296 lines
11 KiB
C
296 lines
11 KiB
C
/***************************************************************************//**
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* @file
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* @brief Timer/counter (TIMER) Peripheral API for EFM32
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* @author Energy Micro AS
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* @version 2.3.2
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*******************************************************************************
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* @section License
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* <b>(C) Copyright 2010 Energy Micro AS, http://www.energymicro.com</b>
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*******************************************************************************
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*
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* This source code is the property of Energy Micro AS. The source and compiled
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* code may only be used on Energy Micro "EFM32" microcontrollers.
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*
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* This copyright notice may not be removed from the source code nor changed.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Energy Micro AS has no
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* obligation to support this Software. Energy Micro AS is providing the
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* Software "AS IS", with no express or implied warranties of any kind,
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* including, but not limited to, any implied warranties of merchantability
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* or fitness for any particular purpose or warranties against infringement
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* of any proprietary rights of a third party.
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*
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* Energy Micro AS will not be liable for any consequential, incidental, or
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* special damages, or any other relief, or for any claim by any third party,
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* arising from your use of this Software.
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*
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******************************************************************************/
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#include "efm32_timer.h"
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#include "efm32_cmu.h"
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#include "efm32_assert.h"
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/***************************************************************************//**
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* @addtogroup EFM32_Library
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* @{
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******************************************************************************/
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/***************************************************************************//**
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* @addtogroup TIMER
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* @brief Timer/Counter (TIMER) Peripheral API for EFM32
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* @details
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* The timer module consists of three main parts:
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* @li General timer config and enable control.
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* @li Compare/capture control.
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* @li Dead time insertion control (may not be available for all timers).
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* @{
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******************************************************************************/
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/*******************************************************************************
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******************************* DEFINES ***********************************
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******************************************************************************/
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/** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
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/** Validation of TIMER register block pointer reference for assert statements. */
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#if (TIMER_COUNT == 1)
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#define TIMER_REF_VALID(ref) ((ref) == TIMER0)
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#elif (TIMER_COUNT == 2)
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#define TIMER_REF_VALID(ref) (((ref) == TIMER0) || ((ref) == TIMER1))
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#elif (TIMER_COUNT == 3)
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#define TIMER_REF_VALID(ref) (((ref) == TIMER0) || \
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((ref) == TIMER1) || \
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((ref) == TIMER2))
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#elif (TIMER_COUNT == 4)
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#define TIMER_REF_VALID(ref) (((ref) == TIMER0) || \
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((ref) == TIMER1) || \
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((ref) == TIMER2) || \
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((ref) == TIMER3))
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#else
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#error Undefined number of timers.
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#endif
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/** Validation of TIMER compare/capture channel number */
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#define TIMER_CH_VALID(ch) ((ch) < 3)
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/** @endcond */
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/*******************************************************************************
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************************** GLOBAL FUNCTIONS *******************************
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******************************************************************************/
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/***************************************************************************//**
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* @brief
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* Start/stop TIMER.
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*
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* @param[in] timer
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* Pointer to TIMER peripheral register block.
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*
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* @param[in] enable
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* true to enable counting, false to disable.
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******************************************************************************/
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void TIMER_Enable(TIMER_TypeDef *timer, bool enable)
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{
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EFM_ASSERT(TIMER_REF_VALID(timer));
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if (enable)
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{
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timer->CMD = TIMER_CMD_START;
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}
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else
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{
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timer->CMD = TIMER_CMD_STOP;
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}
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}
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/***************************************************************************//**
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* @brief
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* Initialize TIMER.
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*
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* @details
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* Notice that counter top must be configured separately with for instance
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* TIMER_TopSet(). In addition, compare/capture and dead-time insertion
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* init must be initialized separately if used. That should probably
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* be done prior to the use of this function if configuring the TIMER to
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* start when initialization is completed.
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*
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* @param[in] timer
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* Pointer to TIMER peripheral register block.
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*
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* @param[in] init
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* Pointer to TIMER initialization structure.
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******************************************************************************/
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void TIMER_Init(TIMER_TypeDef *timer, const TIMER_Init_TypeDef *init)
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{
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EFM_ASSERT(TIMER_REF_VALID(timer));
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/* Stop timer if specified to be disabled (dosn't hurt if already stopped) */
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if (!(init->enable))
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{
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timer->CMD = TIMER_CMD_STOP;
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}
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/* Reset counter */
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timer->CNT = _TIMER_CNT_RESETVALUE;
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timer->CTRL =
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((uint32_t)(init->prescale) << _TIMER_CTRL_PRESC_SHIFT) |
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((uint32_t)(init->clkSel) << _TIMER_CTRL_CLKSEL_SHIFT) |
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((uint32_t)(init->fallAction) << _TIMER_CTRL_FALLA_SHIFT) |
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((uint32_t)(init->riseAction) << _TIMER_CTRL_RISEA_SHIFT) |
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((uint32_t)(init->mode) << _TIMER_CTRL_MODE_SHIFT) |
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(init->debugRun ? TIMER_CTRL_DEBUGRUN : 0) |
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(init->dmaClrAct ? TIMER_CTRL_DMACLRACT : 0) |
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(init->quadModeX4 ? TIMER_CTRL_QDM_X4 : 0) |
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(init->oneShot ? TIMER_CTRL_OSMEN : 0) |
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#if defined(_EFM32_GIANT_FAMILY) || defined(_EFM32_TINY_FAMILY)
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(init->count2x ? TIMER_CTRL_X2CNT : 0) |
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(init->ati ? TIMER_CTRL_ATI : 0) |
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#endif
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(init->sync ? TIMER_CTRL_SYNC : 0);
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/* Start timer if specified to be enabled (dosn't hurt if already started) */
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if (init->enable)
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{
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timer->CMD = TIMER_CMD_START;
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}
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}
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/***************************************************************************//**
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* @brief
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* Initialize TIMER compare/capture channel.
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*
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* @details
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* Notice that if operating channel in compare mode, the CCV and CCVB register
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* must be set separately as required.
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*
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* @param[in] timer
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* Pointer to TIMER peripheral register block.
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*
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* @param[in] ch
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* Compare/capture channel to init for.
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*
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* @param[in] init
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* Pointer to TIMER initialization structure.
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******************************************************************************/
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void TIMER_InitCC(TIMER_TypeDef *timer,
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unsigned int ch,
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const TIMER_InitCC_TypeDef *init)
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{
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EFM_ASSERT(TIMER_REF_VALID(timer));
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EFM_ASSERT(TIMER_CH_VALID(ch));
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timer->CC[ch].CTRL =
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((uint32_t)(init->eventCtrl) << _TIMER_CC_CTRL_ICEVCTRL_SHIFT) |
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((uint32_t)(init->edge) << _TIMER_CC_CTRL_ICEDGE_SHIFT) |
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((uint32_t)(init->prsSel) << _TIMER_CC_CTRL_PRSSEL_SHIFT) |
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((uint32_t)(init->cufoa) << _TIMER_CC_CTRL_CUFOA_SHIFT) |
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((uint32_t)(init->cofoa) << _TIMER_CC_CTRL_COFOA_SHIFT) |
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((uint32_t)(init->cmoa) << _TIMER_CC_CTRL_CMOA_SHIFT) |
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((uint32_t)(init->mode) << _TIMER_CC_CTRL_MODE_SHIFT) |
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(init->filter ? TIMER_CC_CTRL_FILT_ENABLE : 0) |
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(init->prsInput ? TIMER_CC_CTRL_INSEL_PRS : 0) |
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(init->coist ? TIMER_CC_CTRL_COIST : 0) |
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(init->outInvert ? TIMER_CC_CTRL_OUTINV : 0);
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}
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#ifdef TIMER_DTLOCK_LOCKKEY_LOCK
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/***************************************************************************//**
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* @brief
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* Lock the TIMER in order to protect some of its registers against unintended
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* modification.
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*
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* @details
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* Please refer to the reference manual for TIMER registers that will be
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* locked.
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*
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* @note
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* If locking the TIMER registers, they must be unlocked prior to using any
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* TIMER API functions modifying TIMER registers protected by the lock.
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*
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* @param[in] timer
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* Pointer to TIMER peripheral register block.
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******************************************************************************/
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void TIMER_Lock(TIMER_TypeDef *timer)
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{
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EFM_ASSERT(TIMER_REF_VALID(timer));
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timer->DTLOCK = TIMER_DTLOCK_LOCKKEY_LOCK;
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}
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#endif
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/***************************************************************************//**
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* @brief
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* Reset TIMER to same state as after a HW reset.
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*
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* @note
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* The ROUTE register is NOT reset by this function, in order to allow for
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* centralized setup of this feature.
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*
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* @param[in] timer
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* Pointer to TIMER peripheral register block.
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******************************************************************************/
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void TIMER_Reset(TIMER_TypeDef *timer)
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{
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int i;
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EFM_ASSERT(TIMER_REF_VALID(timer));
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/* Make sure disabled first, before resetting other registers */
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timer->CMD = TIMER_CMD_STOP;
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timer->CTRL = _TIMER_CTRL_RESETVALUE;
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timer->IEN = _TIMER_IEN_RESETVALUE;
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timer->IFC = _TIMER_IFC_MASK;
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timer->TOP = _TIMER_TOP_RESETVALUE;
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timer->TOPB = _TIMER_TOPB_RESETVALUE;
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timer->CNT = _TIMER_CNT_RESETVALUE;
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/* Do not reset route register, setting should be done independently */
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/* (Note: ROUTE register may be locked by DTLOCK register.) */
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for (i = 0; TIMER_CH_VALID(i); i++)
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{
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timer->CC[i].CTRL = _TIMER_CC_CTRL_RESETVALUE;
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timer->CC[i].CCV = _TIMER_CC_CCV_RESETVALUE;
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timer->CC[i].CCVB = _TIMER_CC_CCVB_RESETVALUE;
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}
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/* Reset dead time insertion module, no effect on timers without DTI */
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#ifdef TIMER_DTLOCK_LOCKKEY_UNLOCK
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/* Unlock DTI registers first in case locked */
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timer->DTLOCK = TIMER_DTLOCK_LOCKKEY_UNLOCK;
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timer->DTCTRL = _TIMER_DTCTRL_RESETVALUE;
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timer->DTTIME = _TIMER_DTTIME_RESETVALUE;
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timer->DTFC = _TIMER_DTFC_RESETVALUE;
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timer->DTOGEN = _TIMER_DTOGEN_RESETVALUE;
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timer->DTFAULTC = _TIMER_DTFAULTC_MASK;
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#endif
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}
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#ifdef TIMER_DTLOCK_LOCKKEY_UNLOCK
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/***************************************************************************//**
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* @brief
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* Unlock the TIMER so that writing to locked registers again is possible.
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*
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* @param[in] timer
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* Pointer to TIMER peripheral register block.
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******************************************************************************/
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void TIMER_Unlock(TIMER_TypeDef *timer)
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{
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EFM_ASSERT(TIMER_REF_VALID(timer));
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timer->DTLOCK = TIMER_DTLOCK_LOCKKEY_UNLOCK;
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}
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#endif
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/** @} (end addtogroup TIMER) */
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/** @} (end addtogroup EFM32_Library) */
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