279 lines
7.0 KiB
C
279 lines
7.0 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* @file LPC8xx/gpt_lld.c
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* @brief LPC8xx GPT subsystem low level driver source.
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*
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* @addtogroup GPT
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* @{
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*/
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#include "ch.h"
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#include "hal.h"
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#if HAL_USE_GPT || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver exported variables. */
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/*===========================================================================*/
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/**
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* @brief GPT1 driver identifier.
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* @note The driver GPT1 allocates MRT channel0 when enabled.
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*/
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#if LPC8xx_GPT_USE_MRT0 || defined(__DOXYGEN__)
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GPTDriver GPTD1;
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#endif
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/**
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* @brief GPT2 driver identifier.
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* @note The driver GPT1 allocates MRT channel1 when enabled.
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*/
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#if LPC8xx_GPT_USE_MRT1 || defined(__DOXYGEN__)
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GPTDriver GPTD2;
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#endif
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/**
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* @brief GPT3 driver identifier.
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* @note The driver GPT1 allocates MRT channel2 when enabled.
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*/
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#if LPC8xx_GPT_USE_MRT2 || defined(__DOXYGEN__)
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GPTDriver GPTD3;
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#endif
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/**
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* @brief GPT4 driver identifier.
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* @note The driver GPT1 allocates MRT channel3 when enabled.
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*/
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#if LPC8xx_GPT_USE_MRT3 || defined(__DOXYGEN__)
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GPTDriver GPTD4;
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#endif
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/*===========================================================================*/
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/* Driver local variables. */
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/*===========================================================================*/
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static uint32_t clk_enabled;
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/*===========================================================================*/
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/* Driver local functions. */
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/*===========================================================================*/
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/**
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* @brief Shared IRQ handler.
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*
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* @param[in] gptp pointer to a @p GPTDriver object
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* @param[in] irq_flag irq flag bit
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*/
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static void gpt_lld_serve_interrupt( GPTDriver *gptp ) {
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if (gptp->tmr->STAT & 0x01) {
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gptp->tmr->STAT |= 0x01;
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if (gptp->state == GPT_ONESHOT) {
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gptp->state = GPT_READY; /* Back in GPT_READY state. */
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}
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gptp->config->callback(gptp);
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}
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return;
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}
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/*===========================================================================*/
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/* Driver interrupt handlers. */
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/*===========================================================================*/
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/**
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* @brief MRT IRQ handler.
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*
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*/
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CH_IRQ_HANDLER(Vector68) {
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CH_IRQ_PROLOGUE();
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#if LPC8xx_GPT_USE_MRT0
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gpt_lld_serve_interrupt( &GPTD1 );
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#endif
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#if LPC8xx_GPT_USE_MRT1
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gpt_lld_serve_interrupt( &GPTD2 );
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#endif
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#if LPC8xx_GPT_USE_MRT2
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gpt_lld_serve_interrupt( &GPTD3 );
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#endif
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#if LPC8xx_GPT_USE_MRT3
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gpt_lld_serve_interrupt( &GPTD4 );
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#endif
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CH_IRQ_EPILOGUE();
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}
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/*===========================================================================*/
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/* Driver exported functions. */
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/*===========================================================================*/
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/**
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* @brief Low level GPT driver initialization.
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*
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* @notapi
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*/
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void gpt_lld_init(void) {
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#if LPC8xx_GPT_USE_MRT0
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GPTD1.tmr = &(LPC_MRT->Channel[0]);
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gptObjectInit(&GPTD1);
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GPTD1.mask = (1<<0);
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#endif
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#if LPC8xx_GPT_USE_MRT1
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GPTD2.tmr = &(LPC_MRT->Channel[1]);
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gptObjectInit(&GPTD2);
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GPTD1.mask = (1<<1);
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#endif
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#if LPC8xx_GPT_USE_MRT2
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GPTD3.tmr = &(LPC_MRT->Channel[2]);
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gptObjectInit(&GPTD3);
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GPTD1.mask = (1<<2);
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#endif
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#if LPC8xx_GPT_USE_MRT3
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GPTD4.tmr = &(LPC_MRT->Channel[3]);
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gptObjectInit(&GPTD4);
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GPTD1.mask = (1<<3);
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#endif
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clk_enabled = FALSE;
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return;
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}
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/**
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* @brief Configures and activates a GPT channel.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_start(GPTDriver *gptp) {
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if( !clk_enabled ) {
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/* Enable clock & reset MRT */
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LPC_SYSCON->SYSAHBCLKCTRL |= (1<<10);
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LPC_SYSCON->PRESETCTRL &= ~(1<<7);
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LPC_SYSCON->PRESETCTRL |= (1<<7);
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nvicEnableVector(MRT_IRQn,
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CORTEX_PRIORITY_MASK(LPC8xx_GPT_MRT_IRQ_PRIORITY));
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clk_enabled |= gptp->mask;
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}
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/* Prescaler value calculation.*/
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gptp->pr = (LPC8xx_SYSCLK / gptp->config->frequency);
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chDbgAssert((gptp->pr * gptp->config->frequency) == LPC8xx_SYSCLK,
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"gpt_lld_start(), #1", "invalid frequency");
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/* MRT Channel configuration.*/
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gptp->tmr->CTRL = 0;
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gptp->tmr->STAT |= 1;
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}
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/**
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* @brief Deactivates a GPT channel.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_stop(GPTDriver *gptp) {
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/* Shared peripheral -
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mark this channel as disabled */
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clk_enabled &= ~gptp->mask;
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/* All channels disabled? */
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if( !clk_enabled )
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{
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/* Disable periheral */
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nvicDisableVector(MRT_IRQn);
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LPC_SYSCON->SYSAHBCLKCTRL &= ~(1<<10);
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}
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return;
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}
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/**
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* @brief Starts the timer in continuous/One shot mode.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval period in ticks
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*
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* @notapi
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*/
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void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t interval) {
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gptp->tmr->INTVAL = (1<<31)|((interval*gptp->pr) - 1);
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if (gptp->state == GPT_ONESHOT)
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gptp->tmr->CTRL = (1<<1)|1;
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else
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gptp->tmr->CTRL = 1;
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}
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/**
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* @brief Stops the timer.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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*
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* @notapi
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*/
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void gpt_lld_stop_timer(GPTDriver *gptp) {
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gptp->tmr->INTVAL = (1<<31);
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gptp->tmr->CTRL = 0;
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gptp->tmr->STAT |= 1;
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}
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/**
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* @brief Starts the timer in one shot mode and waits for completion.
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* @details This function specifically polls the timer waiting for completion
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* in order to not have extra delays caused by interrupt servicing,
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* this function is only recommended for short delays.
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*
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* @param[in] gptp pointer to the @p GPTDriver object
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* @param[in] interval time interval in ticks
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*
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* @notapi
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*/
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void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval) {
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gptp->tmr->INTVAL = (1<<31)|((interval*gptp->pr) - 1);
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gptp->tmr->CTRL = (1<<1);
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while (gptp->tmr->STAT & (1<<1))
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;
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gptp->tmr->CTRL = 0;
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gptp->tmr->STAT |= 1;
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}
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#endif /* HAL_USE_GPT */
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/** @} */
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