153 lines
4.8 KiB
C
153 lines
4.8 KiB
C
/*
|
|
* @brief LPC15xx RITimer driver
|
|
*
|
|
* @note
|
|
* Copyright(C) NXP Semiconductors, 2013
|
|
* All rights reserved.
|
|
*
|
|
* @par
|
|
* Software that is described herein is for illustrative purposes only
|
|
* which provides customers with programming information regarding the
|
|
* LPC products. This software is supplied "AS IS" without any warranties of
|
|
* any kind, and NXP Semiconductors and its licensor disclaim any and
|
|
* all warranties, express or implied, including all implied warranties of
|
|
* merchantability, fitness for a particular purpose and non-infringement of
|
|
* intellectual property rights. NXP Semiconductors assumes no responsibility
|
|
* or liability for the use of the software, conveys no license or rights under any
|
|
* patent, copyright, mask work right, or any other intellectual property rights in
|
|
* or to any products. NXP Semiconductors reserves the right to make changes
|
|
* in the software without notification. NXP Semiconductors also makes no
|
|
* representation or warranty that such application will be suitable for the
|
|
* specified use without further testing or modification.
|
|
*
|
|
* @par
|
|
* Permission to use, copy, modify, and distribute this software and its
|
|
* documentation is hereby granted, under NXP Semiconductors' and its
|
|
* licensor's relevant copyrights in the software, without fee, provided that it
|
|
* is used in conjunction with NXP Semiconductors microcontrollers. This
|
|
* copyright, permission, and disclaimer notice must appear in all copies of
|
|
* this code.
|
|
*/
|
|
|
|
#include "chip.h"
|
|
|
|
/*****************************************************************************
|
|
* Private types/enumerations/variables
|
|
****************************************************************************/
|
|
|
|
/*****************************************************************************
|
|
* Public types/enumerations/variables
|
|
****************************************************************************/
|
|
|
|
/*****************************************************************************
|
|
* Private functions
|
|
****************************************************************************/
|
|
|
|
/*****************************************************************************
|
|
* Public functions
|
|
****************************************************************************/
|
|
|
|
/* Initialize the RIT */
|
|
void Chip_RIT_Init(LPC_RITIMER_T *pRITimer)
|
|
{
|
|
Chip_Clock_EnablePeriphClock(SYSCTL_CLOCK_RIT);
|
|
Chip_SYSCTL_PeriphReset(RESET_RIT);
|
|
pRITimer->CTRL = 0x04;
|
|
}
|
|
|
|
/* DeInitialize the RIT */
|
|
void Chip_RIT_DeInit(LPC_RITIMER_T *pRITimer)
|
|
{
|
|
pRITimer->CTRL = 0x00;
|
|
Chip_Clock_DisablePeriphClock(SYSCTL_CLOCK_RIT);
|
|
}
|
|
|
|
/* Safely sets CTRL register bits */
|
|
void Chip_RIT_SetCTRL(LPC_RITIMER_T *pRITimer, uint32_t val)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = pRITimer->CTRL & 0xF;
|
|
pRITimer->CTRL = reg | val;
|
|
}
|
|
|
|
/* Safely clears CTRL register bits */
|
|
void Chip_RIT_ClearCTRL(LPC_RITIMER_T *pRITimer, uint32_t val)
|
|
{
|
|
uint32_t reg;
|
|
|
|
reg = pRITimer->CTRL & 0xF;
|
|
pRITimer->CTRL = reg & ~val;
|
|
}
|
|
|
|
/* Set a tick value for the interrupt to time out */
|
|
void Chip_RIT_SetCompareValue(LPC_RITIMER_T *pRITimer, uint64_t val)
|
|
{
|
|
pRITimer->COMPVAL = (uint32_t) val;
|
|
pRITimer->COMPVAL_H = (uint32_t) (val >> 32);
|
|
}
|
|
|
|
/* Returns the current timer compare value */
|
|
uint64_t Chip_RIT_GetCompareValue(LPC_RITIMER_T *pRITimer)
|
|
{
|
|
uint64_t val;
|
|
|
|
val = (uint64_t) pRITimer->COMPVAL_H;
|
|
val = val << 32;
|
|
val |= (uint64_t) pRITimer->COMPVAL;
|
|
|
|
return val;
|
|
}
|
|
|
|
/* Sets a mask value used for bit based compare */
|
|
void Chip_RIT_SetMaskValue(LPC_RITIMER_T *pRITimer, uint64_t mask)
|
|
{
|
|
pRITimer->MASK = (uint32_t) mask;
|
|
pRITimer->MASK_H = (uint32_t) (mask >> 32);
|
|
}
|
|
|
|
/* Returns the mask value used for bit based compare */
|
|
uint64_t Chip_RIT_GetMaskValue(LPC_RITIMER_T *pRITimer)
|
|
{
|
|
uint64_t val;
|
|
|
|
val = (uint64_t) pRITimer->MASK_H;
|
|
val = val << 32;
|
|
val |= (uint64_t) pRITimer->MASK;
|
|
|
|
return val;
|
|
}
|
|
|
|
/* Sets the current timer Counter value */
|
|
void Chip_RIT_SetCounter(LPC_RITIMER_T *pRITimer, uint64_t count)
|
|
{
|
|
pRITimer->COUNTER = (uint32_t) count;
|
|
pRITimer->COUNTER_H = (uint32_t) (count >> 32);
|
|
}
|
|
|
|
/* Returns the current timer Counter value */
|
|
uint64_t Chip_RIT_GetCounter(LPC_RITIMER_T *pRITimer)
|
|
{
|
|
uint64_t val;
|
|
|
|
val = (uint64_t) pRITimer->COUNTER_H;
|
|
val = val << 32;
|
|
val |= (uint64_t) pRITimer->COUNTER;
|
|
|
|
return val;
|
|
}
|
|
|
|
/* Set timer interval value in Hz (frequency) */
|
|
void Chip_RIT_SetTimerIntervalHz(LPC_RITIMER_T *pRITimer, uint32_t freq)
|
|
{
|
|
uint64_t cmp_value;
|
|
|
|
/* Determine approximate compare value based on clock rate and passed interval */
|
|
cmp_value = (uint64_t) Chip_Clock_GetSystemClockRate();
|
|
cmp_value = cmp_value / (uint64_t) freq;
|
|
|
|
/* Set timer compare value and periodic mode */
|
|
Chip_RIT_SetCompareValue(pRITimer, cmp_value);
|
|
Chip_RIT_EnableCompClear(pRITimer);
|
|
}
|