225 lines
8.6 KiB
C
225 lines
8.6 KiB
C
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/*
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* Copyright (c) 2011-2012, Freescale Semiconductor, Inc.
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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 modification,
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* are permitted provided that the following conditions are met:
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*
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* o Redistributions of source code must retain the above copyright notice, this list
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* of conditions and the following disclaimer.
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*
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* o Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* o Neither the name of Freescale Semiconductor, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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//! @addtogroup diag_gpt
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//! @{
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/*!
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* @file gpt.h
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* @brief GPT driver public interface.
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*/
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#ifndef __GPT_H__
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#define __GPT_H__
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#include "imx_timer.h"
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#include "sdk.h"
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////////////////////////////////////////////////////////////////////////////////
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// Definitions
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////////////////////////////////////////////////////////////////////////////////
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//! @brief Possible events for the GPT.
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//!
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//! These constants are intended to be combined together to form a bitmask. Several
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//! of the GPT driver APIs use such a bitmask. For instance, gpt_counter_enable()
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//! accepts a bitmask that selects the events for which interrupts should be enabled.
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//!
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//! Note that the values of these enums happen to be the bitmasks for the respective
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//! fields in the HW_GPT_SR and HW_GPT_IR registers, so a mask constructed from them
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//! can be used directly with register values.
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enum _gpt_events
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{
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kGPTNoEvent = 0, //!< No events enabled.
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kGPTRollover = 1 << 5, //!< Rollover event.
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kGPTInputCapture1 = 1 << 3, //!< Input capture 1 event.
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kGPTInputCapture2 = 1 << 4, //!< Input capture 2 event.
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kGPTOutputCompare1 = 1 << 0, //!< Output compare 1 event.
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kGPTOutputCompare2 = 1 << 1, //!< Output compare 2 event.
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kGPTOutputCompare3 = 1 << 2, //!< Output compare 3 event.
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//! Combined mask of all GPT events.
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kGPTAllEvents = kGPTRollover | kGPTInputCapture1 | kGPTInputCapture2
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| kGPTOutputCompare1 | kGPTOutputCompare2 | kGPTOutputCompare3
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};
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//! @brief GPT counter modes.
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enum _gpt_counter_mode
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{
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RESTART_MODE = 0,
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FREE_RUN_MODE = 1
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};
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//! @brief Supported input capture modes.
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enum _gpt_capture_modes
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{
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INPUT_CAP_DISABLE = 0, //!< input capture event disabled
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INPUT_CAP_RISING_EDGE = 1, //!< input capture event on a rising edge
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INPUT_CAP_FALLING_EDGE = 2, //!< input capture event on a falling edge
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INPUT_CAP_BOTH_EDGE = 3 //!< input capture event on a both edge
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};
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//! @brief Supported output modes.
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enum _gpt_compare_modes
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{
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OUTPUT_CMP_DISABLE = 0, //!< output disconnected from pad
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OUTPUT_CMP_TOGGLE = 1, //!< output toggle mode
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OUTPUT_CMP_CLEAR = 2, //!< output set low mode
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OUTPUT_CMP_SET = 3, //!< output set high mode
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OUTPUT_CMP_LOWPULSE = 4 //!< output set high mode
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};
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////////////////////////////////////////////////////////////////////////////////
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// API
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////////////////////////////////////////////////////////////////////////////////
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*!
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* @brief Initialize the GPT timer.
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*
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* @param clock_src Source clock of the counter: CLKSRC_OFF, CLKSRC_IPG_CLK,
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* CLKSRC_PER_CLK, CLKSRC_CKIL, CLKSRC_CLKIN.
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* @param prescaler Prescaler of the source clock from 1 to 4096.
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* @param counter_mode Counter mode: FREE_RUN_MODE or RESTART_MODE.
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* @param low_power_mode Low power during which the timer is enabled:
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* WAIT_MODE_EN and/or STOP_MODE_EN.
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*/
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void gpt_init(uint32_t clock_src, uint32_t prescaler, uint32_t counter_mode, uint32_t low_power_mode);
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/*!
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* @brief Setup GPT interrupt.
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*
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* It enables or disables the related HW module interrupt, and attached the
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* related sub-routine into the vector table.
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*
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* @param irq_subroutine the GPT interrupt interrupt routine.
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* @param enableIt Pass true to enable the interrupt.
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*/
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void gpt_setup_interrupt(void (*irq_subroutine)(void), bool enableIt);
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/*!
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* @brief Enable the GPT module.
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*
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* Used typically when the gpt_init is done, and other interrupt related settings are ready.
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*
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* If a value of #kGPTNoEvent is passed for @a irq_mode, then no interrupts will be enabled.
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* This effectively puts the timer into polling mode, where you must call gpt_get_x_event()
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* to check for an event having occurred.
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*
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* @param irq_mode Mask of events to enable interrupts for, such as #kGPTRollover or
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* #kGPTOutputCompare1. See the #_gpt_events enum for the complete list. Pass
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* #kGPTNoEvent to prevent any interrupts from being enabled, which effectively puts
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* the timer into polling mode.
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*/
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void gpt_counter_enable(uint32_t irq_mode);
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/*!
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* @brief Disable the counter.
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*
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* It saves power when not used.
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*
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*/
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void gpt_counter_disable(void);
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/*!
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* @brief Get rollover event flag and clear it if set.
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*
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* This function can typically be used for polling method, but
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* is also used to clear the status compare flag in IRQ mode.
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*
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* @return Either 0 of kGPTRollover.
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*/
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uint32_t gpt_get_rollover_event(void);
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/*!
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* @brief Get a captured value when an event occured, and clear the flag if set.
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*
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* Use this function to check for an input capture event having occurred, either in
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* the event ISR or to check manually in polling mode. Pass the input channel to check
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* in the @a flag parameter. If that channel fired, its captured timer value will be
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* read and placed in @a capture_val (if not NULL). The event that fired will be cleared
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* and its event mask returned as the return value from the function. If no event
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* occurred, the function returns 0.
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*
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* @param flag Which channel to check, either #kGPTInputCapture1 or #kGPTInputCapture2.
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* Only one channel may be specified.
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* @param capture_val The capture register value is returned through this parameter if
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* the specified event occurred. May be NULL if not required.
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* @return Mask of input specified capture event that occurred, or 0 if no event occurred.
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*/
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uint32_t gpt_get_capture_event(uint8_t flag, uint32_t * capture_val);
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/*!
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* @brief Set the input capture mode.
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*
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* @param cap_input The input capture channel to configure, either #kGPTInputCapture1
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* or #kGPTInputCapture2.
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* @param cap_input_mode Capture input mode: #INPUT_CAP_DISABLE, #INPUT_CAP_BOTH_EDGE,
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* #INPUT_CAP_FALLING_EDGE, #INPUT_CAP_RISING_EDGE.
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*/
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void gpt_set_capture_event(uint8_t cap_input, uint8_t cap_input_mode);
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/*!
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* @brief Get a compare event flag and clear it if set.
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*
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* This function can typically be used for polling method, but
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* is also used to clear the status compare flag in IRQ mode.
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*
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* @param flag Checked compare event flag such GPTSR_OF1, GPTSR_OF2, GPTSR_OF3.
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* @return The value of the compare event flag.
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*/
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uint32_t gpt_get_compare_event(uint8_t flag);
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/*!
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* @brief Set a compare event by programming the compare register and
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* compare output mode.
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*
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* @param cmp_output The channel to configure. Must be one of #kGPTOutputCompare1,
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* #kGPTOutputCompare2, or #kGPTOutputCompare3.
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* @param cmp_output_mode Compare output mode: #OUTPUT_CMP_DISABLE, #OUTPUT_CMP_TOGGLE,
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* #OUTPUT_CMP_CLEAR, #OUTPUT_CMP_SET, #OUTPUT_CMP_LOWPULSE.
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* @param cmp_value Compare value for the compare register.
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*/
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void gpt_set_compare_event(uint8_t cmp_output, uint8_t cmp_output_mode, uint32_t cmp_value);
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#if defined(__cplusplus)
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}
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#endif
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//! @}
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#endif //__GPT_H__
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////////////////////////////////////////////////////////////////////////////////
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// EOF
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////////////////////////////////////////////////////////////////////////////////
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