1 files changed, 83 insertions, 0 deletions
diff --git a/at91lib/peripherals/pio/pio_it.h b/at91lib/peripherals/pio/pio_it.h
new file mode 100644
index 0000000..0fcf7be
--- /dev/null
+++ b/at91lib/peripherals/pio/pio_it.h
@@ -0,0 +1,83 @@
+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: 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
+ * 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !!!Purpose
+/// 
+/// Configuration and handling of interrupts on PIO status changes. The API
+/// provided here have several advantages over the traditional PIO interrupt
+/// configuration approach:
+///    - It is highly portable
+///    - It automatically demultiplexes interrupts when multiples pins have been
+///      configured on a single PIO controller
+///    - It allows a group of pins to share the same interrupt
+/// 
+/// However, it also has several minor drawbacks that may prevent from using it
+/// in particular applications:
+///    - It enables the clocks of all PIO controllers
+///    - PIO controllers all share the same interrupt handler, which does the
+///      demultiplexing and can be slower than direct configuration
+///    - It reserves space for a fixed number of interrupts, which can be
+///      increased by modifying the appropriate constant in pio_it.c.
+///
+/// !!!Usage
+/// 
+/// -# Initialize the PIO interrupt mechanism using PIO_InitializeInterrupts()
+///    with the desired priority (0 ... 7).
+/// -# Configure a status change interrupt on one or more pin(s) with
+///    PIO_ConfigureIt().
+/// -# Enable & disable interrupts on pins using PIO_EnableIt() and
+///    PIO_DisableIt().
+//------------------------------------------------------------------------------
+
+#ifndef PIO_IT_H
+#define PIO_IT_H
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include "pio.h"
+
+//------------------------------------------------------------------------------
+//         Global functions
+//------------------------------------------------------------------------------
+
+extern void PIO_InitializeInterrupts(unsigned int priority);
+
+extern void PIO_ConfigureIt(const Pin *pPin, void (*handler)(const Pin *));
+
+extern void PIO_EnableIt(const Pin *pPin);
+
+extern void PIO_DisableIt(const Pin *pPin);
+
+#endif //#ifndef PIO_IT_H
+