160 lines
6.6 KiB
C
160 lines
6.6 KiB
C
/* =========================================================================== *
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* Copyright (c) 2015-2017, Infineon Technologies AG *
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* All rights reserved. *
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* *
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* Redistribution and use in source and binary forms, with or without *
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* modification, are permitted provided that the following conditions are met: *
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* Redistributions of source code must retain the above copyright notice, this *
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* list of conditions and the following disclaimer. Redistributions in binary *
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* form must reproduce the above copyright notice, this list of conditions and *
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* the following disclaimer in the documentation and/or other materials *
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* provided with the distribution. Neither the name of the copyright holders *
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* nor the names of its contributors may be used to endorse or promote *
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* products derived from this software without specific prior written *
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* permission. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" *
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, *
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR *
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR *
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; *
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, *
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR *
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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* To improve the quality of the software, users are encouraged to share *
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* modifications, enhancements or bug fixes with *
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* Infineon Technologies AG (dave@infineon.com). *
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* *
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* =========================================================================== */
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/**
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* @file
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* @date 15 April, 2017
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* @version 1.0.0
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*
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* History <br>
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*
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* Version 1.0.0 Initial <br>
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*
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*/
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/*********************************************************************************************************************
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* HEADER FILES
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********************************************************************************************************************/
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#include "xmc_gpio.h"
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#include "timer.h"
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#include "timer.h"
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#include <xmc_scu.h>
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#include <xmc_ccu4.h>
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/*********************************************************************************************************************
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* API IMPLEMENTATION
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********************************************************************************************************************/
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/**
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* User timer callback
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*/
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__WEAK void timer_cb()
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{
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}
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void CCU40_0_IRQHandler(void)
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{
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timer_cb();
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}
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void TIMER_Init(uint32_t divider)
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{
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XMC_CCU4_SLICE_COMPARE_CONFIG_t slice_config;
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XMC_CCU4_SLICE_EVENT_CONFIG_t event_config =
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{
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.mapped_input = CCU40_IN0_SCU_GSC40,
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.edge = XMC_CCU4_SLICE_EVENT_EDGE_SENSITIVITY_RISING_EDGE
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};
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/* Init CCU4x module */
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XMC_CCU4_Init(CCU40, XMC_CCU4_SLICE_MCMS_ACTION_TRANSFER_PR_CR);
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XMC_STRUCT_INIT(slice_config);
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slice_config.prescaler_initval = divider;
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XMC_CCU4_SLICE_CompareInit(CCU40_CC40, &slice_config);
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slice_config.timer_concatenation = true;
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XMC_CCU4_SLICE_CompareInit(CCU40_CC41, &slice_config);
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XMC_CCU4_SLICE_SetTimerPeriodMatch(CCU40_CC40, 0xffffU);
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XMC_CCU4_SLICE_SetTimerPeriodMatch(CCU40_CC41, 0xffffU);
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// Configure event to start synchronously the two slices
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XMC_CCU4_SLICE_ConfigureEvent(CCU40_CC40, XMC_CCU4_SLICE_EVENT_0, &event_config);
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XMC_CCU4_SLICE_ConfigureEvent(CCU40_CC41, XMC_CCU4_SLICE_EVENT_0, &event_config);
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XMC_CCU4_SLICE_StartConfig(CCU40_CC40, XMC_CCU4_SLICE_EVENT_0, XMC_CCU4_SLICE_START_MODE_TIMER_START);
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XMC_CCU4_SLICE_StartConfig(CCU40_CC41, XMC_CCU4_SLICE_EVENT_0, XMC_CCU4_SLICE_START_MODE_TIMER_START);
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// Configure event to stop synchronously the two slices
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event_config.edge = XMC_CCU4_SLICE_EVENT_EDGE_SENSITIVITY_FALLING_EDGE;
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XMC_CCU4_SLICE_ConfigureEvent(CCU40_CC40, XMC_CCU4_SLICE_EVENT_1, &event_config);
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XMC_CCU4_SLICE_ConfigureEvent(CCU40_CC41, XMC_CCU4_SLICE_EVENT_1, &event_config);
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XMC_CCU4_SLICE_StopConfig(CCU40_CC40, XMC_CCU4_SLICE_EVENT_1, XMC_CCU4_SLICE_END_MODE_TIMER_STOP);
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XMC_CCU4_SLICE_StopConfig(CCU40_CC41, XMC_CCU4_SLICE_EVENT_1, XMC_CCU4_SLICE_END_MODE_TIMER_STOP);
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// Assign interrupt node and set priority
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XMC_CCU4_SLICE_SetInterruptNode(CCU40_CC41, XMC_CCU4_SLICE_IRQ_ID_COMPARE_MATCH_UP, XMC_CCU4_SLICE_SR_ID_0);
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NVIC_SetPriority(CCU40_0_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 63, 0));
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NVIC_EnableIRQ(CCU40_0_IRQn);
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// Enable clock to both slices
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XMC_CCU4_EnableClock(CCU40, (uint8_t)0);
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XMC_CCU4_EnableClock(CCU40, (uint8_t)1);
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}
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void TIMER_Start(uint32_t ticks)
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{
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XMC_CCU4_SLICE_SetTimerCompareMatch(CCU40_CC40, ticks & 0xffffU);
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XMC_CCU4_SLICE_SetTimerCompareMatch(CCU40_CC41, ticks >> 16U);
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XMC_CCU4_EnableShadowTransfer(CCU40, XMC_CCU4_SHADOW_TRANSFER_SLICE_0 | XMC_CCU4_SHADOW_TRANSFER_SLICE_1);
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XMC_CCU4_SLICE_EnableEvent(CCU40_CC41, XMC_CCU4_SLICE_IRQ_ID_COMPARE_MATCH_UP);
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/* Synchronous start of CCU4x timer slices */
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XMC_SCU_SetCcuTriggerHigh(XMC_SCU_CCU_TRIGGER_CCU40);
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}
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void TIMER_Stop(void)
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{
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XMC_CCU4_SLICE_DisableEvent(CCU40_CC41, XMC_CCU4_SLICE_IRQ_ID_COMPARE_MATCH_UP);
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/* Synchronous stop of CCU4x timer slices */
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XMC_SCU_SetCcuTriggerLow(XMC_SCU_CCU_TRIGGER_CCU40);
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}
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void TIMER_Clear()
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{
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XMC_CCU4_SLICE_ClearTimer(CCU40_CC40);
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XMC_CCU4_SLICE_ClearTimer(CCU40_CC41);
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}
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uint32_t TIMER_GetTime(void)
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{
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uint32_t time_h = XMC_CCU4_SLICE_GetTimerValue(CCU40_CC41);
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uint32_t time_l = XMC_CCU4_SLICE_GetTimerValue(CCU40_CC40);
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while (XMC_CCU4_SLICE_GetTimerValue(CCU40_CC41) != time_h)
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{
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time_h = XMC_CCU4_SLICE_GetTimerValue(CCU40_CC41);
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time_l = XMC_CCU4_SLICE_GetTimerValue(CCU40_CC40);
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}
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return ((time_h << 16) | time_l);
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}
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