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This software, with or without modification, must only be used with a * Nordic Semiconductor ASA integrated circuit. * * 5. Any software provided in binary form under this license must not be reverse * engineered, decompiled, modified and/or disassembled. * * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef NRFX_COMP_H__ #define NRFX_COMP_H__ #include #include #ifdef __cplusplus extern "C" { #endif /** * @defgroup nrfx_comp COMP driver * @{ * @ingroup nrf_comp * @brief Comparator (COMP) peripheral driver. */ /** * @brief Macro to convert the threshold voltage to an integer value * (needed by the COMP_TH register). * * @param[in] vol Voltage to be changed to COMP_TH register value. This value * must not be smaller than reference voltage divided by 64. * @param[in] ref Reference voltage. */ #define NRFX_VOLTAGE_THRESHOLD_TO_INT(vol, ref) \ (uint8_t)(((vol) > ((ref) / 64)) ? (NRFX_ROUNDED_DIV((vol) * 64,(ref)) - 1) : 0) /** * @brief COMP event handler function type. * @param[in] event COMP event. */ typedef void (* nrfx_comp_event_handler_t)(nrf_comp_event_t event); /** @brief COMP shortcut masks. */ typedef enum { NRFX_COMP_SHORT_STOP_AFTER_CROSS_EVT = COMP_SHORTS_CROSS_STOP_Msk, /*!< Shortcut between the CROSS event and the STOP task. */ NRFX_COMP_SHORT_STOP_AFTER_UP_EVT = COMP_SHORTS_UP_STOP_Msk, /*!< Shortcut between the UP event and the STOP task. */ NRFX_COMP_SHORT_STOP_AFTER_DOWN_EVT = COMP_SHORTS_DOWN_STOP_Msk /*!< Shortcut between the DOWN event and the STOP task. */ } nrfx_comp_short_mask_t; /** @brief COMP events masks. */ typedef enum { NRFX_COMP_EVT_EN_CROSS_MASK = COMP_INTENSET_CROSS_Msk, /*!< CROSS event (generated after VIN+ == VIN-). */ NRFX_COMP_EVT_EN_UP_MASK = COMP_INTENSET_UP_Msk, /*!< UP event (generated when VIN+ crosses VIN- while increasing). */ NRFX_COMP_EVT_EN_DOWN_MASK = COMP_INTENSET_DOWN_Msk, /*!< DOWN event (generated when VIN+ crosses VIN- while decreasing). */ NRFX_COMP_EVT_EN_READY_MASK = COMP_INTENSET_READY_Msk /*!< READY event (generated when the module is ready). */ } nrfx_comp_evt_en_mask_t; /** @brief COMP configuration. */ typedef struct { nrf_comp_ref_t reference; /**< Reference selection. */ nrf_comp_ext_ref_t ext_ref; /**< External analog reference selection. */ nrf_comp_main_mode_t main_mode; /**< Main operation mode. */ nrf_comp_th_t threshold; /**< Structure holding THDOWN and THUP values needed by the COMP_TH register. */ nrf_comp_sp_mode_t speed_mode; /**< Speed and power mode. */ nrf_comp_hyst_t hyst; /**< Comparator hysteresis.*/ #if defined (COMP_ISOURCE_ISOURCE_Msk) || defined (__NRFX_DOXYGEN__) nrf_isource_t isource; /**< Current source selected on analog input. */ #endif nrf_comp_input_t input; /**< Input to be monitored. */ uint8_t interrupt_priority; /**< Interrupt priority. */ } nrfx_comp_config_t; /** @brief COMP threshold default configuration. */ #define NRFX_COMP_CONFIG_TH \ { \ .th_down = NRFX_VOLTAGE_THRESHOLD_TO_INT(0.5, 1.8), \ .th_up = NRFX_VOLTAGE_THRESHOLD_TO_INT(1.5, 1.8) \ } /** @brief COMP driver default configuration including the COMP HAL configuration. */ #if defined (COMP_ISOURCE_ISOURCE_Msk) || defined (__NRFX_DOXYGEN__) #define NRFX_COMP_DEFAULT_CONFIG(_input) \ { \ .reference = (nrf_comp_ref_t)NRFX_COMP_CONFIG_REF, \ .main_mode = (nrf_comp_main_mode_t)NRFX_COMP_CONFIG_MAIN_MODE, \ .threshold = NRFX_COMP_CONFIG_TH, \ .speed_mode = (nrf_comp_sp_mode_t)NRFX_COMP_CONFIG_SPEED_MODE, \ .hyst = (nrf_comp_hyst_t)NRFX_COMP_CONFIG_HYST, \ .isource = (nrf_isource_t)NRFX_COMP_CONFIG_ISOURCE, \ .input = (nrf_comp_input_t)_input, \ .interrupt_priority = NRFX_COMP_CONFIG_IRQ_PRIORITY \ } #else #define NRFX_COMP_DEFAULT_CONFIG(_input) \ { \ .reference = (nrf_comp_ref_t)NRFX_COMP_CONFIG_REF, \ .main_mode = (nrf_comp_main_mode_t)NRFX_COMP_CONFIG_MAIN_MODE, \ .threshold = NRFX_COMP_CONFIG_TH, \ .speed_mode = (nrf_comp_sp_mode_t)NRFX_COMP_CONFIG_SPEED_MODE, \ .hyst = (nrf_comp_hyst_t)NRFX_COMP_CONFIG_HYST, \ .input = (nrf_comp_input_t)_input, \ .interrupt_priority = NRFX_COMP_CONFIG_IRQ_PRIORITY \ } #endif /** * @brief Function for initializing the COMP driver. * * This function initializes the COMP driver, but does not enable the peripheral or any interrupts. * To start the driver, call the function @ref nrfx_comp_start() after initialization. * * @param[in] p_config Pointer to the structure with initial configuration. * @param[in] event_handler Event handler provided by the user. * Must not be NULL. * * @retval NRFX_SUCCESS If initialization was successful. * @retval NRFX_ERROR_INVALID_STATE If the driver has already been initialized. * @retval NRFX_ERROR_BUSY If the LPCOMP peripheral is already in use. * This is possible only if @ref nrfx_prs module * is enabled. */ nrfx_err_t nrfx_comp_init(nrfx_comp_config_t const * p_config, nrfx_comp_event_handler_t event_handler); /** * @brief Function for uninitializing the COMP driver. * * This function uninitializes the COMP driver. The COMP peripheral and * its interrupts are disabled, and local variables are cleaned. After this call, you must * initialize the driver again by calling nrfx_comp_init() if you want to use it. * * @sa nrfx_comp_stop() */ void nrfx_comp_uninit(void); /** * @brief Function for setting the analog input. * * @param[in] psel COMP analog pin selection. */ void nrfx_comp_pin_select(nrf_comp_input_t psel); /** * @brief Function for starting the COMP peripheral and interrupts. * * Before calling this function, the driver must be initialized. This function * enables the COMP peripheral and its interrupts. * * @param[in] comp_evt_en_mask Mask of events to be enabled. This parameter should be built as * 'or' of elements from @ref nrfx_comp_evt_en_mask_t. * @param[in] comp_shorts_mask Mask of shorts to be enabled. This parameter should be built as * 'or' of elements from @ref nrfx_comp_short_mask_t. * * @sa nrfx_comp_init() * */ void nrfx_comp_start(uint32_t comp_evt_en_mask, uint32_t comp_shorts_mask); /**@brief Function for stopping the COMP peripheral. * * Before calling this function, the driver must be enabled. This function disables the COMP * peripheral and its interrupts. * * @sa nrfx_comp_uninit() * */ void nrfx_comp_stop(void); /** * @brief Function for copying the current state of the comparator result to the RESULT register. * * @retval 0 If the input voltage is below the threshold (VIN+ < VIN-). * @retval 1 If the input voltage is above the threshold (VIN+ > VIN-). */ uint32_t nrfx_comp_sample(void); /** * @brief Function for getting the address of a COMP task. * * @param[in] task COMP task. * * @return Address of the given COMP task. */ __STATIC_INLINE uint32_t nrfx_comp_task_address_get(nrf_comp_task_t task) { return (uint32_t)nrf_comp_task_address_get(task); } /** * @brief Function for getting the address of a COMP event. * * @param[in] event COMP event. * * @return Address of the given COMP event. */ __STATIC_INLINE uint32_t nrfx_comp_event_address_get(nrf_comp_event_t event) { return (uint32_t)nrf_comp_event_address_get(event); } void nrfx_comp_irq_handler(void); /** @} **/ #ifdef __cplusplus } #endif #endif // NRFX_COMP_H__