209 lines
6.3 KiB
C
209 lines
6.3 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.h
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* @brief LPC8xx GPT subsystem low level driver header.
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*
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* @addtogroup GPT
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* @{
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*/
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#ifndef _GPT_LLD_H_
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#define _GPT_LLD_H_
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#if HAL_USE_GPT || defined(__DOXYGEN__)
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/*===========================================================================*/
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/* Driver constants. */
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/*===========================================================================*/
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/*===========================================================================*/
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/* Driver pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @brief GPT1 driver enable switch.
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* @details If set to @p TRUE the support for GPT1 is included.
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* @note The default is @p TRUE.
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*/
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#if !defined(LPC8xx_GPT_USE_MRT0) || defined(__DOXYGEN__)
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#define LPC8xx_GPT_USE_MRT0 TRUE
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#endif
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/**
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* @brief GPT2 driver enable switch.
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* @details If set to @p TRUE the support for GPT2 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(LPC8xx_GPT_USE_MRT1) || defined(__DOXYGEN__)
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#define LPC8xx_GPT_USE_MRT1 FALSE
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#endif
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/**
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* @brief GPT3 driver enable switch.
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* @details If set to @p TRUE the support for GPT3 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(LPC8xx_GPT_USE_MRT2) || defined(__DOXYGEN__)
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#define LPC8xx_GPT_USE_MRT2 FALSE
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#endif
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/**
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* @brief GPT4 driver enable switch.
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* @details If set to @p TRUE the support for GPT4 is included.
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* @note The default is @p FALSE.
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*/
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#if !defined(LPC8xx_GPT_USE_MRT3) || defined(__DOXYGEN__)
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#define LPC8xx_GPT_USE_MRT3 FALSE
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#endif
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/**
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* @brief GPT interrupt priority level setting.
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*/
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#if !defined(LPC8xx_GPT_MRT_IRQ_PRIORITY) || defined(__DOXYGEN__)
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#define LPC8xx_GPT_MRT_IRQ_PRIORITY 2
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#endif
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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#if !LPC8xx_GPT_USE_MRT0 && !LPC8xx_GPT_USE_MRT1 && \
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!LPC8xx_GPT_USE_MRT2 && !LPC8xx_GPT_USE_MRT3
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#error "GPT driver activated but no CT peripheral assigned"
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#endif
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/*===========================================================================*/
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/* Driver data structures and types. */
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/*===========================================================================*/
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/**
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* @brief GPT frequency type.
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*/
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typedef uint32_t gptfreq_t;
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/**
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* @brief GPT counter type.
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*/
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typedef uint32_t gptcnt_t;
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/**
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* @brief Driver configuration structure.
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* @note It could be empty on some architectures.
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*/
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typedef struct {
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/**
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* @brief Timer clock in Hz.
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* @note The low level can use assertions in order to catch invalid
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* frequency specifications.
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*/
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gptfreq_t frequency;
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/**
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* @brief Timer callback pointer.
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* @note This callback is invoked on GPT counter events.
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*/
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gptcallback_t callback;
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/* End of the mandatory fields.*/
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} GPTConfig;
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/**
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* @brief Structure representing a GPT driver.
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*/
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struct GPTDriver {
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/**
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* @brief Driver state.
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*/
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gptstate_t state;
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/**
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* @brief Current configuration data.
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*/
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const GPTConfig *config;
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/* End of the mandatory fields.*/
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/**
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* @brief Pointer to the MRT Channelx registers block.
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*/
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MRT_Channel_cfg_Type *tmr;
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/**
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* @brief Prescaler.
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*/
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uint32_t pr;
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/**
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* @brief channel bitmask.
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*/
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uint32_t mask;
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};
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/*===========================================================================*/
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/* Driver macros. */
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/*===========================================================================*/
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/**
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* @brief Changes the interval of GPT peripheral.
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* @details This function changes the interval of a running GPT unit.
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* @pre The GPT unit must have been activated using @p gptStart().
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* @pre The GPT unit must have been running in continuous mode using
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* @p gptStartContinuous().
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* @post The GPT unit interval is changed to the new value.
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* @note The function has effect at the next cycle start.
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*
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* @param[in] gptp pointer to a @p GPTDriver object
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* @param[in] interval new cycle time in timer ticks
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* @notapi
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*/
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#define gpt_lld_change_interval(gptp, interval) \
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((gptp)->tmr->INTVAL = ((interval*(gptp)->pr) - 1))
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#if LPC8xx_GPT_USE_MRT0 && !defined(__DOXYGEN__)
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extern GPTDriver GPTD1;
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#endif
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#if LPC8xx_GPT_USE_MRT1 && !defined(__DOXYGEN__)
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extern GPTDriver GPTD2;
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#endif
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#if LPC8xx_GPT_USE_MRT2 && !defined(__DOXYGEN__)
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extern GPTDriver GPTD3;
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#endif
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#if LPC8xx_GPT_USE_MRT3 && !defined(__DOXYGEN__)
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extern GPTDriver GPTD4;
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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void gpt_lld_init(void);
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void gpt_lld_start(GPTDriver *gptp);
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void gpt_lld_stop(GPTDriver *gptp);
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void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t period);
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void gpt_lld_stop_timer(GPTDriver *gptp);
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void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval);
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#ifdef __cplusplus
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}
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#endif
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#endif /* HAL_USE_GPT */
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#endif /* _GPT_LLD_H_ */
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/** @} */
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