/** * \file * * \brief SAM AC - Analog Comparator Callback Driver * * Copyright (C) 2013-2015 Atmel Corporation. All rights reserved. * * \asf_license_start * * \page License * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * 3. The name of Atmel may not be used to endorse or promote products derived * from this software without specific prior written permission. * * 4. This software may only be redistributed and used in connection with an * Atmel microcontroller product. * * THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE * EXPRESSLY AND SPECIFICALLY DISCLAIMED. IN NO EVENT SHALL ATMEL 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. * * \asf_license_stop * */ /* * Support and FAQ: visit Atmel Support */ #include "ac_callback.h" struct ac_module *_ac_instance[AC_INST_NUM]; void _ac_interrupt_handler(const uint32_t instance_index); /** * \brief Registers a callback. * * Registers a callback function which is implemented by the user. * * \note The callback must be enabled by \ref ac_enable_callback, * in order for the interrupt handler to call it when the conditions for the * callback type is met. * * \param[in] module Pointer to software instance struct * \param[in] callback_func Pointer to callback function * \param[in] callback_type Callback type given by an enum * * \retval STATUS_OK The function exited successfully */ enum status_code ac_register_callback( struct ac_module *const module, ac_callback_t callback_func, const enum ac_callback callback_type) { /* Sanity check arguments */ Assert(module); Assert(callback_func); /* Register callback function */ module->callback[callback_type] = callback_func; /* Set software flag for callback */ module->register_callback_mask |= (1 << callback_type); return STATUS_OK; } /** * \brief Unregisters a callback. * * Unregisters a callback function implemented by the user. * * \param[in] module Pointer to AC software instance struct * \param[in] callback_type Callback type given by an enum * * \retval STATUS_OK The function exited successfully */ enum status_code ac_unregister_callback( struct ac_module *const module, const enum ac_callback callback_type) { /* Sanity check arguments */ Assert(module); /* Unregister callback function */ module->callback[callback_type] = NULL; /* Clear software flag for callback */ module->register_callback_mask &= ~(1 << callback_type); return STATUS_OK; } /** * \internal ISR handler for AC */ #if (AC_INST_NUM == 1) void AC_Handler(void) { _ac_interrupt_handler(0); } #elif (AC_INST_NUM == 2) void AC_Handler(void) { _ac_interrupt_handler(0); } void AC1_Handler(void) { _ac_interrupt_handler(1); } #else # error This driver is not support more than three AC instances. #endif /** * \brief Interrupt Handler for AC module. * * Handles interrupts as they occur, it will run the callback functions * that are registered and enabled. * * \param [in] instance_index Default value 0 */ void _ac_interrupt_handler(const uint32_t instance_index) { /* Temporary variable */ uint8_t interrupt_and_callback_status_mask; /* Get device instance from the look-up table */ struct ac_module *module = _ac_instance[instance_index]; /* Read and mask interrupt flag register */ interrupt_and_callback_status_mask = _ac_instance[instance_index]->hw->INTFLAG.reg & (module->register_callback_mask & module->enable_callback_mask); /* Check if comparator channel 0 needs to be serviced */ if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP0) { /* Invoke registered and enabled callback function */ (module->callback[AC_CALLBACK_COMPARATOR_0])(module); /* Clear interrupt flag */ module->hw->INTFLAG.reg = AC_INTFLAG_COMP0; } /* Check if comparator channel 1 needs to be serviced */ if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP1) { /* Invoke registered and enabled callback function */ (module->callback[AC_CALLBACK_COMPARATOR_1])(module); /* Clear interrupt flag */ module->hw->INTFLAG.reg = AC_INTFLAG_COMP1; } /* Check if window 0 needs to be serviced */ if (interrupt_and_callback_status_mask & AC_INTFLAG_WIN0) { /* Invoke registered and enabled callback function */ (module->callback[AC_CALLBACK_WINDOW_0])(module); /* Clear interrupt flag */ module->hw->INTFLAG.reg = AC_INTFLAG_WIN0; } #if (AC_NUM_CMP > 2) /* Check if comparator channel 2 needs to be serviced */ if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP2) { /* Invoke registered and enabled callback function */ (module->callback[AC_CALLBACK_COMPARATOR_2])(module); /* Clear interrupt flag */ module->hw->INTFLAG.reg = AC_INTFLAG_COMP2; } /* Check if comparator channel 3 needs to be serviced */ if (interrupt_and_callback_status_mask & AC_INTFLAG_COMP3) { /* Invoke registered and enabled callback function */ (module->callback[AC_CALLBACK_COMPARATOR_3])(module); /* Clear interrupt flag */ module->hw->INTFLAG.reg = AC_INTFLAG_COMP3; } # if !(SAMC20) /* Check if window 1 needs to be serviced */ if (interrupt_and_callback_status_mask & AC_INTFLAG_WIN1) { /* Invoke registered and enabled callback function */ (module->callback[AC_CALLBACK_WINDOW_1])(module); /* Clear interrupt flag */ module->hw->INTFLAG.reg = AC_INTFLAG_WIN1; } # endif #endif /* (AC_NUM_CMP > 2) */ }