171 lines
5.7 KiB
C
171 lines
5.7 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_epit
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//! @{
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/*!
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* @file epit.h
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* @brief EPIT driver public interface.
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*/
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#ifndef __EPIT_H__
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#define __EPIT_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 Free running reload mode.
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//!
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//! When the counter reaches zero it rolls over to 0xFFFF_FFFF.
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#define FREE_RUNNING 0
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//! @brief Set and forget reload mode.
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//!
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//! When the counter reaches zero it reloads from the modulus register.
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#define SET_AND_FORGET 1
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//! @brief Pass to epit_counter_enable() to enable interrupts.
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#define IRQ_MODE 1
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//! @brief Get the irq id of RPIT by instance number.
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//! @param x I2C instance number, from 1 through 2.
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#define EPIT_IRQS(x) ( (x) == HW_EPIT1 ? IMX_INT_EPIT1 : (x) == HW_EPIT2 ? IMX_INT_EPIT2 : 0xFFFFFFFF)
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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 EPIT timer.
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*
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* @param instance the EPIT instance number.
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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.
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* @param prescaler Prescaler of source clock from 1 to 4096.
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* @param reload_mode Counter reload mode: FREE_RUNNING or SET_AND_FORGET.
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* @param load_val Load value from where the counter start.
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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 epit_init(uint32_t instance, uint32_t clock_src, uint32_t prescaler,
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uint32_t reload_mode, uint32_t load_val, uint32_t low_power_mode);
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/*!
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* @brief Setup EPIT interrupt.
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*
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* It enables or disables the related HW module interrupt, and attached the related sub-routine
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* into the vector table.
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*
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* @param instance the EPIT instance number.
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* @param irq_subroutine the EPIT interrupt interrupt routine.
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* @param enableIt True to enable the interrupt, false to disable.
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*/
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void epit_setup_interrupt(uint32_t instance, void (*irq_subroutine)(void), bool enableIt);
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/*!
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* @brief Enable the EPIT module.
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*
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* Used typically when the epit_init is done, and other interrupt related settings are ready.
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*
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* In interrupt mode, when the interrupt fires you should call epit_get_compare_event() to
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* clear the compare flag.
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*
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* @param instance the EPIT instance number.
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* @param load_val Load value from where the counter starts.
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* @param irq_mode Interrupt mode: IRQ_MODE or POLLING_MODE.
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*/
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void epit_counter_enable(uint32_t instance, uint32_t load_val, 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 energy when not used.
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*
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* @param instance the EPIT instance number.
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*/
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void epit_counter_disable(uint32_t instance);
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/*!
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* @brief Get the output compare status 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 instance the EPIT instance number.
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* @return Value of the compare event flag.
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*/
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uint32_t epit_get_compare_event(uint32_t instance);
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/*!
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* @brief Set the output compare register.
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*
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*
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* @param instance the EPIT instance number.
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* @param Value of the compare register.
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*/
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void epit_set_compare_event(uint32_t instance, uint32_t compare_val);
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/*!
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* @brief Get the counter value.
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*
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*
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* @param instance the EPIT instance number.
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* @return Value of the counter register.
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*/
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uint32_t epit_get_counter_value(uint32_t instance);
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/*!
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* @brief Reload the counter with a known value.
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*
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* @param instance the EPIT instance number.
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* @param load_val Value loaded into the timer counter.
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*/
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void epit_reload_counter(uint32_t instance, uint32_t load_val);
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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 //__EPIT_H__
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////////////////////////////////////////////////////////////////////////////////
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// EOF
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////////////////////////////////////////////////////////////////////////////////
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