Diff: nRF51822/nordic-sdk/components/libraries/gpiote/app_gpiote.h

Revision:

1:fc2f9d636751

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822/nordic-sdk/components/libraries/gpiote/app_gpiote.h	Wed Apr 22 07:47:17 2015 +0000
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+/* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
+ *
+ * The information contained herein is property of Nordic Semiconductor ASA.
+ * Terms and conditions of usage are described in detail in NORDIC
+ * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
+ *
+ * Licensees are granted free, non-transferable use of the information. NO
+ * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
+ * the file.
+ *
+ */
+
+/** @file
+ *
+ * @defgroup app_gpiote GPIOTE Handler
+ * @{
+ * @ingroup app_common
+ *
+ * @brief GPIOTE handler module.
+ *
+ * @details The GPIOTE handler allows several modules ("users") to share the GPIOTE interrupt,
+ *          each user defining a set of pins able to generate events to the user.
+ *          When a GPIOTE interrupt occurs, the GPIOTE interrupt handler will call the event handler
+ *          of each user for which at least one of the pins generated an event.
+ *
+ *          The GPIOTE users are responsible for configuring all their corresponding pins, except
+ *          the SENSE field, which should be initialized to GPIO_PIN_CNF_SENSE_Disabled.
+ *          The SENSE field will be updated by the GPIOTE module when it is enabled or disabled,
+ *          and also while it is enabled.
+ *
+ *          The module specifies on which pins events should be generated if the pin(s) goes
+ *          from low->high or high->low or both directions.
+ *
+ * @note    Even if the application is using the @ref app_scheduler, the GPIOTE event handlers will
+ *          be called directly from the GPIOTE interrupt handler.
+ *
+ * @warning If multiple users registers for the same pins the behavior for those pins are undefined.
+ */
+
+#ifndef APP_GPIOTE_H__
+#define APP_GPIOTE_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "nrf.h"
+#include "app_error.h"
+#include "app_util.h"
+
+#define GPIOTE_USER_NODE_SIZE   20          /**< Size of app_gpiote.gpiote_user_t (only for use inside APP_GPIOTE_BUF_SIZE()). */
+#define NO_OF_PINS              32          /**< Number of GPIO pins on the nRF51 chip. */
+
+/**@brief Compute number of bytes required to hold the GPIOTE data structures.
+ *
+ * @param[in]   MAX_USERS   Maximum number of GPIOTE users.
+ *
+ * @return      Required buffer size (in bytes).
+ */
+#define APP_GPIOTE_BUF_SIZE(MAX_USERS)  ((MAX_USERS) * GPIOTE_USER_NODE_SIZE)
+
+typedef uint8_t app_gpiote_user_id_t;
+
+/**@brief GPIOTE event handler type. */
+typedef void (*app_gpiote_event_handler_t)(uint32_t event_pins_low_to_high,
+                                           uint32_t event_pins_high_to_low);
+
+/**@brief GPIOTE input event handler type. */
+typedef void (*app_gpiote_input_event_handler_t)(void);
+
+/**@brief Macro for initializing the GPIOTE module.
+ *
+ * @details It will handle dimensioning and allocation of the memory buffer required by the module,
+ *          making sure that the buffer is correctly aligned.
+ *
+ * @param[in]   MAX_USERS   Maximum number of GPIOTE users.
+ *
+ * @note Since this macro allocates a buffer, it must only be called once (it is OK to call it
+ *       several times as long as it is from the same location, e.g. to do a reinitialization).
+ */
+/*lint -emacro(506, APP_GPIOTE_INIT) */ /* Suppress "Constant value Boolean */
+#define APP_GPIOTE_INIT(MAX_USERS)                                                                 \
+    do                                                                                             \
+    {                                                                                              \
+        static uint32_t app_gpiote_buf[CEIL_DIV(APP_GPIOTE_BUF_SIZE(MAX_USERS), sizeof(uint32_t))];\
+        uint32_t ERR_CODE = app_gpiote_init((MAX_USERS), app_gpiote_buf);                          \
+        APP_ERROR_CHECK(ERR_CODE);                                                                 \
+    } while (0)
+
+/**@brief Function for initializing the GPIOTE module.
+ *
+ * @note Normally initialization should be done using the APP_GPIOTE_INIT() macro, as that will
+ *       allocate the buffer needed by the GPIOTE module (including aligning the buffer correctly).
+ *
+ * @param[in]   max_users               Maximum number of GPIOTE users.
+ * @param[in]   p_buffer                Pointer to memory buffer for internal use in the app_gpiote
+ *                                      module. The size of the buffer can be computed using the
+ *                                      APP_GPIOTE_BUF_SIZE() macro. The buffer must be aligned to 
+ *                                      a 4 byte boundary.
+ *
+ * @retval      NRF_SUCCESS             Successful initialization.
+ * @retval      NRF_ERROR_INVALID_PARAM Invalid parameter (buffer not aligned to a 4 byte
+ *                                      boundary).
+ */
+uint32_t app_gpiote_init(uint8_t max_users, void * p_buffer);
+
+/**@brief Function for registering a GPIOTE user.
+ *
+ * @param[out]  p_user_id               Id for the new GPIOTE user.
+ * @param[in]   pins_low_to_high_mask   Mask defining which pins will generate events to this user 
+ *                                      when state is changed from low->high.
+ * @param[in]   pins_high_to_low_mask   Mask defining which pins will generate events to this user
+ *                                      when state is changed from high->low.
+ * @param[in]   event_handler           Pointer to function to be executed when an event occurs.
+ *
+ * @retval      NRF_SUCCESS             Successful initialization.
+ * @retval      NRF_ERROR_INVALID_PARAM Invalid parameter (buffer not aligned to a 4 byte boundary).
+ * @retval      NRF_ERROR_INALID_STATE  If @ref app_gpiote_init has not been called on the GPIOTE
+ *                                      module.
+ * @retval      NRF_ERROR_NO_MEM        Returned if the application tries to register more users
+ *                                      than defined when the GPIOTE module was initialized in
+ *                                      @ref app_gpiote_init.
+ */
+uint32_t app_gpiote_user_register(app_gpiote_user_id_t *     p_user_id,
+                                  uint32_t                   pins_low_to_high_mask,
+                                  uint32_t                   pins_high_to_low_mask,
+                                  app_gpiote_event_handler_t event_handler);
+
+/**@brief Function for informing the GPIOTE module that the specified user wants to use the GPIOTE module.
+ *
+ * @param[in]   user_id                 Id of user to enable.
+ *
+ * @retval      NRF_SUCCESS             On success.
+ * @retval      NRF_ERROR_INVALID_PARAM Invalid user_id provided, No a valid user.
+ * @retval      NRF_ERROR_INALID_STATE  If @ref app_gpiote_init has not been called on the GPIOTE
+ *                                      module.
+ */
+uint32_t app_gpiote_user_enable(app_gpiote_user_id_t user_id);
+
+/**@brief Function for informing the GPIOTE module that the specified user is done using the GPIOTE module.
+ *
+ * @param[in]   user_id                   Id of user to enable.
+ *
+ * @return      NRF_SUCCESS               On success.
+ * @retval      NRF_ERROR_INVALID_PARAM   Invalid user_id provided, No a valid user.
+ * @retval      NRF_ERROR_INALID_STATE    If @ref app_gpiote_init has not been called on the GPIOTE
+ *                                        module.
+ */
+uint32_t app_gpiote_user_disable(app_gpiote_user_id_t user_id);
+
+/**@brief Function for getting the state of the pins which are registered for the specified user.
+ *
+ * @param[in]   user_id         Id of user to check.
+ * @param[out]  p_pins          Bit mask corresponding to the pins configured to generate events to
+ *                              the specified user. All bits corresponding to pins in the state
+ *                              'high' will have value '1', all others will have value '0'.
+ *
+ * @return      NRF_SUCCESS               On success.
+ * @retval      NRF_ERROR_INVALID_PARAM   Invalid user_id provided, No a valid user.
+ * @retval      NRF_ERROR_INALID_STATE    If @ref app_gpiote_init has not been called on the GPIOTE
+ *                                        module.
+ */
+uint32_t app_gpiote_pins_state_get(app_gpiote_user_id_t user_id, uint32_t * p_pins);
+
+/**@brief Function for registering event handlers for GPIOTE IN events.
+ *
+ * @param[in] channel         GPIOTE channel [0..3].
+ * @param[in] pin             Pins associated with GPIOTE channel. Changes on following pins will generate events.
+ * @param[in] polarity        Specify operation on input that shall trigger IN event.
+ * @param[in] event_handler   Event handler invoked on the IN event in the GPIOTE interrupt.
+ *
+ * @return   NRF_SUCCESS                 On success.
+ * @retval   NRF_ERROR_INVALID_PARAM     Invalid channel or pin number.
+ * @retval   NRF_ERROR_NOT_SUPPORTED     Driver doesn't support IN events.
+ */
+uint32_t app_gpiote_input_event_handler_register(const uint8_t channel,
+                                                 const uint32_t pin,
+                                                 const uint32_t polarity,
+                                                 app_gpiote_input_event_handler_t event_handler);
+
+/**@brief Function for unregistering event handlers for GPIOTE IN events.
+ *
+ * @return   NRF_SUCCESS                 On success.
+ * @retval   NRF_ERROR_NOT_SUPPORTED     Driver doesn't support IN events.
+ */
+uint32_t app_gpiote_input_event_handler_unregister(const uint8_t channel);
+
+/**@brief Function for registering event handler invoked at the end of a GPIOTE interrupt.
+ *
+ * @param[in] event_handler    Event handler invoked at the end of the GPIOTE interrupt.
+ *
+ * @return   NRF_SUCCESS                 On success.
+ * @retval   NRF_ERROR_NOT_SUPPORTED     Driver doesn't support IN events.
+ */
+uint32_t app_gpiote_end_irq_event_handler_register(app_gpiote_input_event_handler_t event_handler);
+
+/**@brief Function for unregistering event handler invoked at the end of a GPIOTE interrupt.
+ *
+ * @return   NRF_SUCCESS                 On success.
+ * @retval   NRF_ERROR_NOT_SUPPORTED     Driver doesn't support IN events.
+ */
+uint32_t app_gpiote_end_irq_event_handler_unregister(void);
+
+/**@brief Function for enabling interrupts in the GPIOTE driver.
+ *
+ * @return   NRF_SUCCESS                 On success.
+ * @retval   NRF_ERROR_NOT_SUPPORTED     Driver doesn't support.
+ */
+uint32_t app_gpiote_enable_interrupts(void);
+
+/**@brief Function for disabling interrupts in the GPIOTE driver.
+ *
+ * @return   NRF_SUCCESS                 On success.
+ * @retval   NRF_ERROR_NOT_SUPPORTED     Driver doesn't support.
+ */
+uint32_t app_gpiote_disable_interrupts(void);
+
+
+#endif // APP_GPIOTE_H__
+
+/** @} */
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