00001 /* ---------------------------------------------------------------------------- */ 00002 /* Atmel Microcontroller Software Support */ 00003 /* SAM Software Package License */ 00004 /* ---------------------------------------------------------------------------- */ 00005 /* Copyright (c) 2015, Atmel Corporation */ 00006 /* */ 00007 /* All rights reserved. */ 00008 /* */ 00009 /* Redistribution and use in source and binary forms, with or without */ 00010 /* modification, are permitted provided that the following condition is met: */ 00011 /* */ 00012 /* - Redistributions of source code must retain the above copyright notice, */ 00013 /* this list of conditions and the disclaimer below. */ 00014 /* */ 00015 /* Atmel's name may not be used to endorse or promote products derived from */ 00016 /* this software without specific prior written permission. */ 00017 /* */ 00018 /* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR */ 00019 /* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF */ 00020 /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE */ 00021 /* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, */ 00022 /* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */ 00023 /* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, */ 00024 /* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF */ 00025 /* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING */ 00026 /* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, */ 00027 /* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ 00028 /* ---------------------------------------------------------------------------- */ 00029 00030 /** 00031 * \file 00032 * 00033 * \par Purpose 00034 * 00035 * Configuration and handling of interrupts on PIO status changes. The API 00036 * provided here have several advantages over the traditional PIO interrupt 00037 * configuration approach: 00038 * - It is highly portable 00039 * - It automatically demultiplexes interrupts when multiples pins have been 00040 * configured on a single PIO controller 00041 * - It allows a group of pins to share the same interrupt 00042 * 00043 * However, it also has several minor drawbacks that may prevent from using it 00044 * in particular applications: 00045 * - It enables the clocks of all PIO controllers 00046 * - PIO controllers all share the same interrupt handler, which does the 00047 * demultiplexing and can be slower than direct configuration 00048 * - It reserves space for a fixed number of interrupts, which can be 00049 * increased by modifying the appropriate constant in pio_it.c. 00050 * 00051 * \par Usage 00052 * 00053 * -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts() 00054 * with the desired priority (0 ... 7). 00055 * -# Configure a status change interrupt on one or more pin(s) with 00056 * PIO_ConfigureIt(). 00057 * -# Enable & disable interrupts on pins using PIO_EnableIt() and 00058 * PIO_DisableIt(). 00059 */ 00060 00061 #ifndef _PIO_IT_ 00062 #define _PIO_IT_ 00063 00064 /* 00065 * Headers 00066 */ 00067 00068 #include "pio.h" 00069 00070 #ifdef __cplusplus 00071 extern "C" { 00072 #endif 00073 00074 /* 00075 * Global functions 00076 */ 00077 00078 extern void PIO_InitializeInterrupts(uint32_t dwPriority); 00079 00080 extern void PIO_ConfigureIt(const Pin *pPin, void (*handler)(const Pin *)); 00081 00082 extern void PIO_EnableIt(const Pin *pPin); 00083 00084 extern void PIO_DisableIt(const Pin *pPin); 00085 00086 extern void PIO_IT_InterruptHandler(void); 00087 00088 extern void PioInterruptHandler(uint32_t id, Pio *pPio); 00089 00090 extern void PIO_CaptureHandler(void); 00091 00092 #ifdef __cplusplus 00093 } 00094 #endif 00095 00096 #endif /* #ifndef _PIO_IT_ */ 00097