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/*
ChibiOS/RT - Copyright (C) 2006-2013 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.
*/
/**
* @file LPC122x/gpt_lld.h
* @brief LPC122x GPT subsystem low level driver header.
*
* @addtogroup GPT
* @{
*/
#ifndef _GPT_LLD_H_
#define _GPT_LLD_H_
#if HAL_USE_GPT || defined(__DOXYGEN__)
/*===========================================================================*/
/* 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 TRUE.
*/
#if !defined(LPC122x_GPT_USE_CT16B0) || defined(__DOXYGEN__)
#define LPC122x_GPT_USE_CT16B0 TRUE
#endif
/**
* @brief GPT2 driver enable switch.
* @details If set to @p TRUE the support for GPT2 is included.
* @note The default is @p TRUE.
*/
#if !defined(LPC122x_GPT_USE_CT16B1) || defined(__DOXYGEN__)
#define LPC122x_GPT_USE_CT16B1 TRUE
#endif
/**
* @brief GPT3 driver enable switch.
* @details If set to @p TRUE the support for GPT3 is included.
* @note The default is @p TRUE.
*/
#if !defined(LPC122x_GPT_USE_CT32B0) || defined(__DOXYGEN__)
#define LPC122x_GPT_USE_CT32B0 TRUE
#endif
/**
* @brief GPT4 driver enable switch.
* @details If set to @p TRUE the support for GPT4 is included.
* @note The default is @p TRUE.
*/
#if !defined(LPC122x_GPT_USE_CT32B1) || defined(__DOXYGEN__)
#define LPC122x_GPT_USE_CT32B1 TRUE
#endif
/**
* @brief GPT1 interrupt priority level setting.
*/
#if !defined(LPC122x_GPT_CT16B0_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC122x_GPT_CT16B0_IRQ_PRIORITY 2
#endif
/**
* @brief GPT2 interrupt priority level setting.
*/
#if !defined(LPC122x_GPT_CT16B1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC122x_GPT_CT16B1_IRQ_PRIORITY 2
#endif
/**
* @brief GPT3 interrupt priority level setting.
*/
#if !defined(LPC122x_GPT_CT32B0_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC122x_GPT_CT32B0_IRQ_PRIORITY 2
#endif
/**
* @brief GPT4 interrupt priority level setting.
*/
#if !defined(LPC122x_GPT_CT32B1_IRQ_PRIORITY) || defined(__DOXYGEN__)
#define LPC122x_GPT_CT32B1_IRQ_PRIORITY 2
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if !LPC122x_GPT_USE_CT16B0 && !LPC122x_GPT_USE_CT16B1 && \
!LPC122x_GPT_USE_CT32B0 && !LPC122x_GPT_USE_CT32B1
#error "GPT driver activated but no CT peripheral assigned"
#endif
/*===========================================================================*/
/* Driver data structures and types. */
/*===========================================================================*/
/**
* @brief GPT frequency type.
*/
typedef uint32_t gptfreq_t;
/**
* @brief GPT counter type.
*/
typedef uint32_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.
*/
gptstate_t state;
/**
* @brief Current configuration data.
*/
const GPTConfig *config;
/* End of the mandatory fields.*/
/**
* @brief Pointer to the CTxxBy registers block.
*/
LPC_CTxxBx_Type *tmr;
};
/*===========================================================================*/
/* Driver macros. */
/*===========================================================================*/
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#if LPC122x_GPT_USE_CT16B0 && !defined(__DOXYGEN__)
extern GPTDriver GPTD1;
#endif
#if LPC122x_GPT_USE_CT16B1 && !defined(__DOXYGEN__)
extern GPTDriver GPTD2;
#endif
#if LPC122x_GPT_USE_CT32B0 && !defined(__DOXYGEN__)
extern GPTDriver GPTD3;
#endif
#if LPC122x_GPT_USE_CT32B1 && !defined(__DOXYGEN__)
extern GPTDriver GPTD4;
#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 period);
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_ */
/** @} */
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