267 lines
12 KiB
C
267 lines
12 KiB
C
/**
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* Copyright (c) 2012 - 2019, Nordic Semiconductor ASA
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form, except as embedded into a Nordic
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* Semiconductor ASA integrated circuit in a product or a software update for
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* such product, must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* 4. This software, with or without modification, must only be used with a
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* Nordic Semiconductor ASA integrated circuit.
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*
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* 5. Any software provided in binary form under this license must not be reverse
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* engineered, decompiled, modified and/or disassembled.
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*
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* THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/** @file
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*
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* @defgroup app_gpiote GPIOTE Handler
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* @{
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* @ingroup app_common
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*
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* @brief GPIOTE handler module.
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*
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* @details The GPIOTE handler allows several modules ("users") to share the GPIOTE interrupt,
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* each user defining a set of pins able to generate events to the user.
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* When a GPIOTE interrupt occurs, the GPIOTE interrupt handler will call the event handler
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* of each user for which at least one of the pins generated an event.
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*
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* The GPIOTE users are responsible for configuring all their corresponding pins, except
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* the SENSE field, which should be initialized to GPIO_PIN_CNF_SENSE_Disabled.
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* The SENSE field will be updated by the GPIOTE module when it is enabled or disabled,
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* and also while it is enabled.
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*
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* The module specifies on which pins events should be generated if the pin(s) goes
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* from low->high or high->low or both directions.
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*
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* @note Even if the application is using the @ref app_scheduler, the GPIOTE event handlers will
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* be called directly from the GPIOTE interrupt handler.
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*
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* @warning If multiple users registers for the same pins the behavior for those pins are undefined.
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*/
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#ifndef APP_GPIOTE_H__
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#define APP_GPIOTE_H__
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#include <stdint.h>
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#include <stdbool.h>
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#include "nrf.h"
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#include "nrf_drv_gpiote.h"
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#include "app_error.h"
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#include "app_util.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define GPIOTE_USER_NODE_SIZE ((4*sizeof(uint32_t)*GPIO_COUNT)+8) /**< Size of app_gpiote.gpiote_user_t (only for use inside APP_GPIOTE_BUF_SIZE()). */
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/**@brief Compute number of bytes required to hold the GPIOTE data structures.
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*
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* @param[in] MAX_USERS Maximum number of GPIOTE users.
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*
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* @retval Required buffer size (in bytes).
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*/
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#define APP_GPIOTE_BUF_SIZE(MAX_USERS) ((MAX_USERS) * GPIOTE_USER_NODE_SIZE)
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typedef uint8_t app_gpiote_user_id_t;
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/**@brief GPIOTE event handler type. */
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typedef void (*app_gpiote_event_handler_t)(uint32_t const * p_event_pins_low_to_high,
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uint32_t const * p_event_pins_high_to_low);
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/**@brief GPIOTE input event handler type. */
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typedef void (*app_gpiote_input_event_handler_t)(void);
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/* Make the pin config descriptor packed */
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#pragma pack(push, 1)
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/**
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* @brief Single pin configuration
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*
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* Structure used to describe single pin configuration
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* when registering user.
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* @sa app_gpiote_user_register_ex
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*/
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typedef struct
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{
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/** Pin number to observe */
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uint32_t pin_number : VBITS(NRF_GPIO_PIN_MAP(GPIO_COUNT - 1, 31));
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/** Transition to observe */
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nrf_gpiote_polarity_t sense : 2;
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} app_gpiote_user_pin_config_t;
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// Check if we can fitt all the nrf_gpiote_polarity_t values into 2 bits field
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STATIC_ASSERT(NRF_GPIOTE_POLARITY_LOTOHI <= 3);
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STATIC_ASSERT(NRF_GPIOTE_POLARITY_HITOLO <= 3);
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STATIC_ASSERT(NRF_GPIOTE_POLARITY_TOGGLE <= 3);
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#pragma pack(pop)
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/**@brief Macro for initializing the GPIOTE module.
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*
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* @details It will handle dimensioning and allocation of the memory buffer required by the module,
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* making sure that the buffer is correctly aligned.
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*
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* @param[in] MAX_USERS Maximum number of GPIOTE users.
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*
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* @note Since this macro allocates a buffer, it must only be called once (it is OK to call it
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* several times as long as it is from the same location, e.g. to do a reinitialization).
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*/
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/*lint -emacro(506, APP_GPIOTE_INIT) */ /* Suppress "Constant value Boolean */
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#define APP_GPIOTE_INIT(MAX_USERS) \
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do \
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{ \
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static uint32_t app_gpiote_buf[CEIL_DIV(APP_GPIOTE_BUF_SIZE(MAX_USERS), sizeof(uint32_t))];\
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uint32_t ERR_CODE = app_gpiote_init((MAX_USERS), app_gpiote_buf); \
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APP_ERROR_CHECK(ERR_CODE); \
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} while (0)
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/**@brief Function for initializing the GPIOTE module.
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*
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* @note Normally initialization should be done using the APP_GPIOTE_INIT() macro, as that will
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* allocate the buffer needed by the GPIOTE module (including aligning the buffer correctly).
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*
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* @param[in] max_users Maximum number of GPIOTE users.
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* @param[in] p_buffer Pointer to memory buffer for internal use in the app_gpiote
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* module. The size of the buffer can be computed using the
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* APP_GPIOTE_BUF_SIZE() macro. The buffer must be aligned to
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* a 4 byte boundary.
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*
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* @retval NRF_SUCCESS Successful initialization.
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* @retval NRF_ERROR_INVALID_PARAM Invalid parameter (buffer not aligned to a 4 byte
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* boundary).
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*/
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uint32_t app_gpiote_init(uint8_t max_users, void * p_buffer);
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/**@brief Function for registering a GPIOTE user.
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*
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* @param[out] p_user_id Id for the new GPIOTE user.
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* @param[in] p_pins_low_to_high_mask Pointer to word array with mask defining which pins
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* will generate events to this user when state is changed
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* from low->high. Size of array depends on number of ports
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* in the device.
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* @param[in] p_pins_high_to_low_mask Pointer to word array with mask defining which pins
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* will generate events to this user when state is changed
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* from high->low. Size of array depends on number of ports
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* in the device.
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* @param[in] event_handler Pointer to function to be executed when an event occurs.
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* Cannot be NULL.
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*
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* @retval NRF_SUCCESS Successful initialization.
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* @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE
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* module.
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* @retval NRF_ERROR_NO_MEM Returned if the application tries to register more users
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* than defined when the GPIOTE module was initialized in
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* @ref app_gpiote_init.
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*
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* @note The function can also return error codes from internally
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* called @ref nrf_drv_gpiote_in_init
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*
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* @sa app_gpiote_user_register_ex
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*/
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uint32_t app_gpiote_user_register(app_gpiote_user_id_t * p_user_id,
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uint32_t const * p_pins_low_to_high_mask,
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uint32_t const * p_pins_high_to_low_mask,
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app_gpiote_event_handler_t event_handler);
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/**@brief Function for registering GPIOTE user using pins configuration list.
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*
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* Function for registering GPIOTE user that uses array of pins configuration.
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* This function do not change pins configuration.
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* Pins must be configured before calling this function.
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*
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* @param[out] p_user_id Id for the new GPIOTE user.
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* @param[in] p_pins_config Pointer to the array of pins configuration for the user.
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* @param[in] pin_count Number of pins to configure for the user.
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* @param[in] event_handler Pointer to function to be executed when an event occurs.
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* Cannot be NULL.
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*
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* @retval NRF_SUCCESS Successful user registration.
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* @retval NRF_ERROR_INVALID_STATE If @ref app_gpiote_init has not been called before calling
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* this function.
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* @retval NRF_ERROR_NO_MEM Returned if the application tries to register more users
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* than defined when the GPIOTE module was initialized in
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* @ref app_gpiote_init.
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*
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* @note The function can also return error codes from internally
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* called @ref nrf_drv_gpiote_in_init
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*
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* @sa app_gpiote_user_register
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*/
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uint32_t app_gpiote_user_register_ex(app_gpiote_user_id_t * p_user_id,
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app_gpiote_user_pin_config_t const * p_pins_config,
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size_t pin_count,
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app_gpiote_event_handler_t event_handler);
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/**@brief Function for informing the GPIOTE module that the specified user wants to use the GPIOTE module.
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*
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* @param[in] user_id Id of user to enable.
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*
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* @retval NRF_SUCCESS On success.
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* @retval NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user.
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* @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE
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* module.
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*/
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uint32_t app_gpiote_user_enable(app_gpiote_user_id_t user_id);
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/**@brief Function for informing the GPIOTE module that the specified user is done using the GPIOTE module.
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*
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* @param[in] user_id Id of user to enable.
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*
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* @retval NRF_SUCCESS On success.
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* @retval NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user.
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* @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE
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* module.
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*/
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uint32_t app_gpiote_user_disable(app_gpiote_user_id_t user_id);
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/**@brief Function for getting the state of the pins which are registered for the specified user.
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*
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* @param[in] user_id Id of user to check.
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* @param[out] p_pins Pointer to array of words with bit mask corresponding to the pins
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* configured to generate events to the specified user. All bits
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* corresponding to pins in the state 'high' will have value '1',
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* all others will have value '0'. Size of array depends on number
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* of ports in the device.
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*
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* @retval NRF_SUCCESS On success.
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* @retval NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user.
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* @retval NRF_ERROR_INALID_STATE If @ref app_gpiote_init has not been called on the GPIOTE
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* module.
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*/
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uint32_t app_gpiote_pins_state_get(app_gpiote_user_id_t user_id, uint32_t * p_pins);
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#ifdef __cplusplus
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}
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#endif
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#endif // APP_GPIOTE_H__
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/** @} */
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