For with fix for disconnection notifications
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Diff: nordic/app_common/app_button.c
- Revision:
- 56:a1071b629aa3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/nordic/app_common/app_button.c Tue Sep 02 15:50:05 2014 +0100 @@ -0,0 +1,284 @@ +/* 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. + * + */ + +#include "app_button.h" +#include <string.h> +#include "nordic_common.h" +#include "app_util.h" +#include "app_gpiote.h" +#include "app_timer.h" +#include "app_error.h" + + +static app_button_cfg_t * mp_buttons = NULL; /**< Button configuration. */ +static uint8_t m_button_count; /**< Number of configured buttons. */ +static uint32_t m_detection_delay; /**< Delay before a button is reported as pushed. */ +static app_button_evt_schedule_func_t m_evt_schedule_func; /**< Pointer to function for propagating button events to the scheduler. */ +static app_gpiote_user_id_t m_gpiote_user_id; /**< GPIOTE user id for buttons module. */ +static app_timer_id_t m_detection_delay_timer_id; /**< Polling timer id. */ +static pin_transition_t m_pin_transition; /**< pin transaction direction. */ + + +/**@brief Function for executing the application button handler for specified button. + * + * @param[in] p_btn Button that has been pushed. + */ +static void button_handler_execute(app_button_cfg_t * p_btn, uint32_t transition) +{ + if (m_evt_schedule_func != NULL) + { + uint32_t err_code = m_evt_schedule_func(p_btn->button_handler, p_btn->pin_no,transition); + APP_ERROR_CHECK(err_code); + } + else + { + if(transition == APP_BUTTON_PUSH) + { + p_btn->button_handler(p_btn->pin_no, APP_BUTTON_PUSH); + } + else if(transition == APP_BUTTON_RELEASE) + { + p_btn->button_handler(p_btn->pin_no, APP_BUTTON_RELEASE); + } + } +} + + +/**@brief Function for handling the timeout that delays reporting buttons as pushed. + * + * @details The detection_delay_timeout_handler(...) is a call-back issued from the app_timer + * module. It is called with the p_context parameter. The p_context parameter is + * provided to the app_timer module when a timer is started, using the call + * @ref app_timer_start. On @ref app_timer_start the p_context will be holding the + * currently pressed buttons. + * + * @param[in] p_context Pointer used for passing information app_start_timer() was called. + * In the app_button module the p_context holds information on pressed + * buttons. + */ +static void detection_delay_timeout_handler(void * p_context) +{ + uint32_t err_code; + uint32_t current_state_pins; + + // Get current state of pins. + err_code = app_gpiote_pins_state_get(m_gpiote_user_id, ¤t_state_pins); + + if (err_code != NRF_SUCCESS) + { + return; + } + + uint8_t i; + + // Pushed button(s) detected, execute button handler(s). + for (i = 0; i < m_button_count; i++) + { + app_button_cfg_t * p_btn = &mp_buttons[i]; + + if (((m_pin_transition.high_to_low & (1 << p_btn->pin_no)) != 0) && (p_btn->button_handler != NULL)) + { + //If it's active high then going from high to low was a release of the button. + if(p_btn->active_state == APP_BUTTON_ACTIVE_HIGH) + { + button_handler_execute(p_btn, APP_BUTTON_RELEASE); + } + //If it's active low then going from high to low was a push of the button. + else + { + button_handler_execute(p_btn, APP_BUTTON_PUSH); + } + } + else if (((m_pin_transition.low_to_high & (1 << p_btn->pin_no)) != 0) && (p_btn->button_handler != NULL)) + { + //If it's active high then going from low to high was a push of the button. + if(p_btn->active_state == APP_BUTTON_ACTIVE_HIGH) + { + button_handler_execute(p_btn,APP_BUTTON_PUSH); + } + //If it's active low then going from low to high was a release of the button. + else + { + button_handler_execute(p_btn,APP_BUTTON_RELEASE); + } + } + } +} + + +/**@brief Function for handling the GPIOTE event. + * + * @details Saves the current status of the button pins, and starts a timer. If the timer is already + * running, it will be restarted. + * + * @param[in] event_pins_low_to_high Mask telling which pin(s) had a low to high transition. + * @param[in] event_pins_high_to_low Mask telling which pin(s) had a high to low transition. + */ +static void gpiote_event_handler(uint32_t event_pins_low_to_high, uint32_t event_pins_high_to_low) +{ + uint32_t err_code; + + // Start detection timer. If timer is already running, the detection period is restarted. + // NOTE: Using the p_context parameter of app_timer_start() to transfer the pin states to the + // timeout handler (by casting event_pins_mask into the equally sized void * p_context + // parameter). + STATIC_ASSERT(sizeof(void *) == sizeof(uint32_t)); + + err_code = app_timer_stop(m_detection_delay_timer_id); + if (err_code != NRF_SUCCESS) + { + // The impact in app_button of the app_timer queue running full is losing a button press. + // The current implementation ensures that the system will continue working as normal. + return; + } + + m_pin_transition.low_to_high = event_pins_low_to_high; + m_pin_transition.high_to_low = event_pins_high_to_low; + + err_code = app_timer_start(m_detection_delay_timer_id, + m_detection_delay, + (void *)(event_pins_low_to_high | event_pins_high_to_low)); + if (err_code != NRF_SUCCESS) + { + // The impact in app_button of the app_timer queue running full is losing a button press. + // The current implementation ensures that the system will continue working as normal. + } +} + + +uint32_t app_button_init(app_button_cfg_t * p_buttons, + uint8_t button_count, + uint32_t detection_delay, + app_button_evt_schedule_func_t evt_schedule_func) +{ + uint32_t err_code; + + if (detection_delay < APP_TIMER_MIN_TIMEOUT_TICKS) + { + return NRF_ERROR_INVALID_PARAM; + } + + // Save configuration. + mp_buttons = p_buttons; + m_button_count = button_count; + m_detection_delay = detection_delay; + m_evt_schedule_func = evt_schedule_func; + + // Configure pins. + uint32_t pins_transition_mask = 0; + + while (button_count--) + { + app_button_cfg_t * p_btn = &p_buttons[button_count]; + + // Configure pin. + nrf_gpio_cfg_input(p_btn->pin_no, p_btn->pull_cfg); + + // Build GPIOTE user registration masks. + pins_transition_mask |= (1 << p_btn->pin_no); + } + + // Register button module as a GPIOTE user. + err_code = app_gpiote_user_register(&m_gpiote_user_id, + pins_transition_mask, + pins_transition_mask, + gpiote_event_handler); + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + // Create polling timer. + return app_timer_create(&m_detection_delay_timer_id, + APP_TIMER_MODE_SINGLE_SHOT, + detection_delay_timeout_handler); +} + + +uint32_t app_button_enable(void) +{ + if (mp_buttons == NULL) + { + return NRF_ERROR_INVALID_STATE; + } + + return app_gpiote_user_enable(m_gpiote_user_id); +} + + +uint32_t app_button_disable(void) +{ + uint32_t err_code; + + if (mp_buttons == NULL) + { + return NRF_ERROR_INVALID_STATE; + } + + err_code = app_gpiote_user_disable(m_gpiote_user_id); + + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + // Make sure polling timer is not running. + return app_timer_stop(m_detection_delay_timer_id); +} + + +uint32_t app_button_is_pushed(uint8_t pin_no, bool * p_is_pushed) +{ + uint32_t err_code; + uint32_t active_pins; + + app_button_cfg_t * p_btn = &mp_buttons[pin_no]; + + if (mp_buttons == NULL) + { + return NRF_ERROR_INVALID_STATE; + } + + err_code = app_gpiote_pins_state_get(m_gpiote_user_id, &active_pins); + + if (err_code != NRF_SUCCESS) + { + return err_code; + } + + if(p_btn->active_state == APP_BUTTON_ACTIVE_LOW) + { + // If the pin is active low, then the pin being high means it is not pushed. + if(((active_pins >> pin_no) & 0x01)) + { + *p_is_pushed = false; + } + else + { + *p_is_pushed = true; + } + } + else if(p_btn->active_state == APP_BUTTON_ACTIVE_HIGH) + { + // If the pin is active high, then the pin being high means it is pushed. + if(((active_pins >> pin_no) & 0x01)) + { + *p_is_pushed = true; + } + else + { + *p_is_pushed = false; + } + } + + return NRF_SUCCESS; +}