mirror of https://github.com/ARMmbed/mbed-os.git
477 lines
20 KiB
C
477 lines
20 KiB
C
/**
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* @file
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* @brief Real-Time Clock data types, definitions and function prototypes.
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*/
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/* ****************************************************************************
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* Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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* $Date: 2017-02-16 12:04:19 -0600 (Thu, 16 Feb 2017) $
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* $Revision: 26465 $
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*
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**************************************************************************** */
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/* Define to prevent redundant inclusion */
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#ifndef _RTC_H_
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#define _RTC_H_
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/* **** Includes **** */
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#include "mxc_config.h"
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#include "rtc_regs.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @ingroup periphlibs
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* @defgroup rtc Real-Time Clock (RTC)
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* @brief Functions, types, and registers for the Real-Time Clock Peripheral.
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* @{
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*/
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/* **** Definitions **** */
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/**
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* Enumeration type for scaling down the 4096Hz input clock to the RTC.
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*/
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typedef enum {
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RTC_PRESCALE_DIV_2_0 = MXC_V_RTC_PRESCALE_DIV_2_0, /**< \f$ f_{RTC} = \frac {4096} {2^{0}} = 4096Hz \f$ */
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RTC_PRESCALE_DIV_2_1 = MXC_V_RTC_PRESCALE_DIV_2_1, /**< \f$ f_{RTC} = \frac {4096} {2^{1}} = 2048Hz \f$ */
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RTC_PRESCALE_DIV_2_2 = MXC_V_RTC_PRESCALE_DIV_2_2, /**< \f$ f_{RTC} = \frac {4096} {2^{2}} = 1024Hz \f$ */
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RTC_PRESCALE_DIV_2_3 = MXC_V_RTC_PRESCALE_DIV_2_3, /**< \f$ f_{RTC} = \frac {4096} {2^{3}} = 512Hz \f$ */
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RTC_PRESCALE_DIV_2_4 = MXC_V_RTC_PRESCALE_DIV_2_4, /**< \f$ f_{RTC} = \frac {4096} {2^{4}} = 256Hz \f$ */
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RTC_PRESCALE_DIV_2_5 = MXC_V_RTC_PRESCALE_DIV_2_5, /**< \f$ f_{RTC} = \frac {4096} {2^{5}} = 128Hz \f$ */
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RTC_PRESCALE_DIV_2_6 = MXC_V_RTC_PRESCALE_DIV_2_6, /**< \f$ f_{RTC} = \frac {4096} {2^{6}} = 64Hz \f$ */
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RTC_PRESCALE_DIV_2_7 = MXC_V_RTC_PRESCALE_DIV_2_7, /**< \f$ f_{RTC} = \frac {4096} {2^{7}} = 32Hz \f$ */
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RTC_PRESCALE_DIV_2_8 = MXC_V_RTC_PRESCALE_DIV_2_8, /**< \f$ f_{RTC} = \frac {4096} {2^{8}} = 16Hz \f$ */
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RTC_PRESCALE_DIV_2_9 = MXC_V_RTC_PRESCALE_DIV_2_9, /**< \f$ f_{RTC} = \frac {4096} {2^{9}} = 8Hz \f$ */
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RTC_PRESCALE_DIV_2_10 = MXC_V_RTC_PRESCALE_DIV_2_10, /**< \f$ f_{RTC} = \frac {4096} {2^{10}} = 4Hz \f$ */
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RTC_PRESCALE_DIV_2_11 = MXC_V_RTC_PRESCALE_DIV_2_11, /**< \f$ f_{RTC} = \frac {4096} {2^{11}} = 2Hz \f$ */
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RTC_PRESCALE_DIV_2_12 = MXC_V_RTC_PRESCALE_DIV_2_12, /**< \f$ f_{RTC} = \frac {4096} {2^{12}} = 1Hz \f$ */
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} rtc_prescale_t;
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/**
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* Mask of the RTC Flags for the Active Transaction.
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*/
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#define RTC_CTRL_ACTIVE_TRANS (MXC_F_RTC_CTRL_RTC_ENABLE_ACTIVE | \
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MXC_F_RTC_CTRL_OSC_GOTO_LOW_ACTIVE | \
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MXC_F_RTC_CTRL_OSC_FRCE_SM_EN_ACTIVE | \
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MXC_F_RTC_CTRL_OSC_FRCE_ST_ACTIVE | \
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MXC_F_RTC_CTRL_RTC_SET_ACTIVE | \
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MXC_F_RTC_CTRL_RTC_CLR_ACTIVE | \
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MXC_F_RTC_CTRL_ROLLOVER_CLR_ACTIVE | \
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MXC_F_RTC_CTRL_PRESCALE_CMPR0_ACTIVE | \
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MXC_F_RTC_CTRL_PRESCALE_UPDATE_ACTIVE | \
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MXC_F_RTC_CTRL_CMPR1_CLR_ACTIVE | \
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MXC_F_RTC_CTRL_CMPR0_CLR_ACTIVE | \
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MXC_F_RTC_CTRL_TRIM_ENABLE_ACTIVE | \
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MXC_F_RTC_CTRL_TRIM_SLOWER_ACTIVE | \
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MXC_F_RTC_CTRL_TRIM_CLR_ACTIVE | \
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MXC_F_RTC_CTRL_ACTIVE_TRANS_0)
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/**
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* Mask used to clear all RTC interrupt flags, see \ref RTC_FLAGS_Register Register.
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*/
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#define RTC_FLAGS_CLEAR_ALL (MXC_F_RTC_FLAGS_COMP0 | \
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MXC_F_RTC_FLAGS_COMP1| \
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MXC_F_RTC_FLAGS_PRESCALE_COMP | \
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MXC_F_RTC_FLAGS_OVERFLOW | \
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MXC_F_RTC_FLAGS_TRIM)
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/**
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* Enumeration type to select the type of RTC Snooze Mode for an alarm condition.
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*/
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typedef enum {
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RTC_SNOOZE_DISABLE = MXC_V_RTC_CTRL_SNOOZE_DISABLE, /**< Snooze Mode Disabled */
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RTC_SNOOZE_MODE_A = MXC_V_RTC_CTRL_SNOOZE_MODE_A, /**< \f$ COMP1 = COMP1 + RTC\_SNZ\_VALUE \f$ when snooze flag is set */
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RTC_SNOOZE_MODE_B = MXC_V_RTC_CTRL_SNOOZE_MODE_B, /**< \f$ COMP1 = RTC\_TIMER + RTC\_SNZ\_VALUE \f$ when snooze flag is set */
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} rtc_snooze_t;
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/**
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* Number of RTC Compare registers for this peripheral instance.
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*/
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#define RTC_NUM_COMPARE 2
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/**
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* Structure type that represents the current configuration of the RTC.
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*/
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typedef struct {
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rtc_prescale_t prescaler; /**< prescale value for the input 4096Hz clock. */
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rtc_prescale_t prescalerMask; /**< Mask value used to compare to the rtc prescale value, when the \f$ (Count_{prescaler}\,\&\,Prescale\,Mask) == 0 \f$, the prescale compare flag will be set. */
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uint32_t compareCount[RTC_NUM_COMPARE]; /**< Values used for setting the RTC alarms. See RTC_SetCompare(uint8_t compareIndex, uint32_t counts) and RTC_GetCompare(). */
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uint32_t snoozeCount; /**< The number of RTC ticks to snooze if enabled. */
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rtc_snooze_t snoozeMode; /**< The desired snooze mode, see #rtc_snooze_t. */
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} rtc_cfg_t;
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/**
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* @brief Initializes the RTC
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* @note Must setup clocking and power prior to this function.
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*
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* @param cfg RTC configuration object.
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*
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* @retval #E_NO_ERROR RTC initialized successfully.
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* @retval #E_NULL_PTR \p cfg pointer is NULL.
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* @retval #E_INVALID if comparison index, prescaler mask or snooze mask
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* are out of bounds, see #rtc_cfg_t.
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*/
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int RTC_Init(const rtc_cfg_t *cfg);
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/**
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* @brief Enable and start the real-time clock continuing from its current value.
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*/
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__STATIC_INLINE void RTC_Start(void)
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{
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MXC_RTCTMR->ctrl |= MXC_F_RTC_CTRL_ENABLE;
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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/**
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* @brief Disable and stop the real-time clock counting.
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*/
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__STATIC_INLINE void RTC_Stop(void)
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{
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MXC_RTCTMR->ctrl &= ~(MXC_F_RTC_CTRL_ENABLE);
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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/**
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* @brief Returns the state (running or disabled) for the RTC.
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*
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* @retval 0 Disabled.
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* @retval Non-zero Active.
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*/
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__STATIC_INLINE uint32_t RTC_IsActive(void)
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{
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return (MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_ENABLE);
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}
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/**
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* @brief Set the current count of the RTC
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*
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* @param count The desired count value to set for the RTC count.
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*/
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__STATIC_INLINE void RTC_SetCount(uint32_t count)
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{
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MXC_RTCTMR->timer = count;
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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/**
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* @brief Get the current count value of the RTC.
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*
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* @retval The value of the RTC counter.
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*/
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__STATIC_INLINE uint32_t RTC_GetCount(void)
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{
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return (MXC_RTCTMR->timer);
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}
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/**
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* @brief Sets the compare value for the RTC.
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*
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* @param compareIndex Index of comparator to set, see #RTC_NUM_COMPARE
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* for the total number of compare registers
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* available.
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* @param counts The value to set for the compare.
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* @retval #E_NO_ERROR Compare count register set successfully for
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* requested comparator.
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* @retval #E_INVALID compareIndex is @>= RTC_NUM_COMPARE.
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*/
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int RTC_SetCompare(uint8_t compareIndex, uint32_t counts);
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/**
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* @brief Gets the compare value for the RTC.
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*
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* @param compareIndex Index of the compare value to return. See #RTC_NUM_COMPARE
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* for the total number of compare registers available.
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*
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* @returns The current value of the specified compare register for the RTC.
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*/
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uint32_t RTC_GetCompare(uint8_t compareIndex);
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/**
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* @brief Set the prescale reload value for the real-time clock.
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* @details The prescale reload value determines the number of 4kHz ticks
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* that will occur before the timer is incremented.
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* <table>
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* <caption id="prescaler_val">Prescaler Settings and Corresponding RTC Resolutions</caption>
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* <tr><th>PRESCALE <th>Prescale Reload <th>4kHz ticks in LSB <th>Min Timer Value (sec) <th> Max Timer Value (sec) <th>Max Timer Value (Days) <th> Max Timer Value (Years)
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* <tr><td align="right">0h<td align="center">RTC_PRESCALE_DIV_2_0<td align="right">1<td align="right">0.00024<td align="right">1048576<td align="right">12<td align="right">0.0
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* <tr><td align="right">1h<td align="center">RTC_PRESCALE_DIV_2_1<td align="right">2<td align="right">0.00049<td align="right">2097152<td align="right">24<td align="right">0.1
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* <tr><td align="right">2h<td align="center">RTC_PRESCALE_DIV_2_2<td align="right">4<td align="right">0.00098<td align="right">4194304<td align="right">49<td align="right">0.1
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* <tr><td align="right">3h<td align="center">RTC_PRESCALE_DIV_2_3<td align="right">8<td align="right">0.00195<td align="right">8388608<td align="right">97<td align="right">0.3
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* <tr><td align="right">4h<td align="center">RTC_PRESCALE_DIV_2_4<td align="right">16<td align="right">0.00391<td align="right">16777216<td align="right">194 <td align="right">0.5
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* <tr><td align="right">5h<td align="center">RTC_PRESCALE_DIV_2_5<td align="right">32<td align="right">0.00781<td align="right">33554432<td align="right">388 <td align="right">1.1
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* <tr><td align="right">6h<td align="center">RTC_PRESCALE_DIV_2_6<td align="right">64<td align="right">0.01563<td align="right">67108864<td align="right">777 <td align="right">2.2
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* <tr><td align="right">7h<td align="center">RTC_PRESCALE_DIV_2_7<td align="right">128<td align="right">0.03125<td align="right">134217728<td align="right">1553 <td align="right">4.4
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* <tr><td align="right">8h<td align="center">RTC_PRESCALE_DIV_2_8<td align="right">256<td align="right">0.06250<td align="right">268435456<td align="right">3107 <td align="right">8.7
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* <tr><td align="right">9h<td align="center">RTC_PRESCALE_DIV_2_9<td align="right">512<td align="right">0.12500<td align="right">536870912<td align="right">6214 <td align="right">17.5
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* <tr><td align="right">Ah<td align="center">RTC_PRESCALE_DIV_2_10<td align="right">1024 <td align="right">0.25000<td align="right">1073741824<td align="right">12428<td align="right">34.9
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* <tr><td align="right">Bh<td align="center">RTC_PRESCALE_DIV_2_11<td align="right">2048 <td align="right">0.50000<td align="right">2147483648<td align="right">24855<td align="right">69.8
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* <tr><td align="right">Ch<td align="center">RTC_PRESCALE_DIV_2_12<td align="right">4096 <td align="right">1.00000<td align="right">4294967296<td align="right">49710<td align="right">139.6
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* </table>
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*
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* @param prescaler Prescale value to set, see #rtc_prescale_t.
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*/
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__STATIC_INLINE void RTC_SetPrescaler(rtc_prescale_t prescaler)
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{
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MXC_RTCTMR->prescale = prescaler;
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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/**
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* @brief Get the current value of the real-time clock prescaler.
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*
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* @retval rtc_prescale_t Returns the current RTC prescaler setting,
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* See #rtc_prescale_t for values of the prescaler.
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*/
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__STATIC_INLINE rtc_prescale_t RTC_GetPrescaler(void)
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{
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return (rtc_prescale_t)(MXC_RTCTMR->prescale);
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}
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/**
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* @brief Set the prescaler mask, which is used to set the RTC prescale counter
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* compare flag when the prescaler timer matches the bits indicated
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* by the mask.
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* @param mask A bit mask that is used to set the prescale compare flag if the
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* prescale timer has the corresponding bits set. @note This mask must
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* be less than or equal to the prescaler reload value.
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* See RTC_SetPrescaler()
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* @details When \f$ Count_{prescaler}\,\&\,Prescale\,Mask = 0 \f$, the prescale compare flag is set
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* @retval int Returns #E_NO_ERROR if prescale value is valid and is set.
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* @retval int Returns #E_INVALID if mask is \> than prescaler value
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*/
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__STATIC_INLINE int RTC_SetPrescalerMask(rtc_prescale_t mask)
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{
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if (mask > ((rtc_prescale_t)(MXC_RTCTMR->prescale)))
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{
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return E_INVALID;
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}
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MXC_RTCTMR->prescale_mask = mask;
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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return E_NO_ERROR;
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}
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/**
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* @brief Set the count for snooze mode. See RTC_Snooze().
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* @details This value is used to set the snooze count. The meaning of this value is dependant on the snooze mode. p
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* See RTC_SetSnoozeMode() for details of calculating the snooze time period based on the mode and snooze count.
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* @param count Sets the count used for snooze when snooze mode is
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* enabled and the snooze flag is set.
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* @retval #E_NO_ERROR Snooze value is set correctly and value is valid.
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* @retval #E_INVALID SnoozeCount exceeds maximum supported, see
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* MXC_F_RTC_SNZ_VAL_VALUE
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*/
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__STATIC_INLINE int RTC_SetSnoozeCount(uint32_t count)
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{
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// Check to make sure max value is not being exceeded
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if (count > MXC_F_RTC_SNZ_VAL_VALUE)
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return E_INVALID;
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MXC_RTCTMR->snz_val = count;
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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return E_NO_ERROR;
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}
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/**
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* @brief Gets the current Snooze Count value.
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* @details Returns the current value for the Snooze Count. This value is
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* used as part of the snooze calculation depending on the snooze
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* mode. See RTC_SetSnoozeMode() for details of calculating the
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* snooze time period based on the mode and count.
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* @return Value of the snooze register.
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*/
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__STATIC_INLINE uint32_t RTC_GetSnoozeCount(void)
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{
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return MXC_RTCTMR->snz_val;
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}
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/**
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* @brief Activates snooze mode.
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* @details Begins a snooze of the RTC. When this function is called
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* the snooze time period is determined based on the snooze mode and the count.
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* See RTC_GetCount() and RTC_SetSnoozeMode()
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*/
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__STATIC_INLINE void RTC_Snooze(void)
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{
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MXC_RTCTMR->flags = MXC_F_RTC_FLAGS_SNOOZE_A | MXC_F_RTC_FLAGS_SNOOZE_B;
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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/**
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* @brief Sets the Snooze Mode.
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* @details <table> <caption id="snoozeModesTable">Snooze Modes</caption>
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* <tr><th>Mode<th>Snooze Time Calculation
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* <tr><td>RTC_SNOOZE_DISABLE<td>Snooze Disabled
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* <tr><td>RTC_SNOOZE_MODE_A<td>\f$ compare1 = compare1 + snoozeCount \f$
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* <tr><td>RTC_SNOOZE_MODE_B<td>\f$ compare1 = count + snoozeCount \f$
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* </table>
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* @note @a count is the value of the RTC counter when RTC_Snooze()
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* is called to start a snooze cycle and @a snoozeCount is the value set by the RTC_SetSnoozeCount(uint32_t count) function.
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*
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* @param mode Specifies the desired snooze mode, see #rtc_snooze_t.
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*
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*/
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__STATIC_INLINE void RTC_SetSnoozeMode(rtc_snooze_t mode)
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{
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uint32_t ctrl;
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// Get the control register and mask off the non-snooze bits
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ctrl = (MXC_RTCTMR->ctrl & ~(MXC_F_RTC_CTRL_SNOOZE_ENABLE));
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// set the requested snooze mode bits and save the settings
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MXC_RTCTMR->ctrl = (ctrl | (mode << MXC_F_RTC_CTRL_SNOOZE_ENABLE_POS));
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//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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/**
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* @brief Enables the interrupts specified for the RTC.
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* @details <table>
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* <caption id="RTC_interrupts">RTC Interrupts</caption>
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* <tr><th>Interrupt<th>Mask
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* <tr><td>Compare 0<td>#MXC_F_RTC_INTEN_COMP0
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* <tr><td>Compare 1 and Snooze<td>#MXC_F_RTC_INTEN_COMP1
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* <tr><td>Prescale Comp<td>#MXC_F_RTC_INTEN_PRESCALE_COMP
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* <tr><td>RTC Count Overflow<td>#MXC_F_RTC_INTEN_OVERFLOW
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* <tr><td>Trim<td>#MXC_F_RTC_INTEN_TRIM
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* </table>
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* @param mask A mask of the RTC interrupts to enable, 1 = Enable. See
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* @ref RTC_FLAGS_Register Register for the RTC interrupt enable bit masks and positions.
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*/
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__STATIC_INLINE void RTC_EnableINT(uint32_t mask)
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{
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MXC_RTCTMR->inten |= mask;
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}
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/**
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* @brief Disable the interrupts specified for the RTC. See the
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* @ref RTC_INTEN_Register Register for the RTC interrupt enable bit masks and positions.
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*
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* @param mask A mask of the RTC interrupts to disable, 1 = Disable.
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*/
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__STATIC_INLINE void RTC_DisableINT(uint32_t mask)
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{
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MXC_RTCTMR->inten &= ~mask;
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}
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/**
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* @brief Returns the current interrupt flags that are set.
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*
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* @return A mask of the current interrupt flags, see the
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* @ref RTC_FLAGS_Register Register for the details of the RTC interrupt
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* flags.
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*/
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__STATIC_INLINE uint32_t RTC_GetFlags(void)
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{
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return (MXC_RTCTMR->flags);
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}
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|
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/**
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* @brief Clears the interrupt flags specified.
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*
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* @param mask A mask of interrupts to clear, see the @ref RTC_FLAGS_Register
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* Register for the interrupt flag bit masks and positions.
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*/
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__STATIC_INLINE void RTC_ClearFlags(uint32_t mask)
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|
{
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|
MXC_RTCTMR->flags = mask;
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|
|
|
//wait for pending actions to complete
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while(MXC_RTCTMR->ctrl & MXC_F_RTC_CTRL_PENDING);
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}
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|
|
|
/**
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|
* @brief Gets the active transaction flags, see @ref RTC_CTRL_Register Register for the list of ACTIVE flags.
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*
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* @retval 0 No active transactions.
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|
* @retval nonzero A mask of active transaction bits.
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|
*/
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|
__STATIC_INLINE uint32_t RTC_GetActiveTrans(void)
|
|
{
|
|
return (MXC_RTCTMR->ctrl & RTC_CTRL_ACTIVE_TRANS);
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|
}
|
|
|
|
/**
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|
* @brief Sets the trim value and trim slow/fast option.
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|
* @warning The RTC must be disabled prior to calling this function, see RTC_Stop(void) to disable the RTC.
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|
*
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|
* @param trim The desired trim value. @note The maximum trim value setting is 0x03FFFF.
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|
* @param trimSlow 1 = trim slow, 0 = trim fast
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|
*
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|
* @return #E_NO_ERROR Trim value is valid and set.
|
|
* @return #E_INVALID Trim value exceeds max trim.
|
|
* @return #E_BAD_STATE RTC is active.
|
|
*/
|
|
int RTC_SetTrim(uint32_t trim, uint8_t trimSlow);
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|
|
|
/**
|
|
* @brief Gets the current trim value.
|
|
* @note Ensure RTC is disabled prior to calling this function, see RTC_Stop(void).
|
|
*
|
|
* @retval uint32_t Current trim value of RTC.
|
|
*/
|
|
uint32_t RTC_GetTrim(void);
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|
|
|
/**
|
|
* @brief Enable the trim.
|
|
* @warning The RTC must be disabled prior to calling this function, see RTC_Stop(void) to disable the RTC.
|
|
* @retval #E_NO_ERROR Trim is enabled.
|
|
* @retval #E_INVALID RTC is active, see RTC_Stop(void).
|
|
*/
|
|
int RTC_TrimEnable(void);
|
|
|
|
/**
|
|
* @brief Disable the trim.
|
|
*/
|
|
void RTC_TrimDisable(void);
|
|
|
|
/**@}*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* _RTC_H */
|