diff options
Diffstat (limited to 'drivers/fsl_lptmr.h')
| -rw-r--r-- | drivers/fsl_lptmr.h | 82 |
1 files changed, 41 insertions, 41 deletions
diff --git a/drivers/fsl_lptmr.h b/drivers/fsl_lptmr.h index d022cbb..6cc909b 100644 --- a/drivers/fsl_lptmr.h +++ b/drivers/fsl_lptmr.h @@ -1,6 +1,6 @@ /* - * Copyright (c) 2015, Freescale Semiconductor, Inc. - * All rights reserved. + * Copyright (c) 2016, Freescale Semiconductor, Inc. + * Copyright 2016-2017 NXP * * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: @@ -12,7 +12,7 @@ * list of conditions and the following disclaimer in the documentation and/or * other materials provided with the distribution. * - * o Neither the name of Freescale Semiconductor, Inc. nor the names of its + * o Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * @@ -37,17 +37,16 @@ * @{ */ - /******************************************************************************* * Definitions ******************************************************************************/ /*! @name Driver version */ /*@{*/ -#define FSL_LPTMR_DRIVER_VERSION (MAKE_VERSION(2, 0, 0)) /*!< Version 2.0.0 */ +#define FSL_LPTMR_DRIVER_VERSION (MAKE_VERSION(2, 0, 1)) /*!< Version 2.0.1 */ /*@}*/ -/*! @brief LPTMR pin selection, used in pulse counter mode.*/ +/*! @brief LPTMR pin selection used in pulse counter mode.*/ typedef enum _lptmr_pin_select { kLPTMR_PinSelectInput_0 = 0x0U, /*!< Pulse counter input 0 is selected */ @@ -56,7 +55,7 @@ typedef enum _lptmr_pin_select kLPTMR_PinSelectInput_3 = 0x3U /*!< Pulse counter input 3 is selected */ } lptmr_pin_select_t; -/*! @brief LPTMR pin polarity, used in pulse counter mode.*/ +/*! @brief LPTMR pin polarity used in pulse counter mode.*/ typedef enum _lptmr_pin_polarity { kLPTMR_PinPolarityActiveHigh = 0x0U, /*!< Pulse Counter input source is active-high */ @@ -103,13 +102,13 @@ typedef enum _lptmr_prescaler_clock_select kLPTMR_PrescalerClock_3 = 0x3U, /*!< Prescaler/glitch filter clock 3 selected. */ } lptmr_prescaler_clock_select_t; -/*! @brief List of LPTMR interrupts */ +/*! @brief List of the LPTMR interrupts */ typedef enum _lptmr_interrupt_enable { kLPTMR_TimerInterruptEnable = LPTMR_CSR_TIE_MASK, /*!< Timer interrupt enable */ } lptmr_interrupt_enable_t; -/*! @brief List of LPTMR status flags */ +/*! @brief List of the LPTMR status flags */ typedef enum _lptmr_status_flags { kLPTMR_TimerCompareFlag = LPTMR_CSR_TCF_MASK, /*!< Timer compare flag */ @@ -120,18 +119,18 @@ typedef enum _lptmr_status_flags * * This structure holds the configuration settings for the LPTMR peripheral. To initialize this * structure to reasonable defaults, call the LPTMR_GetDefaultConfig() function and pass a - * pointer to your config structure instance. + * pointer to your configuration structure instance. * - * The config struct can be made const so it resides in flash + * The configuration struct can be made constant so it resides in flash. */ typedef struct _lptmr_config { lptmr_timer_mode_t timerMode; /*!< Time counter mode or pulse counter mode */ lptmr_pin_select_t pinSelect; /*!< LPTMR pulse input pin select; used only in pulse counter mode */ lptmr_pin_polarity_t pinPolarity; /*!< LPTMR pulse input pin polarity; used only in pulse counter mode */ - bool enableFreeRunning; /*!< true: enable free running, counter is reset on overflow - false: counter is reset when the compare flag is set */ - bool bypassPrescaler; /*!< true: bypass prescaler; false: use clock from prescaler */ + bool enableFreeRunning; /*!< True: enable free running, counter is reset on overflow + False: counter is reset when the compare flag is set */ + bool bypassPrescaler; /*!< True: bypass prescaler; false: use clock from prescaler */ lptmr_prescaler_clock_select_t prescalerClockSource; /*!< LPTMR clock source */ lptmr_prescaler_glitch_value_t value; /*!< Prescaler or glitch filter value */ } lptmr_config_t; @@ -150,26 +149,26 @@ extern "C" { */ /*! - * @brief Ungate the LPTMR clock and configures the peripheral for basic operation. + * @brief Ungates the LPTMR clock and configures the peripheral for a basic operation. * * @note This API should be called at the beginning of the application using the LPTMR driver. * * @param base LPTMR peripheral base address - * @param config Pointer to user's LPTMR config structure. + * @param config A pointer to the LPTMR configuration structure. */ void LPTMR_Init(LPTMR_Type *base, const lptmr_config_t *config); /*! - * @brief Gate the LPTMR clock + * @brief Gates the LPTMR clock. * * @param base LPTMR peripheral base address */ void LPTMR_Deinit(LPTMR_Type *base); /*! - * @brief Fill in the LPTMR config struct with the default settings + * @brief Fills in the LPTMR configuration structure with default settings. * - * The default values are: + * The default values are as follows. * @code * config->timerMode = kLPTMR_TimerModeTimeCounter; * config->pinSelect = kLPTMR_PinSelectInput_0; @@ -179,7 +178,7 @@ void LPTMR_Deinit(LPTMR_Type *base); * config->prescalerClockSource = kLPTMR_PrescalerClock_1; * config->value = kLPTMR_Prescale_Glitch_0; * @endcode - * @param config Pointer to user's LPTMR config structure. + * @param config A pointer to the LPTMR configuration structure. */ void LPTMR_GetDefaultConfig(lptmr_config_t *config); @@ -212,7 +211,7 @@ static inline void LPTMR_EnableInterrupts(LPTMR_Type *base, uint32_t mask) * * @param base LPTMR peripheral base address * @param mask The interrupts to disable. This is a logical OR of members of the - * enumeration ::lptmr_interrupt_enable_t + * enumeration ::lptmr_interrupt_enable_t. */ static inline void LPTMR_DisableInterrupts(LPTMR_Type *base, uint32_t mask) { @@ -245,7 +244,7 @@ static inline uint32_t LPTMR_GetEnabledInterrupts(LPTMR_Type *base) */ /*! - * @brief Gets the LPTMR status flags + * @brief Gets the LPTMR status flags. * * @param base LPTMR peripheral base address * @@ -258,11 +257,11 @@ static inline uint32_t LPTMR_GetStatusFlags(LPTMR_Type *base) } /*! - * @brief Clears the LPTMR status flags + * @brief Clears the LPTMR status flags. * * @param base LPTMR peripheral base address * @param mask The status flags to clear. This is a logical OR of members of the - * enumeration ::lptmr_status_flags_t + * enumeration ::lptmr_status_flags_t. */ static inline void LPTMR_ClearStatusFlags(LPTMR_Type *base, uint32_t mask) { @@ -272,47 +271,48 @@ static inline void LPTMR_ClearStatusFlags(LPTMR_Type *base, uint32_t mask) /*! @}*/ /*! - * @name Read and Write the timer period + * @name Read and write the timer period * @{ */ /*! * @brief Sets the timer period in units of count. * - * Timers counts from 0 till it equals the count value set here. The count value is written to + * Timers counts from 0 until it equals the count value set here. The count value is written to * the CMR register. * * @note * 1. The TCF flag is set with the CNR equals the count provided here and then increments. - * 2. User can call the utility macros provided in fsl_common.h to convert to ticks + * 2. Call the utility macros provided in the fsl_common.h to convert to ticks. * * @param base LPTMR peripheral base address - * @param ticks Timer period in units of ticks + * @param ticks A timer period in units of ticks, which should be equal or greater than 1. */ -static inline void LPTMR_SetTimerPeriod(LPTMR_Type *base, uint16_t ticks) +static inline void LPTMR_SetTimerPeriod(LPTMR_Type *base, uint32_t ticks) { - base->CMR = ticks; + assert(ticks > 0); + base->CMR = ticks - 1; } /*! * @brief Reads the current timer counting value. * - * This function returns the real-time timer counting value, in a range from 0 to a + * This function returns the real-time timer counting value in a range from 0 to a * timer period. * - * @note User can call the utility macros provided in fsl_common.h to convert ticks to usec or msec + * @note Call the utility macros provided in the fsl_common.h to convert ticks to usec or msec. * * @param base LPTMR peripheral base address * - * @return Current counter value in ticks + * @return The current counter value in ticks */ -static inline uint16_t LPTMR_GetCurrentTimerCount(LPTMR_Type *base) +static inline uint32_t LPTMR_GetCurrentTimerCount(LPTMR_Type *base) { /* Must first write any value to the CNR. This synchronizes and registers the current value * of the CNR into a temporary register which can then be read */ base->CNR = 0U; - return (uint16_t)base->CNR; + return (uint32_t)((base->CNR & LPTMR_CNR_COUNTER_MASK) >> LPTMR_CNR_COUNTER_SHIFT); } /*! @}*/ @@ -323,10 +323,10 @@ static inline uint16_t LPTMR_GetCurrentTimerCount(LPTMR_Type *base) */ /*! - * @brief Starts the timer counting. + * @brief Starts the timer. * * After calling this function, the timer counts up to the CMR register value. - * Each time the timer reaches CMR value and then increments, it generates a + * Each time the timer reaches the CMR value and then increments, it generates a * trigger pulse and sets the timeout interrupt flag. An interrupt is also * triggered if the timer interrupt is enabled. * @@ -336,16 +336,16 @@ static inline void LPTMR_StartTimer(LPTMR_Type *base) { uint32_t reg = base->CSR; - /* Clear the TCF bit so that we don't clear this w1c bit when writing back */ + /* Clear the TCF bit to avoid clearing the w1c bit when writing back. */ reg &= ~(LPTMR_CSR_TCF_MASK); reg |= LPTMR_CSR_TEN_MASK; base->CSR = reg; } /*! - * @brief Stops the timer counting. + * @brief Stops the timer. * - * This function stops the timer counting and resets the timer's counter register + * This function stops the timer and resets the timer's counter register. * * @param base LPTMR peripheral base address */ @@ -353,7 +353,7 @@ static inline void LPTMR_StopTimer(LPTMR_Type *base) { uint32_t reg = base->CSR; - /* Clear the TCF bit so that we don't clear this w1c bit when writing back */ + /* Clear the TCF bit to avoid clearing the w1c bit when writing back. */ reg &= ~(LPTMR_CSR_TCF_MASK); reg &= ~LPTMR_CSR_TEN_MASK; base->CSR = reg; |