200 lines
6.6 KiB
C
200 lines
6.6 KiB
C
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/**********************************************************************
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* $Id$ lpc17xx_rit.c 2010-05-21
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*//**
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* @file lpc17xx_rit.c
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* @brief Contains all functions support for RIT firmware library on LPC17xx
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* @version 2.0
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* @date 21. May. 2010
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2010, NXP Semiconductor
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* All rights reserved.
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*
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***********************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* NXP Semiconductors assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. NXP Semiconductors
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* reserves the right to make changes in the software without
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* notification. NXP Semiconductors also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, under NXP Semiconductors'
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* relevant copyright in the software, without fee, provided that it
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* is used in conjunction with NXP Semiconductors microcontrollers. This
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* copyright, permission, and disclaimer notice must appear in all copies of
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* this code.
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**********************************************************************/
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/* Peripheral group ----------------------------------------------------------- */
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/** @addtogroup RIT
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* @{
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*/
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/* Includes ------------------------------------------------------------------- */
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#include "lpc17xx_rit.h"
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#include "lpc17xx_clkpwr.h"
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/* If this source file built with example, the LPC17xx FW library configuration
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* file in each example directory ("lpc17xx_libcfg.h") must be included,
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* otherwise the default FW library configuration file must be included instead
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc17xx_libcfg.h"
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#else
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#include "lpc17xx_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _RIT
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup RIT_Public_Functions
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* @{
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*/
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/******************************************************************************//*
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* @brief Initial for RIT
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* - Turn on power and clock
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* - Setup default register values
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* @param[in] RITx is RIT peripheral selected, should be: LPC_RIT
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* @return None
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*******************************************************************************/
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void RIT_Init(LPC_RIT_TypeDef *RITx)
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{
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CHECK_PARAM(PARAM_RITx(RITx));
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCRIT, ENABLE);
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//Set up default register values
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RITx->RICOMPVAL = 0xFFFFFFFF;
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RITx->RIMASK = 0x00000000;
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RITx->RICTRL = 0x0C;
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RITx->RICOUNTER = 0x00000000;
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// Turn on power and clock
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}
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/******************************************************************************//*
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* @brief DeInitial for RIT
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* - Turn off power and clock
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* - ReSetup default register values
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* @param[in] RITx is RIT peripheral selected, should be: LPC_RIT
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* @return None
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*******************************************************************************/
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void RIT_DeInit(LPC_RIT_TypeDef *RITx)
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{
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CHECK_PARAM(PARAM_RITx(RITx));
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// Turn off power and clock
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCRIT, DISABLE);
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//ReSetup default register values
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RITx->RICOMPVAL = 0xFFFFFFFF;
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RITx->RIMASK = 0x00000000;
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RITx->RICTRL = 0x0C;
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RITx->RICOUNTER = 0x00000000;
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}
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/******************************************************************************//*
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* @brief Set compare value, mask value and time counter value
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* @param[in] RITx is RIT peripheral selected, should be: LPC_RIT
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* @param[in] time_interval: timer interval value (ms)
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* @return None
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*******************************************************************************/
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void RIT_TimerConfig(LPC_RIT_TypeDef *RITx, uint32_t time_interval)
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{
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uint32_t clock_rate, cmp_value;
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CHECK_PARAM(PARAM_RITx(RITx));
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// Get PCLK value of RIT
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clock_rate = CLKPWR_GetPCLK(CLKPWR_PCLKSEL_RIT);
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/* calculate compare value for RIT to generate interrupt at
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* specified time interval
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* COMPVAL = (RIT_PCLK * time_interval)/1000
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* (with time_interval unit is millisecond)
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*/
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cmp_value = (clock_rate /1000) * time_interval;
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RITx->RICOMPVAL = cmp_value;
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/* Set timer enable clear bit to clear timer to 0 whenever
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* counter value equals the contents of RICOMPVAL
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*/
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RITx->RICTRL |= (1<<1);
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}
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/******************************************************************************//*
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* @brief Enable/Disable Timer
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* @param[in] RITx is RIT peripheral selected, should be: LPC_RIT
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* @param[in] NewState New State of this function
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* -ENABLE: Enable Timer
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* -DISABLE: Disable Timer
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* @return None
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*******************************************************************************/
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void RIT_Cmd(LPC_RIT_TypeDef *RITx, FunctionalState NewState)
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{
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CHECK_PARAM(PARAM_RITx(RITx));
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CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
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//Enable or Disable Timer
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if(NewState==ENABLE)
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{
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RITx->RICTRL |= RIT_CTRL_TEN;
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}
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else
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{
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RITx->RICTRL &= ~RIT_CTRL_TEN;
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}
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}
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/******************************************************************************//*
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* @brief Timer Enable/Disable on debug
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* @param[in] RITx is RIT peripheral selected, should be: LPC_RIT
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* @param[in] NewState New State of this function
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* -ENABLE: The timer is halted whenever a hardware break condition occurs
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* -DISABLE: Hardware break has no effect on the timer operation
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* @return None
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*******************************************************************************/
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void RIT_TimerDebugCmd(LPC_RIT_TypeDef *RITx, FunctionalState NewState)
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{
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CHECK_PARAM(PARAM_RITx(RITx));
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CHECK_PARAM(PARAM_FUNCTIONALSTATE(NewState));
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//Timer Enable/Disable on break
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if(NewState==ENABLE)
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{
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RITx->RICTRL |= RIT_CTRL_ENBR;
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}
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else
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{
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RITx->RICTRL &= ~RIT_CTRL_ENBR;
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}
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}
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/******************************************************************************//*
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* @brief Check whether interrupt flag is set or not
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* @param[in] RITx is RIT peripheral selected, should be: LPC_RIT
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* @return Current interrupt status, could be: SET/RESET
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*******************************************************************************/
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IntStatus RIT_GetIntStatus(LPC_RIT_TypeDef *RITx)
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{
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IntStatus result;
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CHECK_PARAM(PARAM_RITx(RITx));
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if((RITx->RICTRL&RIT_CTRL_INTEN)==1) result= SET;
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else return RESET;
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//clear interrupt flag
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RITx->RICTRL |= RIT_CTRL_INTEN;
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return result;
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}
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/**
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* @}
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*/
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#endif /* _RIT */
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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