimer in
|
||
|
* the documentation and/or other materials provided with the
|
||
|
* distribution.
|
||
|
* - Neither the name of Analog Devices, Inc. nor the names of its
|
||
|
* contributors may be used to endorse or promote products derived
|
||
|
* from this software without specific prior written permission.
|
||
|
* - The use of this software may or may not infringe the patent rights
|
||
|
* of one or more patent holders. This license does not release you
|
||
|
* from the requirement that you obtain separate licenses from these
|
||
|
* patent holders to use this software.
|
||
|
* - Use of the software either in source or binary form, must be run
|
||
|
* on or directly connected to an Analog Devices Inc. component.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR
|
||
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT,
|
||
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
|
* IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
||
|
* LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
*
|
||
|
********************************************************************************
|
||
|
* SVN Revision: $WCREV$
|
||
|
*******************************************************************************/
|
||
|
|
||
|
/******************************************************************************/
|
||
|
/***************************** Include Files **********************************/
|
||
|
/******************************************************************************/
|
||
|
#include "RDKRL78G14.h" // RDKRL78G14 definitions.
|
||
|
#include "TIME.h" // TIME definitions.
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/************************** Macros Definitions *******************************/
|
||
|
/*****************************************************************************/
|
||
|
#define TIMER_CNT_INTERVAL 65536
|
||
|
|
||
|
/*****************************************************************************/
|
||
|
/************************ Variables Declarations *****************************/
|
||
|
/*****************************************************************************/
|
||
|
unsigned short overflowCounter = 0;
|
||
|
|
||
|
/******************************************************************************/
|
||
|
/************************ Functions Definitions *******************************/
|
||
|
/******************************************************************************/
|
||
|
|
||
|
/***************************************************************************//**
|
||
|
* @brief INTTM00 interrupt service routine.
|
||
|
*
|
||
|
* @return None.
|
||
|
*******************************************************************************/
|
||
|
#pragma vector = INTTM00_vect
|
||
|
__interrupt static void Timer0InterruptHandler(void)
|
||
|
{
|
||
|
overflowCounter++;
|
||
|
}
|
||
|
|
||
|
/***************************************************************************//**
|
||
|
* @brief Initializes the timer used in this driver.
|
||
|
*
|
||
|
* @return status - Result of the initialization procedure.
|
||
|
* Example: 0 - if initialization was successful;
|
||
|
* -1 - if initialization was unsuccessful.
|
||
|
*******************************************************************************/
|
||
|
char TIME_Init(void)
|
||
|
{
|
||
|
PER0 |= 0x0001; // Enable Supply for Unit 0 that contains timers 0..7.
|
||
|
TT0 |= 0x0001; // Stop channel 0(Timer 0).
|
||
|
TPS0 = 0x0005; // CK00 = FCLK / 32.
|
||
|
TMR00 |= 0x0000; // CK00 input clock for channel 0.
|
||
|
TMMK00 = 1; // Disable INTTM00 interrupt.
|
||
|
TMIF00 = 0; // Clear INTM00 interrupt flag.
|
||
|
/* Set INTTM00 low priority */
|
||
|
TMPR100 = 1;
|
||
|
TMPR000 = 1;
|
||
|
/* Configure channel 0 as a interval timer. */
|
||
|
TMR00 |= 0x0000; // Interval timer mode.
|
||
|
TO0 &= ~0x0001; // Timer 0 output value is "0".
|
||
|
TOE0 &= ~0x0001; // Disable output of timer 0.
|
||
|
TMMK00 = 0; // Enable INTTM00 interrupt.
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/***************************************************************************//**
|
||
|
* @brief The timer begins to count in steps of microseconds(us) until the user
|
||
|
* calls a stop measurement function.
|
||
|
*
|
||
|
* @return None.
|
||
|
*******************************************************************************/
|
||
|
void TIME_StartMeasure(void)
|
||
|
{
|
||
|
TDR00 = 0xFFFF;
|
||
|
overflowCounter = 0;
|
||
|
TS0 |= 0x0001; // Start timer 0.
|
||
|
TMIF00 = 0; // Clear INTM00 interrupt flag.
|
||
|
}
|
||
|
|
||
|
/***************************************************************************//**
|
||
|
* @brief Stops the measurement process when the functions is called.
|
||
|
*
|
||
|
* @return Time(in microseconds) elapsed since the measurement began.
|
||
|
*******************************************************************************/
|
||
|
unsigned long TIME_StopMeasure(void)
|
||
|
{
|
||
|
unsigned long elapsedUs = 0;
|
||
|
unsigned short timerCnt = 0;
|
||
|
|
||
|
timerCnt = TCR00;
|
||
|
TT0 |= 0x0001; // Stop Timer 0.
|
||
|
TMIF00 = 0; // Clear INTM00 interrupt flag.
|
||
|
overflowCounter = 0;
|
||
|
elapsedUs = ((unsigned long)overflowCounter * TIMER_CNT_INTERVAL) +
|
||
|
(0xFFFF - timerCnt);
|
||
|
|
||
|
return elapsedUs;
|
||
|
}
|
||
|
|
||
|
/***************************************************************************//**
|
||
|
* @brief Creates a delay of microseconds.
|
||
|
*
|
||
|
* @return None.
|
||
|
*******************************************************************************/
|
||
|
void TIME_DelayUs(unsigned short usUnits)
|
||
|
{
|
||
|
TDR00 = usUnits;
|
||
|
TS0 |= 0x0001; // Start timer 0.
|
||
|
while(!overflowCounter)
|
||
|
{
|
||
|
;
|
||
|
}
|
||
|
overflowCounter = 0;
|
||
|
TT0 |= 0x0001; // Stop Timer 0.
|
||
|
}
|
||
|
|
||
|
/***************************************************************************//**
|
||
|
* @brief Creates a delay of milliseconds.
|
||
|
*
|
||
|
* @return None.
|
||
|
*******************************************************************************/
|
||
|
void TIME_DelayMs(unsigned short msUnits)
|
||
|
{
|
||
|
TDR00 = 0x3E7; // 0x3E7 = 999(decimal). Timer will count down to 0.
|
||
|
TS0 |= 0x0001; // Start timer 0.
|
||
|
while(overflowCounter < msUnits)
|
||
|
{
|
||
|
;
|
||
|
}
|
||
|
overflowCounter = 0;
|
||
|
TT0 |= 0x0001; // Stop Timer 0.
|
||
|
}
|