583 lines
21 KiB
C
583 lines
21 KiB
C
/**********************************************************************
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* $Id$ lpc_timer.c 2011-06-02
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*//**
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* @file lpc_timer.c
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* @brief Contains all functions support for Timer firmware library
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* on LPC
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* @version 1.0
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* @date 02. June. 2011
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* @author NXP MCU SW Application Team
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*
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* Copyright(C) 2011, 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 TIMER
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* @{
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*/
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#ifdef __BUILD_WITH_EXAMPLE__
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#include "lpc_libcfg.h"
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#else
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#include "lpc_libcfg_default.h"
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#endif /* __BUILD_WITH_EXAMPLE__ */
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#ifdef _TIM
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/* Includes ------------------------------------------------------------------- */
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#include "lpc_timer.h"
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#include "lpc_clkpwr.h"
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#include "lpc_pinsel.h"
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/* Private Functions ---------------------------------------------------------- */
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static uint32_t getPClock (uint32_t timernum);
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static uint32_t converUSecToVal (uint32_t timernum, uint32_t usec);
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static int32_t converPtrToTimeNum (LPC_TIM_TypeDef *TIMx);
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/*********************************************************************//**
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* @brief Get peripheral clock of each timer controller
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* @param[in] timernum Timer number
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* @return Peripheral clock of timer
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**********************************************************************/
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static uint32_t getPClock (uint32_t timernum)
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{
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uint32_t clkdlycnt;
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clkdlycnt = CLKPWR_GetCLK(CLKPWR_CLKTYPE_PER);
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return clkdlycnt;
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}
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/*********************************************************************//**
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* @brief Convert a time to a timer count value
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* @param[in] timernum Timer number
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* @param[in] usec Time in microseconds
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* @return The number of required clock ticks to give the time delay
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**********************************************************************/
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uint32_t converUSecToVal (uint32_t timernum, uint32_t usec)
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{
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uint64_t clkdlycnt;
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// Get Pclock of timer
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clkdlycnt = (uint64_t) getPClock(timernum);
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clkdlycnt = (clkdlycnt * usec) / 1000000;
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return (uint32_t) clkdlycnt;
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}
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/*********************************************************************//**
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* @brief Convert a timer register pointer to a timer number
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* @param[in] TIMx Pointer to LPC_TIM_TypeDef, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @return The timer number (0 to 3) or -1 if register pointer is bad
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**********************************************************************/
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int32_t converPtrToTimeNum (LPC_TIM_TypeDef *TIMx)
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{
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int32_t tnum = -1;
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if (TIMx == LPC_TIM0)
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{
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tnum = 0;
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}
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else if (TIMx == LPC_TIM1)
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{
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tnum = 1;
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}
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else if (TIMx == LPC_TIM2)
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{
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tnum = 2;
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}
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else if (TIMx == LPC_TIM3)
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{
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tnum = 3;
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}
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return tnum;
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}
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/* End of Private Functions ---------------------------------------------------- */
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/* Public Functions ----------------------------------------------------------- */
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/** @addtogroup TIM_Public_Functions
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* @{
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*/
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/*********************************************************************//**
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* @brief Get Interrupt Status
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* @param[in] TIMx Timer selection, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] IntFlag Interrupt type, should be:
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* - TIM_MR0_INT: Interrupt for Match channel 0
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* - TIM_MR1_INT: Interrupt for Match channel 1
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* - TIM_MR2_INT: Interrupt for Match channel 2
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* - TIM_MR3_INT: Interrupt for Match channel 3
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* - TIM_CR0_INT: Interrupt for Capture channel 0
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* - TIM_CR1_INT: Interrupt for Capture channel 1
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* @return Flag Status for required interrupt
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* - SET : interrupt
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* - RESET : no interrupt
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**********************************************************************/
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FlagStatus TIM_GetIntStatus(LPC_TIM_TypeDef *TIMx, TIM_INT_TYPE IntFlag)
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{
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uint8_t temp;
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temp = (TIMx->IR)& TIM_IR_CLR(IntFlag);
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if (temp)
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return SET;
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return RESET;
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}
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/*********************************************************************//**
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* @brief Get Capture Interrupt Status
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* @param[in] TIMx Timer selection, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] IntFlag: interrupt type, should be:
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* - TIM_MR0_INT: Interrupt for Match channel 0
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* - TIM_MR1_INT: Interrupt for Match channel 1
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* - TIM_MR2_INT: Interrupt for Match channel 2
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* - TIM_MR3_INT: Interrupt for Match channel 3
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* - TIM_CR0_INT: Interrupt for Capture channel 0
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* - TIM_CR1_INT: Interrupt for Capture channel 1
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* @return FlagStatus
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* - SET : interrupt
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* - RESET : no interrupt
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**********************************************************************/
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FlagStatus TIM_GetIntCaptureStatus(LPC_TIM_TypeDef *TIMx, TIM_INT_TYPE IntFlag)
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{
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uint8_t temp;
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temp = (TIMx->IR) & (1<<(4+IntFlag));
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if(temp)
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return SET;
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return RESET;
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}
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/*********************************************************************//**
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* @brief Clear Interrupt pending
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* @param[in] TIMx Timer selection, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] IntFlag: interrupt type, should be:
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* - TIM_MR0_INT: Interrupt for Match channel 0
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* - TIM_MR1_INT: Interrupt for Match channel 1
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* - TIM_MR2_INT: Interrupt for Match channel 2
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* - TIM_MR3_INT: Interrupt for Match channel 3
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* - TIM_CR0_INT: Interrupt for Capture channel 0
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* - TIM_CR1_INT: Interrupt for Capture channel 1
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* @return None
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**********************************************************************/
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void TIM_ClearIntPending(LPC_TIM_TypeDef *TIMx, TIM_INT_TYPE IntFlag)
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{
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TIMx->IR = TIM_IR_CLR(IntFlag);
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}
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/*********************************************************************//**
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* @brief Clear Capture Interrupt pending
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* @param[in] TIMx Timer selection, should be
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] IntFlag interrupt type, should be:
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* - TIM_MR0_INT: Interrupt for Match channel 0
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* - TIM_MR1_INT: Interrupt for Match channel 1
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* - TIM_MR2_INT: Interrupt for Match channel 2
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* - TIM_MR3_INT: Interrupt for Match channel 3
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* - TIM_CR0_INT: Interrupt for Capture channel 0
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* - TIM_CR1_INT: Interrupt for Capture channel 1
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* @return None
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**********************************************************************/
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void TIM_ClearIntCapturePending(LPC_TIM_TypeDef *TIMx, TIM_INT_TYPE IntFlag)
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{
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TIMx->IR = (1<<(4+IntFlag));
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}
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/*********************************************************************//**
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* @brief Configuration for Timer at initial time
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* @param[in] TimerCounterMode timer counter mode, should be:
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* - TIM_TIMER_MODE: Timer mode
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* - TIM_COUNTER_RISING_MODE: Counter rising mode
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* - TIM_COUNTER_FALLING_MODE: Counter falling mode
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* - TIM_COUNTER_ANY_MODE:Counter on both edges
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* @param[in] TIM_ConfigStruct pointer to TIM_TIMERCFG_Type or
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* TIM_COUNTERCFG_Type
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* @return None
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**********************************************************************/
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void TIM_ConfigStructInit(TIM_MODE_OPT TimerCounterMode, void *TIM_ConfigStruct)
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{
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if (TimerCounterMode == TIM_TIMER_MODE )
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{
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TIM_TIMERCFG_Type * pTimeCfg = (TIM_TIMERCFG_Type *)TIM_ConfigStruct;
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pTimeCfg->PrescaleOption = TIM_PRESCALE_USVAL;
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pTimeCfg->PrescaleValue = 1;
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}
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else
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{
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TIM_COUNTERCFG_Type * pCounterCfg = (TIM_COUNTERCFG_Type *)TIM_ConfigStruct;
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pCounterCfg->CountInputSelect = TIM_COUNTER_INCAP0;
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}
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}
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/*********************************************************************//**
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* @brief Initial Timer/Counter device
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* Set Clock frequency for Timer
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* Set initial configuration for Timer
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* @param[in] TIMx Timer selection, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] TimerCounterMode Timer counter mode, should be:
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* - TIM_TIMER_MODE: Timer mode
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* - TIM_COUNTER_RISING_MODE: Counter rising mode
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* - TIM_COUNTER_FALLING_MODE: Counter falling mode
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* - TIM_COUNTER_ANY_MODE:Counter on both edges
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* @param[in] TIM_ConfigStruct pointer to TIM_TIMERCFG_Type
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* that contains the configuration information for the
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* specified Timer peripheral.
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* @return None
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**********************************************************************/
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void TIM_Init(LPC_TIM_TypeDef *TIMx, TIM_MODE_OPT TimerCounterMode, void *TIM_ConfigStruct)
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{
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TIM_TIMERCFG_Type *pTimeCfg;
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TIM_COUNTERCFG_Type *pCounterCfg;
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//set power
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if (TIMx== LPC_TIM0)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM0, ENABLE);
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}
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else if (TIMx== LPC_TIM1)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM1, ENABLE);
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}
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else if (TIMx== LPC_TIM2)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM2, ENABLE);
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}
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else if (TIMx== LPC_TIM3)
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{
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM3, ENABLE);
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}
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TIMx->CTCR &= ~TIM_CTCR_MODE_MASK;
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TIMx->CTCR |= TIM_TIMER_MODE;
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TIMx->TC =0;
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TIMx->PC =0;
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TIMx->PR =0;
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TIMx->TCR |= (1<<1); //Reset Counter
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TIMx->TCR &= ~(1<<1); //release reset
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if (TimerCounterMode == TIM_TIMER_MODE )
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{
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pTimeCfg = (TIM_TIMERCFG_Type *)TIM_ConfigStruct;
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if (pTimeCfg->PrescaleOption == TIM_PRESCALE_TICKVAL)
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{
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TIMx->PR = pTimeCfg->PrescaleValue -1 ;
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}
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else
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{
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TIMx->PR = converUSecToVal (converPtrToTimeNum(TIMx),pTimeCfg->PrescaleValue)-1;
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}
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}
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else
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{
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pCounterCfg = (TIM_COUNTERCFG_Type *)TIM_ConfigStruct;
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TIMx->CTCR &= ~TIM_CTCR_INPUT_MASK;
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if (pCounterCfg->CountInputSelect == TIM_COUNTER_INCAP1)
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TIMx->CCR |= _BIT(2);
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}
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// Clear interrupt pending
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TIMx->IR = 0xFFFFFFFF;
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}
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/*********************************************************************//**
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* @brief Close Timer/Counter device
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* @param[in] TIMx Pointer to timer device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @return None
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**********************************************************************/
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void TIM_DeInit (LPC_TIM_TypeDef *TIMx)
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{
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// Disable timer/counter
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TIMx->TCR = 0x00;
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// Disable power
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if (TIMx== LPC_TIM0)
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM0, DISABLE);
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else if (TIMx== LPC_TIM1)
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM1, DISABLE);
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else if (TIMx== LPC_TIM2)
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM2, DISABLE);
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else if (TIMx== LPC_TIM3)
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CLKPWR_ConfigPPWR (CLKPWR_PCONP_PCTIM2, DISABLE);
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}
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/*********************************************************************//**
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* @brief Start/Stop Timer/Counter device
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* @param[in] TIMx Pointer to timer device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] NewState
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* - ENABLE : set timer enable
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* - DISABLE : disable timer
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* @return None
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**********************************************************************/
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void TIM_Cmd(LPC_TIM_TypeDef *TIMx, FunctionalState NewState)
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{
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if (NewState == ENABLE)
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{
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TIMx->TCR |= TIM_ENABLE;
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}
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else
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{
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TIMx->TCR &= ~TIM_ENABLE;
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}
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}
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/*********************************************************************//**
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* @brief Reset Timer/Counter device,
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* Make TC and PC are synchronously reset on the next
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* positive edge of PCLK
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* @param[in] TIMx Pointer to timer device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @return None
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**********************************************************************/
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void TIM_ResetCounter(LPC_TIM_TypeDef *TIMx)
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{
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TIMx->TCR |= TIM_RESET;
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TIMx->TCR &= ~TIM_RESET;
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}
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/*********************************************************************//**
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* @brief Configuration for Match register
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* @param[in] TIMx Pointer to timer device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] TIM_MatchConfigStruct Pointer to TIM_MATCHCFG_Type
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* - MatchChannel : choose channel 0 or 1
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* - IntOnMatch : if SET, interrupt will be generated when MRxx match
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* the value in TC
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* - StopOnMatch : if SET, TC and PC will be stopped whenM Rxx match
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* the value in TC
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* - ResetOnMatch : if SET, Reset on MR0 when MRxx match
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* the value in TC
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* -ExtMatchOutputType: Select output for external match
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* + 0: Do nothing for external output pin if match
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* + 1: Force external output pin to low if match
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* + 2: Force external output pin to high if match
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* + 3: Toggle external output pin if match
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* MatchValue: Set the value to be compared with TC value
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* @return None
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**********************************************************************/
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void TIM_ConfigMatch(LPC_TIM_TypeDef *TIMx, TIM_MATCHCFG_Type *TIM_MatchConfigStruct)
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{
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switch(TIM_MatchConfigStruct->MatchChannel)
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{
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case 0:
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TIMx->MR0 = TIM_MatchConfigStruct->MatchValue;
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break;
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case 1:
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TIMx->MR1 = TIM_MatchConfigStruct->MatchValue;
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break;
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case 2:
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TIMx->MR2 = TIM_MatchConfigStruct->MatchValue;
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break;
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case 3:
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TIMx->MR3 = TIM_MatchConfigStruct->MatchValue;
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break;
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default:
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//Error match value
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//Error loop
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while(1);
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}
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//interrupt on MRn
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TIMx->MCR &= ~ TIM_MCR_CHANNEL_MASKBIT(TIM_MatchConfigStruct->MatchChannel);
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if (TIM_MatchConfigStruct->IntOnMatch)
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TIMx->MCR |= TIM_INT_ON_MATCH(TIM_MatchConfigStruct->MatchChannel);
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//reset on MRn
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if (TIM_MatchConfigStruct->ResetOnMatch)
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TIMx->MCR |= TIM_RESET_ON_MATCH(TIM_MatchConfigStruct->MatchChannel);
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//stop on MRn
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if (TIM_MatchConfigStruct->StopOnMatch)
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TIMx->MCR |= TIM_STOP_ON_MATCH(TIM_MatchConfigStruct->MatchChannel);
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// match output type
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TIMx->EMR &= ~ TIM_EM_MASK(TIM_MatchConfigStruct->MatchChannel);
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TIMx->EMR |= TIM_EM_SET(TIM_MatchConfigStruct->MatchChannel,TIM_MatchConfigStruct->ExtMatchOutputType);
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}
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/*********************************************************************//**
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* @brief Update Match value
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* @param[in] TIMx Pointer to timer device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] MatchChannel Match channel, should be: 0..3
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* @param[in] MatchValue updated match value
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* @return None
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**********************************************************************/
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void TIM_UpdateMatchValue(LPC_TIM_TypeDef *TIMx,uint8_t MatchChannel, uint32_t MatchValue)
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{
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switch(MatchChannel)
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{
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case 0:
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TIMx->MR0 = MatchValue;
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break;
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case 1:
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TIMx->MR1 = MatchValue;
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break;
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case 2:
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TIMx->MR2 = MatchValue;
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break;
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case 3:
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TIMx->MR3 = MatchValue;
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break;
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default:
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//Error Loop
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while(1);
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}
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}
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/*********************************************************************//**
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* @brief Configuration for Capture register
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* @param[in] TIMx Pointer to timer device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] TIM_CaptureConfigStruct Pointer to TIM_CAPTURECFG_Type
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* - CaptureChannel: set the channel to capture data
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* - RisingEdge : if SET, Capture at rising edge
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* - FallingEdge : if SET, Capture at falling edge
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* - IntOnCaption : if SET, Capture generate interrupt
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* @return None
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**********************************************************************/
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void TIM_ConfigCapture(LPC_TIM_TypeDef *TIMx, TIM_CAPTURECFG_Type *TIM_CaptureConfigStruct)
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{
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TIMx->CCR &= ~TIM_CCR_CHANNEL_MASKBIT(TIM_CaptureConfigStruct->CaptureChannel);
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if (TIM_CaptureConfigStruct->RisingEdge)
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TIMx->CCR |= TIM_CAP_RISING(TIM_CaptureConfigStruct->CaptureChannel);
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if (TIM_CaptureConfigStruct->FallingEdge)
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TIMx->CCR |= TIM_CAP_FALLING(TIM_CaptureConfigStruct->CaptureChannel);
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if (TIM_CaptureConfigStruct->IntOnCaption)
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TIMx->CCR |= TIM_INT_ON_CAP(TIM_CaptureConfigStruct->CaptureChannel);
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}
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/*********************************************************************//**
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* @brief Read value of capture register in timer/counter device
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* @param[in] TIMx Pointer to timer/counter device, should be:
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* - LPC_TIM0: TIMER0 peripheral
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* - LPC_TIM1: TIMER1 peripheral
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* - LPC_TIM2: TIMER2 peripheral
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* - LPC_TIM3: TIMER3 peripheral
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* @param[in] CaptureChannel: capture channel number, should be:
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* - TIM_COUNTER_INCAP0: CAPn.0 input pin for TIMERn
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* - TIM_COUNTER_INCAP1: CAPn.1 input pin for TIMERn
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* @return Value of capture register
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**********************************************************************/
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uint32_t TIM_GetCaptureValue(LPC_TIM_TypeDef *TIMx, TIM_COUNTER_INPUT_OPT CaptureChannel)
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{
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if(CaptureChannel==0)
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return TIMx->CR0;
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else
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return TIMx->CR1;
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}
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/*---------------Advanced TIMER functions -----------------------------------------*/
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/*********************************************************************//**
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* @brief Timer wait (microseconds)
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* @param[in] time number of microseconds waiting
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* @return None
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**********************************************************************/
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void TIM_Waitus(uint32_t time)
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{
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TIM_MATCHCFG_Type MatchConfigStruct;
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LPC_TIM0->IR = 0xFFFFFFFF;
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MatchConfigStruct.MatchChannel = 0;
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MatchConfigStruct.IntOnMatch = ENABLE;
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MatchConfigStruct.ResetOnMatch = ENABLE;
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MatchConfigStruct.StopOnMatch = ENABLE;
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MatchConfigStruct.ExtMatchOutputType = 0;
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MatchConfigStruct.MatchValue = time;
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TIM_ConfigMatch(LPC_TIM0, &MatchConfigStruct);
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TIM_Cmd(LPC_TIM0,ENABLE);
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//wait until interrupt flag occur
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while(!(LPC_TIM0->IR & 0x01));
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TIM_ResetCounter(LPC_TIM0);
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}
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/*********************************************************************//**
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* @brief Timer wait (milliseconds)
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* @param[in] time number of millisecond waiting
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* @return None
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**********************************************************************/
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void TIM_Waitms(uint32_t time)
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{
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TIM_Waitus(time * 1000);
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}
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/**
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* @}
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*/
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#endif /*_TIM*/
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/**
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* @}
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*/
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/* --------------------------------- End Of File ------------------------------ */
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