222 lines
6.5 KiB
C
222 lines
6.5 KiB
C
/*
|
|
ChibiOS/HAL - Copyright (C) 2006-2014 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/*
|
|
This driver is based on the work done by Matteo Serva available at
|
|
http://github.com/matteoserva/ChibiOS-AVR
|
|
*/
|
|
|
|
/**
|
|
* @file AVR/gpt_lld.h
|
|
* @brief AVR GPT driver subsystem low level driver.
|
|
*
|
|
* @addtogroup GPT
|
|
* @{
|
|
*/
|
|
|
|
#ifndef _GPT_LLD_H_
|
|
#define _GPT_LLD_H_
|
|
|
|
#if HAL_USE_GPT || defined(__DOXYGEN__)
|
|
|
|
#include "avr_timers.h"
|
|
|
|
/*===========================================================================*/
|
|
/* Driver constants. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver pre-compile time settings. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief GPT1 driver enable switch.
|
|
* @details If set to @p TRUE the support for GPT1 is included.
|
|
* @note The default is @p FALSE.
|
|
*/
|
|
#if !defined(AVR_GPT_USE_TIM1)
|
|
#define AVR_GPT_USE_TIM1 FALSE
|
|
#endif
|
|
|
|
/**
|
|
* @brief GPT2 driver enable switch.
|
|
* @details If set to @p TRUE the support for GPT2 is included.
|
|
* @note The default is @p FALSE.
|
|
*/
|
|
#if !defined(AVR_GPT_USE_TIM2)
|
|
#define AVR_GPT_USE_TIM2 FALSE
|
|
#endif
|
|
|
|
/**
|
|
* @brief GPT3 driver enable switch.
|
|
* @details If set to @p TRUE the support for GPT3 is included.
|
|
* @note The default is @p FALSE.
|
|
*/
|
|
#if !defined(AVR_GPT_USE_TIM3)
|
|
#define AVR_GPT_USE_TIM3 FALSE
|
|
#endif
|
|
|
|
/**
|
|
* @brief GPT4 driver enable switch.
|
|
* @details If set to @p TRUE the support for GPT4 is included.
|
|
* @note The default is @p FALSE.
|
|
*/
|
|
#if !defined(AVR_GPT_USE_TIM4)
|
|
#define AVR_GPT_USE_TIM4 FALSE
|
|
#endif
|
|
|
|
/**
|
|
* @brief GPT5 driver enable switch.
|
|
* @details If set to @p TRUE the support for GPT5 is included.
|
|
* @note The default is @p FALSE.
|
|
*/
|
|
#if !defined(AVR_GPT_USE_TIM5)
|
|
#define AVR_GPT_USE_TIM5 FALSE
|
|
#endif
|
|
|
|
/*===========================================================================*/
|
|
/* Derived constants and error checks. */
|
|
/*===========================================================================*/
|
|
|
|
/*===========================================================================*/
|
|
/* Driver data structures and types. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief GPT frequency type.
|
|
*/
|
|
typedef uint32_t gptfreq_t;
|
|
|
|
/**
|
|
* @brief GPT counter type.
|
|
*/
|
|
typedef uint16_t gptcnt_t;
|
|
|
|
/**
|
|
* @brief Driver configuration structure.
|
|
* @note It could be empty on some architectures.
|
|
*/
|
|
typedef struct {
|
|
/**
|
|
* @brief Timer clock in Hz.
|
|
* @note The low level can use assertions in order to catch invalid
|
|
* frequency specifications.
|
|
*/
|
|
gptfreq_t frequency;
|
|
/**
|
|
* @brief Timer callback pointer.
|
|
* @note This callback is invoked on GPT counter events.
|
|
*/
|
|
gptcallback_t callback;
|
|
/* End of the mandatory fields.*/
|
|
} GPTConfig;
|
|
|
|
/**
|
|
* @brief Structure representing a GPT driver.
|
|
*/
|
|
struct GPTDriver {
|
|
/**
|
|
* @brief Driver state.
|
|
*/
|
|
volatile gptstate_t state;
|
|
/**
|
|
* @brief Current configuration data.
|
|
*/
|
|
const GPTConfig *config;
|
|
|
|
#if defined(GPT_DRIVER_EXT_FIELDS)
|
|
GPT_DRIVER_EXT_FIELDS
|
|
#endif
|
|
|
|
/* End of the mandatory fields.*/
|
|
/**
|
|
* @brief input clock from prescaler
|
|
*/
|
|
uint8_t clock_source;
|
|
/**
|
|
* @brief Lenght of the period in clock ticks
|
|
*/
|
|
gptcnt_t period;
|
|
/**
|
|
* @brief Current clock tick.
|
|
*/
|
|
gptcnt_t counter;
|
|
/**
|
|
* @brief Function called from the interrupt service routine
|
|
*/
|
|
gptcallback_t callback;
|
|
};
|
|
|
|
/*===========================================================================*/
|
|
/* Driver macros. */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Changes the interval of GPT peripheral.
|
|
* @details This function changes the interval of a running GPT unit.
|
|
* @pre The GPT unit must have been activated using @p gptStart().
|
|
* @pre The GPT unit must have been running in continuous mode using
|
|
* @p gptStartContinuous().
|
|
* @post The GPT unit interval is changed to the new value.
|
|
* @note The function has effect at the next cycle start.
|
|
*
|
|
* @param[in] gptp pointer to a @p GPTDriver object
|
|
* @param[in] interval new cycle time in timer ticks
|
|
* @notapi
|
|
*/
|
|
|
|
// FIXME: placeholder to enable compile, should be implemented!
|
|
#define gpt_lld_change_interval(gptp, interval)
|
|
|
|
/*===========================================================================*/
|
|
/* External declarations. */
|
|
/*===========================================================================*/
|
|
|
|
#if AVR_GPT_USE_TIM1 || defined(__DOXYGEN__)
|
|
extern GPTDriver GPTD1;
|
|
#endif
|
|
#if AVR_GPT_USE_TIM2 || defined(__DOXYGEN__)
|
|
extern GPTDriver GPTD2;
|
|
#endif
|
|
#if AVR_GPT_USE_TIM3 || defined(__DOXYGEN__)
|
|
extern GPTDriver GPTD3;
|
|
#endif
|
|
#if AVR_GPT_USE_TIM4 || defined(__DOXYGEN__)
|
|
extern GPTDriver GPTD4;
|
|
#endif
|
|
#if AVR_GPT_USE_TIM5 || defined(__DOXYGEN__)
|
|
extern GPTDriver GPTD5;
|
|
#endif
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
void gpt_lld_init(void);
|
|
void gpt_lld_start(GPTDriver *gptp);
|
|
void gpt_lld_stop(GPTDriver *gptp);
|
|
void gpt_lld_start_timer(GPTDriver *gptp, gptcnt_t interval);
|
|
void gpt_lld_stop_timer(GPTDriver *gptp);
|
|
void gpt_lld_polled_delay(GPTDriver *gptp, gptcnt_t interval);
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* HAL_USE_GPT */
|
|
|
|
#endif /* _GPT_LLD_H_ */
|
|
|
|
/** @} */
|