254 lines
10 KiB
C
254 lines
10 KiB
C
/***************************************************************************//**
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* @file em_timer.c
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* @brief Timer/counter (TIMER) Peripheral API
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* @version 5.2.2
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*******************************************************************************
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* # License
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* <b>Copyright 2016 Silicon Laboratories, Inc. http://www.silabs.com</b>
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*******************************************************************************
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*
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* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
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* obligation to support this Software. Silicon Labs 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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* Silicon Labs 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 "em_timer.h"
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#if defined(TIMER_COUNT) && (TIMER_COUNT > 0)
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#include "em_assert.h"
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/***************************************************************************//**
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* @addtogroup emlib
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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
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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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************************** GLOBAL FUNCTIONS *******************************
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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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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 = ((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(TIMER_CTRL_X2CNT) && defined(TIMER_CTRL_ATI)
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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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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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#if defined(_TIMER_DTCTRL_MASK)
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/***************************************************************************//**
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* @brief
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* Initialize the TIMER DTI unit.
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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 DTI initialization structure.
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******************************************************************************/
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void TIMER_InitDTI(TIMER_TypeDef *timer, const TIMER_InitDTI_TypeDef *init)
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{
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EFM_ASSERT(TIMER0 == timer);
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/* Make sure the DTI unit is disabled while initializing. */
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TIMER_EnableDTI(timer, false);
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/* Setup the DTCTRL register.
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The enable bit will be set at the end of the function if specified. */
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timer->DTCTRL =
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(init->autoRestart ? TIMER_DTCTRL_DTDAS : 0)
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| (init->activeLowOut ? TIMER_DTCTRL_DTIPOL : 0)
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| (init->invertComplementaryOut ? TIMER_DTCTRL_DTCINV : 0)
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| (init->enablePrsSource ? TIMER_DTCTRL_DTPRSEN : 0)
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| ((uint32_t)(init->prsSel) << _TIMER_DTCTRL_DTPRSSEL_SHIFT);
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/* Setup the DTTIME register. */
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timer->DTTIME =
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((uint32_t)(init->prescale) << _TIMER_DTTIME_DTPRESC_SHIFT)
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| ((uint32_t)(init->riseTime) << _TIMER_DTTIME_DTRISET_SHIFT)
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| ((uint32_t)(init->fallTime) << _TIMER_DTTIME_DTFALLT_SHIFT);
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/* Setup the DTFC register. */
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timer->DTFC =
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(init->enableFaultSourceCoreLockup ? TIMER_DTFC_DTLOCKUPFEN : 0)
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| (init->enableFaultSourceDebugger ? TIMER_DTFC_DTDBGFEN : 0)
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| (init->enableFaultSourcePrsSel0 ? TIMER_DTFC_DTPRS0FEN : 0)
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| (init->enableFaultSourcePrsSel1 ? TIMER_DTFC_DTPRS1FEN : 0)
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| ((uint32_t)(init->faultAction) << _TIMER_DTFC_DTFA_SHIFT)
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| ((uint32_t)(init->faultSourcePrsSel0) << _TIMER_DTFC_DTPRS0FSEL_SHIFT)
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| ((uint32_t)(init->faultSourcePrsSel1) << _TIMER_DTFC_DTPRS1FSEL_SHIFT);
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/* Setup the DTOGEN register. */
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timer->DTOGEN = init->outputsEnableMask;
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/* Clear any previous DTI faults. */
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TIMER_ClearDTIFault(timer, TIMER_GetDTIFault(timer));
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/* Enable/disable before returning. */
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TIMER_EnableDTI(timer, init->enable);
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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->TOPB = _TIMER_TOPB_RESETVALUE;
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/* Write TOP after TOPB to invalidate TOPB (clear TIMER_STATUS_TOPBV) */
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timer->TOP = _TIMER_TOP_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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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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#if defined(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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/** @} (end addtogroup TIMER) */
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/** @} (end addtogroup emlib) */
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#endif /* defined(TIMER_COUNT) && (TIMER_COUNT > 0) */
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